feat: add framework flag aliases and unified IM pagination

Introduce declarative exact-name flag aliases at the shortcut framework boundary while keeping semantic compatibility domain-owned. Add a shared, format-aware IM pagination pipeline with consistent flags, metadata, safety bounds, resumable cursors, and request throttling.

.github/CODEOWNERS

@@ -1,4 +1,7 @@
+/go.mod @liangshuo-1
+/go.sum @liangshuo-1
 /internal/ @liangshuo-1
+/shortcuts/common/ @liangshuo-1
 
 # Last match wins: existing domains below are exempt, only new skills/ entries need review.
 /skills/ @liangshuo-1

.github/workflows/semantic-review.yml

@@ -25,19 +25,16 @@ jobs:
         with:
           script: |
             const run = context.payload.workflow_run;
-            if (run.name !== "CI") throw new Error(`unexpected workflow name: ${run.name}`);
-            let workflowPath = run.path || "";
-            if (!workflowPath) {
-              const workflowId = Number(run.workflow_id || 0);
-              if (!Number.isInteger(workflowId) || workflowId <= 0) throw new Error("missing workflow id");
-              const { data: workflow } = await github.rest.actions.getWorkflow({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                workflow_id: workflowId,
-              });
-              workflowPath = workflow.path || "";
-            }
-            if (workflowPath !== ".github/workflows/ci.yml") throw new Error(`unexpected workflow path: ${workflowPath}`);
+            const workflowId = Number(run.workflow_id || 0);
+            if (!Number.isInteger(workflowId) || workflowId <= 0) throw new Error("missing workflow id");
+            const { data: workflow } = await github.rest.actions.getWorkflow({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              workflow_id: workflowId,
+            });
+            if (workflow.name !== "CI") throw new Error(`unexpected workflow name: ${workflow.name}`);
+            if (workflow.path !== ".github/workflows/ci.yml") throw new Error(`unexpected workflow path: ${workflow.path}`);
+            if (run.path && run.path !== workflow.path) throw new Error(`workflow path mismatch: ${run.path}`);
             if (run.event !== "pull_request") throw new Error(`unexpected event: ${run.event}`);
             if (run.repository.id !== context.payload.repository.id) throw new Error("repository id mismatch");
             if (run.repository.full_name !== context.payload.repository.full_name) throw new Error("repository name mismatch");
@@ -253,19 +250,16 @@ jobs:
         with:
           script: |
             const run = context.payload.workflow_run;
-            if (run.name !== "CI") throw new Error(`unexpected workflow name: ${run.name}`);
-            let workflowPath = run.path || "";
-            if (!workflowPath) {
-              const workflowId = Number(run.workflow_id || 0);
-              if (!Number.isInteger(workflowId) || workflowId <= 0) throw new Error("missing workflow id");
-              const { data: workflow } = await github.rest.actions.getWorkflow({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                workflow_id: workflowId,
-              });
-              workflowPath = workflow.path || "";
-            }
-            if (workflowPath !== ".github/workflows/ci.yml") throw new Error(`unexpected workflow path: ${workflowPath}`);
+            const workflowId = Number(run.workflow_id || 0);
+            if (!Number.isInteger(workflowId) || workflowId <= 0) throw new Error("missing workflow id");
+            const { data: workflow } = await github.rest.actions.getWorkflow({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              workflow_id: workflowId,
+            });
+            if (workflow.name !== "CI") throw new Error(`unexpected workflow name: ${workflow.name}`);
+            if (workflow.path !== ".github/workflows/ci.yml") throw new Error(`unexpected workflow path: ${workflow.path}`);
+            if (run.path && run.path !== workflow.path) throw new Error(`workflow path mismatch: ${run.path}`);
             if (run.event !== "pull_request") throw new Error(`unexpected event: ${run.event}`);
             if (run.conclusion !== "success") throw new Error(`unexpected conclusion: ${run.conclusion}`);
             if (run.repository.id !== context.payload.repository.id) throw new Error("repository id mismatch");

CHANGELOG.md

@@ -2,6 +2,90 @@
 
 All notable changes to this project will be documented in this file.
 
+## [v1.0.81] - 2026-07-31
+
+### Features
+
+- support visible_rule for form questions (#1891)
+- **contact**: add bot search shortcut (#2083)
+- add SXSD schema validation to Slides lint (#2103)
+- **drive**: add comment-operation shortcuts (#1898)
+- **drive**: extend permission shortcuts for Miaoda (#2070)
+- **apps**: add cache debug commands (+cache-get/-delete/-clear) (#1896)
+- support source file preview artifacts (#2085)
+
+### Bug Fixes
+
+- **contact**: stop bot match segments carrying tags or empty entries (#2115)
+- **base**: resolve Base URL block types accurately (#2099)
+- **drive**: use title for default download filename (#2089)
+- drop stale target version from root upgrade prompt (#2100)
+
+### Documentation
+
+- **calendar**: warn against container-default timezone in time conversion (#2104)
+- **calendar**: confirm scope before editing recurring events (#2119)
+- **base**: clarify form and file operation routing (#2110)
+
+### Misc
+
+- add protected public domain allowlists (#2111)
+
+## [v1.0.80] - 2026-07-29
+
+### Features
+
+- **drive**: add +member-list shortcut (#1795)
+- **drive**: add +permission-get-setting shortcut (#1738)
+- propagate invocation metadata (#2097)
+
+### Documentation
+
+- **slides**: 补齐 shortcut 参数说明，修正 +xml-get --output 必填标注 (#2088)
+- **slides**: +create 的参数下沉到 create.md，主 skill 只留路由 (#2096)
+
+### Tests
+
+- **e2e**: wait for base role update visibility (#2087)
+
+### Misc
+
+- Feat/detect line text overlap (#2069)
+
+## [v1.0.79] - 2026-07-28
+
+### Features
+
+- **slides**: update xsd (#2067)
+
+### Bug Fixes
+
+- **ci**: validate static workflow identity (#2015)
+- **sheets**: recognize OFL0X local office tokens (#2063)
+
+### Documentation
+
+- **calendar**: clarify identity selection by event ownership (#2071)
+- **slides**: add formula inline element syntax to quick-ref (#2077)
+
+## [v1.0.78] - 2026-07-27
+
+### Features
+
+- event description support rich text (#1975)
+
+### Bug Fixes
+
+- **slides**: restrict canvas overflow checks
+- **slides**: upgrade text overflow to error above 10px threshold
+- **slides**: detect letterSpacing-driven text overflow
+- **slides**: downgrade background-decoration text overflow to info
+- **slides**: allow chartParsedValues roundtrip tag
+- refine character width estimation for lark-slides text lint
+- **slides**: preserve info lint severity
+- **slides**: text may over flow shape
+- exempt ghost text from slides lint
+
 ## [v1.0.77] - 2026-07-24
 
 ### Features
@@ -1667,6 +1751,10 @@ Bundled AI agent skills for intelligent assistance:
 - Bilingual documentation (English & Chinese).
 - CI/CD pipelines: linting, testing, coverage reporting, and automated releases.
 
+[v1.0.81]: https://github.com/larksuite/cli/releases/tag/v1.0.81
+[v1.0.80]: https://github.com/larksuite/cli/releases/tag/v1.0.80
+[v1.0.79]: https://github.com/larksuite/cli/releases/tag/v1.0.79
+[v1.0.78]: https://github.com/larksuite/cli/releases/tag/v1.0.78
 [v1.0.77]: https://github.com/larksuite/cli/releases/tag/v1.0.77
 [v1.0.75]: https://github.com/larksuite/cli/releases/tag/v1.0.75
 [v1.0.74]: https://github.com/larksuite/cli/releases/tag/v1.0.74

README.md

@@ -310,10 +310,6 @@ lark-cli config risk-control default
 
 Please fully understand all usage risks. By using this tool, you are deemed to voluntarily assume all related responsibilities.
 
-## Star History
-
-[![Star History Chart](https://api.star-history.com/svg?repos=larksuite/cli&type=Date)](https://star-history.com/#larksuite/cli&Date)
-
 ## Contributing
 
 Community contributions are welcome! If you find a bug or have feature suggestions, please submit an [Issue](https://github.com/larksuite/cli/issues) or [Pull Request](https://github.com/larksuite/cli/pulls).

README.zh.md

@@ -311,10 +311,6 @@ lark-cli config risk-control default
 
 请您充分知悉全部使用风险，使用本工具即视为您自愿承担相关所有责任。
 
-## Star History
-
-[![Star History Chart](https://api.star-history.com/svg?repos=larksuite/cli&type=Date)](https://star-history.com/#larksuite/cli&Date)
-
 ## 贡献
 
 欢迎社区贡献！如果你发现 bug 或有功能建议，请提交 [Issue](https://github.com/larksuite/cli/issues) 或 [Pull Request](https://github.com/larksuite/cli/pulls)。

affordance/contact.md

@@ -23,6 +23,41 @@ lark-cli contact +search-user --query "alice" --as user
 lark-cli contact +search-user --user-ids "ou_3a8b****6a7b,me" --as user
 ```
 
+## +search-bot
+Search bots (apps) by keyword. Pass `--query` or `--queries`; use `--chat-ids` to search within specific chats.
+
+### Skills
+- lark-contact/references/lark-contact-search-bot.md
+
+### Avoid when
+- Looking for a person rather than a bot → use [[+search-user]]
+- Running as a bot — this shortcut is user-only
+
+### Tips
+- `has_more=true` means the search is incomplete; refine the keyword or search scope instead of paginating
+
+### Examples
+
+**Find bots by keyword**
+```bash
+lark-cli contact +search-bot --query "会议助手" --as user
+```
+
+**Search inside one chat**
+```bash
+lark-cli contact +search-bot --query "助手" --chat-ids "oc_3a8b****6a7b" --as user
+```
+
+**Find bots you've chatted with**
+```bash
+lark-cli contact +search-bot --query "助手" --has-chatted --as user
+```
+
+**Search several bot keywords in one call**
+```bash
+lark-cli contact +search-bot --queries "会议助手,日报助手,审批助手" --as user
+```
+
 ## +get-user
 Fetch one user's profile by id, or your own with --user-id omitted. Use it under bot identity — `+search-user` is user-only.
 

cmd/auth/auth_test.go

@@ -386,7 +386,7 @@ func TestAuthScopesRun_UsesTenantAccessTokenFromCredentialProvider(t *testing.T)
 		AppID: "test-app", AppSecret: "", Brand: core.BrandFeishu,
 	})
 	tokenResolver := &authScopesTokenResolver{}
-	f.Credential = newAuthTestCredentialProvider("test-app", tokenResolver)
+	f.Credential = credential.NewCredentialProvider(nil, nil, tokenResolver, nil)
 
 	appInfoStub := &httpmock.Stub{
 		Method: http.MethodGet,
@@ -442,7 +442,7 @@ func TestAuthScopesRun_LarkPermissionError_TypedAsPermissionError(t *testing.T)
 		AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu,
 	})
 	tokenResolver := &authScopesTokenResolver{}
-	f.Credential = newAuthTestCredentialProvider("test-app", tokenResolver)
+	f.Credential = credential.NewCredentialProvider(nil, nil, tokenResolver, nil)
 
 	reg.Register(&httpmock.Stub{
 		Method: http.MethodGet,
@@ -485,18 +485,6 @@ type authScopesTokenResolver struct {
 	requests []credential.TokenSpec
 }
 
-type authTestAccountResolver struct {
-	appID string
-}
-
-func (r authTestAccountResolver) ResolveAccount(context.Context) (*credential.Account, error) {
-	return &credential.Account{AppID: r.appID, Brand: core.BrandFeishu}, nil
-}
-
-func newAuthTestCredentialProvider(appID string, tokenResolver credential.DefaultTokenResolver) *credential.CredentialProvider {
-	return credential.NewCredentialProvider(nil, authTestAccountResolver{appID: appID}, tokenResolver, nil)
-}
-
 func (r *authScopesTokenResolver) ResolveToken(ctx context.Context, req credential.TokenSpec) (*credential.TokenResult, error) {
 	r.requests = append(r.requests, req)
 	switch req.Type {

cmd/auth/status.go

@@ -27,9 +27,6 @@ func NewCmdAuthStatus(f *cmdutil.Factory, runF func(*StatusOptions) error) *cobr
 	cmd := &cobra.Command{
 		Use:   "status",
 		Short: "View current auth status",
-		Long: `Show OAuth user login, token validity, and granted scopes.
-For token-validity checks, run lark-cli auth status --json --verify.
-This is not profile/app selection diagnostics; use lark-cli whoami for the effective app/profile identity used by an invocation.`,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			if runF != nil {
 				return runF(opts)

cmd/auth/status_test.go

@@ -4,35 +4,15 @@
 package auth
 
 import (
-	"context"
 	"encoding/json"
 	"net/http"
-	"strings"
 	"testing"
 
-	extcred "github.com/larksuite/cli/extension/credential"
-	envprovider "github.com/larksuite/cli/extension/credential/env"
 	"github.com/larksuite/cli/internal/cmdutil"
 	"github.com/larksuite/cli/internal/core"
-	"github.com/larksuite/cli/internal/credential"
-	"github.com/larksuite/cli/internal/envvars"
 	"github.com/larksuite/cli/internal/httpmock"
 )
 
-func TestAuthStatusHelpDistinguishesFromWhoami(t *testing.T) {
-	cmd := NewCmdAuthStatus(nil, nil)
-	for _, want := range []string{
-		"OAuth user login",
-		"auth status --json --verify",
-		"not profile/app selection diagnostics",
-		"lark-cli whoami",
-	} {
-		if !strings.Contains(cmd.Long, want) {
-			t.Errorf("auth status --help Long missing %q; got:\n%s", want, cmd.Long)
-		}
-	}
-}
-
 func TestAuthStatusRun_SplitsBotAndUserIdentity(t *testing.T) {
 	f, stdout, _, _ := cmdutil.TestFactory(t, &core.CliConfig{
 		AppID: "test-app", AppSecret: "secret", Brand: core.BrandFeishu,
@@ -99,51 +79,6 @@ func TestAuthStatusRun_VerifyReportsBotIdentity(t *testing.T) {
 	}
 }
 
-type fixedStatusAccountResolver struct {
-	account *credential.Account
-}
-
-func (r *fixedStatusAccountResolver) ResolveAccount(context.Context) (*credential.Account, error) {
-	return r.account, nil
-}
-
-func TestAuthStatus_AllowsMatchingAppIDOnlySelectedProfile(t *testing.T) {
-	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
-	t.Setenv(envvars.CliAppID, "cli_a")
-	t.Setenv(envvars.CliAppSecret, "")
-	t.Setenv(envvars.CliUserAccessToken, "")
-	t.Setenv(envvars.CliTenantAccessToken, "")
-	if err := core.SaveMultiAppConfig(&core.MultiAppConfig{
-		CurrentApp: "tenant_a",
-		Apps: []core.AppConfig{{
-			Name:      "tenant_a",
-			AppId:     "cli_a",
-			AppSecret: core.PlainSecret("test-secret"),
-			Brand:     core.BrandFeishu,
-		}},
-	}); err != nil {
-		t.Fatalf("SaveMultiAppConfig: %v", err)
-	}
-
-	config := &core.CliConfig{ProfileName: "tenant_a", AppID: "cli_a", AppSecret: "test-secret", Brand: core.BrandFeishu}
-	f, stdout, _, _ := cmdutil.TestFactory(t, config)
-	f.Credential = credential.NewCredentialProvider(
-		[]extcred.Provider{&envprovider.Provider{}},
-		&fixedStatusAccountResolver{account: credential.AccountFromCliConfig(config)},
-		nil,
-		nil,
-	).WithProfileFromFlag("tenant_a")
-
-	cmd := NewCmdAuth(f)
-	cmd.SetArgs([]string{"status", "--json"})
-	if err := cmd.Execute(); err != nil {
-		t.Fatalf("auth status should use the selected built-in profile: %v", err)
-	}
-	if strings.Contains(stdout.String(), "credentials are provided externally") {
-		t.Fatalf("matching APP_ID-only env was misclassified as external:\n%s", stdout.String())
-	}
-}
-
 type statusOutput struct {
 	Identity   string `json:"identity"`
 	Verified   *bool  `json:"verified"`

cmd/bootstrap.go

@@ -6,10 +6,8 @@ package cmd
 import (
 	"errors"
 	"io"
-	"os"
 
 	"github.com/larksuite/cli/internal/cmdutil"
-	"github.com/larksuite/cli/internal/envvars"
 	"github.com/spf13/pflag"
 )
 
@@ -28,13 +26,5 @@ func BootstrapInvocationContext(args []string) (cmdutil.InvocationContext, error
 	if err := fs.Parse(args); err != nil && !errors.Is(err, pflag.ErrHelp) {
 		return cmdutil.InvocationContext{}, err
 	}
-
-	profileFromFlag := fs.Changed("profile")
-	if !profileFromFlag {
-		globals.Profile = os.Getenv(envvars.CliProfile)
-	}
-	return cmdutil.InvocationContext{
-		Profile:         globals.Profile,
-		ProfileFromFlag: profileFromFlag,
-	}, nil
+	return cmdutil.InvocationContext{Profile: globals.Profile}, nil
 }

cmd/bootstrap_test.go

@@ -3,11 +3,7 @@
 
 package cmd
 
-import (
-	"testing"
-
-	"github.com/larksuite/cli/internal/envvars"
-)
+import "testing"
 
 func TestBootstrapInvocationContext_ProfileFlag(t *testing.T) {
 	inv, err := BootstrapInvocationContext([]string{"--profile", "target", "auth", "status"})
@@ -74,58 +70,3 @@ func TestBootstrapInvocationContext_HelpWithProfile(t *testing.T) {
 		t.Fatalf("profile = %q, want %q", inv.Profile, "target")
 	}
 }
-
-func TestBootstrapProfileEnvFallback(t *testing.T) {
-	t.Run("flag wins over env", func(t *testing.T) {
-		t.Setenv(envvars.CliProfile, "tenant_env")
-		inv, err := BootstrapInvocationContext([]string{"--profile", "tenant_flag", "whoami"})
-		if err != nil {
-			t.Fatalf("unexpected err: %v", err)
-		}
-		if inv.Profile != "tenant_flag" {
-			t.Errorf("got %q, want tenant_flag", inv.Profile)
-		}
-		if !inv.ProfileFromFlag {
-			t.Errorf("ProfileFromFlag = false, want true")
-		}
-	})
-	t.Run("explicit empty flag clears env selection", func(t *testing.T) {
-		t.Setenv(envvars.CliProfile, "tenant_env")
-		inv, err := BootstrapInvocationContext([]string{"--profile=", "whoami"})
-		if err != nil {
-			t.Fatalf("unexpected err: %v", err)
-		}
-		if inv.Profile != "" {
-			t.Errorf("got %q, want empty", inv.Profile)
-		}
-		if !inv.ProfileFromFlag {
-			t.Errorf("ProfileFromFlag = false, want true")
-		}
-	})
-	t.Run("env used when flag absent", func(t *testing.T) {
-		t.Setenv(envvars.CliProfile, "tenant_env")
-		inv, err := BootstrapInvocationContext([]string{"whoami"})
-		if err != nil {
-			t.Fatalf("unexpected err: %v", err)
-		}
-		if inv.Profile != "tenant_env" {
-			t.Errorf("got %q, want tenant_env", inv.Profile)
-		}
-		if inv.ProfileFromFlag {
-			t.Errorf("ProfileFromFlag = true, want false")
-		}
-	})
-	t.Run("empty when neither set", func(t *testing.T) {
-		t.Setenv(envvars.CliProfile, "")
-		inv, err := BootstrapInvocationContext([]string{"whoami"})
-		if err != nil {
-			t.Fatalf("unexpected err: %v", err)
-		}
-		if inv.Profile != "" {
-			t.Errorf("got %q, want empty", inv.Profile)
-		}
-		if inv.ProfileFromFlag {
-			t.Errorf("ProfileFromFlag = true, want false")
-		}
-	})
-}

cmd/config/config_test.go

@@ -84,16 +84,6 @@ func TestConfigShowCmd_FlagParsing(t *testing.T) {
 	}
 }
 
-func TestConfigShowHelpClarifiesSavedConfig(t *testing.T) {
-	cmd := NewCmdConfigShow(nil, nil)
-	if !strings.Contains(cmd.Short, "saved config") {
-		t.Errorf("config show short = %q, want saved config", cmd.Short)
-	}
-	if !strings.Contains(cmd.Long, "lark-cli whoami --json") {
-		t.Errorf("config show help missing whoami route")
-	}
-}
-
 func TestConfigShowRun_NotConfiguredReturnsStructuredError(t *testing.T) {
 	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
 
@@ -116,77 +106,6 @@ func TestConfigShowRun_NotConfiguredReturnsStructuredError(t *testing.T) {
 	}
 }
 
-// config show promises "saved config, not current usage" (help + skill
-// routing): the session profile (--profile / LARKSUITE_CLI_PROFILE) must not
-// change what it shows.
-func TestConfigShowRun_IgnoresSessionProfile(t *testing.T) {
-	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
-	multi := &core.MultiAppConfig{
-		CurrentApp: "tenant_a",
-		Apps: []core.AppConfig{
-			{Name: "tenant_a", AppId: "cli_a", AppSecret: core.PlainSecret("your-secret-a"), Brand: core.BrandFeishu},
-			{Name: "tenant_b", AppId: "cli_b", AppSecret: core.PlainSecret("your-secret-b"), Brand: core.BrandFeishu},
-		},
-	}
-	if err := core.SaveMultiAppConfig(multi); err != nil {
-		t.Fatalf("SaveMultiAppConfig: %v", err)
-	}
-
-	f, stdout, _, _ := cmdutil.TestFactory(t, nil)
-	f.Invocation.Profile = "tenant_b" // session selection must not leak in
-
-	if err := configShowRun(&ConfigShowOptions{Factory: f}); err != nil {
-		t.Fatalf("configShowRun: %v", err)
-	}
-	out := stdout.String()
-	if !strings.Contains(out, `"cli_a"`) || !strings.Contains(out, `"tenant_a"`) {
-		t.Fatalf("output = %s, want the saved default tenant_a/cli_a", out)
-	}
-	if strings.Contains(out, `"cli_b"`) {
-		t.Fatalf("output = %s, session profile tenant_b must not change saved-config view", out)
-	}
-}
-
-// engagedEnvStub simulates a fully engaged external credential provider.
-type engagedEnvStub struct{}
-
-func (engagedEnvStub) Name() string  { return "env" }
-func (engagedEnvStub) Priority() int { return 10 }
-func (engagedEnvStub) ResolveAccount(context.Context) (*extcred.Account, error) {
-	return &extcred.Account{AppID: "cli_env", AppSecret: "your-password"}, nil // managed takeover
-}
-func (engagedEnvStub) ResolveToken(context.Context, extcred.TokenSpec) (*extcred.Token, error) {
-	return nil, nil
-}
-
-// config show inspects the SAVED config only, so the parent command's
-// external-credential gate must not apply: even with a fully engaged direct
-// env credential, `config show` still answers from the saved config.
-func TestConfigShow_BypassesExternalCredentialGate(t *testing.T) {
-	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
-	multi := &core.MultiAppConfig{
-		CurrentApp: "tenant_a",
-		Apps: []core.AppConfig{{
-			Name: "tenant_a", AppId: "cli_a", AppSecret: core.PlainSecret("your-secret-a"), Brand: core.BrandFeishu,
-		}},
-	}
-	if err := core.SaveMultiAppConfig(multi); err != nil {
-		t.Fatalf("SaveMultiAppConfig: %v", err)
-	}
-
-	f, stdout, _, _ := cmdutil.TestFactory(t, nil)
-	f.Credential = credential.NewCredentialProvider([]extcred.Provider{engagedEnvStub{}}, nil, nil, nil)
-
-	cmd := NewCmdConfig(f)
-	cmd.SetArgs([]string{"show"})
-	if err := cmd.Execute(); err != nil {
-		t.Fatalf("config show must bypass the external-credential gate: %v", err)
-	}
-	if out := stdout.String(); !strings.Contains(out, `"cli_a"`) {
-		t.Fatalf("output = %s, want the saved config shown", out)
-	}
-}
-
 func TestConfigShowRun_NoActiveProfileReturnsStructuredError(t *testing.T) {
 	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
 	multi := &core.MultiAppConfig{
@@ -562,8 +481,7 @@ func TestConfigBlockedByExternalProvider(t *testing.T) {
 	}{
 		{"init", []string{"init", "--app-id", "x", "--app-secret-stdin"}},
 		{"remove", []string{"remove"}},
-		// "show" is deliberately absent: it inspects the SAVED config only
-		// and bypasses this gate (TestConfigShow_BypassesExternalCredentialGate).
+		{"show", []string{"show"}},
 		{"default-as", []string{"default-as", "user"}},
 		{"strict-mode", []string{"strict-mode", "off"}},
 	}

cmd/config/init_interactive.go

@@ -179,8 +179,8 @@ func runCreateAppFlow(ctx context.Context, f *cmdutil.Factory, brandOverride cor
 	}
 
 	// Step 1: Request app registration (begin)
-	// Use the shared proxy-plugin-aware transport so registration traffic is not
-	// a bypass of proxy plugin mode.
+	// Registration is platform traffic, so it must use the provider-aware
+	// transport as well as the shared proxy configuration.
 	httpClient := transport.NewHTTPClient(0)
 	authResp, err := larkauth.RequestAppRegistration(ctx, httpClient, larkBrand, f.IOStreams.ErrOut)
 	if err != nil {

cmd/config/show.go

@@ -27,16 +27,7 @@ func NewCmdConfigShow(f *cmdutil.Factory, runF func(*ConfigShowOptions) error) *
 
 	cmd := &cobra.Command{
 		Use:   "show",
-		Short: "Show saved config",
-		Long:  "Shows saved config. To see the app/profile lark-cli is using now, run `lark-cli whoami --json`.",
-		// Override parent's RequireBuiltinCredentialProvider check: this
-		// command reads the SAVED config only (its own help promises "saved
-		// config, not current usage"), so the currently effective credential
-		// source — external or otherwise — must not gate it.
-		PersistentPreRunE: func(c *cobra.Command, _ []string) error {
-			c.SilenceUsage = true
-			return nil
-		},
+		Short: "Show current configuration",
 		RunE: func(cmd *cobra.Command, args []string) error {
 			if runF != nil {
 				return runF(opts)
@@ -62,10 +53,7 @@ func configShowRun(opts *ConfigShowOptions) error {
 	if config == nil || len(config.Apps) == 0 {
 		return core.NotConfiguredError()
 	}
-	// Saved config only: the session profile (--profile / LARKSUITE_CLI_PROFILE)
-	// must not change what this command shows — the help and skill routing
-	// promise "saved config, not current usage" (use whoami for that).
-	app := config.CurrentAppConfig("")
+	app := config.CurrentAppConfig(f.Invocation.Profile)
 	if app == nil {
 		return errs.NewConfigError(errs.SubtypeNotConfigured, "no active profile").WithHint("run: lark-cli profile list")
 	}

cmd/doctor/doctor.go

@@ -157,8 +157,8 @@ func networkChecks(ctx context.Context, opts *DoctorOptions, ep core.Endpoints)
 		}
 	}
 
-	// Use the shared proxy-plugin-aware transport so connectivity checks reflect
-	// the real egress path (and are blocked when proxy plugin fails closed).
+	// Connectivity checks are platform traffic and must exercise the same
+	// provider-aware route as real platform requests.
 	httpClient := transport.NewHTTPClient(0)
 	mcpURL := ep.MCP + "/mcp"
 

cmd/event/consume_test.go

@@ -110,20 +110,8 @@ func (failingTokenResolver) ResolveToken(_ context.Context, _ credential.TokenSp
 	return nil, errors.New("backend unavailable")
 }
 
-type eventTestAccountResolver struct {
-	appID string
-}
-
-func (r eventTestAccountResolver) ResolveAccount(context.Context) (*credential.Account, error) {
-	return &credential.Account{AppID: r.appID}, nil
-}
-
-func newEventTestCredentialProvider(appID string, tokenResolver credential.DefaultTokenResolver) *credential.CredentialProvider {
-	return credential.NewCredentialProvider(nil, eventTestAccountResolver{appID: appID}, tokenResolver, nil)
-}
-
 func factoryWithResolver(r credential.DefaultTokenResolver) *cmdutil.Factory {
-	return &cmdutil.Factory{Credential: newEventTestCredentialProvider("cli_x", r)}
+	return &cmdutil.Factory{Credential: credential.NewCredentialProvider(nil, nil, r, nil)}
 }
 
 func TestResolveTenantToken_EmptyTokenResult(t *testing.T) {

cmd/event/runtime_test.go

@@ -44,7 +44,7 @@ func newTestConsumeRuntime(rt http.RoundTripper) *consumeRuntime {
 		client: &client.APIClient{
 			SDK:        sdk,
 			ErrOut:     io.Discard,
-			Credential: newEventTestCredentialProvider("test-app", &staticTokenResolver{}),
+			Credential: credential.NewCredentialProvider(nil, nil, &staticTokenResolver{}, nil),
 			Config:     &core.CliConfig{AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu},
 		},
 		accessIdentity: core.AsBot,

cmd/profile/list.go

@@ -17,14 +17,11 @@ import (
 )
 
 // profileListItem is the JSON output for a single profile entry.
-// `default` (formerly `active`, renamed in this feature as a declared
-// breaking change) marks the saved default profile — never the identity
-// effective for the current invocation; that is whoami's job.
 type profileListItem struct {
 	Name        string         `json:"name"`
 	AppID       string         `json:"appId"`
 	Brand       core.LarkBrand `json:"brand"`
-	Default     bool           `json:"default"`
+	Active      bool           `json:"active"`
 	User        string         `json:"user,omitempty"`
 	TokenStatus string         `json:"tokenStatus,omitempty"`
 }
@@ -33,8 +30,7 @@ type profileListItem struct {
 func NewCmdProfileList(f *cmdutil.Factory) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "list",
-		Short: "List saved profiles",
-		Long:  "Lists saved profiles. To see the app/profile lark-cli is using now, run `lark-cli whoami --json`.",
+		Short: "List all profiles",
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return profileListRun(f)
 		},
@@ -57,7 +53,7 @@ func profileListRun(f *cmdutil.Factory) error {
 		return nil
 	}
 
-	// Intentionally uses "" to show the saved default profile, not the ephemeral --profile override.
+	// Intentionally uses "" to show the persistent active profile, not the ephemeral --profile override.
 	currentApp := multi.CurrentAppConfig("")
 	currentName := ""
 	if currentApp != nil {
@@ -70,10 +66,10 @@ func profileListRun(f *cmdutil.Factory) error {
 		name := app.ProfileName()
 
 		item := profileListItem{
-			Name:    name,
-			AppID:   app.AppId,
-			Brand:   app.Brand,
-			Default: name == currentName,
+			Name:   name,
+			AppID:  app.AppId,
+			Brand:  app.Brand,
+			Active: name == currentName,
 		}
 
 		if len(app.Users) > 0 {

cmd/profile/profile.go

@@ -14,17 +14,6 @@ func NewCmdProfile(f *cmdutil.Factory) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "profile",
 		Short: "Manage configuration profiles",
-		Long: `Profiles are named app identities managed by lark-cli.
-
-Identity diagnostics and profile selection:
-  lark-cli whoami --json       Show the app/profile lark-cli is using now.
-  lark-cli auth status --json --verify  Verify OAuth login and token state.
-  --profile <name>             Use a profile for this command only.
-  LARKSUITE_CLI_PROFILE        Use a profile for the current shell / agent session.
-  config show / profile list   Inspect saved config, not current usage.
-  unset LARKSUITE_CLI_PROFILE  Clear the session profile and fall back to direct app env or configured default.
-
-A selected profile takes precedence over matching direct env credentials and tokens.`,
 	}
 	cmdutil.DisableAuthCheck(cmd)
 	cmdutil.SetTips(cmd, []string{

cmd/profile/profile_test.go

@@ -306,24 +306,14 @@ func TestProfileListRun_OutputsProfiles(t *testing.T) {
 	if err := json.Unmarshal(stdout.Bytes(), &got); err != nil {
 		t.Fatalf("Unmarshal() error = %v; output=%s", err, stdout.String())
 	}
-	raw := stdout.String()
-	// `active` is renamed to `default` as a declared breaking change: keeping
-	// a permanently mirrored alias would keep misleading agents into reading
-	// it as the currently effective identity (whoami's job).
-	if strings.Contains(raw, `"active"`) {
-		t.Fatalf("profile list output contains renamed active field: %s", raw)
-	}
-	if !strings.Contains(raw, `"default"`) {
-		t.Fatalf("profile list output missing default field: %s", raw)
-	}
 	if len(got) != 2 {
 		t.Fatalf("len(got) = %d, want 2", len(got))
 	}
-	if got[0].Name != "default" || !got[0].Default {
-		t.Fatalf("got[0] = %#v, want configured default profile", got[0])
+	if got[0].Name != "default" || !got[0].Active {
+		t.Fatalf("got[0] = %#v, want active default profile", got[0])
 	}
-	if got[1].Name != "target" || got[1].Default {
-		t.Fatalf("got[1] = %#v, want non-default target profile", got[1])
+	if got[1].Name != "target" || got[1].Active {
+		t.Fatalf("got[1] = %#v, want inactive target profile", got[1])
 	}
 }
 
@@ -637,39 +627,6 @@ func TestProfileRemoveRun_ValidationErrors(t *testing.T) {
 	})
 }
 
-// TestProfileHelpHasSelectionSection asserts `profile --help` documents the
-// per-invocation flag and session-scoped env var for selecting a profile, so
-// users and AI agents can find LARKSUITE_CLI_PROFILE without reading source.
-func TestProfileHelpHasSelectionSection(t *testing.T) {
-	cmd := NewCmdProfile(nil)
-	if !strings.Contains(cmd.Long, "Identity diagnostics and profile selection:") {
-		t.Errorf("profile --help missing identity diagnostics and profile selection section")
-	}
-	if !strings.Contains(cmd.Long, "LARKSUITE_CLI_PROFILE") {
-		t.Errorf("profile --help missing LARKSUITE_CLI_PROFILE")
-	}
-	if !strings.Contains(cmd.Long, "lark-cli whoami --json") {
-		t.Errorf("profile --help missing whoami identity route")
-	}
-	if !strings.Contains(cmd.Long, "config show / profile list") {
-		t.Errorf("profile --help missing saved-config boundary")
-	}
-	const precedence = "A selected profile takes precedence over matching direct env credentials and tokens."
-	if !strings.Contains(cmd.Long, precedence) {
-		t.Errorf("profile --help missing precedence statement %q", precedence)
-	}
-}
-
-func TestProfileListHelpClarifiesSavedProfiles(t *testing.T) {
-	cmd := NewCmdProfileList(nil)
-	if !strings.Contains(cmd.Short, "saved profiles") {
-		t.Errorf("profile list short = %q, want saved profiles", cmd.Short)
-	}
-	if !strings.Contains(cmd.Long, "lark-cli whoami --json") {
-		t.Errorf("profile list help missing whoami route")
-	}
-}
-
 func TestProfileListRun_InvalidConfigReturnsValidationError(t *testing.T) {
 	dir := setupProfileConfigDir(t)
 	if err := os.WriteFile(filepath.Join(dir, "config.json"), []byte("{invalid json"), 0600); err != nil {

cmd/root_upgrade.go

@@ -65,7 +65,17 @@ func offerRootUpgrade(f *cmdutil.Factory, cmd *cobra.Command) {
 	if info == nil {
 		return
 	}
-	fmt.Fprintf(ios.ErrOut, "lark-cli %s available (current %s). Upgrade now? [y/N]: ", info.Latest, info.Current)
+	// Deliberately no target version here: info.Latest comes from the on-disk
+	// cache, which has no expiry (the 24h TTL only throttles refreshes, and a
+	// failed refresh leaves the old value in place), so it can name a version
+	// that is no longer the one npm would install. The version actually
+	// installed is resolved live by the update subcommand, which prints
+	// "Updating lark-cli <cur> -> <latest> via <pm> ..." before installing —
+	// that is where the user sees the real target. Keep going through the
+	// update subcommand rather than calling RunNpmInstall directly, otherwise
+	// that line disappears and the user approves a global install without ever
+	// being told what gets installed.
+	fmt.Fprintf(ios.ErrOut, "A newer lark-cli is available (current %s). Upgrade now? [y/N]: ", info.Current)
 	if !readYes(ios.In) {
 		return
 	}

cmd/root_upgrade_test.go

@@ -128,6 +128,17 @@ func TestOfferRootUpgrade(t *testing.T) {
 			if gotPrompt != tc.wantPrompt {
 				t.Errorf("prompt: got %v want %v (stderr=%q)", gotPrompt, tc.wantPrompt, errBuf.String())
 			}
+			// The prompt must not name a target version: info.Latest comes from
+			// the on-disk cache and can be stale, while the version actually
+			// installed is resolved live by the update subcommand.
+			if tc.wantPrompt {
+				if strings.Contains(errBuf.String(), tc.latest) {
+					t.Errorf("prompt must not name the cached target version %q (stderr=%q)", tc.latest, errBuf.String())
+				}
+				if !strings.Contains(errBuf.String(), build.Version) {
+					t.Errorf("prompt must name the current version %q (stderr=%q)", build.Version, errBuf.String())
+				}
+			}
 			if called != tc.wantRun {
 				t.Errorf("runRootUpgrade called: got %v want %v", called, tc.wantRun)
 			}

cmd/whoami/whoami.go

@@ -10,7 +10,6 @@ import (
 
 	"github.com/larksuite/cli/internal/cmdutil"
 	"github.com/larksuite/cli/internal/core"
-	"github.com/larksuite/cli/internal/credential"
 	"github.com/larksuite/cli/internal/identitydiag"
 	"github.com/larksuite/cli/internal/output"
 )
@@ -34,15 +33,6 @@ type whoamiResult struct {
 	TokenStatus    string         `json:"tokenStatus"`
 	OnBehalfOf     *delegatedUser `json:"onBehalfOf,omitempty"`
 	Hint           string         `json:"hint,omitempty"`
-
-	// CredentialSource, Explicit, and DirectCredentialEnv surface the cached
-	// credential.IdentitySelection computed during resolution (not re-inferred
-	// here). On the non-env extension-provider path CredentialSource is
-	// "extension:<provider>" (e.g. "extension:sidecar"); an empty value only
-	// means the selection was never resolved.
-	CredentialSource    string                         `json:"credentialSource"`
-	Explicit            bool                           `json:"explicit"`
-	DirectCredentialEnv credential.DirectCredentialEnv `json:"directCredentialEnv"`
 }
 
 // delegatedUser is the user a user-identity acts on behalf of.
@@ -68,10 +58,6 @@ func NewCmdWhoami(f *cmdutil.Factory) *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "whoami",
 		Short: "Show the current effective identity, app, profile, and token status (JSON)",
-		Long: `Show the effective app identity used by this invocation. This is not OAuth login status;
-use ` + "`lark-cli auth status --json`" + ` for OAuth user/token state.
-The JSON output includes credentialSource, appId, brand, and whether direct app credential
-env is present and matches the selected profile.`,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return whoamiRun(cmd, opts)
 		},
@@ -111,17 +97,7 @@ func whoamiRun(cmd *cobra.Command, opts *Options) error {
 		f.ResolveStrictMode(ctx).ForcedIdentity(),
 	)
 	diag := identitydiag.Diagnose(ctx, f, cfg, false)
-	// Read the cached selection computed during resolution; never re-infer it
-	// here. A resolution failure (e.g. under a non-env extension provider that
-	// doesn't populate a selection) degrades to the zero value rather than
-	// regressing whoami's own error/diagnostic path above.
-	var selection credential.IdentitySelection
-	if f.Credential != nil {
-		if sel, err := f.Credential.Selection(ctx); err == nil {
-			selection = sel
-		}
-	}
-	res := buildResult(cfg, as, source, diag, selection)
+	res := buildResult(cfg, as, source, diag)
 	output.PrintJson(f.IOStreams.Out, res)
 	return nil
 }
@@ -146,23 +122,18 @@ func resolveSource(changedAs bool, flagAs core.Identity, autoDetected bool, stri
 
 // buildResult maps the resolved identity and local diagnostics into the output.
 // ResolveAs only ever returns user or bot, so the default branch handles user.
-// selection is the cached credential.IdentitySelection from resolution; it is
-// read as-is, never recomputed.
-func buildResult(cfg *core.CliConfig, as core.Identity, source string, diag identitydiag.Result, selection credential.IdentitySelection) *whoamiResult {
+func buildResult(cfg *core.CliConfig, as core.Identity, source string, diag identitydiag.Result) *whoamiResult {
 	defaultAs := cfg.DefaultAs
 	if defaultAs == "" {
 		defaultAs = core.AsAuto
 	}
 	res := &whoamiResult{
-		Profile:             cfg.ProfileName,
-		AppID:               cfg.AppID,
-		Brand:               cfg.Brand,
-		DefaultAs:           string(defaultAs),
-		Identity:            string(as),
-		IdentitySource:      source,
-		CredentialSource:    string(selection.Source),
-		Explicit:            selection.Explicit(),
-		DirectCredentialEnv: selection.DirectCredentialEnv,
+		Profile:        cfg.ProfileName,
+		AppID:          cfg.AppID,
+		Brand:          cfg.Brand,
+		DefaultAs:      string(defaultAs),
+		Identity:       string(as),
+		IdentitySource: source,
 	}
 	// Use the diagnosed hint as-is: it is tailored to the credential source, so
 	// it never says "auth login" when that is blocked under an external provider.

cmd/whoami/whoami_test.go

@@ -15,13 +15,10 @@ import (
 
 	"github.com/larksuite/cli/errs"
 	extcred "github.com/larksuite/cli/extension/credential"
-	envprovider "github.com/larksuite/cli/extension/credential/env"
 	"github.com/larksuite/cli/internal/cmdutil"
 	"github.com/larksuite/cli/internal/core"
 	"github.com/larksuite/cli/internal/credential"
-	"github.com/larksuite/cli/internal/envvars"
 	"github.com/larksuite/cli/internal/identitydiag"
-	"github.com/larksuite/cli/internal/keychain"
 )
 
 func TestResolveSource(t *testing.T) {
@@ -55,7 +52,7 @@ func TestBuildResult_UserValid(t *testing.T) {
 	diag := identitydiag.Result{
 		User: identitydiag.Identity{Available: true, Status: "ready", TokenStatus: "valid", OpenID: "ou_x", UserName: "Alice"},
 	}
-	r := buildResult(cfg, core.AsUser, "auto_detect", diag, credential.IdentitySelection{})
+	r := buildResult(cfg, core.AsUser, "auto_detect", diag)
 
 	if r.Identity != "user" || r.IdentitySource != "auto_detect" {
 		t.Fatalf("identity/source = %q/%q", r.Identity, r.IdentitySource)
@@ -80,7 +77,7 @@ func TestBuildResult_UserMissingToken(t *testing.T) {
 	diag := identitydiag.Result{
 		User: identitydiag.Identity{Available: false, Status: "missing", Hint: "run: lark-cli auth login --help"}, // never logged in
 	}
-	r := buildResult(cfg, core.AsUser, "auto_detect", diag, credential.IdentitySelection{})
+	r := buildResult(cfg, core.AsUser, "auto_detect", diag)
 
 	if r.Available {
 		t.Fatalf("available = true, want false")
@@ -103,7 +100,7 @@ func TestBuildResult_BotReady(t *testing.T) {
 	diag := identitydiag.Result{
 		Bot: identitydiag.Identity{Available: true, Status: "ready"},
 	}
-	r := buildResult(cfg, core.AsBot, "default_as", diag, credential.IdentitySelection{})
+	r := buildResult(cfg, core.AsBot, "default_as", diag)
 
 	if r.Identity != "bot" || r.IdentitySource != "default_as" {
 		t.Fatalf("identity/source = %q/%q", r.Identity, r.IdentitySource)
@@ -124,7 +121,7 @@ func TestBuildResult_BotNotConfigured(t *testing.T) {
 	diag := identitydiag.Result{
 		Bot: identitydiag.Identity{Available: false, Status: "not_configured", Hint: "run: lark-cli config --help"},
 	}
-	r := buildResult(cfg, core.AsBot, "auto_detect", diag, credential.IdentitySelection{})
+	r := buildResult(cfg, core.AsBot, "auto_detect", diag)
 
 	if r.Available {
 		t.Fatalf("available = true, want false")
@@ -321,94 +318,3 @@ func TestWhoami_ExternalProvider_UserHintNotKeychain(t *testing.T) {
 		t.Fatalf("hint should explain external management: %q", got.Hint)
 	}
 }
-
-// noopWhoamiKeychain is a no-op KeychainAccess; the profile below uses a
-// plaintext secret, so no keychain lookup is actually required.
-type noopWhoamiKeychain struct{}
-
-func (noopWhoamiKeychain) Get(service, account string) (string, error) { return "", nil }
-func (noopWhoamiKeychain) Set(service, account, value string) error    { return nil }
-func (noopWhoamiKeychain) Remove(service, account string) error        { return nil }
-
-// credentialSourceSecret is the profile secret written to config for
-// TestWhoamiIncludesCredentialSource. It must never leak into whoami's output
-// (security: never leak a secret).
-const credentialSourceSecret = "test-secret"
-
-// profileSelectionFactory builds a Factory whose CredentialProvider resolves
-// an explicit profile ("tenant_a") supplied via the LARKSUITE_CLI_PROFILE env
-// fallback (not --profile), so Selection().Source resolves to
-// env:LARKSUITE_CLI_PROFILE and Explicit() is true, with no direct
-// app-credential env vars present.
-func profileSelectionFactory(t *testing.T) (*cmdutil.Factory, *bytes.Buffer) {
-	t.Helper()
-	t.Setenv(envvars.CliAppID, "")
-	t.Setenv(envvars.CliAppSecret, "")
-	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
-
-	multi := &core.MultiAppConfig{
-		CurrentApp: "tenant_a",
-		Apps: []core.AppConfig{{
-			Name:      "tenant_a",
-			AppId:     "cli_a",
-			AppSecret: core.PlainSecret(credentialSourceSecret),
-			Brand:     core.BrandFeishu,
-		}},
-	}
-	if err := core.SaveMultiAppConfig(multi); err != nil {
-		t.Fatalf("SaveMultiAppConfig: %v", err)
-	}
-
-	defaultAcct := credential.NewDefaultAccountProvider(func() keychain.KeychainAccess { return noopWhoamiKeychain{} }, "tenant_a")
-	cred := credential.NewCredentialProvider([]extcred.Provider{&envprovider.Provider{}}, defaultAcct, nil, nil)
-	cred.WithProfileFromEnv("tenant_a")
-
-	cfg := &core.CliConfig{ProfileName: "tenant_a", AppID: "cli_a", AppSecret: credentialSourceSecret, Brand: core.BrandFeishu}
-	out := &bytes.Buffer{}
-	f := &cmdutil.Factory{
-		Config:     func() (*core.CliConfig, error) { return cfg, nil },
-		Credential: cred,
-		IOStreams:  &cmdutil.IOStreams{Out: out, ErrOut: &bytes.Buffer{}},
-	}
-	return f, out
-}
-
-// TestWhoamiIncludesCredentialSource locks in the diagnostic fields surfaced
-// from the cached credential.IdentitySelection: credentialSource,
-// explicit, and directCredentialEnv. whoami must read the cached selection
-// as-is, not re-infer it.
-func TestWhoamiIncludesCredentialSource(t *testing.T) {
-	f, out := profileSelectionFactory(t)
-
-	cmd := NewCmdWhoami(f)
-	cmd.SetArgs([]string{})
-	if err := cmd.Execute(); err != nil {
-		t.Fatalf("Execute() error = %v", err)
-	}
-
-	raw := out.String()
-	if strings.Contains(raw, credentialSourceSecret) {
-		t.Fatalf("whoami output leaked the profile secret: %s", raw)
-	}
-
-	var got whoamiResult
-	if err := json.Unmarshal(out.Bytes(), &got); err != nil {
-		t.Fatalf("json.Unmarshal() error = %v\n%s", err, raw)
-	}
-	if got.CredentialSource != string(credential.SourceEnvProfile) {
-		t.Fatalf("credentialSource = %q, want %q", got.CredentialSource, credential.SourceEnvProfile)
-	}
-	if !got.Explicit {
-		t.Fatalf("explicit = false, want true")
-	}
-	if got.DirectCredentialEnv.Present {
-		t.Fatalf("directCredentialEnv.present = true, want false: %#v", got.DirectCredentialEnv)
-	}
-	if !strings.Contains(raw, `"credentialSource": "env:LARKSUITE_CLI_PROFILE"`) {
-		t.Fatalf("raw JSON missing credentialSource literal: %s", raw)
-	}
-	if got.DirectCredentialEnv.Present || len(got.DirectCredentialEnv.Keys) != 0 ||
-		got.DirectCredentialEnv.AppID != "" || got.DirectCredentialEnv.Matched || got.DirectCredentialEnv.ConflictsWithProfile {
-		t.Fatalf("directCredentialEnv = %#v, want only present:false set", got.DirectCredentialEnv)
-	}
-}

errs/ERROR_CONTRACT.md

@@ -67,17 +67,6 @@ Typed errors render to **stderr** as one JSON object per process exit:
 | `error.params` | per-Subtype-stable | per-parameter validation detail array (`ValidationError`); see **Validation parameters** |
 | per-Subtype extension fields | per-Subtype-stable | e.g. `missing_scopes`, `console_url`, `challenge_url` |
 
-Credential/identity-selection extension fields (per-Subtype-stable):
-
-| Field | Carrier | Subtypes | Notes |
-|-------|---------|----------|-------|
-| `missing_keys` | `ConfigError` | `app_credential_incomplete` | env var NAMES that must all be set; never values |
-| `required_any_of` | `ConfigError` | `app_credential_incomplete` | env var NAMES where any one completes the credential; mutually exclusive with `missing_keys` |
-| `profile` | `ConfigError` | `profile_not_found`, `profile_secret_invalid` | requested profile name |
-| `app_id` | `ConfigError` | `profile_secret_invalid` | plaintext app id; never a secret |
-| `credential_source` | `ConfigError` | `profile_not_found`, `no_active_profile` | how the identity was (not) chosen: `flag:--profile` \| `env:LARKSUITE_CLI_PROFILE` \| `config` |
-| `profile_app_id`, `env_app_id` | `ValidationError` | `profile_app_credential_conflict` | the two conflicting plaintext app ids |
-
 `SecurityPolicyError` renders through the same typed envelope as every
 other category. `error.type` is `"policy"`, `error.subtype` is one of
 `challenge_required` / `access_denied`, and process exit is `6` via

errs/marshal_test.go

@@ -136,79 +136,6 @@ func TestConfigError_MarshalJSON(t *testing.T) {
 	}
 }
 
-func TestConfigError_ProfileFieldsMarshalJSON(t *testing.T) {
-	ce := NewConfigError(SubtypeAppCredentialIncomplete, "incomplete").
-		WithMissingKeys("LARKSUITE_CLI_APP_ID", "LARKSUITE_CLI_APP_SECRET").
-		WithRequiredAnyOf("LARKSUITE_CLI_APP_SECRET", "LARKSUITE_CLI_USER_ACCESS_TOKEN").
-		WithProfile("work").
-		WithAppID("cli_abc").
-		WithCredentialSource("flag:--profile")
-	b, err := json.Marshal(ce)
-	if err != nil {
-		t.Fatal(err)
-	}
-	s := string(b)
-	for _, want := range []string{
-		`"type":"config"`,
-		`"subtype":"app_credential_incomplete"`,
-		`"missing_keys":["LARKSUITE_CLI_APP_ID","LARKSUITE_CLI_APP_SECRET"]`,
-		`"required_any_of":["LARKSUITE_CLI_APP_SECRET","LARKSUITE_CLI_USER_ACCESS_TOKEN"]`,
-		`"profile":"work"`,
-		`"app_id":"cli_abc"`,
-		`"credential_source":"flag:--profile"`,
-	} {
-		if !strings.Contains(s, want) {
-			t.Errorf("missing %q in %s", want, s)
-		}
-	}
-
-	// omitempty: unset fields must not appear on the wire.
-	empty := NewConfigError(SubtypeProfileNotFound, "x")
-	b2, err := json.Marshal(empty)
-	if err != nil {
-		t.Fatal(err)
-	}
-	s2 := string(b2)
-	for _, notWant := range []string{`"missing_keys"`, `"required_any_of"`, `"profile"`, `"app_id"`, `"credential_source"`} {
-		if strings.Contains(s2, notWant) {
-			t.Errorf("%q should be omitted when empty; got %s", notWant, s2)
-		}
-	}
-}
-
-func TestValidationError_ProfileConflictMarshalJSON(t *testing.T) {
-	ve := NewValidationError(SubtypeProfileAppCredentialConflict, "conflict").
-		WithProfileAppConflict("cli_profile", "cli_env")
-	b, err := json.Marshal(ve)
-	if err != nil {
-		t.Fatal(err)
-	}
-	s := string(b)
-	for _, want := range []string{
-		`"type":"validation"`,
-		`"subtype":"profile_app_credential_conflict"`,
-		`"profile_app_id":"cli_profile"`,
-		`"env_app_id":"cli_env"`,
-	} {
-		if !strings.Contains(s, want) {
-			t.Errorf("missing %q in %s", want, s)
-		}
-	}
-
-	// omitempty: unset conflict fields must not appear on the wire.
-	empty := NewValidationError(SubtypeInvalidArgument, "x")
-	b2, err := json.Marshal(empty)
-	if err != nil {
-		t.Fatal(err)
-	}
-	s2 := string(b2)
-	for _, notWant := range []string{`"profile_app_id"`, `"env_app_id"`} {
-		if strings.Contains(s2, notWant) {
-			t.Errorf("%q should be omitted when empty; got %s", notWant, s2)
-		}
-	}
-}
-
 func TestNetworkError_MarshalJSON(t *testing.T) {
 	ne := &NetworkError{
 		Problem: Problem{Category: CategoryNetwork, Subtype: SubtypeNetworkTimeout, Message: "dial timeout"},

errs/subtypes.go

@@ -12,9 +12,8 @@ const (
 
 // CategoryValidation subtypes
 const (
-	SubtypeInvalidArgument              Subtype = "invalid_argument"                // user-supplied flag / arg failed validation (gRPC INVALID_ARGUMENT alignment)
-	SubtypeFailedPrecondition           Subtype = "failed_precondition"             // request is valid but the system/resource state is not in the state required to execute; caller must change state (not retry) — e.g. ambiguous remote mapping (gRPC FAILED_PRECONDITION alignment)
-	SubtypeProfileAppCredentialConflict Subtype = "profile_app_credential_conflict" // profile and direct app env both set but app_id differs
+	SubtypeInvalidArgument    Subtype = "invalid_argument"    // user-supplied flag / arg failed validation (gRPC INVALID_ARGUMENT alignment)
+	SubtypeFailedPrecondition Subtype = "failed_precondition" // request is valid but the system/resource state is not in the state required to execute; caller must change state (not retry) — e.g. ambiguous remote mapping (gRPC FAILED_PRECONDITION alignment)
 )
 
 // CategoryAuthentication subtypes
@@ -42,13 +41,9 @@ const (
 
 // CategoryConfig subtypes
 const (
-	SubtypeInvalidClient           Subtype = "invalid_client"            // app_id / app_secret incorrect (RFC 6749 §5.2 alignment)
-	SubtypeNotConfigured           Subtype = "not_configured"            // local config file absent (user has not run `config init`)
-	SubtypeInvalidConfig           Subtype = "invalid_config"            // local config file present but malformed
-	SubtypeProfileNotFound         Subtype = "profile_not_found"         // --profile / LARKSUITE_CLI_PROFILE points to a nonexistent profile
-	SubtypeNoActiveProfile         Subtype = "no_active_profile"         // no active identity input and no usable default profile
-	SubtypeAppCredentialIncomplete Subtype = "app_credential_incomplete" // direct app env missing app_id or app_secret
-	SubtypeProfileSecretInvalid    Subtype = "profile_secret_invalid"    // profile exists but its secret cannot be resolved locally
+	SubtypeInvalidClient Subtype = "invalid_client" // app_id / app_secret incorrect (RFC 6749 §5.2 alignment)
+	SubtypeNotConfigured Subtype = "not_configured" // local config file absent (user has not run `config init`)
+	SubtypeInvalidConfig Subtype = "invalid_config" // local config file present but malformed
 )
 
 // CategoryNetwork subtypes

errs/types.go

@@ -61,11 +61,9 @@ type TypedError interface {
 // it is intentionally not serialized.
 type ValidationError struct {
 	Problem
-	Param        string         `json:"param,omitempty"`
-	Params       []InvalidParam `json:"params,omitempty"`
-	ProfileAppID string         `json:"profile_app_id,omitempty"`
-	EnvAppID     string         `json:"env_app_id,omitempty"`
-	Cause        error          `json:"-"`
+	Param  string         `json:"param,omitempty"`
+	Params []InvalidParam `json:"params,omitempty"`
+	Cause  error          `json:"-"`
 }
 
 // InvalidParam is one structured validation diagnostic: the parameter that
@@ -152,12 +150,6 @@ func (e *ValidationError) WithCause(cause error) *ValidationError {
 	return e
 }
 
-func (e *ValidationError) WithProfileAppConflict(profileAppID, envAppID string) *ValidationError {
-	e.ProfileAppID = profileAppID
-	e.EnvAppID = envAppID
-	return e
-}
-
 // =========================== AuthenticationError =============================
 
 // AuthenticationError is the typed error for CategoryAuthentication.
@@ -323,18 +315,8 @@ func (e *PermissionError) WithCause(cause error) *PermissionError {
 // intentionally not serialized.
 type ConfigError struct {
 	Problem
-	Field         string   `json:"field,omitempty"`
-	MissingKeys   []string `json:"missing_keys,omitempty"`
-	RequiredAnyOf []string `json:"required_any_of,omitempty"`
-	Profile       string   `json:"profile,omitempty"`
-	AppID         string   `json:"app_id,omitempty"`
-	// CredentialSource is the machine-readable App/credential selection source
-	// that produced this config error (e.g. "flag:--profile",
-	// "env:LARKSUITE_CLI_PROFILE", "config"). It is required on
-	// profile_not_found and no_active_profile so an agent can branch
-	// on how the identity was (or was not) chosen. It is never a secret.
-	CredentialSource string `json:"credential_source,omitempty"`
-	Cause            error  `json:"-"`
+	Field string `json:"field,omitempty"`
+	Cause error  `json:"-"`
 }
 
 // Unwrap is nil-receiver safe; see ValidationError.Unwrap.
@@ -388,34 +370,6 @@ func (e *ConfigError) WithField(field string) *ConfigError {
 	return e
 }
 
-func (e *ConfigError) WithMissingKeys(keys ...string) *ConfigError {
-	e.MissingKeys = slices.Clone(keys)
-	return e
-}
-
-func (e *ConfigError) WithRequiredAnyOf(keys ...string) *ConfigError {
-	e.RequiredAnyOf = slices.Clone(keys)
-	return e
-}
-
-func (e *ConfigError) WithProfile(name string) *ConfigError {
-	e.Profile = name
-	return e
-}
-
-func (e *ConfigError) WithAppID(appID string) *ConfigError {
-	e.AppID = appID
-	return e
-}
-
-// WithCredentialSource records the machine-readable credential-selection source
-// on the wire (snake_case credential_source). The value is an enum string
-// (e.g. "flag:--profile", "config"), never a secret.
-func (e *ConfigError) WithCredentialSource(source string) *ConfigError {
-	e.CredentialSource = source
-	return e
-}
-
 func (e *ConfigError) WithCause(cause error) *ConfigError {
 	e.Cause = cause
 	return e

errs/types_test.go

@@ -643,29 +643,3 @@ func TestBuilderSetter_DefensiveCopy(t *testing.T) {
 		}
 	})
 }
-
-// ======================= Profile selection error subtypes =======================
-
-func TestConfigErrorProfileFields(t *testing.T) {
-	e := errs.NewConfigError(errs.SubtypeAppCredentialIncomplete, "incomplete").
-		WithMissingKeys("LARKSUITE_CLI_APP_ID").
-		WithCredentialSource("env:LARKSUITE_CLI_PROFILE")
-	p, ok := errs.ProblemOf(e)
-	if !ok || p.Subtype != errs.SubtypeAppCredentialIncomplete {
-		t.Fatalf("subtype mismatch: %+v", p)
-	}
-	if len(e.MissingKeys) != 1 || e.MissingKeys[0] != "LARKSUITE_CLI_APP_ID" {
-		t.Errorf("missing_keys not set: %v", e.MissingKeys)
-	}
-	if e.CredentialSource != "env:LARKSUITE_CLI_PROFILE" {
-		t.Errorf("credential_source not set: %q", e.CredentialSource)
-	}
-}
-
-func TestValidationErrorProfileConflict(t *testing.T) {
-	e := errs.NewValidationError(errs.SubtypeProfileAppCredentialConflict, "conflict").
-		WithProfileAppConflict("cli_profile", "cli_env")
-	if e.ProfileAppID != "cli_profile" || e.EnvAppID != "cli_env" {
-		t.Errorf("conflict fields not set: %q %q", e.ProfileAppID, e.EnvAppID)
-	}
-}

extension/credential/env/env.go

@@ -23,89 +23,63 @@ func (p *Provider) ResolveAccount(ctx context.Context) (*credential.Account, err
 	appSecret := os.Getenv(envvars.CliAppSecret)
 	hasUAT := os.Getenv(envvars.CliUserAccessToken) != ""
 	hasTAT := os.Getenv(envvars.CliTenantAccessToken) != ""
-	presentKeys := presentCredentialEnvKeys(appID, appSecret, hasUAT, hasTAT)
-	if len(presentKeys) == 0 {
-		return nil, nil
+	if appID == "" && appSecret == "" {
+		switch {
+		case hasUAT:
+			return nil, &credential.BlockError{Provider: "env", Reason: envvars.CliUserAccessToken + " is set but " + envvars.CliAppID + " is missing"}
+		case hasTAT:
+			return nil, &credential.BlockError{Provider: "env", Reason: envvars.CliTenantAccessToken + " is set but " + envvars.CliAppID + " is missing"}
+		default:
+			return nil, nil
+		}
 	}
+	if appID == "" {
+		return nil, &credential.BlockError{Provider: "env", Reason: envvars.CliAppSecret + " is set but " + envvars.CliAppID + " is missing"}
+	}
+	if appSecret == "" && !hasUAT && !hasTAT {
+		return nil, &credential.BlockError{
+			Provider: "env",
+			Reason:   envvars.CliAppID + " is set but no app secret or access token is available",
+		}
+	}
+	brand := credential.Brand(core.ParseBrand(os.Getenv(envvars.CliBrand)))
+	acct := &credential.Account{AppID: appID, AppSecret: appSecret, Brand: brand}
 
-	// Identity policy variables are validated whenever a direct credential
-	// input is present. Their errors must not be hidden by a later credential
-	// completeness check or profile arbitration.
-	defaultAs := credential.Identity(os.Getenv(envvars.CliDefaultAs))
-	switch defaultAs {
-	case "", credential.IdentityAuto, credential.IdentityUser, credential.IdentityBot:
+	switch id := credential.Identity(os.Getenv(envvars.CliDefaultAs)); id {
+	case "", credential.IdentityAuto:
+		acct.DefaultAs = id
+	case credential.IdentityUser, credential.IdentityBot:
+		acct.DefaultAs = id
 	default:
 		return nil, &credential.BlockError{
 			Provider: "env",
-			Reason:   fmt.Sprintf("invalid %s %q (want user, bot, or auto)", envvars.CliDefaultAs, defaultAs),
-			Code:     credential.BlockReasonInvalidPolicy,
-			Param:    envvars.CliDefaultAs,
+			Reason:   fmt.Sprintf("invalid %s %q (want user, bot, or auto)", envvars.CliDefaultAs, id),
 		}
 	}
 
-	strictMode := os.Getenv(envvars.CliStrictMode)
-	var supported credential.IdentitySupport
-	switch strictMode {
+	// Explicit strict mode policy takes priority
+	switch strictMode := os.Getenv(envvars.CliStrictMode); strictMode {
 	case "bot":
-		supported = credential.SupportsBot
+		acct.SupportedIdentities = credential.SupportsBot
 	case "user":
-		supported = credential.SupportsUser
+		acct.SupportedIdentities = credential.SupportsUser
 	case "off":
-		supported = credential.SupportsAll
+		acct.SupportedIdentities = credential.SupportsAll
 	case "":
+		// Infer from available tokens
 		if hasUAT {
-			supported |= credential.SupportsUser
+			acct.SupportedIdentities |= credential.SupportsUser
 		}
 		if hasTAT {
-			supported |= credential.SupportsBot
+			acct.SupportedIdentities |= credential.SupportsBot
 		}
 	default:
 		return nil, &credential.BlockError{
 			Provider: "env",
 			Reason:   fmt.Sprintf("invalid %s %q (want bot, user, or off)", envvars.CliStrictMode, strictMode),
-			Code:     credential.BlockReasonInvalidPolicy,
-			Param:    envvars.CliStrictMode,
 		}
 	}
 
-	if appID == "" && appSecret == "" {
-		switch {
-		case hasUAT:
-			return nil, incompleteCredentialError(
-				appID,
-				envvars.CliUserAccessToken+" is set but "+envvars.CliAppID+" is missing",
-				[]string{envvars.CliAppID}, nil, presentKeys)
-		case hasTAT:
-			return nil, incompleteCredentialError(
-				appID,
-				envvars.CliTenantAccessToken+" is set but "+envvars.CliAppID+" is missing",
-				[]string{envvars.CliAppID}, nil, presentKeys)
-		}
-	}
-	if appID == "" {
-		return nil, incompleteCredentialError(
-			appID,
-			envvars.CliAppSecret+" is set but "+envvars.CliAppID+" is missing",
-			[]string{envvars.CliAppID}, nil, presentKeys)
-	}
-	if appSecret == "" && !hasUAT && !hasTAT {
-		return nil, incompleteCredentialError(
-			appID,
-			envvars.CliAppID+" is set but no app secret or access token is available",
-			nil,
-			[]string{envvars.CliAppSecret, envvars.CliUserAccessToken, envvars.CliTenantAccessToken},
-			presentKeys)
-	}
-	brand := credential.Brand(core.ParseBrand(os.Getenv(envvars.CliBrand)))
-	acct := &credential.Account{
-		AppID:               appID,
-		AppSecret:           appSecret,
-		Brand:               brand,
-		DefaultAs:           defaultAs,
-		SupportedIdentities: supported,
-		Kind:                credential.AccountDirect,
-	}
-
 	if acct.DefaultAs == "" {
 		switch {
 		case hasUAT:
@@ -118,35 +92,6 @@ func (p *Provider) ResolveAccount(ctx context.Context) (*credential.Account, err
 	return acct, nil
 }
 
-func incompleteCredentialError(appID, reason string, missingKeys, requiredAnyOf, presentKeys []string) *credential.BlockError {
-	return &credential.BlockError{
-		Provider:      "env",
-		Reason:        reason,
-		Code:          credential.BlockReasonCredentialIncomplete,
-		MissingKeys:   missingKeys,
-		RequiredAnyOf: requiredAnyOf,
-		PresentKeys:   presentKeys,
-		AppID:         appID,
-	}
-}
-
-func presentCredentialEnvKeys(appID, appSecret string, hasUAT, hasTAT bool) []string {
-	var keys []string
-	if appID != "" {
-		keys = append(keys, envvars.CliAppID)
-	}
-	if appSecret != "" {
-		keys = append(keys, envvars.CliAppSecret)
-	}
-	if hasUAT {
-		keys = append(keys, envvars.CliUserAccessToken)
-	}
-	if hasTAT {
-		keys = append(keys, envvars.CliTenantAccessToken)
-	}
-	return keys
-}
-
 func (p *Provider) ResolveToken(ctx context.Context, req credential.TokenSpec) (*credential.Token, error) {
 	var envKey string
 	switch req.Type {

extension/credential/env/env_test.go

@@ -6,7 +6,6 @@ package env
 import (
 	"context"
 	"errors"
-	"slices"
 	"strings"
 	"testing"
 
@@ -48,22 +47,6 @@ func TestResolveAccount_OnlyIDSet(t *testing.T) {
 	if !errors.As(err, &blockErr) {
 		t.Fatalf("expected BlockError, got %v", err)
 	}
-	if blockErr.Code != credential.BlockReasonCredentialIncomplete {
-		t.Fatalf("Code = %q, want %q", blockErr.Code, credential.BlockReasonCredentialIncomplete)
-	}
-	want := []string{envvars.CliAppSecret, envvars.CliUserAccessToken, envvars.CliTenantAccessToken}
-	if !slices.Equal(blockErr.RequiredAnyOf, want) {
-		t.Fatalf("RequiredAnyOf = %v, want %v", blockErr.RequiredAnyOf, want)
-	}
-	if len(blockErr.MissingKeys) != 0 {
-		t.Fatalf("MissingKeys = %v, want empty", blockErr.MissingKeys)
-	}
-	if !slices.Equal(blockErr.PresentKeys, []string{envvars.CliAppID}) {
-		t.Fatalf("PresentKeys = %v, want [%s]", blockErr.PresentKeys, envvars.CliAppID)
-	}
-	if blockErr.AppID != "cli_test" {
-		t.Fatalf("AppID = %q, want cli_test", blockErr.AppID)
-	}
 }
 
 func TestResolveAccount_AppIDAndUserTokenWithoutSecret(t *testing.T) {
@@ -92,81 +75,18 @@ func TestResolveAccount_OnlySecretSet(t *testing.T) {
 	if !errors.As(err, &blockErr) {
 		t.Fatalf("expected BlockError, got %v", err)
 	}
-	if blockErr.Code != credential.BlockReasonCredentialIncomplete ||
-		!slices.Equal(blockErr.MissingKeys, []string{envvars.CliAppID}) ||
-		!slices.Equal(blockErr.PresentKeys, []string{envvars.CliAppSecret}) {
-		t.Fatalf("BlockError = %+v, want incomplete with missing APP_ID and present APP_SECRET", blockErr)
-	}
-	if len(blockErr.RequiredAnyOf) != 0 {
-		t.Fatalf("RequiredAnyOf = %v, want empty for APP_SECRET-only", blockErr.RequiredAnyOf)
-	}
 }
 
 func TestResolveAccount_OnlyTokenSetWithoutAppID(t *testing.T) {
-	for _, tt := range []struct {
-		name string
-		key  string
-	}{
-		{name: "UAT", key: envvars.CliUserAccessToken},
-		{name: "TAT", key: envvars.CliTenantAccessToken},
-	} {
-		t.Run(tt.name, func(t *testing.T) {
-			t.Setenv(envvars.CliAppID, "")
-			t.Setenv(envvars.CliAppSecret, "")
-			t.Setenv(envvars.CliUserAccessToken, "")
-			t.Setenv(envvars.CliTenantAccessToken, "")
-			t.Setenv(tt.key, "token_test")
+	t.Setenv(envvars.CliUserAccessToken, "uat_test")
 
-			_, err := (&Provider{}).ResolveAccount(context.Background())
-			var blockErr *credential.BlockError
-			if !errors.As(err, &blockErr) {
-				t.Fatalf("expected BlockError, got %v", err)
-			}
-			if !strings.Contains(err.Error(), envvars.CliAppID) {
-				t.Fatalf("error = %v, want mention of %s", err, envvars.CliAppID)
-			}
-			if blockErr.Code != credential.BlockReasonCredentialIncomplete ||
-				!slices.Equal(blockErr.MissingKeys, []string{envvars.CliAppID}) ||
-				!slices.Equal(blockErr.PresentKeys, []string{tt.key}) {
-				t.Fatalf("BlockError = %+v, want incomplete for %s", blockErr, tt.key)
-			}
-			if len(blockErr.RequiredAnyOf) != 0 {
-				t.Fatalf("RequiredAnyOf = %v, want empty for %s-only", blockErr.RequiredAnyOf, tt.name)
-			}
-		})
+	_, err := (&Provider{}).ResolveAccount(context.Background())
+	var blockErr *credential.BlockError
+	if !errors.As(err, &blockErr) {
+		t.Fatalf("expected BlockError, got %v", err)
 	}
-}
-
-func TestResolveAccount_InvalidPolicyRejectedBeforeIncomplete(t *testing.T) {
-	for _, tt := range []struct {
-		name string
-		key  string
-	}{
-		{name: "DEFAULT_AS", key: envvars.CliDefaultAs},
-		{name: "STRICT_MODE", key: envvars.CliStrictMode},
-	} {
-		t.Run(tt.name, func(t *testing.T) {
-			t.Setenv(envvars.CliAppID, "cli_test")
-			t.Setenv(envvars.CliAppSecret, "")
-			t.Setenv(envvars.CliUserAccessToken, "")
-			t.Setenv(envvars.CliTenantAccessToken, "")
-			t.Setenv(tt.key, "banana")
-
-			_, err := (&Provider{}).ResolveAccount(context.Background())
-			var blockErr *credential.BlockError
-			if !errors.As(err, &blockErr) {
-				t.Fatalf("error = %T %v, want BlockError", err, err)
-			}
-			if blockErr.Code != credential.BlockReasonInvalidPolicy {
-				t.Fatalf("Code = %q, want %q", blockErr.Code, credential.BlockReasonInvalidPolicy)
-			}
-			if blockErr.Param != tt.key {
-				t.Fatalf("Param = %q, want %q", blockErr.Param, tt.key)
-			}
-			if !strings.Contains(blockErr.Reason, tt.key) {
-				t.Fatalf("reason = %q, want %s", blockErr.Reason, tt.key)
-			}
-		})
+	if !strings.Contains(err.Error(), envvars.CliAppID) {
+		t.Fatalf("error = %v, want mention of %s", err, envvars.CliAppID)
 	}
 }
 
@@ -338,9 +258,6 @@ func TestResolveAccount_InvalidStrictModeRejected(t *testing.T) {
 	if !errors.As(err, &blockErr) {
 		t.Fatalf("expected BlockError, got %T", err)
 	}
-	if blockErr.Code != credential.BlockReasonInvalidPolicy || blockErr.Param != envvars.CliStrictMode {
-		t.Fatalf("BlockError = %+v, want invalid_policy with Param %s", blockErr, envvars.CliStrictMode)
-	}
 	if !strings.Contains(err.Error(), envvars.CliStrictMode) {
 		t.Fatalf("error = %v, want mention of %s", err, envvars.CliStrictMode)
 	}
@@ -359,9 +276,6 @@ func TestResolveAccount_InvalidDefaultAsRejected(t *testing.T) {
 	if !errors.As(err, &blockErr) {
 		t.Fatalf("expected BlockError, got %T", err)
 	}
-	if blockErr.Code != credential.BlockReasonInvalidPolicy || blockErr.Param != envvars.CliDefaultAs {
-		t.Fatalf("BlockError = %+v, want invalid_policy with Param %s", blockErr, envvars.CliDefaultAs)
-	}
 	if !strings.Contains(err.Error(), envvars.CliDefaultAs) {
 		t.Fatalf("error = %v, want mention of %s", err, envvars.CliDefaultAs)
 	}

extension/credential/sidecar/provider.go

@@ -77,8 +77,6 @@ func (p *Provider) ResolveAccount(ctx context.Context) (*credential.Account, err
 		return nil, &credential.BlockError{
 			Provider: "sidecar",
 			Reason:   fmt.Sprintf("invalid %s %q (want user, bot, or auto)", envvars.CliDefaultAs, id),
-			Code:     credential.BlockReasonInvalidPolicy,
-			Param:    envvars.CliDefaultAs,
 		}
 	}
 
@@ -94,8 +92,6 @@ func (p *Provider) ResolveAccount(ctx context.Context) (*credential.Account, err
 		return nil, &credential.BlockError{
 			Provider: "sidecar",
 			Reason:   fmt.Sprintf("invalid %s %q (want bot, user, or off)", envvars.CliStrictMode, strictMode),
-			Code:     credential.BlockReasonInvalidPolicy,
-			Param:    envvars.CliStrictMode,
 		}
 	}
 

extension/credential/sidecar/provider_test.go

@@ -7,9 +7,7 @@ package sidecar
 
 import (
 	"context"
-	"errors"
 	"os"
-	"strings"
 	"testing"
 
 	"github.com/larksuite/cli/extension/credential"
@@ -148,57 +146,6 @@ func TestResolveAccount_StrictMode(t *testing.T) {
 	}
 }
 
-func TestResolveAccount_InvalidPolicyClassified(t *testing.T) {
-	setEnv(t, envvars.CliAuthProxy, "http://127.0.0.1:16384")
-	setEnv(t, envvars.CliProxyKey, "test-key")
-	setEnv(t, envvars.CliAppID, "cli_test")
-
-	tests := []struct {
-		name          string
-		key           string
-		value         string
-		supportedText string
-	}{
-		{
-			name:          "default as",
-			key:           envvars.CliDefaultAs,
-			value:         "banana",
-			supportedText: "want user, bot, or auto",
-		},
-		{
-			name:          "strict mode",
-			key:           envvars.CliStrictMode,
-			value:         "banana",
-			supportedText: "want bot, user, or off",
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			unsetEnv(t, envvars.CliDefaultAs)
-			unsetEnv(t, envvars.CliStrictMode)
-			setEnv(t, tt.key, tt.value)
-
-			_, err := (&Provider{}).ResolveAccount(context.Background())
-			var blockErr *credential.BlockError
-			if !errors.As(err, &blockErr) {
-				t.Fatalf("error = %T %v, want BlockError", err, err)
-			}
-			if blockErr.Code != credential.BlockReasonInvalidPolicy {
-				t.Fatalf("Code = %q, want %q", blockErr.Code, credential.BlockReasonInvalidPolicy)
-			}
-			if blockErr.Param != tt.key {
-				t.Fatalf("Param = %q, want %q", blockErr.Param, tt.key)
-			}
-			if !strings.Contains(blockErr.Reason, tt.key) ||
-				!strings.Contains(blockErr.Reason, tt.value) ||
-				!strings.Contains(blockErr.Reason, tt.supportedText) {
-				t.Fatalf("Reason = %q, want variable, invalid value, and supported values", blockErr.Reason)
-			}
-		})
-	}
-}
-
 func TestResolveToken_NotActive(t *testing.T) {
 	unsetEnv(t, envvars.CliAuthProxy)
 

extension/credential/types.go

@@ -44,27 +44,6 @@ func (s IdentitySupport) UserOnly() bool { return s == SupportsUser }
 // BotOnly returns true if only bot identity is supported.
 func (s IdentitySupport) BotOnly() bool { return s == SupportsBot }
 
-// AccountKind declares how an account participates in credential arbitration.
-type AccountKind int
-
-const (
-	// AccountManaged means the provider owns the whole identity; winning it
-	// ends arbitration outright. The zero value, so existing providers are
-	// unchanged.
-	AccountManaged AccountKind = iota
-	// AccountDirect marks an actively supplied raw credential (the env
-	// provider's LARKSUITE_CLI_* variables). It participates in profile
-	// arbitration and conflict detection instead of winning outright.
-	//
-	// RESERVED: only the builtin env provider may declare AccountDirect
-	// today — the arbitration's direct-credential diagnostics are defined in
-	// terms of the process environment, and the caller rejects AccountDirect
-	// from any other provider. Third-party providers must return
-	// AccountManaged until the SPI carries provider-reported input
-	// descriptors.
-	AccountDirect
-)
-
 // Account holds resolved app credentials and configuration.
 type Account struct {
 	AppID               string
@@ -74,7 +53,6 @@ type Account struct {
 	ProfileName         string
 	OpenID              string          // optional; if UAT is available, API result takes precedence
 	SupportedIdentities IdentitySupport // zero = provider did not declare; treat as no restriction
-	Kind                AccountKind     // AccountManaged (default) or AccountDirect
 }
 
 // Token holds a resolved access token and optional metadata.
@@ -98,38 +76,11 @@ type TokenSpec struct {
 	AppID string
 }
 
-// BlockReason classifies provider-originated block conditions that callers may
-// safely map to a more specific public error contract.
-type BlockReason string
-
-const (
-	// BlockReasonCredentialIncomplete marks incomplete inputs from the builtin
-	// process-env credential provider. It is reserved for that provider because
-	// direct-credential arbitration and diagnostics currently name the fixed
-	// LARKSUITE_CLI_* env surface. Third-party providers must return an
-	// unclassified BlockError until the SPI carries provider-owned input
-	// descriptors. Blocks without a Code propagate unchanged.
-	BlockReasonCredentialIncomplete BlockReason = "credential_incomplete"
-
-	// BlockReasonInvalidPolicy marks a user-supplied policy input (e.g.
-	// LARKSUITE_CLI_DEFAULT_AS / LARKSUITE_CLI_STRICT_MODE) that failed
-	// validation. The caller maps it to a typed validation error carrying
-	// Param and a repair hint, so user input mistakes never surface as
-	// internal errors.
-	BlockReasonInvalidPolicy BlockReason = "invalid_policy"
-)
-
 // BlockError is returned by a Provider to actively reject a request
 // and prevent subsequent providers in the chain from being consulted.
 type BlockError struct {
-	Provider      string
-	Reason        string
-	Code          BlockReason
-	MissingKeys   []string // environment variable names only; never values
-	RequiredAnyOf []string // environment variable names only; never values
-	PresentKeys   []string // environment variable names only; never values
-	AppID         string   // plaintext app identifier used only for source comparison; never a secret
-	Param         string   // name of the invalid input variable on invalid_policy blocks; never a value
+	Provider string
+	Reason   string
 }
 
 func (e *BlockError) Error() string {

extension/transport/sidecar/interceptor_test.go

@@ -12,9 +12,18 @@ import (
 	"net/http"
 	"testing"
 
+	exttransport "github.com/larksuite/cli/extension/transport"
+	"github.com/larksuite/cli/internal/envvars"
+	internaltransport "github.com/larksuite/cli/internal/transport"
 	"github.com/larksuite/cli/sidecar"
 )
 
+type roundTripFunc func(*http.Request) (*http.Response, error)
+
+func (f roundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
+	return f(req)
+}
+
 // failingBody is a ReadCloser that errors on Read and tracks Close calls.
 type failingBody struct {
 	err      error
@@ -263,3 +272,55 @@ func TestInterceptor_EmptyBody(t *testing.T) {
 		t.Errorf("body SHA256 = %q, want empty-string SHA256 %q", sha, expectedEmpty)
 	}
 }
+
+func TestLegacySidecarProviderStillHandlesForcedExternalRequests(t *testing.T) {
+	t.Setenv(envvars.CliAuthProxy, "http://127.0.0.1:16384")
+	t.Setenv(envvars.CliProxyKey, "test-key")
+	previousProvider := exttransport.GetProvider()
+	exttransport.Register(&Provider{})
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+
+	seen := make(chan *http.Request, 2)
+	base := roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		seen <- req.Clone(req.Context())
+		return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+	})
+	client := internaltransport.ClientForRequestClass(
+		&http.Client{Transport: internaltransport.NewHTTPPolicyRouter(base, base)},
+		exttransport.RequestClassExternal,
+	)
+
+	withSentinel, err := http.NewRequest(http.MethodGet, "https://external.example/protected", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	withSentinel.Header.Set("Authorization", "Bearer "+sidecar.SentinelUAT)
+	resp, err := client.Do(withSentinel)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+
+	withoutSentinel, err := http.NewRequest(http.MethodGet, "https://external.example/public", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err = client.Do(withoutSentinel)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+
+	proxied := <-seen
+	if proxied.URL.Scheme != "http" || proxied.URL.Host != "127.0.0.1:16384" {
+		t.Fatalf("sentinel request URL = %s, want sidecar route", proxied.URL)
+	}
+	if got := proxied.Header.Get(sidecar.HeaderProxyTarget); got != "https://external.example" {
+		t.Fatalf("sentinel request proxy target = %q", got)
+	}
+
+	passthrough := <-seen
+	if got := passthrough.URL.String(); got != "https://external.example/public" {
+		t.Fatalf("non-sentinel request URL = %q, want unchanged", got)
+	}
+}

extension/transport/types.go

@@ -15,6 +15,27 @@ type Provider interface {
 	ResolveInterceptor(ctx context.Context) Interceptor
 }
 
+// RequestClass describes the trust boundary of an outbound HTTP request.
+// Platform requests target endpoints owned by the CLI's endpoint resolver;
+// external requests target user-provided, pre-signed, CDN, registry, or other
+// non-platform URLs. Redirect targets are classified again from each hop's
+// logical URL; rewriting a host in an interceptor does not add that host to
+// the platform endpoint catalog.
+type RequestClass string
+
+const (
+	RequestClassPlatform RequestClass = "platform"
+	RequestClassExternal RequestClass = "external"
+)
+
+// ScopedProvider optionally limits a Provider to selected request classes.
+// Providers that do not implement this interface retain the original
+// behavior and apply to every request class.
+type ScopedProvider interface {
+	Provider
+	SupportsRequestClass(RequestClass) bool
+}
+
 // Interceptor defines network-layer customization via a pre/post hook pair.
 // The built-in transport chain always executes between PreRoundTrip and the
 // returned post function, and cannot be skipped or overridden by the extension.

internal/auth/transport.go

@@ -17,6 +17,8 @@ import (
 	"github.com/larksuite/cli/internal/transport"
 )
 
+var _ transport.RoundTripperDecorator = (*SecurityPolicyTransport)(nil)
+
 // SecurityPolicyTransport is an http.RoundTripper that intercepts all responses
 // and checks for security policy errors.
 type SecurityPolicyTransport struct {
@@ -31,6 +33,16 @@ func (t *SecurityPolicyTransport) base() http.RoundTripper {
 	return transport.Fallback()
 }
 
+func (t *SecurityPolicyTransport) BaseRoundTripper() http.RoundTripper {
+	return t.base()
+}
+
+func (t *SecurityPolicyTransport) WithBaseRoundTripper(base http.RoundTripper) http.RoundTripper {
+	cloned := *t
+	cloned.Base = base
+	return &cloned
+}
+
 // RoundTrip implements http.RoundTripper.
 func (t *SecurityPolicyTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	resp, err := t.base().RoundTrip(req)

internal/client/client.go

@@ -212,6 +212,9 @@ func (c *APIClient) DoStream(ctx context.Context, req *larkcore.ApiReq, as core.
 	resp, err := httpClient.Do(httpReq)
 	if err != nil {
 		cancel()
+		if _, ok := errs.ProblemOf(err); ok {
+			return nil, err
+		}
 		return nil, errs.NewNetworkError(classifyNetworkSubtype(err), "stream request failed: %s", err).WithCause(err)
 	}
 	resp.Body = &cancelOnCloseBody{ReadCloser: resp.Body, cancel: cancel}

internal/client/client_test.go

@@ -48,18 +48,6 @@ func (s *staticTokenResolver) ResolveToken(_ context.Context, _ credential.Token
 	return &credential.TokenResult{Token: "test-token"}, nil
 }
 
-type clientTestAccountResolver struct {
-	appID string
-}
-
-func (r clientTestAccountResolver) ResolveAccount(context.Context) (*credential.Account, error) {
-	return &credential.Account{AppID: r.appID, Brand: core.BrandFeishu}, nil
-}
-
-func newClientTestCredentialProvider(appID string, tokenResolver credential.DefaultTokenResolver) *credential.CredentialProvider {
-	return credential.NewCredentialProvider(nil, clientTestAccountResolver{appID: appID}, tokenResolver, nil)
-}
-
 // newTestAPIClient creates an APIClient with a mock HTTP transport.
 func newTestAPIClient(t *testing.T, rt http.RoundTripper) (*APIClient, *bytes.Buffer) {
 	t.Helper()
@@ -70,7 +58,7 @@ func newTestAPIClient(t *testing.T, rt http.RoundTripper) (*APIClient, *bytes.Bu
 		lark.WithLogLevel(larkcore.LogLevelError),
 		lark.WithHttpClient(httpClient),
 	)
-	testCred := newClientTestCredentialProvider("test-app", &staticTokenResolver{})
+	testCred := credential.NewCredentialProvider(nil, nil, &staticTokenResolver{}, nil)
 	cfg := &core.CliConfig{AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu}
 	return &APIClient{
 		SDK:        sdk,
@@ -475,7 +463,7 @@ func TestDoStream_IgnoresBaseHTTPClientTimeout(t *testing.T) {
 
 	ac := &APIClient{
 		HTTP:       &http.Client{Timeout: 5 * time.Millisecond},
-		Credential: newClientTestCredentialProvider("test-app", &staticTokenResolver{}),
+		Credential: credential.NewCredentialProvider(nil, nil, &staticTokenResolver{}, nil),
 		Config:     &core.CliConfig{AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu},
 	}
 
@@ -510,7 +498,7 @@ func TestDoStream_TransportFailureSplitsSubtype(t *testing.T) {
 	})
 	ac := &APIClient{
 		HTTP:       &http.Client{Transport: rt},
-		Credential: newClientTestCredentialProvider("test-app", &staticTokenResolver{}),
+		Credential: credential.NewCredentialProvider(nil, nil, &staticTokenResolver{}, nil),
 		Config:     &core.CliConfig{AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu},
 	}
 
@@ -530,6 +518,29 @@ func TestDoStream_TransportFailureSplitsSubtype(t *testing.T) {
 	}
 }
 
+func TestDoStream_PreservesTypedTransportError(t *testing.T) {
+	policyErr := errs.NewSecurityPolicyError(errs.SubtypeAccessDenied, "blocked redirect")
+	ac := &APIClient{
+		HTTP: &http.Client{Transport: roundTripFunc(func(*http.Request) (*http.Response, error) {
+			return nil, policyErr
+		})},
+		Credential: credential.NewCredentialProvider(nil, nil, &staticTokenResolver{}, nil),
+		Config:     &core.CliConfig{AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu},
+	}
+
+	_, err := ac.DoStream(context.Background(), &larkcore.ApiReq{
+		HttpMethod: http.MethodGet,
+		ApiPath:    "/open-apis/drive/v1/files/file_token/download",
+	}, core.AsBot)
+	problem, ok := errs.ProblemOf(err)
+	if !ok || problem.Category != errs.CategoryPolicy || problem.Subtype != errs.SubtypeAccessDenied {
+		t.Fatalf("DoStream() problem = %#v, %v; want policy/access_denied", problem, ok)
+	}
+	if !errors.Is(err, policyErr) {
+		t.Fatal("DoStream() did not preserve the typed transport error")
+	}
+}
+
 // failingTokenResolver always returns TokenUnavailableError, exercising the
 // auth/credential failure path through resolveAccessToken.
 type failingTokenResolver struct{}
@@ -544,7 +555,7 @@ func (f *failingTokenResolver) ResolveToken(_ context.Context, spec credential.T
 func TestResolveAccessToken_NoToken_ReturnsTypedAuthenticationError(t *testing.T) {
 	ac := &APIClient{
 		HTTP:       &http.Client{},
-		Credential: newClientTestCredentialProvider("test-app", &failingTokenResolver{}),
+		Credential: credential.NewCredentialProvider(nil, nil, &failingTokenResolver{}, nil),
 		Config:     &core.CliConfig{AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu},
 	}
 
@@ -584,7 +595,7 @@ func (f *needAuthTokenResolver) ResolveToken(_ context.Context, _ credential.Tok
 func TestResolveAccessToken_NeedAuthorization_SurfacesAsTypedAuthentication(t *testing.T) {
 	ac := &APIClient{
 		HTTP:       &http.Client{},
-		Credential: newClientTestCredentialProvider("test-app", &needAuthTokenResolver{userOpenID: "ou_test_user"}),
+		Credential: credential.NewCredentialProvider(nil, nil, &needAuthTokenResolver{userOpenID: "ou_test_user"}, nil),
 		Config:     &core.CliConfig{AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu},
 	}
 
@@ -624,7 +635,7 @@ func TestResolveAccessToken_NeedAuthorization_SurfacesAsTypedAuthentication(t *t
 func TestDoSDKRequest_AuthFailureSurfacesTypedAuthenticationError(t *testing.T) {
 	ac := &APIClient{
 		HTTP:       &http.Client{},
-		Credential: newClientTestCredentialProvider("test-app", &failingTokenResolver{}),
+		Credential: credential.NewCredentialProvider(nil, nil, &failingTokenResolver{}, nil),
 		Config:     &core.CliConfig{AppID: "test-app", AppSecret: "test-secret", Brand: core.BrandFeishu},
 	}
 

internal/cmdutil/factory.go

@@ -16,10 +16,12 @@ import (
 	"github.com/larksuite/cli/errs"
 	extcred "github.com/larksuite/cli/extension/credential"
 	"github.com/larksuite/cli/extension/fileio"
+	exttransport "github.com/larksuite/cli/extension/transport"
 	"github.com/larksuite/cli/internal/client"
 	"github.com/larksuite/cli/internal/core"
 	"github.com/larksuite/cli/internal/credential"
 	"github.com/larksuite/cli/internal/keychain"
+	"github.com/larksuite/cli/internal/transport"
 )
 
 // Factory holds shared dependencies injected into every command.
@@ -27,16 +29,11 @@ import (
 // In tests, replace any field to stub out external dependencies.
 type InvocationContext struct {
 	Profile string
-	// ProfileFromFlag is true when Profile was set via the --profile flag,
-	// and false when it came from the LARKSUITE_CLI_PROFILE env fallback
-	// (or neither was set). Downstream credential resolution uses this to
-	// report the correct profile source.
-	ProfileFromFlag bool
 }
 
 type Factory struct {
 	Config     func() (*core.CliConfig, error) // lazily loads app config from Credential
-	HttpClient func() (*http.Client, error)    // HTTP client for non-Lark API calls (with retry and security headers)
+	HttpClient func() (*http.Client, error)    // policy-routed HTTP client for direct requests
 	LarkClient func() (*lark.Client, error)    // Lark SDK client for all Open API calls
 	IOStreams  *IOStreams                      // stdin/stdout/stderr streams
 
@@ -53,6 +50,18 @@ type Factory struct {
 	SkillContent fs.FS // embedded skill tree (rooted at the skill list); nil when the build embeds no skills
 }
 
+// ExternalHTTPClient returns a clone of the existing Factory client whose
+// requests are explicitly classified as external. The underlying client,
+// redirect policy, timeout, proxy configuration, and legacy transport provider
+// behavior are preserved.
+func (f *Factory) ExternalHTTPClient() (*http.Client, error) {
+	client, err := f.HttpClient()
+	if err != nil {
+		return nil, err
+	}
+	return transport.ClientForRequestClass(client, exttransport.RequestClassExternal), nil
+}
+
 // ResolveFileIO resolves a FileIO instance using the current execution context.
 // The provider controls whether the returned instance is fresh or cached.
 func (f *Factory) ResolveFileIO(ctx context.Context) fileio.FileIO {

internal/cmdutil/factory_default.go

@@ -5,16 +5,18 @@ package cmdutil
 
 import (
 	"context"
-	"fmt"
 	"io"
 	"net/http"
+	"net/url"
 	"os"
+	"strings"
 	"sync"
 	"time"
 
 	lark "github.com/larksuite/oapi-sdk-go/v3"
 	larkcore "github.com/larksuite/oapi-sdk-go/v3/core"
 
+	"github.com/larksuite/cli/errs"
 	extcred "github.com/larksuite/cli/extension/credential"
 	"github.com/larksuite/cli/extension/fileio"
 	"github.com/larksuite/cli/internal/auth"
@@ -48,6 +50,19 @@ func NewDefault(streams *IOStreams, inv InvocationContext) *Factory {
 	// workspace-scoped. Default is WorkspaceLocal — existing behavior unchanged.
 	ws := core.DetectWorkspaceFromEnv(os.Getenv)
 	core.SetCurrentWorkspace(ws)
+	workspaceConfig := core.NewConfigSnapshot()
+	bootstrapHostSignalSource := sync.OnceValue(func() riskcontrol.Source {
+		return resolveSDKHostSignalSource(workspaceConfig)
+	})
+	// Install after workspace selection so the dependency bootstrap bridge uses
+	// the correct shared proxy configuration. NewDefault is also used by cmd.Build
+	// consumers, so this keeps their request routing identical to cmd.Execute.
+	transport.InstallSDKTransportBridge(func(base http.RoundTripper) http.RoundTripper {
+		return buildSDKPlatformTransportWithBase(
+			base,
+			bootstrapHostSignalSource(),
+		)
+	})
 
 	// Inject workspace-aware dir into keychain's log system.
 	// This breaks the core↔keychain import cycle by using a function variable.
@@ -55,7 +70,6 @@ func NewDefault(streams *IOStreams, inv InvocationContext) *Factory {
 
 	// Phase 0: FileIO provider (no dependency)
 	f.FileIOProvider = fileio.GetProvider()
-	workspaceConfig := core.NewConfigSnapshot()
 
 	// Phase 1: HttpClient (no credential dependency)
 	f.HttpClient = cachedHttpClientFunc(f, workspaceConfig)
@@ -63,11 +77,10 @@ func NewDefault(streams *IOStreams, inv InvocationContext) *Factory {
 	// Phase 2: Credential (sole data source)
 	// Keychain is read via closure so callers can replace f.Keychain after construction.
 	f.Credential = buildCredentialProvider(credentialDeps{
-		Keychain:        func() keychain.KeychainAccess { return f.Keychain },
-		Profile:         inv.Profile,
-		ProfileFromFlag: inv.ProfileFromFlag,
-		HttpClient:      f.HttpClient,
-		ErrOut:          f.IOStreams.ErrOut,
+		Keychain:   func() keychain.KeychainAccess { return f.Keychain },
+		Profile:    inv.Profile,
+		HttpClient: f.HttpClient,
+		ErrOut:     f.IOStreams.ErrOut,
 	})
 
 	// Phase 3: Runtime config contains resolved account data only.
@@ -88,15 +101,45 @@ func NewDefault(streams *IOStreams, inv InvocationContext) *Factory {
 	return f
 }
 
-// safeRedirectPolicy prevents credential headers from being forwarded
-// when a response redirects to a different host (e.g. Lark API 302 → CDN).
-// Strips Authorization, X-Lark-MCP-UAT, and X-Lark-MCP-TAT on cross-host
-// redirects; other headers like X-Cli-* pass through.
+// safeRedirectPolicy permits cross-origin redirects only for bodyless GET and
+// HEAD requests. This allows API download redirects while preventing OAuth or
+// other credential-bearing request bodies from being replayed to another
+// origin. HTTPS requests can never be downgraded to HTTP.
 func safeRedirectPolicy(req *http.Request, via []*http.Request) error {
 	if len(via) >= 10 {
-		return fmt.Errorf("too many redirects")
+		return errs.NewNetworkError(errs.SubtypeNetworkTransport, "too many redirects")
 	}
-	if len(via) > 0 && req.URL.Host != via[0].URL.Host {
+	if len(via) == 0 {
+		return nil
+	}
+	original := via[0]
+	previous := via[len(via)-1]
+	if previous.URL != nil && req.URL != nil && strings.EqualFold(previous.URL.Scheme, "https") && !strings.EqualFold(req.URL.Scheme, "https") {
+		return errs.NewSecurityPolicyError(
+			errs.SubtypeAccessDenied,
+			"redirect from HTTPS to %s is not allowed",
+			req.URL.Scheme,
+		)
+	}
+	if !sameRedirectOrigin(previous.URL, req.URL) {
+		if req.Method != http.MethodGet && req.Method != http.MethodHead {
+			return errs.NewSecurityPolicyError(
+				errs.SubtypeAccessDenied,
+				"cross-origin redirect for HTTP method %s is not allowed",
+				req.Method,
+			)
+		}
+		if req.Body != nil || req.GetBody != nil {
+			return errs.NewSecurityPolicyError(
+				errs.SubtypeAccessDenied,
+				"cross-origin redirect with a request body is not allowed",
+			)
+		}
+	}
+	// net/http copies initial headers onto every redirect request. Continue
+	// stripping credentials for every hop outside the initial origin, even when
+	// two consecutive redirect targets share an origin.
+	if !sameRedirectOrigin(original.URL, req.URL) {
 		req.Header.Del("Authorization")
 		req.Header.Del("X-Lark-MCP-UAT")
 		req.Header.Del("X-Lark-MCP-TAT")
@@ -104,6 +147,29 @@ func safeRedirectPolicy(req *http.Request, via []*http.Request) error {
 	return nil
 }
 
+func sameRedirectOrigin(left, right *url.URL) bool {
+	if left == nil || right == nil {
+		return false
+	}
+	return strings.EqualFold(left.Scheme, right.Scheme) &&
+		strings.EqualFold(left.Hostname(), right.Hostname()) &&
+		effectivePort(left) == effectivePort(right)
+}
+
+func effectivePort(candidate *url.URL) string {
+	if port := candidate.Port(); port != "" {
+		return port
+	}
+	switch strings.ToLower(candidate.Scheme) {
+	case "http":
+		return "80"
+	case "https":
+		return "443"
+	default:
+		return ""
+	}
+}
+
 // warnIfProxied is a test seam for the proxy-warning gate. Production wires it
 // to transport.WarnIfProxied; tests swap in a spy to count invocations. It is
 // needed because the real function is guarded by an internal sync.Once, so
@@ -119,15 +185,12 @@ func cachedHttpClientFunc(f *Factory, workspaceConfig workspaceConfigSource) fun
 		}
 
 		hostSignalSource := resolveSDKHostSignalSource(workspaceConfig)
-
-		var rt http.RoundTripper = transport.Shared()
-		rt = riskcontrol.NewTransport(rt, hostSignalSource)
-		rt = &RetryTransport{Base: rt}
-		rt = &SecurityHeaderTransport{Base: rt}
-		rt = &auth.SecurityPolicyTransport{Base: rt} // Add our global response interceptor
-		rt = wrapWithExtension(rt)
+		shared := transport.Shared()
+		outbound := riskcontrol.NewTransport(shared, hostSignalSource)
+		platform := buildDirectHTTPTransport(outbound, true)
+		external := buildDirectHTTPTransport(outbound, false)
 		client := &http.Client{
-			Transport:     rt,
+			Transport:     transport.NewHTTPPolicyRouter(platform, external),
 			Timeout:       30 * time.Second,
 			CheckRedirect: safeRedirectPolicy,
 		}
@@ -135,6 +198,15 @@ func cachedHttpClientFunc(f *Factory, workspaceConfig workspaceConfigSource) fun
 	})
 }
 
+func buildDirectHTTPTransport(base http.RoundTripper, platform bool) http.RoundTripper {
+	var builtIn http.RoundTripper = &RetryTransport{Base: base}
+	builtIn = &SecurityHeaderTransport{Base: builtIn}
+	if platform {
+		builtIn = &auth.SecurityPolicyTransport{Base: builtIn}
+	}
+	return builtIn
+}
+
 func cachedLarkClientFunc(f *Factory, workspaceConfig workspaceConfigSource) func() (*lark.Client, error) {
 	return sync.OnceValues(func() (*lark.Client, error) {
 		acct, err := f.Credential.ResolveAccount(context.Background())
@@ -150,14 +222,8 @@ func cachedLarkClientFunc(f *Factory, workspaceConfig workspaceConfigSource) fun
 			warnIfProxied(f.IOStreams.ErrOut)
 		}
 		hostSignalSource := resolveSDKHostSignalSource(workspaceConfig)
-		var sdkBase http.RoundTripper = transport.Shared()
-		// The innermost SDK boundary always strips reserved host-signal headers;
-		// a nil source makes it strip-only when workspace policy disables signal
-		// collection.
-		sdkBase = riskcontrol.NewTransport(sdkBase, hostSignalSource)
-		sdkTransport := wrapSDKTransport(sdkBase)
 		opts = append(opts, lark.WithHttpClient(&http.Client{
-			Transport:     sdkTransport,
+			Transport:     buildSDKTransport(hostSignalSource),
 			CheckRedirect: safeRedirectPolicy,
 		}))
 		ep := core.ResolveEndpoints(acct.Brand)
@@ -166,20 +232,48 @@ func cachedLarkClientFunc(f *Factory, workspaceConfig workspaceConfigSource) fun
 	})
 }
 
-func wrapSDKTransport(next http.RoundTripper) http.RoundTripper {
-	var sdkTransport http.RoundTripper = &RetryTransport{Base: next}
-	sdkTransport = &UserAgentTransport{Base: sdkTransport}
-	sdkTransport = &BuildHeaderTransport{Base: sdkTransport}
-	sdkTransport = &auth.SecurityPolicyTransport{Base: sdkTransport}
-	return wrapWithExtension(sdkTransport)
+func buildSDKTransport(hostSignalSource riskcontrol.Source) http.RoundTripper {
+	return buildSDKTransportWithBase(transport.Shared(), hostSignalSource)
+}
+
+func buildSDKPlatformTransportWithBase(
+	base http.RoundTripper,
+	hostSignalSource riskcontrol.Source,
+) http.RoundTripper {
+	outbound := riskcontrol.NewTransport(base, hostSignalSource)
+	return buildSDKHTTPTransport(outbound, true)
+}
+
+func buildSDKTransportWithBase(
+	base http.RoundTripper,
+	hostSignalSource riskcontrol.Source,
+) http.RoundTripper {
+	// Risk control is the innermost trusted boundary for both request classes.
+	// It therefore observes the final URL and strips extension-supplied reserved
+	// headers immediately before the network transport.
+	outbound := riskcontrol.NewTransport(base, hostSignalSource)
+	return transport.NewHTTPPolicyRouter(
+		buildSDKHTTPTransport(outbound, true),
+		buildSDKHTTPTransport(outbound, false),
+	)
+}
+
+func buildSDKHTTPTransport(base http.RoundTripper, platform bool) http.RoundTripper {
+	var builtIn http.RoundTripper = &RetryTransport{Base: base}
+	builtIn = &UserAgentTransport{Base: builtIn}
+	builtIn = &BuildHeaderTransport{Base: builtIn}
+	builtIn = &SecurityHeaderTransport{Base: builtIn}
+	if platform {
+		builtIn = &auth.SecurityPolicyTransport{Base: builtIn}
+	}
+	return builtIn
 }
 
 type credentialDeps struct {
-	Keychain        func() keychain.KeychainAccess
-	Profile         string
-	ProfileFromFlag bool
-	HttpClient      func() (*http.Client, error)
-	ErrOut          io.Writer
+	Keychain   func() keychain.KeychainAccess
+	Profile    string
+	HttpClient func() (*http.Client, error)
+	ErrOut     io.Writer
 }
 
 func buildCredentialProvider(deps credentialDeps) *credential.CredentialProvider {
@@ -192,13 +286,5 @@ func buildCredentialProvider(deps credentialDeps) *credential.CredentialProvider
 	// depend on. enrichUserInfo failures are already non-fatal (the
 	// provider clears unverified identity fields), so silencing the
 	// warning is safe.
-	cred := credential.NewCredentialProvider(providers, defaultAcct, defaultToken, deps.HttpClient)
-	if deps.Profile == "" {
-		// No profile selected — don't record a phantom env source.
-		return cred
-	}
-	if deps.ProfileFromFlag {
-		return cred.WithProfileFromFlag(deps.Profile)
-	}
-	return cred.WithProfileFromEnv(deps.Profile)
+	return credential.NewCredentialProvider(providers, defaultAcct, defaultToken, deps.HttpClient)
 }

internal/cmdutil/factory_http_test.go

@@ -4,13 +4,20 @@
 package cmdutil
 
 import (
+	"errors"
 	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
 	"testing"
 
+	"github.com/larksuite/cli/errs"
+	exttransport "github.com/larksuite/cli/extension/transport"
 	"github.com/larksuite/cli/internal/core"
+	internaltransport "github.com/larksuite/cli/internal/transport"
 )
 
-func TestCachedHttpClientFunc_ReturnsSameInstance(t *testing.T) {
+func TestCachedHTTPClientFunc_ReturnsSameInstance(t *testing.T) {
 	isEnabled := false
 	f, _, _, _ := TestFactory(t, &core.CliConfig{AppID: "test-app"})
 	f.IOStreams.ErrOut = io.Discard
@@ -33,7 +40,7 @@ func TestCachedHttpClientFunc_ReturnsSameInstance(t *testing.T) {
 	}
 }
 
-func TestCachedHttpClientFunc_HasTimeout(t *testing.T) {
+func TestCachedHTTPClientFunc_HasTimeout(t *testing.T) {
 	isEnabled := false
 	f, _, _, _ := TestFactory(t, &core.CliConfig{AppID: "test-app"})
 	f.IOStreams.ErrOut = io.Discard
@@ -44,7 +51,7 @@ func TestCachedHttpClientFunc_HasTimeout(t *testing.T) {
 	}
 }
 
-func TestCachedHttpClientFunc_HasRedirectPolicy(t *testing.T) {
+func TestCachedHTTPClientFunc_HasRedirectPolicy(t *testing.T) {
 	isEnabled := false
 	f, _, _, _ := TestFactory(t, &core.CliConfig{AppID: "test-app"})
 	f.IOStreams.ErrOut = io.Discard
@@ -54,3 +61,283 @@ func TestCachedHttpClientFunc_HasRedirectPolicy(t *testing.T) {
 		t.Error("expected CheckRedirect to be set (safeRedirectPolicy)")
 	}
 }
+
+func TestFactoryExternalHTTPClientClonesExistingClient(t *testing.T) {
+	base := &http.Client{Timeout: 17, CheckRedirect: safeRedirectPolicy}
+	factory := &Factory{HttpClient: func() (*http.Client, error) { return base, nil }}
+
+	external, err := factory.ExternalHTTPClient()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if external == base {
+		t.Fatal("ExternalHTTPClient returned the cached client instead of a clone")
+	}
+	if external.Timeout != base.Timeout || external.CheckRedirect == nil {
+		t.Fatal("ExternalHTTPClient did not preserve client policy")
+	}
+	if base.Transport != nil {
+		t.Fatal("ExternalHTTPClient mutated the cached client's transport")
+	}
+}
+
+type platformOnlyStubProvider struct {
+	*stubTransportProvider
+}
+
+func (*platformOnlyStubProvider) SupportsRequestClass(class exttransport.RequestClass) bool {
+	return class == exttransport.RequestClassPlatform
+}
+
+func TestFactoryHTTPClientRoutesPoliciesByRequestClass(t *testing.T) {
+	t.Setenv("LARKSUITE_CLI_NO_PROXY", "1")
+
+	interceptor := &headerCapturingInterceptor{}
+	exttransport.Register(&platformOnlyStubProvider{stubTransportProvider: &stubTransportProvider{interceptor: interceptor}})
+	t.Cleanup(func() { exttransport.Register(nil) })
+
+	received := make(chan http.Header, 2)
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		received <- req.Header.Clone()
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(server.Close)
+
+	factory := &Factory{IOStreams: &IOStreams{ErrOut: io.Discard}}
+	client, err := cachedHttpClientFunc(factory, nil)()
+	if err != nil {
+		t.Fatal(err)
+	}
+	factory.HttpClient = func() (*http.Client, error) { return client, nil }
+	platformClient := internaltransport.ClientForRequestClass(client, exttransport.RequestClassPlatform)
+	externalClient, err := factory.ExternalHTTPClient()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, client := range []*http.Client{platformClient, externalClient} {
+		resp, err := client.Get(server.URL)
+		if err != nil {
+			t.Fatal(err)
+		}
+		resp.Body.Close()
+	}
+
+	platformHeaders := <-received
+	if got := platformHeaders.Get("X-Custom-Trace"); got != "ext-trace-123" {
+		t.Fatalf("platform extension header = %q, want ext-trace-123", got)
+	}
+	if got := platformHeaders.Get(HeaderSource); got != SourceValue {
+		t.Fatalf("platform security header = %q, want %q", got, SourceValue)
+	}
+
+	externalHeaders := <-received
+	if got := externalHeaders.Get("X-Custom-Trace"); got != "" {
+		t.Fatalf("external request leaked extension header %q", got)
+	}
+	for header, values := range BaseSecurityHeaders() {
+		if len(values) == 0 {
+			continue
+		}
+		want := values[len(values)-1]
+		if got := externalHeaders.Get(header); got != want {
+			t.Fatalf("external security header %s = %q, want preserved value %q", header, got, want)
+		}
+	}
+}
+
+func TestFactoryExternalHTTPClientDoesNotParsePlatformErrorProtocol(t *testing.T) {
+	t.Setenv("LARKSUITE_CLI_NO_PROXY", "1")
+	exttransport.Register(nil)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		_, _ = io.WriteString(w, `{"code":21000,"msg":"application-defined external response","data":{"cli_hint":"external-defined"}}`)
+	}))
+	t.Cleanup(server.Close)
+
+	factory := &Factory{IOStreams: &IOStreams{ErrOut: io.Discard}}
+	client, err := cachedHttpClientFunc(factory, nil)()
+	if err != nil {
+		t.Fatal(err)
+	}
+	factory.HttpClient = func() (*http.Client, error) { return client, nil }
+
+	platform := internaltransport.ClientForRequestClass(client, exttransport.RequestClassPlatform)
+	if _, err := platform.Get(server.URL); err == nil {
+		t.Fatal("platform request error = nil, want security policy classification")
+	} else {
+		var policyErr *errs.SecurityPolicyError
+		if !errors.As(err, &policyErr) {
+			t.Fatalf("platform request error type = %T, want *errs.SecurityPolicyError", err)
+		}
+	}
+
+	external, err := factory.ExternalHTTPClient()
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := external.Get(server.URL)
+	if err != nil {
+		t.Fatalf("external request parsed platform error protocol: %v", err)
+	}
+	resp.Body.Close()
+}
+
+func TestSafeRedirectPolicyAllowsBodylessCrossOriginGetAndStripsCredentials(t *testing.T) {
+	original, err := http.NewRequest(http.MethodGet, "https://open.feishu.cn/start", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	redirect, err := http.NewRequest(http.MethodGet, "https://cdn.example.com/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, header := range []string{"Authorization", "X-Lark-MCP-UAT", "X-Lark-MCP-TAT"} {
+		redirect.Header.Set(header, "secret")
+	}
+
+	if err := safeRedirectPolicy(redirect, []*http.Request{original}); err != nil {
+		t.Fatalf("safeRedirectPolicy() error = %v, want allowed GET redirect", err)
+	}
+	for _, header := range []string{"Authorization", "X-Lark-MCP-UAT", "X-Lark-MCP-TAT"} {
+		if got := redirect.Header.Get(header); got != "" {
+			t.Fatalf("redirect retained %s=%q", header, got)
+		}
+	}
+}
+
+func TestSafeRedirectPolicyRejectsHTTPSDowngrade(t *testing.T) {
+	original, err := http.NewRequest(http.MethodGet, "https://open.feishu.cn/start", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	redirect, err := http.NewRequest(http.MethodGet, "http://open.feishu.cn/next", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = safeRedirectPolicy(redirect, []*http.Request{original})
+	if err == nil || !strings.Contains(err.Error(), "HTTPS") {
+		t.Fatalf("safeRedirectPolicy() error = %v, want HTTPS downgrade rejection", err)
+	}
+	requireRedirectProblem(t, err, errs.CategoryPolicy, errs.SubtypeAccessDenied)
+}
+
+func TestSafeRedirectPolicyRejectsCrossOriginMethod(t *testing.T) {
+	original, err := http.NewRequest(http.MethodPost, "https://accounts.feishu.cn/token", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	redirect, err := http.NewRequest(http.MethodPost, "https://external.example/token", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = safeRedirectPolicy(redirect, []*http.Request{original})
+	if err == nil || !strings.Contains(err.Error(), "HTTP method POST") {
+		t.Fatalf("safeRedirectPolicy() error = %v, want cross-origin method rejection", err)
+	}
+	requireRedirectProblem(t, err, errs.CategoryPolicy, errs.SubtypeAccessDenied)
+}
+
+func TestSafeRedirectPolicyRejectsCrossOriginRequestBody(t *testing.T) {
+	original, err := http.NewRequest(http.MethodGet, "https://accounts.feishu.cn/token", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	redirect, err := http.NewRequest(http.MethodGet, "https://external.example/token", strings.NewReader("client_secret=secret"))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = safeRedirectPolicy(redirect, []*http.Request{original})
+	if err == nil || !strings.Contains(err.Error(), "request body") {
+		t.Fatalf("safeRedirectPolicy() error = %v, want cross-origin body rejection", err)
+	}
+	requireRedirectProblem(t, err, errs.CategoryPolicy, errs.SubtypeAccessDenied)
+}
+
+func TestSafeRedirectPolicyRejectsTooManyRedirects(t *testing.T) {
+	err := safeRedirectPolicy(&http.Request{}, make([]*http.Request, 10))
+	if err == nil || err.Error() != "too many redirects" {
+		t.Fatalf("safeRedirectPolicy() error = %v, want redirect limit rejection", err)
+	}
+	requireRedirectProblem(t, err, errs.CategoryNetwork, errs.SubtypeNetworkTransport)
+}
+
+func TestSafeRedirectPolicyTreatsDefaultHTTPSPortAsSameOrigin(t *testing.T) {
+	original, err := http.NewRequest(http.MethodPost, "https://accounts.feishu.cn/token", strings.NewReader("secret"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	redirect, err := http.NewRequest(http.MethodPost, "https://accounts.feishu.cn:443/token-next", strings.NewReader("secret"))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := safeRedirectPolicy(redirect, []*http.Request{original}); err != nil {
+		t.Fatalf("safeRedirectPolicy() error = %v, want same-origin redirect", err)
+	}
+}
+
+func TestSafeRedirectPolicyKeepsCredentialsStrippedAcrossExternalHops(t *testing.T) {
+	original, err := http.NewRequest(http.MethodGet, "https://open.feishu.cn/start", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	previous, err := http.NewRequest(http.MethodGet, "https://cdn.example.com/first", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	redirect, err := http.NewRequest(http.MethodGet, "https://cdn.example.com/second", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	redirect.Header.Set("Authorization", "Bearer copied-from-initial-request")
+
+	if err := safeRedirectPolicy(redirect, []*http.Request{original, previous}); err != nil {
+		t.Fatalf("safeRedirectPolicy() error = %v, want same-CDN redirect", err)
+	}
+	if got := redirect.Header.Get("Authorization"); got != "" {
+		t.Fatalf("redirect retained Authorization=%q outside the initial origin", got)
+	}
+}
+
+func TestSafeRedirectPolicyRejectsDowngradeOnLaterHop(t *testing.T) {
+	original, err := http.NewRequest(http.MethodGet, "http://source.example/start", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	previous, err := http.NewRequest(http.MethodGet, "https://cdn.example.com/secure", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	redirect, err := http.NewRequest(http.MethodGet, "http://cdn.example.com/plain", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = safeRedirectPolicy(redirect, []*http.Request{original, previous})
+	if err == nil || !strings.Contains(err.Error(), "HTTPS") {
+		t.Fatalf("safeRedirectPolicy() error = %v, want later-hop HTTPS downgrade rejection", err)
+	}
+	requireRedirectProblem(t, err, errs.CategoryPolicy, errs.SubtypeAccessDenied)
+}
+
+func requireRedirectProblem(t *testing.T, err error, category errs.Category, subtype errs.Subtype) {
+	t.Helper()
+	problem, ok := errs.ProblemOf(err)
+	if !ok {
+		t.Fatalf("error type = %T, want typed error", err)
+	}
+	if problem.Category != category || problem.Subtype != subtype {
+		t.Fatalf(
+			"error category/subtype = %s/%s, want %s/%s",
+			problem.Category,
+			problem.Subtype,
+			category,
+			subtype,
+		)
+	}
+}

internal/cmdutil/factory_proxy_warn_test.go

@@ -34,9 +34,9 @@ var proxyWarnGateCases = []struct {
 	{"non-terminal stderr stays silent", false, 0},
 }
 
-// TestCachedHttpClientFunc_ProxyWarnGate verifies the http-client init path
+// TestCachedHTTPClientFunc_ProxyWarnGate verifies the HTTP client init path
 // invokes WarnIfProxied only when stderr is an interactive terminal.
-func TestCachedHttpClientFunc_ProxyWarnGate(t *testing.T) {
+func TestCachedHTTPClientFunc_ProxyWarnGate(t *testing.T) {
 	isEnabled := false
 	for _, tc := range proxyWarnGateCases {
 		t.Run(tc.name, func(t *testing.T) {

internal/cmdutil/factory_test.go

@@ -13,7 +13,6 @@ import (
 
 	"github.com/larksuite/cli/errs"
 	extcred "github.com/larksuite/cli/extension/credential"
-	envprovider "github.com/larksuite/cli/extension/credential/env"
 	"github.com/larksuite/cli/internal/core"
 	"github.com/larksuite/cli/internal/credential"
 	"github.com/larksuite/cli/internal/envvars"
@@ -406,14 +405,6 @@ type stubExtProvider struct {
 	err  error
 }
 
-type stubDefaultAccountResolver struct {
-	acct *credential.Account
-}
-
-func (s *stubDefaultAccountResolver) ResolveAccount(_ context.Context) (*credential.Account, error) {
-	return s.acct, nil
-}
-
 func (s *stubExtProvider) Name() string { return s.name }
 func (s *stubExtProvider) ResolveAccount(_ context.Context) (*extcred.Account, error) {
 	return s.acct, s.err
@@ -457,86 +448,6 @@ func TestRequireBuiltinCredentialProvider_AllowsBuiltinProvider(t *testing.T) {
 	}
 }
 
-func TestRequireBuiltinCredentialProvider_AllowsMatchingAppIDOnlyProfile(t *testing.T) {
-	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
-	t.Setenv(envvars.CliAppID, "cli_a")
-	t.Setenv(envvars.CliAppSecret, "")
-	t.Setenv(envvars.CliUserAccessToken, "")
-	t.Setenv(envvars.CliTenantAccessToken, "")
-	if err := core.SaveMultiAppConfig(&core.MultiAppConfig{
-		CurrentApp: "tenant_a",
-		Apps: []core.AppConfig{{
-			Name:      "tenant_a",
-			AppId:     "cli_a",
-			AppSecret: core.PlainSecret("test-secret"),
-			Brand:     core.BrandFeishu,
-		}},
-	}); err != nil {
-		t.Fatalf("SaveMultiAppConfig: %v", err)
-	}
-
-	cred := credential.NewCredentialProvider(
-		[]extcred.Provider{&envprovider.Provider{}},
-		&stubDefaultAccountResolver{acct: &credential.Account{AppID: "cli_a", AppSecret: "test-secret"}},
-		nil,
-		nil,
-	).WithProfileFromFlag("tenant_a")
-	f, _, _, _ := TestFactory(t, nil)
-	f.Credential = cred
-
-	if err := f.RequireBuiltinCredentialProvider(context.Background(), "auth"); err != nil {
-		t.Fatalf("matching APP_ID-only profile should use builtin credentials: %v", err)
-	}
-}
-
-// A stale LARKSUITE_CLI_PROFILE (profile that cannot resolve) must not lock
-// the user out of the builtin setup/repair commands this gate guards: the
-// probe falls back to provider engagement and lets the command run.
-func TestRequireBuiltinCredentialProvider_StaleProfileDoesNotLockOut(t *testing.T) {
-	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir()) // no config -> "ghost" cannot resolve
-
-	stub := &stubExtProvider{name: "env"} // not engaged: returns nil, nil
-	cred := credential.NewCredentialProvider(
-		[]extcred.Provider{stub},
-		&stubDefaultAccountResolver{},
-		nil,
-		nil,
-	).WithProfileFromEnv("ghost")
-	f, _, _, _ := TestFactory(t, nil)
-	f.Credential = cred
-
-	if err := f.RequireBuiltinCredentialProvider(context.Background(), "config"); err != nil {
-		t.Fatalf("stale profile must not lock out builtin auth/config commands: %v", err)
-	}
-}
-
-// An invalid policy variable (e.g. LARKSUITE_CLI_DEFAULT_AS=banana) is a user
-// input error, not an external credential takeover: the gate surfaces the
-// same typed validation error as formal arbitration instead of a misleading
-// "provided externally" refusal.
-func TestRequireBuiltinCredentialProvider_InvalidPolicySurfacesTypedError(t *testing.T) {
-	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
-
-	stub := &stubExtProvider{name: "env", err: &extcred.BlockError{
-		Provider: "env",
-		Reason:   "invalid LARKSUITE_CLI_DEFAULT_AS \"banana\" (want user, bot, or auto)",
-		Code:     extcred.BlockReasonInvalidPolicy,
-		Param:    envvars.CliDefaultAs,
-	}}
-	cred := credential.NewCredentialProvider([]extcred.Provider{stub}, &stubDefaultAccountResolver{}, nil, nil)
-	f, _, _, _ := TestFactory(t, nil)
-	f.Credential = cred
-
-	err := f.RequireBuiltinCredentialProvider(context.Background(), "auth")
-	prob, ok := errs.ProblemOf(err)
-	if !ok || prob.Subtype != errs.SubtypeInvalidArgument {
-		t.Fatalf("err = %v, want typed invalid_argument (same as formal arbitration)", err)
-	}
-	if strings.Contains(err.Error(), "provided externally") {
-		t.Fatalf("err = %v, must not read as external takeover", err)
-	}
-}
-
 func TestRequireBuiltinCredentialProvider_NilCredential(t *testing.T) {
 	f, _, _, _ := TestFactory(t, nil)
 	f.Credential = nil

internal/cmdutil/secheader.go

@@ -26,6 +26,7 @@ const (
 	HeaderShortcut    = "X-Cli-Shortcut"
 	HeaderExecutionId = "X-Cli-Execution-Id"
 	HeaderAgentTrace  = "X-Agent-Trace"
+	HeaderAgentName   = "X-Agent-Name"
 
 	SourceValue = "lark-cli"
 
@@ -55,6 +56,9 @@ func BaseSecurityHeaders() http.Header {
 	if v := envvars.AgentTrace(); v != "" {
 		h.Set(HeaderAgentTrace, v)
 	}
+	if v := envvars.AgentName(); v != "" {
+		h.Set(HeaderAgentName, v)
+	}
 	return h
 }
 

internal/cmdutil/secheader_test.go

@@ -263,9 +263,34 @@ func TestBaseSecurityHeaders_AllRequiredHeaders(t *testing.T) {
 }
 
 // ---------------------------------------------------------------------------
-// HeaderAgentTrace injection (via BaseSecurityHeaders)
+// Agent headers injected via BaseSecurityHeaders
 // ---------------------------------------------------------------------------
 
+func TestBaseSecurityHeaders_NoAgentNameHeaderWhenEnvUnset(t *testing.T) {
+	t.Setenv(envvars.CliAgentName, "")
+	h := BaseSecurityHeaders()
+	if v := h.Get(HeaderAgentName); v != "" {
+		t.Fatalf("BaseSecurityHeaders() included %s = %q, want absent when env unset", HeaderAgentName, v)
+	}
+}
+
+func TestBaseSecurityHeaders_IncludesAgentNameHeaderWhenEnvSet(t *testing.T) {
+	const agentName = "sample-agent"
+	t.Setenv(envvars.CliAgentName, agentName)
+	h := BaseSecurityHeaders()
+	if v := h.Get(HeaderAgentName); v != agentName {
+		t.Fatalf("BaseSecurityHeaders()[%s] = %q, want %q", HeaderAgentName, v, agentName)
+	}
+}
+
+func TestBaseSecurityHeaders_NoAgentNameHeaderWhenEnvInvalid(t *testing.T) {
+	t.Setenv(envvars.CliAgentName, "agent\r\nX-Evil: attack")
+	h := BaseSecurityHeaders()
+	if v := h.Get(HeaderAgentName); v != "" {
+		t.Fatalf("BaseSecurityHeaders() included %s = %q, want absent for invalid input", HeaderAgentName, v)
+	}
+}
+
 func TestBaseSecurityHeaders_NoAgentTraceHeaderWhenEnvUnset(t *testing.T) {
 	t.Setenv(envvars.CliAgentTrace, "")
 	h := BaseSecurityHeaders()

internal/cmdutil/testing_test.go

@@ -46,7 +46,7 @@ func TestTestFactory_ReplacesGlobals(t *testing.T) {
 		URL:  "/test",
 		Body: "ok",
 	})
-	// Use the stub via Factory HttpClient
+	// Use the stub via Factory HttpClient.
 	httpClient, err := f.HttpClient()
 	if err != nil {
 		t.Fatalf("HttpClient() error: %v", err)

internal/cmdutil/transport.go

@@ -4,14 +4,19 @@
 package cmdutil
 
 import (
-	"context"
 	"net/http"
 	"time"
 
-	exttransport "github.com/larksuite/cli/extension/transport"
 	"github.com/larksuite/cli/internal/transport"
 )
 
+var (
+	_ transport.RoundTripperDecorator = (*RetryTransport)(nil)
+	_ transport.RoundTripperDecorator = (*UserAgentTransport)(nil)
+	_ transport.RoundTripperDecorator = (*BuildHeaderTransport)(nil)
+	_ transport.RoundTripperDecorator = (*SecurityHeaderTransport)(nil)
+)
+
 // RetryTransport is an http.RoundTripper that retries on 5xx responses
 // and network errors. MaxRetries defaults to 0 (no retries).
 type RetryTransport struct {
@@ -27,6 +32,16 @@ func (t *RetryTransport) base() http.RoundTripper {
 	return transport.Fallback()
 }
 
+func (t *RetryTransport) BaseRoundTripper() http.RoundTripper {
+	return t.base()
+}
+
+func (t *RetryTransport) WithBaseRoundTripper(base http.RoundTripper) http.RoundTripper {
+	cloned := *t
+	cloned.Base = base
+	return &cloned
+}
+
 func (t *RetryTransport) delay() time.Duration {
 	if t.Delay > 0 {
 		return t.Delay
@@ -63,6 +78,19 @@ type UserAgentTransport struct {
 	Base http.RoundTripper
 }
 
+func (t *UserAgentTransport) BaseRoundTripper() http.RoundTripper {
+	if t.Base != nil {
+		return t.Base
+	}
+	return transport.Fallback()
+}
+
+func (t *UserAgentTransport) WithBaseRoundTripper(base http.RoundTripper) http.RoundTripper {
+	cloned := *t
+	cloned.Base = base
+	return &cloned
+}
+
 func (t *UserAgentTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	req = req.Clone(req.Context())
 	req.Header.Set(HeaderUserAgent, UserAgentValue())
@@ -73,14 +101,25 @@ func (t *UserAgentTransport) RoundTrip(req *http.Request) (*http.Response, error
 }
 
 // BuildHeaderTransport is an http.RoundTripper that force-writes the
-// X-Cli-Build header before every request. Used in the SDK transport chain,
-// where SecurityHeaderTransport is not installed, to prevent extensions from
-// tampering with the build classification. The direct HTTP chain is already
-// covered by SecurityHeaderTransport iterating BaseSecurityHeaders.
+// X-Cli-Build header before every request. It remains in the SDK transport
+// chain as a narrow defense-in-depth layer alongside SecurityHeaderTransport.
 type BuildHeaderTransport struct {
 	Base http.RoundTripper
 }
 
+func (t *BuildHeaderTransport) BaseRoundTripper() http.RoundTripper {
+	if t.Base != nil {
+		return t.Base
+	}
+	return transport.Fallback()
+}
+
+func (t *BuildHeaderTransport) WithBaseRoundTripper(base http.RoundTripper) http.RoundTripper {
+	cloned := *t
+	cloned.Base = base
+	return &cloned
+}
+
 func (t *BuildHeaderTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	req = req.Clone(req.Context())
 	req.Header.Set(HeaderBuild, DetectBuildKind())
@@ -103,6 +142,16 @@ func (t *SecurityHeaderTransport) base() http.RoundTripper {
 	return transport.Fallback()
 }
 
+func (t *SecurityHeaderTransport) BaseRoundTripper() http.RoundTripper {
+	return t.base()
+}
+
+func (t *SecurityHeaderTransport) WithBaseRoundTripper(base http.RoundTripper) http.RoundTripper {
+	cloned := *t
+	cloned.Base = base
+	return &cloned
+}
+
 // RoundTrip implements http.RoundTripper.
 func (t *SecurityHeaderTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	req = req.Clone(req.Context())
@@ -120,67 +169,3 @@ func (t *SecurityHeaderTransport) RoundTrip(req *http.Request) (*http.Response,
 	}
 	return t.base().RoundTrip(req)
 }
-
-// extensionMiddleware wraps the built-in transport chain with pre/post hooks.
-// The built-in chain always executes unless the extension is an
-// exttransport.AbortableInterceptor and its PreRoundTripE returns a non-nil
-// error; it cannot otherwise be skipped or overridden.
-//
-// The original request context is restored after the pre hook to prevent
-// extensions from tampering with cancellation, deadlines, or built-in values.
-// Cloning the request isolates header/URL/etc. mutations from the caller's
-// request object; req.Body is intentionally shared — extensions that consume
-// it are responsible for rewinding (see Interceptor doc).
-type extensionMiddleware struct {
-	Base    http.RoundTripper
-	Ext     exttransport.Interceptor
-	ExtName string // Provider.Name(), captured at wrap time for *AbortError.Extension
-}
-
-// RoundTrip invokes the interceptor pre hook, restores the original context,
-// executes the built-in chain (unless aborted), then calls the post hook if
-// non-nil. When the extension implements AbortableInterceptor and returns a
-// non-nil error from PreRoundTripE, the built-in chain is skipped and an
-// *exttransport.AbortError is returned; the post hook is still invoked with
-// (nil, reason) so extensions can unwind resources.
-func (m *extensionMiddleware) RoundTrip(req *http.Request) (*http.Response, error) {
-	origCtx := req.Context()
-	req = req.Clone(origCtx)
-
-	var (
-		post    func(*http.Response, error)
-		abortEr error
-	)
-	if a, ok := m.Ext.(exttransport.AbortableInterceptor); ok {
-		post, abortEr = a.PreRoundTripE(req)
-	} else {
-		post = m.Ext.PreRoundTrip(req)
-	}
-	if abortEr != nil {
-		if post != nil {
-			post(nil, abortEr)
-		}
-		return nil, &exttransport.AbortError{Extension: m.ExtName, Reason: abortEr}
-	}
-
-	req = req.WithContext(origCtx) // restore original context
-	resp, err := m.Base.RoundTrip(req)
-	if post != nil {
-		post(resp, err)
-	}
-	return resp, err
-}
-
-// wrapWithExtension wraps transport with the registered extension middleware.
-// If no extension is registered, returns transport unchanged.
-func wrapWithExtension(transport http.RoundTripper) http.RoundTripper {
-	p := exttransport.GetProvider()
-	if p == nil {
-		return transport
-	}
-	tr := p.ResolveInterceptor(context.Background())
-	if tr == nil {
-		return transport
-	}
-	return &extensionMiddleware{Base: transport, Ext: tr, ExtName: p.Name()}
-}

internal/cmdutil/transport_test.go

@@ -14,8 +14,8 @@ import (
 	"time"
 
 	exttransport "github.com/larksuite/cli/extension/transport"
-	internalauth "github.com/larksuite/cli/internal/auth"
 	"github.com/larksuite/cli/internal/riskcontrol"
+	internaltransport "github.com/larksuite/cli/internal/transport"
 )
 
 type roundTripFunc func(*http.Request) (*http.Response, error)
@@ -91,94 +91,107 @@ func TestRetryTransport_DefaultNoRetry(t *testing.T) {
 	}
 }
 
-// ---------------------------------------------------------------------------
-// wrapSDKTransport chain composition
+// buildSDKTransport policy behavior
 // ---------------------------------------------------------------------------
 
-func TestWrapSDKTransport_IncludesRetryTransport(t *testing.T) {
-	transport := wrapSDKTransport(riskcontrol.NewTransport(http.DefaultTransport, nil))
+func TestBuildSDKTransportAppliesSecurityHeadersToEveryRequestClass(t *testing.T) {
+	exttransport.Register(nil)
+	received := make(chan http.Header, 2)
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		received <- req.Header.Clone()
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(server.Close)
 
-	// Chain: SecurityPolicy → BuildHeader → UserAgent → Retry → RiskControl → Base
-	sec, ok := transport.(*internalauth.SecurityPolicyTransport)
-	if !ok {
-		t.Fatalf("outer transport type = %T, want *auth.SecurityPolicyTransport", transport)
-	}
-	bh, ok := sec.Base.(*BuildHeaderTransport)
-	if !ok {
-		t.Fatalf("layer after SecurityPolicy = %T, want *BuildHeaderTransport", sec.Base)
-	}
-	ua, ok := bh.Base.(*UserAgentTransport)
-	if !ok {
-		t.Fatalf("layer after BuildHeader = %T, want *UserAgentTransport", bh.Base)
-	}
-	retry, ok := ua.Base.(*RetryTransport)
-	if !ok {
-		t.Fatalf("inner transport type = %T, want *RetryTransport", ua.Base)
-	}
-	if _, ok := retry.Base.(*riskcontrol.Transport); !ok {
-		t.Fatalf("layer after Retry = %T, want *riskcontrol.Transport", retry.Base)
+	for _, class := range []exttransport.RequestClass{
+		exttransport.RequestClassPlatform,
+		exttransport.RequestClassExternal,
+	} {
+		client := internaltransport.ClientForRequestClass(
+			&http.Client{Transport: buildSDKTransport(nil)},
+			class,
+		)
+		resp, err := client.Get(server.URL)
+		if err != nil {
+			t.Fatal(err)
+		}
+		resp.Body.Close()
+
+		headers := <-received
+		for header, values := range BaseSecurityHeaders() {
+			if len(values) == 0 {
+				continue
+			}
+			want := values[len(values)-1]
+			if got := headers.Get(header); got != want {
+				t.Fatalf("SDK %s header %s = %q, want %q", class, header, got, want)
+			}
+		}
 	}
 }
 
-func TestWrapSDKTransport_WithExtension(t *testing.T) {
+func TestBuildSDKTransport_WithExtension(t *testing.T) {
 	previous := exttransport.GetProvider()
-	exttransport.Register(&stubTransportProvider{})
+	interceptor := &headerCapturingInterceptor{}
+	exttransport.Register(&platformOnlyStubProvider{
+		stubTransportProvider: &stubTransportProvider{interceptor: interceptor},
+	})
 	t.Cleanup(func() { exttransport.Register(previous) })
 
-	transport := wrapSDKTransport(riskcontrol.NewTransport(http.DefaultTransport, nil))
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(server.Close)
 
-	// Chain: extensionMiddleware → SecurityPolicy → BuildHeader → UserAgent → Retry → RiskControl → Base
-	mid, ok := transport.(*extensionMiddleware)
-	if !ok {
-		t.Fatalf("outer transport type = %T, want *extensionMiddleware", transport)
+	client := internaltransport.ClientForRequestClass(
+		&http.Client{Transport: buildSDKTransport(nil)},
+		exttransport.RequestClassPlatform,
+	)
+	resp, err := client.Get(server.URL)
+	if err != nil {
+		t.Fatal(err)
 	}
-	sec, ok := mid.Base.(*internalauth.SecurityPolicyTransport)
-	if !ok {
-		t.Fatalf("transport type = %T, want *auth.SecurityPolicyTransport", mid.Base)
-	}
-	bh, ok := sec.Base.(*BuildHeaderTransport)
-	if !ok {
-		t.Fatalf("layer after SecurityPolicy = %T, want *BuildHeaderTransport", sec.Base)
-	}
-	ua, ok := bh.Base.(*UserAgentTransport)
-	if !ok {
-		t.Fatalf("layer after BuildHeader = %T, want *UserAgentTransport", bh.Base)
-	}
-	retry, ok := ua.Base.(*RetryTransport)
-	if !ok {
-		t.Fatalf("innermost transport type = %T, want *RetryTransport", ua.Base)
-	}
-	if _, ok := retry.Base.(*riskcontrol.Transport); !ok {
-		t.Fatalf("layer after Retry = %T, want *riskcontrol.Transport", retry.Base)
+	resp.Body.Close()
+	if !interceptor.preCalled || !interceptor.postCalled {
+		t.Fatal("SDK platform request did not execute extension pre/post hooks")
 	}
 }
 
-func TestWrapSDKTransport_WithoutExtension(t *testing.T) {
+func TestBuildSDKTransport_WithoutExtension(t *testing.T) {
 	previous := exttransport.GetProvider()
 	exttransport.Register(nil)
 	t.Cleanup(func() { exttransport.Register(previous) })
 
-	transport := wrapSDKTransport(riskcontrol.NewTransport(http.DefaultTransport, nil))
+	if _, ok := buildSDKTransport(nil).(*internaltransport.HTTPPolicyRouter); !ok {
+		t.Fatalf(
+			"buildSDKTransport() type = %T, want *transport.HTTPPolicyRouter",
+			buildSDKTransport(nil),
+		)
+	}
+}
 
-	// Chain: SecurityPolicy → BuildHeader → UserAgent → Retry → RiskControl → Base
-	sec, ok := transport.(*internalauth.SecurityPolicyTransport)
+func TestBuildSDKTransportSupportsPolicyLeafCloning(t *testing.T) {
+	previous := exttransport.GetProvider()
+	exttransport.Register(nil)
+	t.Cleanup(func() { exttransport.Register(previous) })
+
+	base := &http.Transport{}
+	client := internaltransport.ClientForRequestClass(
+		&http.Client{Transport: buildSDKTransportWithBase(base, nil)},
+		exttransport.RequestClassExternal,
+	)
+	source, ok := client.Transport.(interface {
+		CloneHTTPTransport() (http.RoundTripper, *http.Transport, bool)
+	})
 	if !ok {
-		t.Fatalf("outer transport type = %T, want *auth.SecurityPolicyTransport", transport)
+		t.Fatalf("SDK request-class transport type = %T, want clone capability", client.Transport)
 	}
-	bh, ok := sec.Base.(*BuildHeaderTransport)
-	if !ok {
-		t.Fatalf("layer after SecurityPolicy = %T, want *BuildHeaderTransport", sec.Base)
+	rebuilt, concrete, ok := source.CloneHTTPTransport()
+	if !ok || rebuilt == nil || concrete == nil {
+		t.Fatal("SDK policy graph could not clone its HTTP transport leaf")
 	}
-	ua, ok := bh.Base.(*UserAgentTransport)
-	if !ok {
-		t.Fatalf("layer after BuildHeader = %T, want *UserAgentTransport", bh.Base)
-	}
-	retry, ok := ua.Base.(*RetryTransport)
-	if !ok {
-		t.Fatalf("inner transport type = %T, want *RetryTransport", ua.Base)
-	}
-	if _, ok := retry.Base.(*riskcontrol.Transport); !ok {
-		t.Fatalf("layer after Retry = %T, want *riskcontrol.Transport", retry.Base)
+	if concrete == base {
+		t.Fatal("SDK policy graph reused the original HTTP transport")
 	}
 }
 
@@ -238,7 +251,7 @@ func TestExtensionInterceptor_ExecutionOrder(t *testing.T) {
 	var base http.RoundTripper = http.DefaultTransport
 	base = &RetryTransport{Base: base}
 	base = &SecurityHeaderTransport{Base: base}
-	transport := wrapWithExtension(base)
+	transport := internaltransport.WrapWithExtension(base)
 	client := &http.Client{Transport: transport}
 
 	req, _ := http.NewRequest("GET", srv.URL, nil)
@@ -266,14 +279,16 @@ func TestExtensionInterceptor_ExecutionOrder(t *testing.T) {
 	}
 }
 
-// buildTamperingInterceptor tries to delete and spoof X-Cli-Build via
-// PreRoundTrip. The SDK chain's BuildHeaderTransport must restore the real
-// value before the request leaves the process.
+// buildTamperingInterceptor tries to delete and spoof security headers via
+// PreRoundTrip. The SDK built-in chain must restore the real values before the
+// request leaves the process.
 type buildTamperingInterceptor struct{}
 
 func (buildTamperingInterceptor) PreRoundTrip(req *http.Request) func(*http.Response, error) {
 	req.Header.Del(HeaderBuild)
 	req.Header.Set(HeaderBuild, "ext-tampered-build")
+	req.Header.Del(HeaderSource)
+	req.Header.Set(HeaderSource, "ext-tampered-source")
 	return nil
 }
 
@@ -285,7 +300,74 @@ func (riskHeaderTamperingInterceptor) PreRoundTrip(req *http.Request) func(*http
 	return nil
 }
 
-func TestWrapSDKTransport_StripsExtensionRiskHeaders(t *testing.T) {
+type bootstrapPolicyTamperingInterceptor struct{}
+
+func (bootstrapPolicyTamperingInterceptor) PreRoundTrip(req *http.Request) func(*http.Response, error) {
+	req.Header.Set(HeaderSource, "extension-value")
+	req.Header.Set(riskcontrol.HeaderOSType, "extension-value")
+	return nil
+}
+
+func TestNewDefaultInstallsSDKBootstrapSecurityPolicy(t *testing.T) {
+	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
+	oldTransport := http.DefaultClient.Transport
+	oldCheckRedirect := http.DefaultClient.CheckRedirect
+	t.Cleanup(func() {
+		http.DefaultClient.Transport = oldTransport
+		http.DefaultClient.CheckRedirect = oldCheckRedirect
+	})
+
+	previous := exttransport.GetProvider()
+	exttransport.Register(&platformOnlyStubProvider{
+		stubTransportProvider: &stubTransportProvider{
+			interceptor: bootstrapPolicyTamperingInterceptor{},
+		},
+	})
+	t.Cleanup(func() { exttransport.Register(previous) })
+
+	var received http.Header
+	network := roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		received = req.Header.Clone()
+		return &http.Response{
+			StatusCode: http.StatusNoContent,
+			Body:       http.NoBody,
+			Request:    req,
+		}, nil
+	})
+	http.DefaultClient.Transport = network
+	http.DefaultClient.CheckRedirect = nil
+	_ = NewDefault(nil, InvocationContext{})
+
+	req, err := http.NewRequest(
+		http.MethodPost,
+		"https://open.feishu.cn/callback/ws/endpoint",
+		strings.NewReader(`{"app_secret":"secret"}`),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+
+	if got := received.Get(HeaderSource); got != SourceValue {
+		t.Fatalf("%s = %q, want trusted value %q", HeaderSource, got, SourceValue)
+	}
+	if got := received.Get(riskcontrol.HeaderOSType); got != "" {
+		t.Fatalf("%s = %q, want extension value stripped", riskcontrol.HeaderOSType, got)
+	}
+	if got := received.Get(HeaderBuild); got != DetectBuildKind() {
+		t.Fatalf("%s = %q, want %q", HeaderBuild, got, DetectBuildKind())
+	}
+	if got := received.Get(HeaderUserAgent); got != UserAgentValue() {
+		t.Fatalf("%s = %q, want %q", HeaderUserAgent, got, UserAgentValue())
+	}
+}
+
+func TestBuildSDKTransport_StripsExtensionRiskHeaders(t *testing.T) {
 	previous := exttransport.GetProvider()
 	exttransport.Register(&stubTransportProvider{interceptor: riskHeaderTamperingInterceptor{}})
 	t.Cleanup(func() { exttransport.Register(previous) })
@@ -301,7 +383,11 @@ func TestWrapSDKTransport_StripsExtensionRiskHeaders(t *testing.T) {
 	}
 	req.Header.Set("Authorization", "Bearer token")
 
-	resp, err := wrapSDKTransport(riskcontrol.NewTransport(network, nil)).RoundTrip(req)
+	client := internaltransport.ClientForRequestClass(
+		&http.Client{Transport: buildSDKTransportWithBase(network, nil)},
+		exttransport.RequestClassPlatform,
+	)
+	resp, err := client.Do(req)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -312,14 +398,13 @@ func TestWrapSDKTransport_StripsExtensionRiskHeaders(t *testing.T) {
 }
 
 // TestBuildHeaderTransport_SDKChain_OverridesTamperedHeader verifies that the
-// X-Cli-Build header is force-written by BuildHeaderTransport in the SDK
-// transport chain, even when an extension tries to delete or spoof it. This
-// closes the gap where the SDK chain had no equivalent of
-// SecurityHeaderTransport (see design doc §3.3.3).
+// SDK chain restores both the build classification and the full security
+// header set after an extension runs.
 func TestBuildHeaderTransport_SDKChain_OverridesTamperedHeader(t *testing.T) {
-	var receivedBuild string
+	var receivedBuild, receivedSource string
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		receivedBuild = r.Header.Get(HeaderBuild)
+		receivedSource = r.Header.Get(HeaderSource)
 		w.WriteHeader(http.StatusOK)
 	}))
 	defer srv.Close()
@@ -327,12 +412,13 @@ func TestBuildHeaderTransport_SDKChain_OverridesTamperedHeader(t *testing.T) {
 	exttransport.Register(&stubTransportProvider{interceptor: buildTamperingInterceptor{}})
 	t.Cleanup(func() { exttransport.Register(nil) })
 
-	// Replicate the SDK chain layering used by wrapSDKTransport.
+	// Replicate the SDK built-in chain inside buildSDKTransport.
 	var base http.RoundTripper = http.DefaultTransport
 	base = &RetryTransport{Base: base}
 	base = &UserAgentTransport{Base: base}
 	base = &BuildHeaderTransport{Base: base}
-	transport := wrapWithExtension(base)
+	base = &SecurityHeaderTransport{Base: base}
+	transport := internaltransport.WrapWithExtension(base)
 	client := &http.Client{Transport: transport}
 
 	req, _ := http.NewRequest("GET", srv.URL, nil)
@@ -349,6 +435,9 @@ func TestBuildHeaderTransport_SDKChain_OverridesTamperedHeader(t *testing.T) {
 	if receivedBuild != want {
 		t.Fatalf("%s = %q, want %q", HeaderBuild, receivedBuild, want)
 	}
+	if receivedSource != SourceValue {
+		t.Fatalf("%s = %q, want %q", HeaderSource, receivedSource, SourceValue)
+	}
 }
 
 // TestBuildHeaderTransport_OverridesEvenWithoutTamper verifies that even if
@@ -438,7 +527,7 @@ func TestExtensionInterceptor_ContextTamperPrevented(t *testing.T) {
 		return nil
 	})
 
-	mid := &extensionMiddleware{Base: capturer, Ext: tamperIC}
+	mid := &internaltransport.ExtensionMiddleware{Base: capturer, Ext: tamperIC}
 
 	origCtx := context.WithValue(context.Background(), testKey, "original")
 	req, _ := http.NewRequestWithContext(origCtx, "GET", srv.URL, nil)
@@ -500,7 +589,7 @@ func TestExtensionMiddleware_PreRoundTripEAbort(t *testing.T) {
 			return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}, nil
 		})
 
-		mid := &extensionMiddleware{Base: base, Ext: ic, ExtName: "stub"}
+		mid := &internaltransport.ExtensionMiddleware{Base: base, Ext: ic, ExtName: "stub"}
 		req, _ := http.NewRequest("GET", "http://example.invalid/", nil)
 		resp, err := mid.RoundTrip(req)
 
@@ -541,7 +630,7 @@ func TestExtensionMiddleware_PreRoundTripEAbort(t *testing.T) {
 			return nil, nil
 		})
 
-		mid := &extensionMiddleware{Base: base, Ext: ic, ExtName: "stub"}
+		mid := &internaltransport.ExtensionMiddleware{Base: base, Ext: ic, ExtName: "stub"}
 		req, _ := http.NewRequest("GET", "http://example.invalid/", nil)
 		_, err := mid.RoundTrip(req)
 
@@ -560,7 +649,7 @@ func TestExtensionMiddleware_PreRoundTripEHappyPath(t *testing.T) {
 		return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}, nil
 	})
 
-	mid := &extensionMiddleware{Base: base, Ext: ic, ExtName: "stub"}
+	mid := &internaltransport.ExtensionMiddleware{Base: base, Ext: ic, ExtName: "stub"}
 	req, _ := http.NewRequest("GET", "http://example.invalid/", nil)
 	resp, err := mid.RoundTrip(req)
 	if err != nil {

internal/core/config.go

@@ -255,11 +255,7 @@ func ResolveConfigFromMulti(raw *MultiAppConfig, kc keychain.KeychainAccess, pro
 	}
 
 	if err := ValidateSecretKeyMatch(app.AppId, app.AppSecret); err != nil {
-		// invalid_config, not not_configured: the config exists but is
-		// internally inconsistent. not_configured would let callers degrade
-		// this into a generic "secret invalid" answer and destroy the precise
-		// repair hint (which names the expected keychain key — never a value).
-		return nil, errs.NewConfigError(errs.SubtypeInvalidConfig, "appId and appSecret keychain key are out of sync").
+		return nil, errs.NewConfigError(errs.SubtypeNotConfigured, "appId and appSecret keychain key are out of sync").
 			WithHint("%s", err.Error()).
 			WithCause(err)
 	}

internal/core/notconfigured.go

@@ -36,13 +36,16 @@ func LoadOrNotConfigured() (*MultiAppConfig, error) {
 		if errors.Is(err, os.ErrNotExist) {
 			return nil, NotConfiguredError()
 		}
-		// Surface the real cause so the user can fix the broken file. Every
-		// non-ENOENT load failure — malformed JSON, permission denied, I/O
-		// error — means a config EXISTS but cannot be used: invalid_config.
-		// Only a genuinely absent config is not_configured; anything else
-		// classified as not_configured would let callers degrade it into
-		// profile_not_found / no_active_profile and hide the real cause.
-		return nil, errs.NewConfigError(errs.SubtypeInvalidConfig, "failed to load config: %v", err).WithCause(err)
+		// Surface the real cause (parse error, permission denied, etc.)
+		// so the user can fix the broken file. A malformed file is
+		// invalid_config; anything else (permission denied, etc.) is
+		// not_configured. Both stay on the typed structured-envelope path
+		// at the root command's error sink.
+		subtype := errs.SubtypeNotConfigured
+		if isMalformedConfigError(err) {
+			subtype = errs.SubtypeInvalidConfig
+		}
+		return nil, errs.NewConfigError(subtype, "failed to load config: %v", err).WithCause(err)
 	}
 	if multi == nil || len(multi.Apps) == 0 {
 		return nil, NotConfiguredError()

internal/core/types.go

@@ -3,7 +3,10 @@
 
 package core
 
-import "strings"
+import (
+	"net/url"
+	"strings"
+)
 
 // LarkBrand represents the Lark platform brand.
 // "feishu" targets China-mainland, "lark" targets international.
@@ -63,3 +66,39 @@ func ResolveEndpoints(brand LarkBrand) Endpoints {
 func ResolveOpenBaseURL(brand LarkBrand) string {
 	return ResolveEndpoints(brand).Open
 }
+
+var platformEndpointHosts = func() map[string]struct{} {
+	hosts := make(map[string]struct{})
+	for _, brand := range []LarkBrand{BrandFeishu, BrandLark} {
+		endpoints := ResolveEndpoints(brand)
+		for _, rawURL := range []string{endpoints.Open, endpoints.Accounts, endpoints.MCP, endpoints.AppLink} {
+			parsed, err := url.Parse(rawURL)
+			if err == nil && parsed.Hostname() != "" {
+				hosts[strings.ToLower(parsed.Hostname())] = struct{}{}
+			}
+		}
+	}
+	return hosts
+}()
+
+// IsPlatformEndpointHost reports whether hostname exactly matches one of the
+// endpoint hosts produced by ResolveEndpoints. It intentionally does not use a
+// suffix match: lookalike external domains must never enter the platform
+// transport extension.
+func IsPlatformEndpointHost(hostname string) bool {
+	_, ok := platformEndpointHosts[strings.ToLower(hostname)]
+	return ok
+}
+
+// IsPlatformEndpointURL reports whether candidate uses a secure origin for a
+// configured platform endpoint. Non-TLS and non-standard-port lookalikes are
+// excluded even when their hostname matches.
+func IsPlatformEndpointURL(candidate *url.URL) bool {
+	if candidate == nil || !strings.EqualFold(candidate.Scheme, "https") {
+		return false
+	}
+	if port := candidate.Port(); port != "" && port != "443" {
+		return false
+	}
+	return IsPlatformEndpointHost(candidate.Hostname())
+}

internal/core/types_test.go

@@ -3,7 +3,11 @@
 
 package core
 
-import "testing"
+import (
+	"net/url"
+	"reflect"
+	"testing"
+)
 
 func TestResolveEndpoints_Feishu(t *testing.T) {
 	ep := ResolveEndpoints(BrandFeishu)
@@ -91,3 +95,85 @@ func TestResolveEndpoints_NormalizesBrand(t *testing.T) {
 		t.Errorf("ResolveEndpoints(unexpected).Open = %q, want the feishu default", got)
 	}
 }
+
+func TestIsPlatformEndpointHost_ExactMatchOnly(t *testing.T) {
+	for _, host := range []string{
+		"open.feishu.cn",
+		"accounts.feishu.cn",
+		"mcp.feishu.cn",
+		"applink.feishu.cn",
+		"open.larksuite.com",
+		"accounts.larksuite.com",
+		"mcp.larksuite.com",
+		"applink.larksuite.com",
+	} {
+		if !IsPlatformEndpointHost(host) {
+			t.Errorf("IsPlatformEndpointHost(%q) = false, want true", host)
+		}
+	}
+
+	for _, host := range []string{
+		"example.com",
+		"open.feishu.cn.example.com",
+		"notopen.feishu.cn",
+		"",
+	} {
+		if IsPlatformEndpointHost(host) {
+			t.Errorf("IsPlatformEndpointHost(%q) = true, want false", host)
+		}
+	}
+}
+
+func TestIsPlatformEndpointHost_CoversEveryResolvedEndpoint(t *testing.T) {
+	for _, brand := range []LarkBrand{BrandFeishu, BrandLark} {
+		endpoints := reflect.ValueOf(ResolveEndpoints(brand))
+		for i := 0; i < endpoints.NumField(); i++ {
+			rawURL := endpoints.Field(i).String()
+			parsed, err := url.Parse(rawURL)
+			if err != nil {
+				t.Fatalf("ResolveEndpoints(%q) field %d URL %q: %v", brand, i, rawURL, err)
+			}
+			if !IsPlatformEndpointHost(parsed.Hostname()) {
+				t.Errorf("ResolveEndpoints(%q) field %d host %q is missing from the platform transport boundary", brand, i, parsed.Hostname())
+			}
+		}
+	}
+}
+
+func TestIsPlatformEndpointURL_RequiresSecureStandardOrigin(t *testing.T) {
+	if IsPlatformEndpointURL(nil) {
+		t.Error("IsPlatformEndpointURL(nil) = true, want false")
+	}
+	uppercaseScheme := &url.URL{Scheme: "HTTPS", Host: "open.feishu.cn", Path: "/path"}
+	if !IsPlatformEndpointURL(uppercaseScheme) {
+		t.Error("IsPlatformEndpointURL() rejected uppercase HTTPS scheme")
+	}
+
+	for _, rawURL := range []string{
+		"http://open.feishu.cn/path",
+		"https://open.feishu.cn:8443/path",
+		"https://open.feishu.cn.example.com/path",
+	} {
+		candidate, err := url.Parse(rawURL)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if IsPlatformEndpointURL(candidate) {
+			t.Errorf("IsPlatformEndpointURL(%q) = true, want false", rawURL)
+		}
+	}
+
+	for _, rawURL := range []string{
+		"https://open.feishu.cn/path",
+		"https://open.feishu.cn:443/path",
+		"https://OPEN.FEISHU.CN/path",
+	} {
+		candidate, err := url.Parse(rawURL)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if !IsPlatformEndpointURL(candidate) {
+			t.Errorf("IsPlatformEndpointURL(%q) = false, want true", rawURL)
+		}
+	}
+}

internal/credential/authsidecar_contract_test.go

@@ -1,154 +0,0 @@
-// Copyright (c) 2026 Lark Technologies Pte. Ltd.
-// SPDX-License-Identifier: MIT
-
-//go:build authsidecar
-
-package credential_test
-
-import (
-	"context"
-	"errors"
-	"strings"
-	"testing"
-
-	"github.com/larksuite/cli/errs"
-	extcred "github.com/larksuite/cli/extension/credential"
-	sidecarprovider "github.com/larksuite/cli/extension/credential/sidecar"
-	"github.com/larksuite/cli/internal/credential"
-	"github.com/larksuite/cli/internal/envvars"
-	"github.com/larksuite/cli/internal/output"
-	"github.com/larksuite/cli/sidecar"
-)
-
-func newRealSidecarCredentialProvider(t *testing.T) *credential.CredentialProvider {
-	t.Helper()
-	t.Setenv(envvars.CliAuthProxy, "http://127.0.0.1:16384")
-	t.Setenv(envvars.CliProxyKey, "test-key")
-	t.Setenv(envvars.CliAppID, "cli_sidecar")
-	t.Setenv(envvars.CliAppSecret, "")
-	t.Setenv(envvars.CliUserAccessToken, "")
-	t.Setenv(envvars.CliTenantAccessToken, "")
-	t.Setenv(envvars.CliDefaultAs, "")
-	t.Setenv(envvars.CliStrictMode, "")
-	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
-
-	return credential.NewCredentialProvider(
-		[]extcred.Provider{&sidecarprovider.Provider{}},
-		nil,
-		nil,
-		nil,
-	)
-}
-
-func TestAuthSidecarInvalidPolicyUsesValidationContract(t *testing.T) {
-	for _, tt := range []struct {
-		name string
-		key  string
-	}{
-		{name: "default as", key: envvars.CliDefaultAs},
-		{name: "strict mode", key: envvars.CliStrictMode},
-	} {
-		t.Run(tt.name, func(t *testing.T) {
-			cp := newRealSidecarCredentialProvider(t)
-			t.Setenv(tt.key, "banana")
-
-			_, err := cp.ResolveAccount(context.Background())
-			problem, ok := errs.ProblemOf(err)
-			if !ok {
-				t.Fatalf("error = %T %v, want typed validation error", err, err)
-			}
-			if problem.Category != errs.CategoryValidation || problem.Subtype != errs.SubtypeInvalidArgument {
-				t.Fatalf("problem = %s/%s, want %s/%s", problem.Category, problem.Subtype, errs.CategoryValidation, errs.SubtypeInvalidArgument)
-			}
-			var validationErr *errs.ValidationError
-			if !errors.As(err, &validationErr) {
-				t.Fatalf("error = %T %v, want ValidationError", err, err)
-			}
-			if validationErr.Param != tt.key {
-				t.Fatalf("param = %q, want %q", validationErr.Param, tt.key)
-			}
-			if got := output.ExitCodeOf(err); got != output.ExitValidation {
-				t.Fatalf("exit code = %d, want %d", got, output.ExitValidation)
-			}
-			if !strings.Contains(problem.Hint, tt.key) {
-				t.Fatalf("hint = %q, want variable name %s", problem.Hint, tt.key)
-			}
-			var blockErr *extcred.BlockError
-			if !errors.As(err, &blockErr) ||
-				blockErr.Code != extcred.BlockReasonInvalidPolicy ||
-				blockErr.Param != tt.key {
-				t.Fatalf("cause = %T %v, want classified BlockError for %s", err, err, tt.key)
-			}
-		})
-	}
-}
-
-func TestAuthSidecarGateProbeUsesValidationContract(t *testing.T) {
-	cp := newRealSidecarCredentialProvider(t)
-	t.Setenv(envvars.CliStrictMode, "banana")
-
-	name, err := cp.ActiveExtensionProviderName(context.Background())
-	if name != "" {
-		t.Fatalf("provider name = %q, want empty on invalid policy", name)
-	}
-	problem, ok := errs.ProblemOf(err)
-	if !ok {
-		t.Fatalf("error = %T %v, want typed validation error", err, err)
-	}
-	var validationErr *errs.ValidationError
-	if !errors.As(err, &validationErr) {
-		t.Fatalf("error = %T %v, want ValidationError", err, err)
-	}
-	if problem.Category != errs.CategoryValidation ||
-		problem.Subtype != errs.SubtypeInvalidArgument ||
-		validationErr.Param != envvars.CliStrictMode {
-		t.Fatalf("problem = %+v param = %q, want validation/invalid_argument param %s", problem, validationErr.Param, envvars.CliStrictMode)
-	}
-}
-
-func TestAuthSidecarTokenHonorsSelectedAppID(t *testing.T) {
-	t.Run("matching app returns sentinel", func(t *testing.T) {
-		cp := newRealSidecarCredentialProvider(t)
-
-		result, err := cp.ResolveToken(context.Background(), credential.TokenSpec{
-			Type:  credential.TokenTypeUAT,
-			AppID: "cli_sidecar",
-		})
-		if err != nil {
-			t.Fatalf("ResolveToken: %v", err)
-		}
-		if result == nil || result.Token != sidecar.SentinelUAT {
-			t.Fatalf("result = %+v, want sidecar UAT sentinel", result)
-		}
-	})
-
-	for _, tt := range []struct {
-		name  string
-		appID string
-	}{
-		{name: "empty app id", appID: ""},
-		{name: "conflicting app id", appID: "cli_other"},
-	} {
-		t.Run(tt.name, func(t *testing.T) {
-			cp := newRealSidecarCredentialProvider(t)
-
-			result, err := cp.ResolveToken(context.Background(), credential.TokenSpec{
-				Type:  credential.TokenTypeUAT,
-				AppID: tt.appID,
-			})
-			if result != nil {
-				t.Fatalf("result = %+v, want no sidecar sentinel", result)
-			}
-			problem, ok := errs.ProblemOf(err)
-			if !ok {
-				t.Fatalf("error = %T %v, want typed internal error", err, err)
-			}
-			if problem.Category != errs.CategoryInternal || problem.Subtype != errs.SubtypeUnknown {
-				t.Fatalf("problem = %s/%s, want %s/%s", problem.Category, problem.Subtype, errs.CategoryInternal, errs.SubtypeUnknown)
-			}
-			if strings.Contains(err.Error(), sidecar.SentinelUAT) {
-				t.Fatalf("error leaked sidecar sentinel: %v", err)
-			}
-		})
-	}
-}

internal/credential/credential_provider.go

@@ -9,17 +9,11 @@ import (
 	"fmt"
 	"io"
 	"net/http"
-	"os"
-	"slices"
-	"strings"
 	"sync"
 
-	"github.com/larksuite/cli/errs"
 	extcred "github.com/larksuite/cli/extension/credential"
-	envprovider "github.com/larksuite/cli/extension/credential/env"
 	"github.com/larksuite/cli/internal/auth"
 	"github.com/larksuite/cli/internal/core"
-	"github.com/larksuite/cli/internal/envvars"
 )
 
 // DefaultAccountResolver is implemented by the default account provider.
@@ -142,21 +136,10 @@ type CredentialProvider struct {
 	httpClient   func() (*http.Client, error)
 	warnOut      io.Writer
 
-	// profile is the active profile (from --profile or LARKSUITE_CLI_PROFILE);
-	// profileSrc records which of the two supplied it, for the reported
-	// selection and error attribution.
-	profile    string
-	profileSrc CredentialSourceKind
-
 	accountOnce    sync.Once
 	account        *Account
 	accountErr     error
 	selectedSource credentialSource
-	// selection is the explainable credential-selection result, populated by
-	// doResolveAccount under accountOnce. It never carries a secret.
-	selection IdentitySelection
-
-	enrichOnce sync.Once
 
 	hintOnce sync.Once
 	hint     *IdentityHint
@@ -178,521 +161,49 @@ func (p *CredentialProvider) SetWarnOut(warnOut io.Writer) *CredentialProvider {
 	return p
 }
 
-// WithProfileFromFlag records the --profile flag value as the active profile.
-// It governs credential arbitration and the reported selection source.
-func (p *CredentialProvider) WithProfileFromFlag(profile string) *CredentialProvider {
-	p.profile = profile
-	p.profileSrc = SourceFlagProfile
-	return p
-}
-
-// WithProfileFromEnv records the LARKSUITE_CLI_PROFILE env fallback as the
-// active profile. It governs credential arbitration and the reported
-// selection source.
-func (p *CredentialProvider) WithProfileFromEnv(profile string) *CredentialProvider {
-	p.profile = profile
-	p.profileSrc = SourceEnvProfile
-	return p
-}
-
 // ResolveAccount resolves app credentials. Result is cached after first call.
 // NOTE: Uses sync.Once — only the context from the first call is used for resolution.
 // Subsequent calls return the cached result regardless of their context.
 // This is acceptable for CLI (single invocation per process) but not for long-running servers.
 func (p *CredentialProvider) ResolveAccount(ctx context.Context) (*Account, error) {
-	acct, err := p.resolveAccountSelection(ctx)
-	if err != nil || acct == nil {
-		return acct, err
-	}
-	if _, ok := p.selectedSource.(extensionTokenSource); ok {
-		p.enrichOnce.Do(func() {
-			p.enrichOrClearIdentity(ctx, acct, p.selectedSource)
-		})
-	}
-	return acct, nil
-}
-
-// resolveAccountSelection performs and caches only credential selection. It
-// deliberately does not resolve tokens or user_info, so callers can validate
-// the selected app before any token work begins.
-func (p *CredentialProvider) resolveAccountSelection(ctx context.Context) (*Account, error) {
 	p.accountOnce.Do(func() {
 		p.account, p.accountErr = p.doResolveAccount(ctx)
 	})
 	return p.account, p.accountErr
 }
 
-// doResolveAccount arbitrates the credential/App selection in three phases:
-// gather all arbitration inputs in a single I/O pass, decide the route with a
-// pure function, then execute the remaining I/O for the chosen route.
-//
-// Resolution order (encoded in decideIdentity): a managed extension provider
-// (e.g. sidecar) wins outright; then an explicit profile (--profile /
-// LARKSUITE_CLI_PROFILE) arbitrates against the direct env credential
-// (matching app_id → profile supplies credential and tokens; mismatch → hard
-// conflict; incomplete env without a usable app_id → repair error); then a
-// complete direct env credential; then the config default (currentApp →
-// firstApp).
-//
-// It populates p.selection (never carries a secret) and p.selectedSource on
-// every success path.
 func (p *CredentialProvider) doResolveAccount(ctx context.Context) (*Account, error) {
-	in, err := p.gatherIdentityInputs(ctx)
-	if err != nil {
-		return nil, err
-	}
-	d, err := decideIdentity(in)
-	if err != nil {
-		return nil, err
-	}
-	acct, source, err := p.execute(ctx, d, in)
-	if err != nil {
-		return nil, err
-	}
-	p.selectedSource = source
-	// Assigned only after full success: error paths can never leave a
-	// partial selection behind.
-	p.selection = d.selection
-	return acct, nil
-}
-
-// providerAccount pairs an extension-provider account with its token source.
-type providerAccount struct {
-	acct   *Account
-	source extensionTokenSource
-}
-
-// identityInputs is one invocation's complete arbitration input, gathered in
-// a single pass by gatherIdentityInputs. It is read-only after gathering;
-// decideIdentity consumes it without further I/O.
-type identityInputs struct {
-	profile    string
-	profileSrc CredentialSourceKind
-
-	managed *providerAccount // managed extension account; wins arbitration outright
-	direct  *providerAccount // complete direct env credential
-	// directBlock is a provider's explicit incomplete-direct-credential
-	// classification (BlockError.Code == credential_incomplete). It
-	// participates in profile arbitration instead of failing outright.
-	directBlock *extcred.BlockError
-
-	// directKeys / conflictKeys describe the BUILTIN process-env direct
-	// credential surface (LARKSUITE_CLI_* variable NAMES, never values).
-	// They annotate DirectCredentialEnv and conflict hints; a third-party
-	// AccountDirect provider reports its own inputs via BlockError metadata
-	// (PresentKeys/AppID), not through these.
-	directKeys   []string
-	conflictKeys []string
-
-	config    *core.MultiAppConfig
-	configErr error
-}
-
-// gatherIdentityInputs performs the arbitration's read phase: it consults the
-// extension providers and snapshots the config. Providers classify their own
-// failures at the source (BlockError.Code); this layer must not infer them by
-// re-reading environment variables or parsing Reason.
-func (p *CredentialProvider) gatherIdentityInputs(ctx context.Context) (identityInputs, error) {
-	in := identityInputs{
-		profile:      p.profile,
-		profileSrc:   p.profileSrc,
-		directKeys:   presentDirectCredentialKeys(),
-		conflictKeys: presentDirectCredentialInputKeys(),
-	}
 	for _, prov := range p.providers {
 		acct, err := prov.ResolveAccount(ctx)
 		if err != nil {
-			var blockErr *extcred.BlockError
-			if errors.As(err, &blockErr) {
-				switch blockErr.Code {
-				case extcred.BlockReasonCredentialIncomplete:
-					// app_credential_incomplete, profile matching, and
-					// DirectCredentialEnv diagnostics are defined in terms of
-					// the builtin LARKSUITE_CLI_* env surface. Until the SPI
-					// carries provider-owned input descriptors, accepting this
-					// classification from another provider would produce
-					// contradictory arbitration and repair hints.
-					if _, builtin := prov.(*envprovider.Provider); !builtin {
-						return in, newCredentialIncompleteProviderContractError(prov)
-					}
-					in.directBlock = blockErr
-				case extcred.BlockReasonInvalidPolicy:
-					// A user-supplied policy value failed validation; that is
-					// a validation error, never an internal one.
-					return in, newInvalidPolicyError(blockErr)
-				default:
-					// Blocks without a recognized Code preserve their
-					// original attribution.
-					return in, err
+			return nil, err
+		}
+		if acct != nil {
+			internal := convertAccount(acct)
+			source := extensionTokenSource{provider: prov}
+			if err := p.enrichUserInfo(ctx, internal, source); err != nil {
+				if p.warnOut != nil {
+					_, _ = fmt.Fprintf(p.warnOut, "warning: unable to verify user identity from credential source %q: %v\n", source.Name(), err)
 				}
-				break
+				// enrichUserInfo failure is non-fatal: SupportedIdentities
+				// (used for strict mode) is already set by the provider.
+				// Clear unverified user identity for safety.
+				internal.UserOpenId = ""
+				internal.UserName = ""
 			}
-			// Any other provider error preserves its original attribution.
-			return in, err
-		}
-		if acct == nil {
-			continue
-		}
-		pa := &providerAccount{acct: convertAccount(acct), source: extensionTokenSource{provider: prov}}
-		switch acct.Kind {
-		case extcred.AccountDirect:
-			// The arbitration's direct-credential surface — DirectCredentialEnv,
-			// the env:LARKSUITE_CLI_APP_ID selection source, conflict-hint
-			// keys — is defined in terms of the builtin process-env variables.
-			// Until the SPI carries provider-reported input descriptors, only
-			// the builtin env provider may declare AccountDirect; accepting it
-			// from anyone else would produce self-contradictory diagnostics
-			// (e.g. credentialSource "env:LARKSUITE_CLI_APP_ID" with
-			// directCredentialEnv.present=false). The check is by concrete
-			// type: the registry reserves neither names nor uniqueness, so a
-			// Name() comparison would be forgeable.
-			if _, builtin := prov.(*envprovider.Provider); !builtin {
-				return in, errs.NewInternalError(errs.SubtypeUnknown,
-					"credential provider %q declared AccountDirect, which is reserved for the builtin env provider", prov.Name())
-			}
-			in.direct = pa
-		case extcred.AccountManaged:
-			in.managed = pa
-		default:
-			return in, errs.NewInternalError(errs.SubtypeUnknown,
-				"credential provider %q returned unknown AccountKind %d", prov.Name(), acct.Kind)
-		}
-		break // the first engaged provider ends the scan (registry priority order)
-	}
-	// The config snapshot backs profile lookup, the config-default route, and
-	// config-default failure attribution. A winning managed or direct-env
-	// identity without a profile never needs it — and managed identities must
-	// keep working when the config is absent or malformed.
-	if in.managed == nil && (in.profile != "" || in.direct == nil) {
-		in.config, in.configErr = core.LoadOrNotConfigured()
-	}
-	return in, nil
-}
-
-// credentialRoute names which source serves the selected account and tokens.
-type credentialRoute int
-
-const (
-	routeManaged credentialRoute = iota
-	routeProfile
-	routeDirectEnv
-	routeConfigDefault
-)
-
-// decision is decideIdentity's complete verdict. Nothing in it touched I/O.
-type decision struct {
-	route     credentialRoute
-	selection IdentitySelection
-	// profileAppID is set on routeProfile; app_id is plaintext and safe to
-	// echo in the secret-invalid error.
-	profileAppID string
-}
-
-// decideIdentity holds every selection rule in one place: precedence
-// (managed > profile > direct env > config default), profile/direct-env
-// conflict detection, and error attribution. It is pure — same inputs, same
-// verdict — so the full selection matrix is table-testable without env vars
-// or config fixtures.
-func decideIdentity(in identityInputs) (decision, error) {
-	// DirectCredentialEnv reports the direct env vars truthfully on every
-	// route: Present always means "direct credential env vars are set".
-	directEnv := DirectCredentialEnv{Present: len(in.directKeys) > 0, Keys: in.directKeys}
-	if in.direct != nil {
-		directEnv.AppID = in.direct.acct.AppID
-	}
-	switch {
-	case in.managed != nil:
-		return decision{route: routeManaged, selection: IdentitySelection{
-			Source:              SourceExtension(in.managed.source.Name()),
-			DirectCredentialEnv: directEnv,
-		}}, nil
-	case in.profile != "":
-		return decideProfile(in, directEnv)
-	case in.directBlock != nil:
-		return decision{}, newAppCredentialIncompleteError(in.directBlock, false)
-	case in.direct != nil:
-		return decision{route: routeDirectEnv, selection: IdentitySelection{
-			Source:              SourceEnvAppID,
-			DirectCredentialEnv: directEnv,
-		}}, nil
-	default:
-		return decision{route: routeConfigDefault, selection: IdentitySelection{
-			Source:              selectionSourceForDefault(in.config),
-			DirectCredentialEnv: directEnv,
-		}}, nil
-	}
-}
-
-// decideProfile arbitrates an explicit profile against the direct env
-// credential state.
-func decideProfile(in identityInputs, directEnv DirectCredentialEnv) (decision, error) {
-	app, err := findProfile(in)
-	if err != nil {
-		return decision{}, err
-	}
-	if in.directBlock != nil {
-		// APP_ID-only is sufficient to compare sources: a matching selected
-		// profile supplies the credential and tokens; a mismatch is the same
-		// hard conflict as a complete direct env. Anything less than a usable
-		// app_id keeps the provider's repair error, extended with the
-		// unset-to-use-the-profile path.
-		if in.directBlock.AppID == "" || !slices.Contains(in.directBlock.PresentKeys, envvars.CliAppID) {
-			return decision{}, newAppCredentialIncompleteError(in.directBlock, true)
-		}
-		if app.AppId != in.directBlock.AppID {
-			return decision{}, newProfileAppCredentialConflict(
-				in.profile, app.AppId, in.directBlock.AppID, in.directBlock.PresentKeys)
-		}
-		directEnv.AppID = in.directBlock.AppID
-		directEnv.Matched = true
-	}
-	if in.direct != nil {
-		// E == complete: the direct env app_id must match the profile.
-		if app.AppId != in.direct.acct.AppID {
-			return decision{}, newProfileAppCredentialConflict(
-				in.profile, app.AppId, in.direct.acct.AppID, in.conflictKeys)
-		}
-		directEnv.Matched = true
-	}
-	return decision{
-		route:        routeProfile,
-		selection:    IdentitySelection{Source: in.profileSrc, DirectCredentialEnv: directEnv},
-		profileAppID: app.AppId,
-	}, nil
-}
-
-// findProfile resolves the requested profile against the config snapshot.
-// A malformed config must surface its real typed cause (invalid_config):
-// reporting it as profile_not_found would send the user to `profile list`
-// and hide the broken file. Only a genuinely absent config degrades to
-// profile_not_found, because the profile then cannot exist anywhere. Both
-// deliberately outrank an incomplete direct env: fixing the profile side is
-// what makes the selected profile usable.
-func findProfile(in identityInputs) (*core.AppConfig, error) {
-	if in.configErr != nil {
-		if prob, ok := errs.ProblemOf(in.configErr); !ok || prob.Subtype != errs.SubtypeNotConfigured {
-			return nil, in.configErr
+			p.selectedSource = source
+			return internal, nil
 		}
 	}
-	if in.config != nil {
-		if app := in.config.FindApp(in.profile); app != nil {
-			return app, nil
-		}
-	}
-	return nil, errs.NewConfigError(errs.SubtypeProfileNotFound,
-		"profile %q not found", in.profile).
-		WithProfile(in.profile).
-		WithCredentialSource(string(in.profileSrc)).
-		WithHint("run `lark-cli profile list` to see available profiles.")
-}
-
-// execute performs the remaining I/O for the decided route and returns the
-// account together with its token source.
-func (p *CredentialProvider) execute(ctx context.Context, d decision, in identityInputs) (*Account, credentialSource, error) {
-	switch d.route {
-	case routeManaged:
-		return in.managed.acct, in.managed.source, nil
-	case routeDirectEnv:
-		return in.direct.acct, in.direct.source, nil
-	case routeProfile:
-		// Resolve the profile's own (keychain-backed) credential locally.
+	if p.defaultAcct != nil {
 		acct, err := p.defaultAcct.ResolveAccount(ctx)
 		if err != nil {
-			// A typed failure other than not_configured carries its own
-			// precise, secret-free diagnosis (typed errors never embed secret
-			// material per the error contract) — pass it through instead of
-			// flattening it into the generic secret error. Untyped failures
-			// and a config that vanished mid-resolution stay masked: their
-			// content is not guaranteed secret-free.
-			if prob, ok := errs.ProblemOf(err); ok && prob.Subtype != errs.SubtypeNotConfigured {
-				return nil, nil, err
-			}
-			return nil, nil, newProfileSecretInvalidError(in.profile, d.profileAppID)
+			return nil, err
 		}
-		// The resolver re-reads the config; a concurrent profile edit between
-		// gather and here could hand back a different app. Refuse the mismatch
-		// instead of silently using credentials the arbitration never checked.
-		if acct.AppID != d.profileAppID {
-			return nil, nil, errs.NewInternalError(errs.SubtypeUnknown,
-				"config changed during resolution: profile %q resolved to a different app", in.profile).
-				WithHint("retry the command.")
-		}
-		return acct, defaultTokenSource{resolver: p.defaultToken}, nil
-	default: // routeConfigDefault
-		if p.defaultAcct == nil {
-			return nil, nil, core.NotConfiguredError()
-		}
-		acct, err := p.defaultAcct.ResolveAccount(ctx)
-		if err != nil {
-			return nil, nil, translateConfigDefaultFailure(err, in.config)
-		}
-		return acct, defaultTokenSource{resolver: p.defaultToken}, nil
+		p.selectedSource = defaultTokenSource{resolver: p.defaultToken}
+		return acct, nil
 	}
-}
-
-// translateConfigDefaultFailure attributes a config-default failure from the
-// snapshot: a default profile that EXISTS (has an app_id) but whose secret
-// cannot be resolved locally is profile_secret_invalid — "identity is
-// configured, its secret is broken" is more actionable than "no active
-// profile". Only when there is genuinely no usable default profile do we
-// report no_active_profile. Other typed failures pass through unchanged.
-func translateConfigDefaultFailure(err error, multi *core.MultiAppConfig) error {
-	if prob, ok := errs.ProblemOf(err); !ok || prob.Subtype != errs.SubtypeNotConfigured {
-		return err
-	}
-	if multi != nil {
-		if app := multi.CurrentAppConfig(""); app != nil && app.AppId != "" {
-			return newProfileSecretInvalidError(app.ProfileName(), app.AppId)
-		}
-	}
-	return errs.NewConfigError(errs.SubtypeNoActiveProfile, "no active profile").
-		WithCredentialSource(noActiveProfileCredentialSource).
-		WithHint("run `lark-cli config init` / `lark-cli profile add`, or set %s.", envvars.CliProfile)
-}
-
-func newProfileAppCredentialConflict(profile, profileAppID, envAppID string, presentKeys []string) error {
-	err := errs.NewValidationError(errs.SubtypeProfileAppCredentialConflict,
-		"profile %q app_id does not match %s", profile, envvars.CliAppID).
-		WithProfileAppConflict(profileAppID, envAppID)
-	if len(presentKeys) > 0 {
-		return err.WithHint("unset %s, or select a profile whose app_id matches the environment.",
-			humanList(presentKeys, "and"))
-	}
-	return err.WithHint("unset the direct credential environment variables, or select a profile whose app_id matches the environment.")
-}
-
-func newAppCredentialIncompleteError(blockErr *extcred.BlockError, selectedProfileAvailable bool) *errs.ConfigError {
-	err := errs.NewConfigError(errs.SubtypeAppCredentialIncomplete, "%s", blockErr.Reason).
-		WithCause(blockErr)
-	if len(blockErr.MissingKeys) > 0 {
-		err.WithMissingKeys(blockErr.MissingKeys...)
-	}
-	if len(blockErr.RequiredAnyOf) > 0 {
-		err.WithRequiredAnyOf(blockErr.RequiredAnyOf...)
-	}
-
-	hint := credentialRepairHint(blockErr)
-	if selectedProfileAvailable && len(blockErr.PresentKeys) > 0 {
-		hint += fmt.Sprintf(", or unset %s to use the selected profile", humanList(blockErr.PresentKeys, "and"))
-	}
-	return err.WithHint("%s.", hint)
-}
-
-func credentialRepairHint(blockErr *extcred.BlockError) string {
-	if len(blockErr.RequiredAnyOf) > 0 {
-		return "set " + humanList(blockErr.RequiredAnyOf, "or")
-	}
-	return "set " + humanList(blockErr.MissingKeys, "and")
-}
-
-func humanList(items []string, conjunction string) string {
-	switch len(items) {
-	case 0:
-		return "the missing direct credential variables"
-	case 1:
-		return items[0]
-	case 2:
-		return items[0] + " " + conjunction + " " + items[1]
-	default:
-		return strings.Join(items[:len(items)-1], ", ") + ", " + conjunction + " " + items[len(items)-1]
-	}
-}
-
-// newInvalidPolicyError translates a provider's invalid-policy block into the
-// typed validation contract: the failed variable name travels in param, the
-// repair path in the hint, and the original block stays on the cause chain.
-// Reason carries only the variable name and its non-secret value.
-func newInvalidPolicyError(blockErr *extcred.BlockError) error {
-	return errs.NewValidationError(errs.SubtypeInvalidArgument, "%s", blockErr.Reason).
-		WithParam(blockErr.Param).
-		WithCause(blockErr).
-		WithHint("set %s to a supported value or unset it.", blockErr.Param)
-}
-
-func newCredentialIncompleteProviderContractError(prov extcred.Provider) error {
-	return errs.NewInternalError(errs.SubtypeUnknown,
-		"credential provider %q returned credential_incomplete, which is reserved for the builtin env provider", prov.Name())
-}
-
-// newProfileSecretInvalidError is deliberately generic (SECURITY): the
-// underlying cause may carry secret material, so neither it nor its message
-// may reach the envelope. app_id is plaintext and safe to echo.
-func newProfileSecretInvalidError(profile, appID string) error {
-	return errs.NewConfigError(errs.SubtypeProfileSecretInvalid,
-		"profile %q credential could not be resolved locally", profile).
-		WithProfile(profile).
-		WithAppID(appID).
-		WithHint("verify the profile's app secret or re-add the profile with `lark-cli config`.")
-}
-
-// enrichOrClearIdentity verifies a provider-supplied user identity via
-// enrichUserInfo. Verification failure is non-fatal — SupportedIdentities
-// (used for strict mode) is already set by the provider — but an unverified
-// identity must not survive it: a stale OpenID would attribute calls to a
-// user the token can no longer act for.
-func (p *CredentialProvider) enrichOrClearIdentity(ctx context.Context, acct *Account, source credentialSource) {
-	err := p.enrichUserInfo(ctx, acct, source)
-	if err == nil {
-		return
-	}
-	if p.warnOut != nil {
-		_, _ = fmt.Fprintf(p.warnOut, "warning: unable to verify user identity from credential source %q: %v\n", source.Name(), err)
-	}
-	acct.UserOpenId = ""
-	acct.UserName = ""
-}
-
-// noActiveProfileCredentialSource is the credential_source reported on the
-// no_active_profile error. The error contract fixes this to the literal "config": there is
-// no resolved default profile at all, so the more specific config:currentApp /
-// config:firstApp source values (used on successful config-default selections)
-// would be misleading. It is an enum string, never a secret.
-const noActiveProfileCredentialSource = "config"
-
-// selectionSourceForDefault reports whether the config default resolved to the
-// explicit currentApp or fell back to the first app.
-func selectionSourceForDefault(multi *core.MultiAppConfig) CredentialSourceKind {
-	if multi != nil && multi.CurrentApp != "" {
-		return SourceConfigCurrentApp
-	}
-	return SourceConfigFirstApp
-}
-
-// presentDirectCredentialKeys returns the NAMES (never values) of the direct
-// app credential env vars that are set. Used to annotate DirectCredentialEnv.
-func presentDirectCredentialKeys() []string {
-	var keys []string
-	if os.Getenv(envvars.CliAppID) != "" {
-		keys = append(keys, envvars.CliAppID)
-	}
-	if os.Getenv(envvars.CliAppSecret) != "" {
-		keys = append(keys, envvars.CliAppSecret)
-	}
-	return keys
-}
-
-// presentDirectCredentialInputKeys returns all direct env input names that
-// must be cleared together to remove a profile/app_id conflict. Values are
-// never returned.
-func presentDirectCredentialInputKeys() []string {
-	keys := presentDirectCredentialKeys()
-	if os.Getenv(envvars.CliUserAccessToken) != "" {
-		keys = append(keys, envvars.CliUserAccessToken)
-	}
-	if os.Getenv(envvars.CliTenantAccessToken) != "" {
-		keys = append(keys, envvars.CliTenantAccessToken)
-	}
-	return keys
-}
-
-// Selection resolves the account (once) and returns the cached, secret-free
-// explanation of how the credential/App was selected. It mirrors
-// selectedCredentialSource: resolve-then-return.
-func (p *CredentialProvider) Selection(ctx context.Context) (IdentitySelection, error) {
-	if _, err := p.ResolveAccount(ctx); err != nil {
-		return IdentitySelection{}, err
-	}
-	return p.selection, nil
+	return nil, core.NotConfiguredError()
 }
 
 // enrichUserInfo resolves user identity when extension provides a UAT.
@@ -728,13 +239,17 @@ func (p *CredentialProvider) enrichUserInfo(ctx context.Context, acct *Account,
 }
 
 func (p *CredentialProvider) selectedCredentialSource(ctx context.Context) (credentialSource, error) {
-	if _, err := p.resolveAccountSelection(ctx); err != nil {
+	if p.selectedSource != nil {
+		return p.selectedSource, nil
+	}
+	if p.defaultAcct == nil {
+		return nil, nil
+	}
+	if _, err := p.ResolveAccount(ctx); err != nil {
 		return nil, err
 	}
 	if p.selectedSource == nil {
-		return nil, errs.NewInternalError(errs.SubtypeUnknown,
-			"credential provider resolved an account without selecting a token source").
-			WithHint("retry the command.")
+		return nil, fmt.Errorf("credential provider resolved an account without selecting a token source")
 	}
 	return p.selectedSource, nil
 }
@@ -787,88 +302,51 @@ func (p *CredentialProvider) doResolveIdentityHint(ctx context.Context) (*Identi
 
 // ResolveToken resolves an access token.
 func (p *CredentialProvider) ResolveToken(ctx context.Context, req TokenSpec) (*TokenResult, error) {
-	acct, err := p.resolveAccountSelection(ctx)
+	source, err := p.selectedCredentialSource(ctx)
 	if err != nil {
 		return nil, err
 	}
-	if acct == nil {
-		return nil, errs.NewInternalError(errs.SubtypeUnknown,
-			"credential provider resolved no account before %s token resolution", req.Type).
-			WithHint("retry the command.")
+	if source != nil {
+		return resolveTokenFromSource(ctx, source, req)
 	}
-	source := p.selectedSource
-	if source == nil {
-		return nil, errs.NewInternalError(errs.SubtypeUnknown,
-			"credential provider resolved app %q without selecting a token source", acct.AppID).
-			WithHint("retry the command.")
+
+	for _, prov := range p.providers {
+		source := extensionTokenSource{provider: prov}
+		result, found, err := source.TryResolveToken(ctx, req)
+		if err != nil {
+			return nil, err
+		}
+		if found {
+			return result, nil
+		}
 	}
-	if req.AppID == "" {
-		return nil, errs.NewInternalError(errs.SubtypeUnknown,
-			"TokenSpec.AppID is required for %s token resolution", req.Type).
-			WithHint("retry the command.")
+	source = defaultTokenSource{resolver: p.defaultToken}
+	result, found, err := source.TryResolveToken(ctx, req)
+	if err != nil {
+		return nil, err
 	}
-	if req.AppID != acct.AppID {
-		return nil, errs.NewInternalError(errs.SubtypeUnknown,
-			"token requested for app %q but the selected account belongs to app %q", req.AppID, acct.AppID).
-			WithHint("retry the command.")
+	if found {
+		return result, nil
 	}
-	return resolveTokenFromSource(ctx, source, req)
+	return nil, &TokenUnavailableError{Type: req.Type}
 }
 
 // ActiveExtensionProviderName reports whether an extension provider is managing
-// the credentials that actually win selection. With an explicit profile that
-// resolves successfully it reuses ResolveAccount's cached arbitration result;
-// otherwise it probes extension providers directly and returns the first
-// engaged provider.
+// credentials. It probes p.providers (extension providers only, not defaultAcct)
+// and returns the name of the first engaged provider.
 //
 // "Engaged" means: ResolveAccount returns a non-nil account, OR returns a
 // *extcred.BlockError (provider configured but misconfigured — still counts as
-// external). Any other probe error is propagated to the caller.
-//
-// A failed profile resolution (profile not found, broken secret, malformed
-// config, incomplete direct env, ...) deliberately does NOT propagate: this
-// probe guards the builtin setup/repair commands (auth, config), and an
-// unresolvable credential must never lock the user out of the commands that
-// fix it. It falls back to the engagement probe, which answers the only
-// question this function owns: is an extension provider holding credentials?
+// external). Any other error is propagated to the caller.
 //
 // Returns ("", nil) when no extension provider is active (built-in keychain path).
-// Safe to call multiple times: explicit-profile resolution uses sync.Once, while
-// the probe path only consults providers.
+// Safe to call multiple times — probes providers directly without the sync.Once cache.
 func (p *CredentialProvider) ActiveExtensionProviderName(ctx context.Context) (string, error) {
-	// With an explicit profile, report the source that actually won the same
-	// arbitration used by commands. A matching APP_ID-only env block is not an
-	// external takeover once the selected profile supplies credentials/tokens.
-	if p.profile != "" {
-		if _, err := p.ResolveAccount(ctx); err == nil {
-			if p.selectedSource == nil {
-				return "", nil
-			}
-			if _, builtin := p.selectedSource.(defaultTokenSource); builtin {
-				return "", nil
-			}
-			return p.selectedSource.Name(), nil
-		}
-		// Resolution failed — fall through to the engagement probe.
-	}
 	for _, prov := range p.providers {
 		acct, err := prov.ResolveAccount(ctx)
 		if err != nil {
 			var blockErr *extcred.BlockError
 			if errors.As(err, &blockErr) {
-				// Align with formal arbitration: a misconfigured policy
-				// variable is the same typed validation error everywhere —
-				// not an external takeover of the provider that reported it,
-				// and not license to keep scanning and blame a later
-				// provider instead.
-				if blockErr.Code == extcred.BlockReasonInvalidPolicy {
-					return "", newInvalidPolicyError(blockErr)
-				}
-				if blockErr.Code == extcred.BlockReasonCredentialIncomplete {
-					if _, builtin := prov.(*envprovider.Provider); !builtin {
-						return "", newCredentialIncompleteProviderContractError(prov)
-					}
-				}
 				name := blockErr.Provider
 				if name == "" {
 					name = prov.Name()

internal/credential/credential_provider_test.go

@@ -11,7 +11,6 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/larksuite/cli/errs"
 	extcred "github.com/larksuite/cli/extension/credential"
 	"github.com/larksuite/cli/internal/auth"
 	"github.com/larksuite/cli/internal/core"
@@ -24,7 +23,6 @@ type mockExtProvider struct {
 	err        error
 	accountErr error
 	tokenErr   error
-	tokenCalls int
 }
 
 func (m *mockExtProvider) Name() string { return m.name }
@@ -35,7 +33,6 @@ func (m *mockExtProvider) ResolveAccount(ctx context.Context) (*extcred.Account,
 	return m.account, m.err
 }
 func (m *mockExtProvider) ResolveToken(ctx context.Context, req extcred.TokenSpec) (*extcred.Token, error) {
-	m.tokenCalls++
 	if m.tokenErr != nil {
 		return nil, m.tokenErr
 	}
@@ -52,13 +49,11 @@ func (m *mockDefaultAcct) ResolveAccount(ctx context.Context) (*Account, error)
 }
 
 type mockDefaultToken struct {
-	result     *TokenResult
-	err        error
-	tokenCalls int
+	result *TokenResult
+	err    error
 }
 
 func (m *mockDefaultToken) ResolveToken(ctx context.Context, req TokenSpec) (*TokenResult, error) {
-	m.tokenCalls++
 	return m.result, m.err
 }
 
@@ -121,45 +116,35 @@ func TestCredentialProvider_AccountCached(t *testing.T) {
 }
 
 func TestCredentialProvider_TokenFromExtension(t *testing.T) {
-	for _, sourceName := range []string{"env", "authsidecar"} {
-		t.Run(sourceName, func(t *testing.T) {
-			cp := NewCredentialProvider(
-				[]extcred.Provider{&mockExtProvider{
-					name:    sourceName,
-					account: &extcred.Account{AppID: "ext_app", Brand: "feishu"},
-					token:   &extcred.Token{Value: "ext_tok", Source: sourceName},
-				}},
-				&mockDefaultAcct{account: &Account{AppID: "default_app"}},
-				&mockDefaultToken{result: &TokenResult{Token: "default_tok"}}, nil,
-			)
-			result, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: "ext_app"})
-			if err != nil {
-				t.Fatal(err)
-			}
-			if result.Token != "ext_tok" {
-				t.Errorf("expected ext_tok, got %s", result.Token)
-			}
-		})
+	cp := NewCredentialProvider(
+		[]extcred.Provider{&mockExtProvider{
+			name:    "env",
+			account: &extcred.Account{AppID: "ext_app", Brand: "feishu"},
+			token:   &extcred.Token{Value: "ext_tok", Source: "env"},
+		}},
+		&mockDefaultAcct{}, &mockDefaultToken{result: &TokenResult{Token: "default_tok"}}, nil,
+	)
+	result, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if result.Token != "ext_tok" {
+		t.Errorf("expected ext_tok, got %s", result.Token)
 	}
 }
 
 func TestCredentialProvider_TokenFallsToDefault(t *testing.T) {
-	defaultToken := &mockDefaultToken{result: &TokenResult{Token: "default_tok"}}
 	cp := NewCredentialProvider(
 		[]extcred.Provider{&mockExtProvider{name: "skip"}},
-		&mockDefaultAcct{account: &Account{AppID: "default_app"}},
-		defaultToken, nil,
+		&mockDefaultAcct{}, &mockDefaultToken{result: &TokenResult{Token: "default_tok"}}, nil,
 	)
-	result, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: "default_app"})
+	result, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT})
 	if err != nil {
 		t.Fatal(err)
 	}
 	if result.Token != "default_tok" {
 		t.Errorf("expected default_tok, got %s", result.Token)
 	}
-	if defaultToken.tokenCalls != 1 {
-		t.Fatalf("default ResolveToken() calls = %d, want 1", defaultToken.tokenCalls)
-	}
 }
 
 func TestCredentialProvider_TokenDoesNotMixSourcesAfterDefaultAccountSelection(t *testing.T) {
@@ -174,7 +159,7 @@ func TestCredentialProvider_TokenDoesNotMixSourcesAfterDefaultAccountSelection(t
 		t.Fatalf("ResolveAccount() error = %v", err)
 	}
 
-	result, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: "default_app"})
+	result, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT})
 	if err != nil {
 		t.Fatalf("ResolveToken() error = %v", err)
 	}
@@ -196,7 +181,7 @@ func TestCredentialProvider_SelectedSourceWithoutTokenReturnsUnavailableError(t
 		t.Fatalf("ResolveAccount() error = %v", err)
 	}
 
-	_, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: "ext_app"})
+	_, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT})
 	if err == nil {
 		t.Fatal("ResolveToken() error = nil, want unavailable error")
 	}
@@ -217,7 +202,7 @@ func TestCredentialProvider_ResolveTokenPropagatesNonBlockExtensionError(t *test
 		nil,
 	)
 
-	_, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: "ext_app"})
+	_, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT})
 	if err == nil || err.Error() != "provider exploded" {
 		t.Fatalf("ResolveToken() error = %v, want provider exploded", err)
 	}
@@ -327,12 +312,12 @@ func TestCredentialProvider_ResolveIdentityHint_CachesResult(t *testing.T) {
 func TestCredentialProvider_ResolveTokenTreatsEmptyDefaultTokenAsMalformed(t *testing.T) {
 	cp := NewCredentialProvider(
 		nil,
-		&mockDefaultAcct{account: &Account{AppID: "default_app"}},
+		nil,
 		&mockDefaultToken{result: &TokenResult{Token: ""}},
 		nil,
 	)
 
-	_, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: "default_app"})
+	_, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT})
 	if err == nil || !strings.Contains(err.Error(), "empty token") {
 		t.Fatalf("ResolveToken() error = %v, want malformed empty token error", err)
 	}
@@ -425,189 +410,17 @@ func TestCredentialProvider_ResolveAccountWarnsWhenExtensionIdentityVerification
 }
 
 func TestCredentialProvider_ResolveTokenDoesNotBypassFailedDefaultAccountResolution(t *testing.T) {
-	defaultToken := &mockDefaultToken{result: &TokenResult{Token: "default_tok"}}
 	cp := NewCredentialProvider(
 		nil,
 		&mockDefaultAcct{err: errors.New("config unavailable")},
-		defaultToken,
+		&mockDefaultToken{result: &TokenResult{Token: "default_tok"}},
 		nil,
 	)
 
-	_, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: "default_app"})
+	_, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT})
 	if err == nil || err.Error() != "config unavailable" {
 		t.Fatalf("ResolveToken() error = %v, want config unavailable", err)
 	}
-	if defaultToken.tokenCalls != 0 {
-		t.Fatalf("default ResolveToken() calls = %d, want 0", defaultToken.tokenCalls)
-	}
-}
-
-func TestCredentialProvider_ResolveTokenRejectsUnboundAppBeforeExtensionIO(t *testing.T) {
-	tests := []struct {
-		name  string
-		appID string
-	}{
-		{name: "empty app id"},
-		{name: "different app id", appID: "other_app"},
-	}
-
-	for _, tt := range tests {
-		for _, sourceName := range []string{"env", "authsidecar"} {
-			t.Run(tt.name+"/"+sourceName, func(t *testing.T) {
-				provider := &mockExtProvider{
-					name:    sourceName,
-					account: &extcred.Account{AppID: "ext_app", Brand: "feishu"},
-					token:   &extcred.Token{Value: "ext_tok", Source: sourceName},
-				}
-				httpClientCalls := 0
-				cp := NewCredentialProvider(
-					[]extcred.Provider{provider},
-					&mockDefaultAcct{account: &Account{AppID: "default_app"}},
-					&mockDefaultToken{result: &TokenResult{Token: "default_tok"}},
-					func() (*http.Client, error) {
-						httpClientCalls++
-						return nil, errors.New("unexpected user_info call")
-					},
-				)
-
-				_, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: tt.appID})
-				if err == nil {
-					t.Fatal("ResolveToken() error = nil, want app binding error")
-				}
-				assertInternalUnknownWithRetryHint(t, err)
-				if provider.tokenCalls != 0 {
-					t.Fatalf("extension ResolveToken() calls = %d, want 0", provider.tokenCalls)
-				}
-				if httpClientCalls != 0 {
-					t.Fatalf("httpClient() calls = %d, want 0", httpClientCalls)
-				}
-			})
-		}
-	}
-}
-
-func TestCredentialProvider_ResolveTokenRejectsUnboundAppBeforeDefaultIO(t *testing.T) {
-	tests := []struct {
-		name  string
-		appID string
-	}{
-		{name: "empty app id"},
-		{name: "different app id", appID: "other_app"},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			defaultToken := &mockDefaultToken{result: &TokenResult{Token: "default_tok"}}
-			cp := NewCredentialProvider(
-				nil,
-				&mockDefaultAcct{account: &Account{AppID: "default_app"}},
-				defaultToken,
-				nil,
-			)
-
-			_, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: tt.appID})
-			if err == nil {
-				t.Fatal("ResolveToken() error = nil, want app binding error")
-			}
-			assertInternalUnknownWithRetryHint(t, err)
-			if defaultToken.tokenCalls != 0 {
-				t.Fatalf("default ResolveToken() calls = %d, want 0", defaultToken.tokenCalls)
-			}
-		})
-	}
-}
-
-func TestCredentialProvider_ResolveTokenRejectsNilAccountBeforeTokenIO(t *testing.T) {
-	defaultToken := &mockDefaultToken{result: &TokenResult{Token: "default_tok"}}
-	cp := NewCredentialProvider(
-		nil,
-		&mockDefaultAcct{},
-		defaultToken,
-		nil,
-	)
-
-	_, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: "requested_app"})
-	if err == nil {
-		t.Fatal("ResolveToken() error = nil, want nil account error")
-	}
-	assertInternalUnknownWithRetryHint(t, err)
-	if defaultToken.tokenCalls != 0 {
-		t.Fatalf("default ResolveToken() calls = %d, want 0", defaultToken.tokenCalls)
-	}
-}
-
-func TestCredentialProvider_ResolveTokenRejectsMissingSelectedSourceWithoutFallback(t *testing.T) {
-	extension := &mockExtProvider{
-		name:  "env",
-		token: &extcred.Token{Value: "ext_tok", Source: "env"},
-	}
-	defaultToken := &mockDefaultToken{result: &TokenResult{Token: "default_tok"}}
-	cp := NewCredentialProvider(
-		[]extcred.Provider{extension},
-		&mockDefaultAcct{account: &Account{AppID: "default_app"}},
-		defaultToken,
-		nil,
-	)
-	cp.account = &Account{AppID: "selected_app"}
-	cp.accountOnce.Do(func() {})
-
-	_, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: "selected_app"})
-	if err == nil {
-		t.Fatal("ResolveToken() error = nil, want missing selected source error")
-	}
-	assertInternalUnknownWithRetryHint(t, err)
-	if extension.tokenCalls != 0 {
-		t.Fatalf("extension ResolveToken() calls = %d, want 0", extension.tokenCalls)
-	}
-	if defaultToken.tokenCalls != 0 {
-		t.Fatalf("default ResolveToken() calls = %d, want 0", defaultToken.tokenCalls)
-	}
-}
-
-func TestCredentialProvider_ResolveTokenMatchingExtensionDoesNotEnrichIdentity(t *testing.T) {
-	provider := &mockExtProvider{
-		name:    "env",
-		account: &extcred.Account{AppID: "ext_app", Brand: "feishu"},
-		token:   &extcred.Token{Value: "ext_tok", Source: "env"},
-	}
-	httpClientCalls := 0
-	cp := NewCredentialProvider(
-		[]extcred.Provider{provider},
-		nil,
-		nil,
-		func() (*http.Client, error) {
-			httpClientCalls++
-			return nil, errors.New("unexpected user_info call")
-		},
-	)
-
-	result, err := cp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: "ext_app"})
-	if err != nil {
-		t.Fatalf("ResolveToken() error = %v", err)
-	}
-	if result.Token != "ext_tok" {
-		t.Fatalf("ResolveToken() token = %q, want %q", result.Token, "ext_tok")
-	}
-	if provider.tokenCalls != 1 {
-		t.Fatalf("extension ResolveToken() calls = %d, want 1", provider.tokenCalls)
-	}
-	if httpClientCalls != 0 {
-		t.Fatalf("httpClient() calls = %d, want 0", httpClientCalls)
-	}
-}
-
-func assertInternalUnknownWithRetryHint(t *testing.T, err error) {
-	t.Helper()
-	problem, ok := errs.ProblemOf(err)
-	if !ok {
-		t.Fatalf("error type = %T, want typed internal error", err)
-	}
-	if problem.Category != errs.CategoryInternal || problem.Subtype != errs.SubtypeUnknown {
-		t.Fatalf("error problem = %+v, want internal/unknown", problem)
-	}
-	if problem.Hint != "retry the command." {
-		t.Fatalf("error hint = %q, want retry hint", problem.Hint)
-	}
 }
 
 func TestActiveExtensionProviderName_ExtActive(t *testing.T) {

internal/credential/decide_test.go

@@ -1,181 +0,0 @@
-// Copyright (c) 2026 Lark Technologies Pte. Ltd.
-// SPDX-License-Identifier: MIT
-
-package credential
-
-import (
-	"context"
-	"testing"
-
-	"github.com/larksuite/cli/errs"
-	extcred "github.com/larksuite/cli/extension/credential"
-	"github.com/larksuite/cli/internal/core"
-	"github.com/larksuite/cli/internal/envvars"
-)
-
-// stubDecideProvider satisfies extcred.Provider for building providerAccount
-// literals; decideIdentity only ever calls Name() on it.
-type stubDecideProvider struct{ name string }
-
-func (s stubDecideProvider) Name() string  { return s.name }
-func (s stubDecideProvider) Priority() int { return 0 }
-func (s stubDecideProvider) ResolveAccount(context.Context) (*extcred.Account, error) {
-	return nil, nil
-}
-func (s stubDecideProvider) ResolveToken(context.Context, extcred.TokenSpec) (*extcred.Token, error) {
-	return nil, nil
-}
-
-func pa(providerName, appID string) *providerAccount {
-	return &providerAccount{
-		acct:   &Account{AppID: appID},
-		source: extensionTokenSource{provider: stubDecideProvider{name: providerName}},
-	}
-}
-
-func appIDOnlyBlock(appID string) *extcred.BlockError {
-	return &extcred.BlockError{
-		Provider:      "env",
-		Reason:        envvars.CliAppID + " is set but no app secret or access token is available",
-		Code:          extcred.BlockReasonCredentialIncomplete,
-		RequiredAnyOf: []string{envvars.CliAppSecret, envvars.CliUserAccessToken, envvars.CliTenantAccessToken},
-		PresentKeys:   []string{envvars.CliAppID},
-		AppID:         appID,
-	}
-}
-
-func uatOnlyBlock() *extcred.BlockError {
-	return &extcred.BlockError{
-		Provider:    "env",
-		Reason:      envvars.CliUserAccessToken + " is set but " + envvars.CliAppID + " is missing",
-		Code:        extcred.BlockReasonCredentialIncomplete,
-		MissingKeys: []string{envvars.CliAppID},
-		PresentKeys: []string{envvars.CliUserAccessToken},
-	}
-}
-
-// TestDecideIdentity exercises the selection matrix as data: decideIdentity is
-// pure, so every rule (precedence, conflict detection, error attribution) is
-// table-testable without env vars or config fixtures.
-func TestDecideIdentity(t *testing.T) {
-	tenantA := &core.MultiAppConfig{
-		CurrentApp: "tenant_a",
-		Apps:       []core.AppConfig{{Name: "tenant_a", AppId: "cli_a"}},
-	}
-	noCurrent := &core.MultiAppConfig{
-		Apps: []core.AppConfig{{Name: "tenant_a", AppId: "cli_a"}},
-	}
-	invalidConfigErr := errs.NewConfigError(errs.SubtypeInvalidConfig, "invalid config format")
-	notConfiguredErr := core.NotConfiguredError()
-
-	cases := []struct {
-		name    string
-		in      identityInputs
-		route   credentialRoute
-		source  CredentialSourceKind
-		matched bool
-		subtype errs.Subtype // "" = success expected
-	}{
-		{
-			name:   "managed provider wins over explicit profile",
-			in:     identityInputs{profile: "tenant_a", profileSrc: SourceFlagProfile, managed: pa("sidecar", "sidecar_app"), config: tenantA},
-			route:  routeManaged,
-			source: SourceExtension("sidecar"),
-		},
-		{
-			name:    "profile conflicts with complete direct env app_id",
-			in:      identityInputs{profile: "tenant_a", profileSrc: SourceFlagProfile, direct: pa("env", "cli_x"), directKeys: []string{envvars.CliAppID, envvars.CliAppSecret}, config: tenantA},
-			subtype: errs.SubtypeProfileAppCredentialConflict,
-		},
-		{
-			name:    "matched complete direct env yields profile route",
-			in:      identityInputs{profile: "tenant_a", profileSrc: SourceEnvProfile, direct: pa("env", "cli_a"), directKeys: []string{envvars.CliAppID, envvars.CliAppSecret}, config: tenantA},
-			route:   routeProfile,
-			source:  SourceEnvProfile,
-			matched: true,
-		},
-		{
-			name:    "APP_ID-only block matching the profile yields profile route",
-			in:      identityInputs{profile: "tenant_a", profileSrc: SourceFlagProfile, directBlock: appIDOnlyBlock("cli_a"), directKeys: []string{envvars.CliAppID}, config: tenantA},
-			route:   routeProfile,
-			source:  SourceFlagProfile,
-			matched: true,
-		},
-		{
-			name:    "APP_ID-only block mismatching the profile is a hard conflict",
-			in:      identityInputs{profile: "tenant_a", profileSrc: SourceFlagProfile, directBlock: appIDOnlyBlock("cli_x"), directKeys: []string{envvars.CliAppID}, config: tenantA},
-			subtype: errs.SubtypeProfileAppCredentialConflict,
-		},
-		{
-			name:    "UAT-only block with a valid profile keeps the repair error",
-			in:      identityInputs{profile: "tenant_a", profileSrc: SourceFlagProfile, directBlock: uatOnlyBlock(), config: tenantA},
-			subtype: errs.SubtypeAppCredentialIncomplete,
-		},
-		{
-			name:    "block without profile is app_credential_incomplete",
-			in:      identityInputs{directBlock: appIDOnlyBlock("cli_a"), directKeys: []string{envvars.CliAppID}},
-			subtype: errs.SubtypeAppCredentialIncomplete,
-		},
-		{
-			name:   "complete direct env without profile wins",
-			in:     identityInputs{direct: pa("env", "cli_env"), directKeys: []string{envvars.CliAppID, envvars.CliAppSecret}},
-			route:  routeDirectEnv,
-			source: SourceEnvAppID,
-		},
-		{
-			name:    "malformed config is not masked as profile_not_found",
-			in:      identityInputs{profile: "tenant_a", profileSrc: SourceFlagProfile, configErr: invalidConfigErr},
-			subtype: errs.SubtypeInvalidConfig,
-		},
-		{
-			name:    "absent config degrades to profile_not_found",
-			in:      identityInputs{profile: "ghost", profileSrc: SourceEnvProfile, configErr: notConfiguredErr},
-			subtype: errs.SubtypeProfileNotFound,
-		},
-		{
-			name:    "profile missing from a valid config is profile_not_found even with incomplete env",
-			in:      identityInputs{profile: "ghost", profileSrc: SourceEnvProfile, directBlock: appIDOnlyBlock("cli_a"), directKeys: []string{envvars.CliAppID}, config: tenantA},
-			subtype: errs.SubtypeProfileNotFound,
-		},
-		{
-			name:   "config default reports currentApp",
-			in:     identityInputs{config: tenantA},
-			route:  routeConfigDefault,
-			source: SourceConfigCurrentApp,
-		},
-		{
-			name:   "config default without currentApp reports firstApp",
-			in:     identityInputs{config: noCurrent},
-			route:  routeConfigDefault,
-			source: SourceConfigFirstApp,
-		},
-	}
-
-	for _, tc := range cases {
-		t.Run(tc.name, func(t *testing.T) {
-			d, err := decideIdentity(tc.in)
-			if tc.subtype != "" {
-				if err == nil {
-					t.Fatalf("decideIdentity = %+v, want error subtype %q", d, tc.subtype)
-				}
-				prob, ok := errs.ProblemOf(err)
-				if !ok || prob.Subtype != tc.subtype {
-					t.Fatalf("error = %v, want subtype %q", err, tc.subtype)
-				}
-				return
-			}
-			if err != nil {
-				t.Fatalf("decideIdentity: %v", err)
-			}
-			if d.route != tc.route {
-				t.Errorf("route = %d, want %d", d.route, tc.route)
-			}
-			if d.selection.Source != tc.source {
-				t.Errorf("source = %q, want %q", d.selection.Source, tc.source)
-			}
-			if d.selection.DirectCredentialEnv.Matched != tc.matched {
-				t.Errorf("matched = %v, want %v", d.selection.DirectCredentialEnv.Matched, tc.matched)
-			}
-		})
-	}
-}

internal/credential/default_provider.go

@@ -74,13 +74,9 @@ func NewDefaultAccountProvider(kc func() keychain.KeychainAccess, profile string
 
 func (p *DefaultAccountProvider) ResolveAccount(ctx context.Context) (*Account, error) {
 	// Load config once — used for both credentials and strict mode.
-	// LoadOrNotConfigured distinguishes an absent config (→ not_configured)
-	// from a malformed/unreadable one (→ invalid_config with cause), so a
-	// broken config is never masked as "run config init" — matching the
-	// explicit-profile path in doResolveAccount.
-	multi, err := core.LoadOrNotConfigured()
+	multi, err := core.LoadMultiAppConfig()
 	if err != nil {
-		return nil, err
+		return nil, core.NotConfiguredError()
 	}
 
 	cfg, err := core.ResolveConfigFromMulti(multi, p.keychain(), p.profile)
@@ -120,7 +116,6 @@ type DefaultTokenProvider struct {
 
 	tatOnce   sync.Once
 	tatResult *TokenResult
-	tatAppID  string
 	tatErr    error
 }
 
@@ -131,42 +126,21 @@ func NewDefaultTokenProvider(defaultAcct *DefaultAccountProvider, httpClient fun
 func (p *DefaultTokenProvider) ResolveToken(ctx context.Context, req TokenSpec) (*TokenResult, error) {
 	switch req.Type {
 	case TokenTypeUAT:
-		return p.resolveUAT(ctx, req)
+		return p.resolveUAT(ctx)
 	case TokenTypeTAT:
-		return p.resolveTAT(ctx, req)
+		return p.resolveTAT(ctx)
 	default:
 		return nil, fmt.Errorf("unsupported token type: %s", req.Type)
 	}
 }
 
-// checkTokenAppID refuses to hand out a token for a different app than the
-// caller resolved. The token provider re-reads the config, so a concurrent
-// profile edit between account resolution and token resolution could otherwise
-// cross tokens between apps. TokenSpec.AppID is REQUIRED here: an empty value
-// would silently disable the guarantee, so it is rejected rather than skipped.
-func checkTokenAppID(req TokenSpec, resolvedAppID string) error {
-	if req.AppID == "" {
-		return errs.NewInternalError(errs.SubtypeUnknown,
-			"TokenSpec.AppID is required for %s token resolution", req.Type)
-	}
-	if req.AppID == resolvedAppID {
-		return nil
-	}
-	return errs.NewInternalError(errs.SubtypeUnknown,
-		"config changed during resolution: token requested for app %q but the saved profile now resolves to a different app", req.AppID).
-		WithHint("retry the command.")
-}
-
 // resolveUAT resolves a user access token. Not cached (unlike TAT) because UAT
 // may be refreshed between calls and GetValidAccessToken handles its own caching.
-func (p *DefaultTokenProvider) resolveUAT(ctx context.Context, req TokenSpec) (*TokenResult, error) {
+func (p *DefaultTokenProvider) resolveUAT(ctx context.Context) (*TokenResult, error) {
 	acct, err := p.defaultAcct.ResolveAccount(ctx)
 	if err != nil {
 		return nil, err
 	}
-	if err := checkTokenAppID(req, acct.AppID); err != nil {
-		return nil, err
-	}
 	httpClient, err := p.httpClient()
 	if err != nil {
 		return nil, err
@@ -183,36 +157,20 @@ func (p *DefaultTokenProvider) resolveUAT(ctx context.Context, req TokenSpec) (*
 	return &TokenResult{Token: token, Scopes: scopes}, nil
 }
 
-// resolveTAT resolves a tenant access token. The result is cached after the
-// first mint via sync.Once — only the context from that call is used.
-//
-// The account is resolved and checked against the request BEFORE any token
-// work: a mismatched request must not trigger a token mint (network call,
-// quota, audit trail) for the wrong app. The cached result is additionally
-// re-checked on every hit, so a token minted for one app is never served to
-// a request that resolved another.
-func (p *DefaultTokenProvider) resolveTAT(ctx context.Context, req TokenSpec) (*TokenResult, error) {
+// resolveTAT resolves a tenant access token. The result is cached after the first
+// call via sync.Once — only the context from the first call is used.
+func (p *DefaultTokenProvider) resolveTAT(ctx context.Context) (*TokenResult, error) {
+	p.tatOnce.Do(func() {
+		p.tatResult, p.tatErr = p.doResolveTAT(ctx)
+	})
+	return p.tatResult, p.tatErr
+}
+
+func (p *DefaultTokenProvider) doResolveTAT(ctx context.Context) (*TokenResult, error) {
 	acct, err := p.defaultAcct.ResolveAccount(ctx)
 	if err != nil {
 		return nil, err
 	}
-	if err := checkTokenAppID(req, acct.AppID); err != nil {
-		return nil, err
-	}
-	p.tatOnce.Do(func() {
-		p.tatResult, p.tatErr = p.doResolveTAT(ctx, acct)
-		p.tatAppID = acct.AppID
-	})
-	if p.tatErr != nil {
-		return nil, p.tatErr
-	}
-	if err := checkTokenAppID(req, p.tatAppID); err != nil {
-		return nil, err
-	}
-	return p.tatResult, nil
-}
-
-func (p *DefaultTokenProvider) doResolveTAT(ctx context.Context, acct *Account) (*TokenResult, error) {
 	httpClient, err := p.httpClient()
 	if err != nil {
 		return nil, err

internal/credential/default_provider_test.go

@@ -4,15 +4,10 @@
 package credential
 
 import (
-	"context"
 	"errors"
-	"io"
-	"net/http"
-	"strings"
 	"testing"
 
 	"github.com/larksuite/cli/errs"
-	"github.com/larksuite/cli/internal/core"
 )
 
 func TestDefaultTokenProvider_Dispatches(t *testing.T) {
@@ -97,136 +92,3 @@ func TestClassifyTATResponseCode_CodeZeroOtherError_StillTyped(t *testing.T) {
 		t.Fatalf("code-0 invalid_scope must not be a ConfigError, got %T", err)
 	}
 }
-
-func TestCheckTokenAppID(t *testing.T) {
-	if err := checkTokenAppID(TokenSpec{Type: TokenTypeUAT}, "cli_a"); err == nil {
-		t.Fatal("empty requested app must be rejected: it would silently disable the guarantee")
-	}
-	if err := checkTokenAppID(TokenSpec{AppID: "cli_a"}, "cli_a"); err != nil {
-		t.Fatalf("matching app must pass: %v", err)
-	}
-	err := checkTokenAppID(TokenSpec{AppID: "cli_a"}, "cli_b")
-	if err == nil {
-		t.Fatal("mismatched app must be refused")
-	}
-	var ie *errs.InternalError
-	if !errors.As(err, &ie) {
-		t.Fatalf("error type = %T, want *errs.InternalError", err)
-	}
-}
-
-// REAL-path regression for review F2: the token provider re-reads the config,
-// so a profile edit between account resolution and token resolution must not
-// hand a token minted for the new app to a caller that resolved the old one.
-// Uses the real DefaultAccountProvider + DefaultTokenProvider; the HTTP stub
-// makes the network step unreachable, so reaching it proves the app check ran
-// and passed first.
-func TestDefaultTokenProvider_RefusesTokenAfterConfigSwap(t *testing.T) {
-	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
-	writeCfg := func(appID string) {
-		t.Helper()
-		multi := &core.MultiAppConfig{CurrentApp: "tenant_a", Apps: []core.AppConfig{{
-			Name: "tenant_a", AppId: appID, AppSecret: core.PlainSecret("your-secret"), Brand: core.BrandFeishu,
-		}}}
-		if err := core.SaveMultiAppConfig(multi); err != nil {
-			t.Fatalf("SaveMultiAppConfig: %v", err)
-		}
-	}
-	writeCfg("cli_a")
-
-	httpSentinel := errors.New("http client sentinel: unreachable in test")
-	tp := NewDefaultTokenProvider(
-		NewDefaultAccountProvider(nil, "tenant_a"),
-		func() (*http.Client, error) { return nil, httpSentinel },
-		nil,
-	)
-
-	// Matching app: the consistency check passes and resolution proceeds to
-	// the (stubbed) HTTP step.
-	_, err := tp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: "cli_a"})
-	if !errors.Is(err, httpSentinel) {
-		t.Fatalf("err = %v, want the HTTP sentinel (check must pass for a matching app)", err)
-	}
-
-	// The profile now resolves to a different app: the token request that was
-	// arbitrated for cli_a must be refused before any token work happens.
-	writeCfg("cli_b")
-	_, err = tp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeUAT, AppID: "cli_a"})
-	if err == nil || !strings.Contains(err.Error(), "config changed during resolution") {
-		t.Fatalf("err = %v, want config-changed refusal", err)
-	}
-}
-
-// F1 regression: a TAT request for a mismatched app must be refused BEFORE
-// any token work starts — no HTTP client construction, no mint, no cache —
-// otherwise the CLI mints (and caches) a token for the wrong app and only
-// then refuses to return it, leaving auth audit/quota side effects behind.
-func TestDefaultTokenProvider_TATChecksAppBeforeAnyTokenWork(t *testing.T) {
-	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
-	multi := &core.MultiAppConfig{CurrentApp: "tenant_a", Apps: []core.AppConfig{{
-		Name: "tenant_a", AppId: "cli_b", AppSecret: core.PlainSecret("your-secret"), Brand: core.BrandFeishu,
-	}}}
-	if err := core.SaveMultiAppConfig(multi); err != nil {
-		t.Fatalf("SaveMultiAppConfig: %v", err)
-	}
-
-	httpCalled := false
-	tp := NewDefaultTokenProvider(
-		NewDefaultAccountProvider(nil, "tenant_a"),
-		func() (*http.Client, error) { httpCalled = true; return nil, errors.New("http sentinel") },
-		nil,
-	)
-
-	// The profile resolves to cli_b, but the caller arbitrated cli_a.
-	_, err := tp.ResolveToken(context.Background(), TokenSpec{Type: TokenTypeTAT, AppID: "cli_a"})
-	if err == nil || !strings.Contains(err.Error(), "config changed during resolution") {
-		t.Fatalf("err = %v, want config-changed refusal", err)
-	}
-	if httpCalled {
-		t.Fatal("token work started for a mismatched app: the check must run before any HTTP client is built")
-	}
-}
-
-// countingTATTripper serves a canned successful TAT response and counts calls.
-type countingTATTripper struct{ calls int }
-
-func (c *countingTATTripper) RoundTrip(*http.Request) (*http.Response, error) {
-	c.calls++
-	return &http.Response{
-		StatusCode: http.StatusOK,
-		Body:       io.NopCloser(strings.NewReader(`{"code":0,"access_token":"your-access-token"}`)),
-		Header:     http.Header{"Content-Type": []string{"application/json"}},
-	}, nil
-}
-
-// TAT happy path: the first request mints the token over HTTP, the second is
-// served from the sync.Once cache without another HTTP call.
-func TestDefaultTokenProvider_TATSuccessAndCacheHit(t *testing.T) {
-	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
-	multi := &core.MultiAppConfig{CurrentApp: "tenant_a", Apps: []core.AppConfig{{
-		Name: "tenant_a", AppId: "cli_a", AppSecret: core.PlainSecret("your-secret"), Brand: core.BrandFeishu,
-	}}}
-	if err := core.SaveMultiAppConfig(multi); err != nil {
-		t.Fatalf("SaveMultiAppConfig: %v", err)
-	}
-
-	tripper := &countingTATTripper{}
-	tp := NewDefaultTokenProvider(
-		NewDefaultAccountProvider(nil, "tenant_a"),
-		func() (*http.Client, error) { return &http.Client{Transport: tripper}, nil },
-		nil,
-	)
-
-	req := TokenSpec{Type: TokenTypeTAT, AppID: "cli_a"}
-	first, err := tp.ResolveToken(context.Background(), req)
-	if err != nil || first.Token != "your-access-token" {
-		t.Fatalf("first resolve = %+v, %v; want minted token", first, err)
-	}
-	second, err := tp.ResolveToken(context.Background(), req)
-	if err != nil || second.Token != "your-access-token" {
-		t.Fatalf("second resolve = %+v, %v; want cached token", second, err)
-	}
-	if tripper.calls != 1 {
-		t.Fatalf("HTTP calls = %d, want exactly 1 (second resolve must hit the cache)", tripper.calls)
-	}
-}

internal/credential/identity_selection.go

@@ -1,54 +0,0 @@
-// Copyright (c) 2026 Lark Technologies Pte. Ltd.
-// SPDX-License-Identifier: MIT
-
-package credential
-
-// CredentialSourceKind is the wire-stable App/credential selection source.
-type CredentialSourceKind string
-
-const (
-	SourceFlagProfile      CredentialSourceKind = "flag:--profile"
-	SourceEnvProfile       CredentialSourceKind = "env:LARKSUITE_CLI_PROFILE"
-	SourceEnvAppID         CredentialSourceKind = "env:LARKSUITE_CLI_APP_ID"
-	SourceConfigCurrentApp CredentialSourceKind = "config:currentApp"
-	SourceConfigFirstApp   CredentialSourceKind = "config:firstApp"
-
-	// SourceExtensionPrefix prefixes the name of a managed extension provider
-	// that won selection outright (e.g. "extension:sidecar"). With it, an
-	// empty Source is left with exactly one meaning: not resolved.
-	SourceExtensionPrefix CredentialSourceKind = "extension:"
-)
-
-// SourceExtension reports the selection source for a managed extension
-// provider by name.
-func SourceExtension(name string) CredentialSourceKind {
-	return SourceExtensionPrefix + CredentialSourceKind(name)
-}
-
-// DirectCredentialEnv describes the state of direct app credential env vars.
-// It never carries a secret value — only names and the non-sensitive app_id.
-type DirectCredentialEnv struct {
-	Present              bool     `json:"present"`
-	Keys                 []string `json:"keys,omitempty"`
-	AppID                string   `json:"appId,omitempty"`
-	Matched              bool     `json:"matched,omitempty"`
-	ConflictsWithProfile bool     `json:"conflictsWithProfile,omitempty"`
-}
-
-// IdentitySelection is the explainable result of credential selection.
-// It carries NO secret value.
-type IdentitySelection struct {
-	Source              CredentialSourceKind
-	DirectCredentialEnv DirectCredentialEnv
-}
-
-// Explicit reports whether the identity was actively specified by the
-// user/agent (flag or env), which governs no-fallback behavior.
-func (s IdentitySelection) Explicit() bool {
-	switch s.Source {
-	case SourceFlagProfile, SourceEnvProfile, SourceEnvAppID:
-		return true
-	default:
-		return false
-	}
-}

internal/credential/identity_selection_test.go

@@ -1,25 +0,0 @@
-// Copyright (c) 2026 Lark Technologies Pte. Ltd.
-// SPDX-License-Identifier: MIT
-
-package credential
-
-import "testing"
-
-func TestIdentitySelectionExplicit(t *testing.T) {
-	cases := []struct {
-		src      CredentialSourceKind
-		explicit bool
-	}{
-		{SourceFlagProfile, true},
-		{SourceEnvProfile, true},
-		{SourceEnvAppID, true},
-		{SourceConfigCurrentApp, false},
-		{SourceConfigFirstApp, false},
-	}
-	for _, c := range cases {
-		sel := IdentitySelection{Source: c.src}
-		if sel.Explicit() != c.explicit {
-			t.Errorf("source %q: Explicit()=%v want %v", c.src, sel.Explicit(), c.explicit)
-		}
-	}
-}

internal/credential/integration_test.go

@@ -52,24 +52,6 @@ func TestFullChain_EnvWins(t *testing.T) {
 	}
 }
 
-func TestFullChain_EnvRejectsDifferentApp(t *testing.T) {
-	t.Setenv(envvars.CliAppID, "env_app")
-	t.Setenv(envvars.CliAppSecret, "env_secret")
-	t.Setenv(envvars.CliUserAccessToken, "env_uat")
-
-	cp := credential.NewCredentialProvider(
-		[]extcred.Provider{&envprovider.Provider{}},
-		nil, nil, nil,
-	)
-
-	_, err := cp.ResolveToken(context.Background(), credential.TokenSpec{
-		Type: credential.TokenTypeUAT, AppID: "other_app",
-	})
-	if err == nil {
-		t.Fatal("ResolveToken() error = nil, want app binding error")
-	}
-}
-
 func TestFullChain_Fallthrough(t *testing.T) {
 	// env provider returns nil (no env vars set), falls through to default token
 	ep := &envprovider.Provider{}
@@ -77,8 +59,7 @@ func TestFullChain_Fallthrough(t *testing.T) {
 
 	cp := credential.NewCredentialProvider(
 		[]extcred.Provider{ep},
-		&mockDefaultAccountProvider{account: &credential.Account{AppID: "app1"}},
-		mock, nil,
+		nil, mock, nil,
 	)
 	result, err := cp.ResolveToken(context.Background(), credential.TokenSpec{
 		Type: credential.TokenTypeUAT, AppID: "app1",
@@ -91,14 +72,6 @@ func TestFullChain_Fallthrough(t *testing.T) {
 	}
 }
 
-type mockDefaultAccountProvider struct {
-	account *credential.Account
-}
-
-func (m *mockDefaultAccountProvider) ResolveAccount(context.Context) (*credential.Account, error) {
-	return m.account, nil
-}
-
 type mockDefaultTokenProvider struct {
 	token  string
 	scopes string

internal/envvars/envvars.go

@@ -21,7 +21,6 @@ const (
 
 	CliAgentName  = "LARKSUITE_CLI_AGENT_NAME"
 	CliAgentTrace = "LARKSUITE_CLI_AGENT_TRACE"
-	CliProfile    = "LARKSUITE_CLI_PROFILE"
 
 	CliProxyEnable  = "LARKSUITE_CLI_PROXY_ENABLE"
 	CliProxyAddress = "LARKSUITE_CLI_PROXY_ADDRESS"

internal/envvars/read_test.go

@@ -16,16 +16,18 @@ func TestAgentName_EmptyWhenEnvUnset(t *testing.T) {
 }
 
 func TestAgentName_ReturnsCleanValue(t *testing.T) {
-	t.Setenv(CliAgentName, "claude-code")
-	if got := AgentName(); got != "claude-code" {
-		t.Fatalf("AgentName() = %q, want %q", got, "claude-code")
+	const agentName = "sample-agent"
+	t.Setenv(CliAgentName, agentName)
+	if got := AgentName(); got != agentName {
+		t.Fatalf("AgentName() = %q, want %q", got, agentName)
 	}
 }
 
 func TestAgentName_TrimsWhitespace(t *testing.T) {
-	t.Setenv(CliAgentName, "  cursor  ")
-	if got := AgentName(); got != "cursor" {
-		t.Fatalf("AgentName() = %q, want %q (whitespace trimmed)", got, "cursor")
+	const agentName = "sample-agent"
+	t.Setenv(CliAgentName, "  "+agentName+"  ")
+	if got := AgentName(); got != agentName {
+		t.Fatalf("AgentName() = %q, want %q (whitespace trimmed)", got, agentName)
 	}
 }
 

internal/flagalias/flagalias.go

@@ -0,0 +1,192 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+// Package flagalias owns parse-time aliases for Cobra/pflag commands.
+//
+// An alias is another accepted spelling of one canonical flag. It is not a
+// second pflag: parsing an alias resolves to the canonical flag before pflag
+// applies the value, so type, default, Changed state, required/enum/input
+// contracts, and repeated-flag behavior all stay attached to one object.
+//
+// Value conversion for non-equivalent legacy inputs is a business compatibility
+// concern, not an alias. Exact aliases always use the canonical flag's native
+// occurrence semantics; domains must not add a separate conflict policy.
+package flagalias
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+)
+
+// AnnotationAliases is attached to the canonical pflag. Consumers should use
+// Aliases instead of reading the annotation directly.
+const AnnotationAliases = "lark-cli/flag-aliases"
+
+// Spec binds Aliases to one Canonical long-flag name. Names do not include the
+// leading "--".
+type Spec struct {
+	Canonical string
+	Aliases   []string
+}
+
+// Bind installs exact-name aliases on cmd and records them on their canonical
+// pflags for manifest/tooling introspection. Existing pflag normalization is
+// composed first; alias resolution is then applied to the normalized spelling.
+//
+// Bind is intentionally the only production owner of SetNormalizeFunc. It
+// validates the complete accepted-name set before installing alias metadata or
+// a normalizer, so a configuration error cannot leave aliases partially bound.
+func Bind(cmd *cobra.Command, specs []Spec) error {
+	if len(specs) == 0 {
+		return nil
+	}
+	if cmd == nil {
+		return fmt.Errorf("bind flag aliases: command is nil")
+	}
+
+	cmd.InitDefaultHelpFlag()
+	flagSet := cmd.Flags()
+	previous := flagSet.GetNormalizeFunc()
+	normalize := func(name string) string {
+		if previous == nil {
+			return name
+		}
+		return string(previous(flagSet, name))
+	}
+
+	registered := make(map[string]string)
+	collectRegistered(registered, flagSet)
+	collectRegistered(registered, cmd.InheritedFlags())
+
+	// Existing annotations matter when Bind is composed by multiple adapters:
+	// aliases are not independent pflags, so VisitAll alone cannot see them.
+	acceptedAliases := make(map[string]string)
+	collectAnnotatedAliases(acceptedAliases, flagSet, normalize)
+	collectAnnotatedAliases(acceptedAliases, cmd.InheritedFlags(), normalize)
+
+	aliases := make(map[string]string)
+	metadata := make(map[*pflag.Flag][]string)
+	seenCanonical := make(map[string]struct{})
+	for _, spec := range specs {
+		if len(spec.Aliases) == 0 {
+			continue
+		}
+		canonicalFlag := flagSet.Lookup(spec.Canonical)
+		if canonicalFlag == nil {
+			return fmt.Errorf("%s declares aliases for unregistered flag --%s", cmd.CommandPath(), spec.Canonical)
+		}
+		canonical := canonicalFlag.Name
+		if _, exists := seenCanonical[canonical]; exists {
+			return fmt.Errorf("%s declares flag aliases for --%s more than once after normalization", cmd.CommandPath(), canonical)
+		}
+		seenCanonical[canonical] = struct{}{}
+		for _, alias := range spec.Aliases {
+			if err := validateAliasName(alias); err != nil {
+				return fmt.Errorf("%s alias for --%s: %w", cmd.CommandPath(), canonical, err)
+			}
+			normalized := normalize(alias)
+			if normalized == "" {
+				return fmt.Errorf("%s alias --%s for --%s normalizes to an empty name", cmd.CommandPath(), alias, canonical)
+			}
+			if normalized == canonical {
+				return fmt.Errorf("%s declares --%s as an alias of itself (--%s after normalization)", cmd.CommandPath(), alias, canonical)
+			}
+			if existing, ok := registered[normalized]; ok {
+				return fmt.Errorf("%s alias --%s for --%s conflicts with registered flag --%s after normalization", cmd.CommandPath(), alias, canonical, existing)
+			}
+			if existing, ok := acceptedAliases[normalized]; ok {
+				return fmt.Errorf("%s alias --%s for --%s conflicts with existing alias for --%s after normalization to --%s", cmd.CommandPath(), alias, canonical, existing, normalized)
+			}
+			if existing, ok := aliases[normalized]; ok {
+				if existing == canonical {
+					return fmt.Errorf("%s declares duplicate alias --%s for --%s after normalization to --%s", cmd.CommandPath(), alias, canonical, normalized)
+				}
+				return fmt.Errorf("%s alias --%s maps to both --%s and --%s after normalization to --%s", cmd.CommandPath(), alias, existing, canonical, normalized)
+			}
+			aliases[normalized] = canonical
+			metadata[canonicalFlag] = append(metadata[canonicalFlag], alias)
+		}
+	}
+
+	if len(aliases) == 0 {
+		return nil
+	}
+	for flag, names := range metadata {
+		setAliases(flag, append(Aliases(flag), names...))
+	}
+	flagSet.SetNormalizeFunc(func(set *pflag.FlagSet, name string) pflag.NormalizedName {
+		normalized := name
+		if previous != nil {
+			normalized = string(previous(set, name))
+		}
+		if canonical, ok := aliases[normalized]; ok {
+			return pflag.NormalizedName(canonical)
+		}
+		return pflag.NormalizedName(normalized)
+	})
+	return nil
+}
+
+// MustBind is the flag-registration form of Bind. Cobra/pflag registration
+// already treats duplicate or invalid flag definitions as programmer errors;
+// MustBind preserves that startup-fail-fast contract for callers whose mount
+// API does not return an error.
+func MustBind(cmd *cobra.Command, specs []Spec) {
+	if err := Bind(cmd, specs); err != nil {
+		panic(err)
+	}
+}
+
+// Aliases returns a defensive copy of the raw accepted alias spellings stored
+// on a canonical pflag. Alias order matches declaration order.
+func Aliases(flag *pflag.Flag) []string {
+	if flag == nil || len(flag.Annotations) == 0 {
+		return nil
+	}
+	return append([]string(nil), flag.Annotations[AnnotationAliases]...)
+}
+
+func validateAliasName(name string) error {
+	switch {
+	case name == "":
+		return fmt.Errorf("name must not be empty")
+	case strings.HasPrefix(name, "-"):
+		return fmt.Errorf("name %q must not include leading dashes", name)
+	case strings.ContainsAny(name, " \t\r\n"):
+		return fmt.Errorf("name %q must not contain whitespace", name)
+	case strings.Contains(name, "="):
+		return fmt.Errorf("name %q must not contain '='", name)
+	default:
+		return nil
+	}
+}
+
+func collectRegistered(dst map[string]string, set *pflag.FlagSet) {
+	if set == nil {
+		return
+	}
+	set.VisitAll(func(flag *pflag.Flag) {
+		dst[flag.Name] = flag.Name
+	})
+}
+
+func collectAnnotatedAliases(dst map[string]string, set *pflag.FlagSet, normalize func(string) string) {
+	if set == nil {
+		return
+	}
+	set.VisitAll(func(flag *pflag.Flag) {
+		for _, alias := range Aliases(flag) {
+			dst[normalize(alias)] = flag.Name
+		}
+	})
+}
+
+func setAliases(flag *pflag.Flag, aliases []string) {
+	if flag.Annotations == nil {
+		flag.Annotations = make(map[string][]string)
+	}
+	flag.Annotations[AnnotationAliases] = append([]string(nil), aliases...)
+}

internal/flagalias/flagalias_test.go

@@ -0,0 +1,224 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package flagalias
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+)
+
+func TestBindResolvesAliasesToOneCanonicalFlag(t *testing.T) {
+	cmd := &cobra.Command{Use: "messages"}
+	cmd.Flags().String("order", "desc", "message order")
+	if err := cmd.MarkFlagRequired("order"); err != nil {
+		t.Fatal(err)
+	}
+	if err := Bind(cmd, []Spec{{Canonical: "order", Aliases: []string{"sort", "sort-order"}}}); err != nil {
+		t.Fatal(err)
+	}
+
+	if err := cmd.ParseFlags([]string{"--sort-order", "asc"}); err != nil {
+		t.Fatalf("ParseFlags(alias) error = %v", err)
+	}
+	canonical := cmd.Flags().Lookup("order")
+	if got := canonical.Value.String(); got != "asc" {
+		t.Fatalf("canonical value = %q, want asc", got)
+	}
+	if !canonical.Changed {
+		t.Fatal("alias must mark canonical flag Changed")
+	}
+	if err := cmd.ValidateRequiredFlags(); err != nil {
+		t.Fatalf("alias must satisfy required canonical flag: %v", err)
+	}
+	if got := cmd.Flags().Lookup("sort-order"); got != canonical {
+		t.Fatalf("Lookup(alias) = %p, want canonical %p", got, canonical)
+	}
+	if got := Aliases(canonical); strings.Join(got, ",") != "sort,sort-order" {
+		t.Fatalf("Aliases(canonical) = %v", got)
+	}
+	if usage := cmd.Flags().FlagUsages(); strings.Contains(usage, "--sort") {
+		t.Fatalf("aliases leaked into help:\n%s", usage)
+	}
+	var names []string
+	cmd.Flags().VisitAll(func(flag *pflag.Flag) { names = append(names, flag.Name) })
+	if strings.Contains(strings.Join(names, ","), "sort") {
+		t.Fatalf("aliases were registered as independent flags: %v", names)
+	}
+}
+
+func TestBindUsesNativeRepeatedFlagSemantics(t *testing.T) {
+	tests := []struct {
+		name string
+		args []string
+		want string
+	}{
+		{name: "alias last", args: []string{"--order", "asc", "--sort", "desc"}, want: "desc"},
+		{name: "canonical last", args: []string{"--sort", "desc", "--order", "asc"}, want: "asc"},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			cmd := &cobra.Command{Use: "messages"}
+			cmd.Flags().String("order", "", "")
+			if err := Bind(cmd, []Spec{{Canonical: "order", Aliases: []string{"sort"}}}); err != nil {
+				t.Fatal(err)
+			}
+			if err := cmd.ParseFlags(test.args); err != nil {
+				t.Fatal(err)
+			}
+			if got, _ := cmd.Flags().GetString("order"); got != test.want {
+				t.Fatalf("order = %q, want %q", got, test.want)
+			}
+		})
+	}
+
+	cmd := &cobra.Command{Use: "messages"}
+	cmd.Flags().StringSlice("fields", nil, "")
+	if err := Bind(cmd, []Spec{{Canonical: "fields", Aliases: []string{"field"}}}); err != nil {
+		t.Fatal(err)
+	}
+	if err := cmd.ParseFlags([]string{"--field", "name", "--fields", "status"}); err != nil {
+		t.Fatal(err)
+	}
+	if got, _ := cmd.Flags().GetStringSlice("fields"); strings.Join(got, ",") != "name,status" {
+		t.Fatalf("collection aliases did not accumulate: %v", got)
+	}
+}
+
+func TestBindComposesExistingNormalizer(t *testing.T) {
+	cmd := &cobra.Command{Use: "messages"}
+	cmd.Flags().SetNormalizeFunc(func(_ *pflag.FlagSet, name string) pflag.NormalizedName {
+		return pflag.NormalizedName(strings.ReplaceAll(name, "_", "-"))
+	})
+	cmd.Flags().String("order", "", "")
+	if err := Bind(cmd, []Spec{{Canonical: "order", Aliases: []string{"sort-order"}}}); err != nil {
+		t.Fatal(err)
+	}
+	if err := cmd.ParseFlags([]string{"--sort_order", "asc"}); err != nil {
+		t.Fatal(err)
+	}
+	if got, _ := cmd.Flags().GetString("order"); got != "asc" {
+		t.Fatalf("order = %q, want asc", got)
+	}
+}
+
+func TestBindRejectsDuplicateCanonicalAfterNormalization(t *testing.T) {
+	cmd := &cobra.Command{Use: "messages"}
+	cmd.Flags().SetNormalizeFunc(func(_ *pflag.FlagSet, name string) pflag.NormalizedName {
+		return pflag.NormalizedName(strings.ReplaceAll(name, "_", "-"))
+	})
+	cmd.Flags().String("sort-order", "", "")
+
+	err := Bind(cmd, []Spec{
+		{Canonical: "sort_order", Aliases: []string{"order"}},
+		{Canonical: "sort-order", Aliases: []string{"ordering"}},
+	})
+	if err == nil || !strings.Contains(err.Error(), "more than once after normalization") {
+		t.Fatalf("Bind() error = %v", err)
+	}
+	if got := Aliases(cmd.Flags().Lookup("sort-order")); len(got) != 0 {
+		t.Fatalf("failed bind partially mutated annotations: %v", got)
+	}
+}
+
+func TestBindRejectsAcceptedNameCollisionsWithoutMutation(t *testing.T) {
+	tests := []struct {
+		name  string
+		setup func(*cobra.Command)
+		specs []Spec
+		want  string
+	}{
+		{
+			name: "registered canonical",
+			setup: func(cmd *cobra.Command) {
+				cmd.Flags().String("order", "", "")
+				cmd.Flags().String("query", "", "")
+			},
+			specs: []Spec{{Canonical: "order", Aliases: []string{"query"}}},
+			want:  "conflicts with registered flag --query",
+		},
+		{
+			name: "ambiguous alias",
+			setup: func(cmd *cobra.Command) {
+				cmd.Flags().String("order", "", "")
+				cmd.Flags().String("field", "", "")
+			},
+			specs: []Spec{
+				{Canonical: "order", Aliases: []string{"sort"}},
+				{Canonical: "field", Aliases: []string{"sort"}},
+			},
+			want: "maps to both",
+		},
+		{
+			name: "normalized collision",
+			setup: func(cmd *cobra.Command) {
+				cmd.Flags().SetNormalizeFunc(func(_ *pflag.FlagSet, name string) pflag.NormalizedName {
+					return pflag.NormalizedName(strings.ReplaceAll(name, "_", "-"))
+				})
+				cmd.Flags().String("order", "", "")
+				cmd.Flags().String("sort-order", "", "")
+			},
+			specs: []Spec{{Canonical: "order", Aliases: []string{"sort_order"}}},
+			want:  "after normalization",
+		},
+		{
+			name: "invalid spelling",
+			setup: func(cmd *cobra.Command) {
+				cmd.Flags().String("order", "", "")
+			},
+			specs: []Spec{{Canonical: "order", Aliases: []string{"--sort"}}},
+			want:  "must not include leading dashes",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			cmd := &cobra.Command{Use: "messages"}
+			test.setup(cmd)
+			err := Bind(cmd, test.specs)
+			if err == nil || !strings.Contains(err.Error(), test.want) {
+				t.Fatalf("Bind() error = %v, want %q", err, test.want)
+			}
+			if got := Aliases(cmd.Flags().Lookup("order")); len(got) != 0 {
+				t.Fatalf("failed bind partially mutated annotations: %v", got)
+			}
+		})
+	}
+}
+
+func TestBindRejectsInheritedFlagCollision(t *testing.T) {
+	parent := &cobra.Command{Use: "root"}
+	parent.PersistentFlags().String("profile", "", "")
+	child := &cobra.Command{Use: "messages"}
+	child.Flags().String("order", "", "")
+	parent.AddCommand(child)
+
+	err := Bind(child, []Spec{{Canonical: "order", Aliases: []string{"profile"}}})
+	if err == nil || !strings.Contains(err.Error(), "registered flag --profile") {
+		t.Fatalf("Bind() error = %v", err)
+	}
+}
+
+func TestBindCanComposeIndependentAdapters(t *testing.T) {
+	cmd := &cobra.Command{Use: "messages"}
+	cmd.Flags().String("order", "", "")
+	cmd.Flags().String("query", "", "")
+	if err := Bind(cmd, []Spec{{Canonical: "order", Aliases: []string{"sort"}}}); err != nil {
+		t.Fatal(err)
+	}
+	if err := Bind(cmd, []Spec{{Canonical: "query", Aliases: []string{"keyword"}}}); err != nil {
+		t.Fatal(err)
+	}
+	if err := cmd.ParseFlags([]string{"--sort", "asc", "--keyword", "launch"}); err != nil {
+		t.Fatal(err)
+	}
+	if got, _ := cmd.Flags().GetString("order"); got != "asc" {
+		t.Fatalf("order = %q", got)
+	}
+	if got, _ := cmd.Flags().GetString("query"); got != "launch" {
+		t.Fatalf("query = %q", got)
+	}
+}

internal/httpmock/registry.go

@@ -38,6 +38,10 @@ type Stub struct {
 	// matches after the first hit. Each match appends to CapturedBodies.
 	Reusable bool
 
+	// Optional (optional): when true, Verify does not require this stub to be
+	// matched. Useful for negative assertions via OnMatch.
+	Optional bool
+
 	// CapturedHeaders records the request headers of the matched request.
 	// Populated after RoundTrip matches this stub.
 	CapturedHeaders http.Header
@@ -137,6 +141,9 @@ func (r *Registry) Verify(t testing.TB) {
 		if s.matched {
 			continue
 		}
+		if s.Optional {
+			continue
+		}
 		// Reusable stubs never set s.matched; treat any captured hit as a match.
 		if s.Reusable && len(s.CapturedBodies) > 0 {
 			continue

internal/output/emit.go

@@ -4,6 +4,7 @@
 package output
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -58,3 +59,25 @@ func WriteAlertWarning(w io.Writer, alert *extcs.Alert) error {
 		alert.Provider, strings.Join(alert.MatchedRules, ", "))
 	return err
 }
+
+// writePaginationDiagnostic reports a record stream's pagination outcome on the
+// diagnostics stream, as one JSON object per line.
+//
+// A record stream has no envelope to carry meta, so without this a result
+// truncated by --page-limit is byte-identical to a complete one — the reader
+// cannot tell "these are all the records" from "these are the first 500". It is
+// JSON rather than prose because the reader that needs it is a program.
+func writePaginationDiagnostic(w io.Writer, meta PaginationMeta) error {
+	payload := struct {
+		Diagnostic string `json:"_diagnostic"`
+		PaginationMeta
+	}{Diagnostic: "pagination", PaginationMeta: meta}
+	encoded, err := json.Marshal(payload)
+	if err != nil {
+		return wrapOutputError("render", err)
+	}
+	if _, err := fmt.Fprintf(w, "%s\n", encoded); err != nil {
+		return wrapOutputError("write", err)
+	}
+	return nil
+}

internal/output/emitter.go

@@ -8,7 +8,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"maps"
 
 	"github.com/larksuite/cli/errs"
 )
@@ -36,9 +35,11 @@ type EmitterConfig struct {
 // EmitOptions describes one result's wire representation.
 //
 // The format contract is explicit: JSON (including the empty default) uses an
-// Envelope; pretty, table, csv, and ndjson render naked business data. JQ takes
-// precedence over Format and filters the JSON Envelope. Raw affects only JSON
-// envelope encoding and jq's complex-value encoding.
+// Envelope. Pretty and table render business data plus a human pagination
+// summary when supplied; csv and ndjson keep stdout as naked records and put
+// pagination metadata on the diagnostics stream. JQ takes precedence over
+// Format and filters the JSON Envelope. Raw affects only JSON envelope encoding
+// and jq's complex-value encoding.
 //
 // JQSafetyWarning preserves the legacy difference between RuntimeContext.emit
 // (false) and WriteSuccessEnvelope (true) until their callers are migrated.
@@ -94,8 +95,8 @@ func NewEmitter(config EmitterConfig) *Emitter {
 }
 
 // Success scans and emits one command result by composing the package's leaf
-// primitives. JSON and jq use the standard envelope; pretty, table, csv, and
-// ndjson render the business value directly.
+// primitives. JSON and jq use the standard envelope; record formats keep their
+// stdout payload free of envelope metadata.
 func (e *Emitter) Success(data interface{}, opts EmitOptions) error {
 	if err := e.requireOutput(); err != nil {
 		return err
@@ -104,14 +105,23 @@ func (e *Emitter) Success(data interface{}, opts EmitOptions) error {
 	if opts.JQ != "" {
 		return e.emitEnvelope(data, true, opts)
 	}
-
-	switch opts.Format {
-	case "", "json":
-		return e.emitEnvelope(data, true, opts)
-	case "pretty":
+	if opts.Format == "pretty" {
 		return e.emitPretty(data, opts)
+	}
+
+	format, known := ParseFormat(opts.Format)
+	if !known {
+		fmt.Fprintf(e.errOut, "warning: unknown format %q, falling back to json\n", opts.Format)
+		return e.emitEnvelope(data, true, opts)
+	}
+	switch format {
+	case FormatJSON:
+		return e.emitEnvelope(data, true, opts)
+	case FormatTable, FormatCSV, FormatNDJSON:
+		return e.emitFormatted(data, format, opts.Meta)
 	default:
-		return e.emitFormatted(data, opts.Format)
+		return errs.NewInternalError(errs.SubtypeUnknown,
+			"unsupported output format %q", format)
 	}
 }
 
@@ -245,7 +255,10 @@ func (e *Emitter) emitPretty(data interface{}, opts EmitOptions) error {
 	}
 	if opts.Pretty != nil {
 		return e.emit(func(w io.Writer) error {
-			return opts.Pretty(w, e.colorEnabled)
+			if err := opts.Pretty(w, e.colorEnabled); err != nil {
+				return err
+			}
+			return writePaginationSummary(w, opts.Meta)
 		})
 	}
 
@@ -255,7 +268,10 @@ func (e *Emitter) emitPretty(data interface{}, opts EmitOptions) error {
 	return e.emitEnvelope(data, true, opts)
 }
 
-func (e *Emitter) emitFormatted(data interface{}, rawFormat string) error {
+// emitFormatted handles only non-envelope formats. JSON, jq, and unknown-format
+// fallback are resolved by Success before reaching this function, so there is
+// exactly one JSON success contract: the standard Envelope.
+func (e *Emitter) emitFormatted(data interface{}, format Format, meta *Meta) error {
 	scanResult := ScanForSafety(e.commandPath, data, e.errOut)
 	if scanResult.Blocked {
 		return scanResult.BlockErr
@@ -266,43 +282,49 @@ func (e *Emitter) emitFormatted(data interface{}, rawFormat string) error {
 		}
 	}
 
-	format, known := ParseFormat(rawFormat)
-	if !known && e.errOut != nil {
-		fmt.Fprintf(e.errOut, "warning: unknown format %q, falling back to json\n", rawFormat)
+	switch format {
+	case FormatTable:
+		return e.emit(func(w io.Writer) error {
+			if err := WriteFormatted(w, data, format); err != nil {
+				return err
+			}
+			return writePaginationSummary(w, meta)
+		})
+	case FormatCSV, FormatNDJSON:
+		if err := e.emit(func(w io.Writer) error {
+			return WriteFormatted(w, data, format)
+		}); err != nil {
+			return err
+		}
+		if meta == nil || meta.Pagination == nil {
+			return nil
+		}
+		return writePaginationDiagnostic(e.errOut, *meta.Pagination)
+	default:
+		return errs.NewInternalError(errs.SubtypeUnknown,
+			"non-envelope emitter received unsupported format %q", format)
 	}
-	if format == FormatJSON {
-		return e.printLegacyDataJSON(data)
-	}
-	return e.emit(func(w io.Writer) error {
-		return WriteFormatted(w, data, format)
-	})
 }
 
-type emitterDataMap map[string]interface{}
-
-// printLegacyDataJSON matches FormatValue's JSON branch while sourcing notice
-// data from this Emitter instead of PrintJson's global PendingNotice hook.
-func (e *Emitter) printLegacyDataJSON(data interface{}) error {
-	// Normalise structs / named maps to plain generic types first, exactly as
-	// FormatValue does, so a struct or named-map payload still matches the map
-	// case below and keeps its injected _notice on the unknown-format fallback.
-	data = toGeneric(data)
-	if m, ok := data.(map[string]interface{}); ok {
-		if _, isEnvelope := m["ok"]; isEnvelope {
-			if notice := e.notice(); notice != nil {
-				m = maps.Clone(m)
-				m["_notice"] = notice
-			}
-		}
-		// The named map retains identical JSON bytes while preventing PrintJson
-		// from consulting its legacy global notice hook a second time.
-		return e.emit(func(w io.Writer) error {
-			return WriteJSON(w, emitterDataMap(m))
-		})
+func writePaginationSummary(w io.Writer, meta *Meta) error {
+	if meta == nil || meta.Pagination == nil {
+		return nil
 	}
-	return e.emit(func(w io.Writer) error {
-		return WriteJSON(w, data)
-	})
+	pagination := meta.Pagination
+	status := "complete"
+	if !pagination.Complete {
+		status = "incomplete"
+	}
+	if _, err := fmt.Fprintf(w, "\nPagination: %s (%d page(s), %d item(s))", status, pagination.Pages, pagination.Items); err != nil {
+		return err
+	}
+	if !pagination.Complete && pagination.NextToken != "" {
+		if _, err := fmt.Fprintf(w, "; resume token: %q", pagination.NextToken); err != nil {
+			return err
+		}
+	}
+	_, err := fmt.Fprintln(w)
+	return err
 }
 
 func (e *Emitter) emit(render func(io.Writer) error) error {

internal/output/emitter_contract_test.go

@@ -63,6 +63,127 @@ func TestEmitterSuccessWritesAllBytes(t *testing.T) {
 	}
 }
 
+func TestEmitterPaginationMetadataByFormat(t *testing.T) {
+	t.Setenv("LARKSUITE_CLI_CONTENT_SAFETY_MODE", "off")
+	data := map[string]interface{}{
+		"items": []interface{}{map[string]interface{}{"id": "1", "name": "first"}},
+	}
+	meta := &output.Meta{
+		Count: 1,
+		Pagination: &output.PaginationMeta{
+			Complete:  false,
+			Pages:     2,
+			Items:     1,
+			NextToken: "resume-token",
+		},
+	}
+
+	t.Run("json envelope", func(t *testing.T) {
+		stdout := &bytes.Buffer{}
+		stderr := &bytes.Buffer{}
+		emitter := output.NewEmitter(output.EmitterConfig{
+			Out: stdout, ErrOut: stderr, CommandPath: "lark-cli fixture +emit",
+		})
+		if err := emitter.Success(data, output.EmitOptions{Format: "json", Meta: meta}); err != nil {
+			t.Fatalf("Emitter.Success() error = %v", err)
+		}
+		var envelope output.Envelope
+		if err := json.Unmarshal(stdout.Bytes(), &envelope); err != nil {
+			t.Fatalf("decode stdout: %v", err)
+		}
+		if envelope.Meta == nil || !reflect.DeepEqual(envelope.Meta.Pagination, meta.Pagination) {
+			t.Fatalf("pagination meta = %#v, want %#v", envelope.Meta, meta.Pagination)
+		}
+		if stderr.Len() != 0 {
+			t.Fatalf("json wrote pagination diagnostic to stderr: %q", stderr.String())
+		}
+	})
+
+	t.Run("unknown format falls back to the same json envelope", func(t *testing.T) {
+		stdout := &bytes.Buffer{}
+		stderr := &bytes.Buffer{}
+		emitter := output.NewEmitter(output.EmitterConfig{
+			Out: stdout, ErrOut: stderr, CommandPath: "lark-cli fixture +emit",
+		})
+		if err := emitter.Success(data, output.EmitOptions{Format: "yaml", Meta: meta}); err != nil {
+			t.Fatalf("Emitter.Success() error = %v", err)
+		}
+		var envelope output.Envelope
+		if err := json.Unmarshal(stdout.Bytes(), &envelope); err != nil {
+			t.Fatalf("fallback stdout is not one complete JSON envelope: %v\n%s", err, stdout.String())
+		}
+		if envelope.Meta == nil || !reflect.DeepEqual(envelope.Meta.Pagination, meta.Pagination) {
+			t.Fatalf("fallback pagination meta = %#v, want %#v", envelope.Meta, meta.Pagination)
+		}
+		if !strings.Contains(stderr.String(), `warning: unknown format "yaml", falling back to json`) {
+			t.Fatalf("fallback stderr = %q, want unknown-format warning", stderr.String())
+		}
+		if strings.Contains(stderr.String(), `"_diagnostic":"pagination"`) {
+			t.Fatalf("fallback emitted a second pagination contract: %q", stderr.String())
+		}
+	})
+
+	for _, tc := range []struct {
+		name   string
+		format string
+		pretty output.PrettyRenderer
+	}{
+		{name: "pretty", format: "pretty", pretty: func(w io.Writer, _ bool) error {
+			_, err := io.WriteString(w, "first\n")
+			return err
+		}},
+		{name: "table", format: "table"},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			stdout := &bytes.Buffer{}
+			stderr := &bytes.Buffer{}
+			emitter := output.NewEmitter(output.EmitterConfig{
+				Out: stdout, ErrOut: stderr, CommandPath: "lark-cli fixture +emit",
+			})
+			if err := emitter.Success(data, output.EmitOptions{Format: tc.format, Pretty: tc.pretty, Meta: meta}); err != nil {
+				t.Fatalf("Emitter.Success() error = %v", err)
+			}
+			for _, want := range []string{"Pagination: incomplete", "2 page(s)", "1 item(s)", `resume token: "resume-token"`} {
+				if !strings.Contains(stdout.String(), want) {
+					t.Fatalf("stdout = %q, want %q", stdout.String(), want)
+				}
+			}
+			if stderr.Len() != 0 {
+				t.Fatalf("%s wrote pagination diagnostic to stderr: %q", tc.format, stderr.String())
+			}
+		})
+	}
+
+	for _, format := range []string{"ndjson", "csv"} {
+		t.Run(format, func(t *testing.T) {
+			stdout := &bytes.Buffer{}
+			stderr := &bytes.Buffer{}
+			emitter := output.NewEmitter(output.EmitterConfig{
+				Out: stdout, ErrOut: stderr, CommandPath: "lark-cli fixture +emit",
+			})
+			if err := emitter.Success(data, output.EmitOptions{Format: format, Meta: meta}); err != nil {
+				t.Fatalf("Emitter.Success() error = %v", err)
+			}
+			if strings.Contains(stdout.String(), "_diagnostic") || strings.Contains(stdout.String(), "resume-token") {
+				t.Fatalf("%s stdout was polluted by pagination metadata: %q", format, stdout.String())
+			}
+			var diagnostic struct {
+				Diagnostic string `json:"_diagnostic"`
+				Complete   bool   `json:"complete"`
+				Pages      int    `json:"pages"`
+				Items      int    `json:"items"`
+				NextToken  string `json:"next_token"`
+			}
+			if err := json.Unmarshal(bytes.TrimSpace(stderr.Bytes()), &diagnostic); err != nil {
+				t.Fatalf("decode pagination diagnostic %q: %v", stderr.String(), err)
+			}
+			if diagnostic.Diagnostic != "pagination" || diagnostic.Complete || diagnostic.Pages != 2 || diagnostic.Items != 1 || diagnostic.NextToken != "resume-token" {
+				t.Fatalf("pagination diagnostic = %+v", diagnostic)
+			}
+		})
+	}
+}
+
 func TestEmitterMarshalFailureReturnsTypedErrorWithoutOutput(t *testing.T) {
 	t.Setenv("LARKSUITE_CLI_CONTENT_SAFETY_MODE", "off")
 	stdout := &bytes.Buffer{}

internal/output/emitter_legacy_compat_test.go

@@ -269,16 +269,9 @@ func TestEmitterMatchesRuntimeContextLegacyOracle(t *testing.T) {
 				MatchedRules: []string{"fixture-rule"},
 			},
 		},
-		{
-			name: "unknown_format_data_envelope_notice",
-			data: func() interface{} {
-				return map[string]interface{}{"ok": true, "value": "fixture"}
-			},
-			ok:        true,
-			format:    "yaml",
-			useFormat: true,
-			notice:    map[string]interface{}{"skills": map[string]interface{}{"current": "1.0.0"}},
-		},
+		// Unknown-format fallback is intentionally excluded from this frozen
+		// legacy set: it now uses the standard JSON Envelope. The replacement
+		// contract lives in TestEmitterPaginationMetadataByFormat.
 	}
 
 	golden := loadRuntimeContextLegacyGolden(t)
@@ -732,7 +725,7 @@ func TestEmitterCapturesNoticeAndColorDependencies(t *testing.T) {
 		t.Fatalf("Emitter.Success(unknown format) error = %v", err)
 	}
 	if strings.Contains(stdout.String(), "global") || !strings.Contains(stdout.String(), "captured") {
-		t.Fatalf("legacy JSON fallback consulted global notice:\n%s", stdout.String())
+		t.Fatalf("JSON envelope fallback consulted global notice:\n%s", stdout.String())
 	}
 }
 

internal/output/envelope.go

@@ -16,8 +16,24 @@ type Envelope struct {
 
 // Meta carries optional metadata in envelope responses.
 type Meta struct {
-	Count    int    `json:"count,omitempty"`
-	Rollback string `json:"rollback,omitempty"`
+	Count      int             `json:"count,omitempty"`
+	Rollback   string          `json:"rollback,omitempty"`
+	Pagination *PaginationMeta `json:"pagination,omitempty"`
+}
+
+// PaginationMeta reports how a paginated read ended.
+//
+// It lives in the envelope's meta rather than in the business data because a
+// stop reason is not part of the resource: writing it into data both pollutes
+// the payload and forces the caller to tell an API field apart from one the CLI
+// synthesised. Complete plus NextToken is the whole story — a run either
+// exhausted the endpoint or stopped at --page-limit with somewhere to resume —
+// so there is no separate stop_reason string to keep in sync.
+type PaginationMeta struct {
+	Complete  bool   `json:"complete"`
+	Pages     int    `json:"pages"`
+	Items     int    `json:"items"`
+	NextToken string `json:"next_token,omitempty"`
 }
 
 // PendingNotice, if set, returns system-level notices to inject as the

internal/output/testdata/runtime_context_legacy.golden.json

@@ -98,10 +98,6 @@
     "table_with_safety_warning": {
       "stdout": "id  name \n──  ─────\n1   Alice\n",
       "stderr": "warning: content safety alert from emitter-oracle (rules: fixture-rule)\n"
-    },
-    "unknown_format_data_envelope_notice": {
-      "stdout": "{\n  \"_notice\": {\n    \"skills\": {\n      \"current\": \"1.0.0\"\n    }\n  },\n  \"ok\": true,\n  \"value\": \"fixture\"\n}\n",
-      "stderr": "warning: unknown format \"yaml\", falling back to json\n"
     }
   }
 }

internal/qualitygate/cmd/manifest-export/collect.go

@@ -12,6 +12,7 @@ import (
 	rootcmd "github.com/larksuite/cli/cmd"
 	"github.com/larksuite/cli/internal/cmdmeta"
 	"github.com/larksuite/cli/internal/cmdutil"
+	"github.com/larksuite/cli/internal/flagalias"
 	"github.com/larksuite/cli/internal/qualitygate/manifest"
 	"github.com/larksuite/cli/internal/registry"
 	"github.com/spf13/cobra"
@@ -134,6 +135,7 @@ func commandDomain(c *cobra.Command, path string, source manifest.Source) string
 func flagFromPFlag(f *pflag.Flag) manifest.Flag {
 	return manifest.Flag{
 		Name:        f.Name,
+		Aliases:     flagalias.Aliases(f),
 		Shorthand:   f.Shorthand,
 		Usage:       f.Usage,
 		Hidden:      f.Hidden,
@@ -141,7 +143,7 @@ func flagFromPFlag(f *pflag.Flag) manifest.Flag {
 		TakesValue:  f.NoOptDefVal == "",
 		DefValue:    f.DefValue,
 		NoOptValue:  f.NoOptDefVal,
-		Annotations: cloneAnnotations(f.Annotations),
+		Annotations: cloneAnnotations(f.Annotations, flagalias.AnnotationAliases),
 	}
 }
 
@@ -162,13 +164,23 @@ func hasAnnotation(f *pflag.Flag, key string) bool {
 	return ok && len(values) > 0
 }
 
-func cloneAnnotations(in map[string][]string) map[string][]string {
+func cloneAnnotations(in map[string][]string, excluded ...string) map[string][]string {
 	if len(in) == 0 {
 		return nil
 	}
+	skip := make(map[string]struct{}, len(excluded))
+	for _, key := range excluded {
+		skip[key] = struct{}{}
+	}
 	out := make(map[string][]string, len(in))
 	for key, values := range in {
+		if _, ok := skip[key]; ok {
+			continue
+		}
 		out[key] = append([]string(nil), values...)
 	}
+	if len(out) == 0 {
+		return nil
+	}
 	return out
 }

internal/qualitygate/cmd/manifest-export/collect_alias_test.go

@@ -0,0 +1,37 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package main
+
+import (
+	"slices"
+	"testing"
+
+	"github.com/larksuite/cli/internal/flagalias"
+	"github.com/spf13/cobra"
+)
+
+func TestCommandFromCobraExportsAliasesAsFirstClassMetadata(t *testing.T) {
+	root := &cobra.Command{Use: "lark-cli"}
+	cmd := &cobra.Command{Use: "+messages"}
+	cmd.Flags().String("order", "desc", "message order")
+	root.AddCommand(cmd)
+	if err := flagalias.Bind(cmd, []flagalias.Spec{{Canonical: "order", Aliases: []string{"sort", "sort-order"}}}); err != nil {
+		t.Fatal(err)
+	}
+
+	entry := commandFromCobra(cmd, nil)
+	flag := findFlag(entry.Flags, "order")
+	if flag == nil {
+		t.Fatal("manifest is missing canonical --order")
+	}
+	if !slices.Equal(flag.Aliases, []string{"sort", "sort-order"}) {
+		t.Fatalf("manifest aliases = %v", flag.Aliases)
+	}
+	if _, leaked := flag.Annotations[flagalias.AnnotationAliases]; leaked {
+		t.Fatalf("internal alias annotation leaked into manifest: %#v", flag.Annotations)
+	}
+	if findFlag(entry.Flags, "sort") != nil || findFlag(entry.Flags, "sort-order") != nil {
+		t.Fatalf("aliases were exported as independent flags: %#v", entry.Flags)
+	}
+}

internal/qualitygate/cmd/manifest-export/main_test.go

@@ -8,6 +8,7 @@ import (
 	"context"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"github.com/larksuite/cli/internal/qualitygate/manifest"
@@ -90,6 +91,42 @@ func TestCollectContainsDocsFetchAndDryRunFlag(t *testing.T) {
 	}
 }
 
+func TestCollectExportsShortcutAliasesOnCanonicalFlags(t *testing.T) {
+	got, err := collectHandAuthored(context.Background())
+	if err != nil {
+		t.Fatalf("collectHandAuthored() error = %v", err)
+	}
+	tests := []struct {
+		command   string
+		canonical string
+		aliases   []string
+	}{
+		{command: "base +url-resolve", canonical: "url", aliases: []string{"query"}},
+		{command: "im +chat-messages-list", canonical: "order", aliases: []string{"sort-order"}},
+		{command: "sheets +workbook-info", canonical: "spreadsheet-token", aliases: []string{"token"}},
+	}
+	for _, test := range tests {
+		t.Run(test.command+"/"+test.canonical, func(t *testing.T) {
+			cmd := findManifestCommand(&got, test.command)
+			if cmd == nil {
+				t.Fatalf("manifest command %q not found", test.command)
+			}
+			flag := findManifestFlag(cmd, test.canonical)
+			if flag == nil {
+				t.Fatalf("canonical --%s not found", test.canonical)
+			}
+			if strings.Join(flag.Aliases, ",") != strings.Join(test.aliases, ",") {
+				t.Fatalf("aliases = %v, want %v", flag.Aliases, test.aliases)
+			}
+			for _, alias := range test.aliases {
+				if findManifestFlag(cmd, alias) != nil {
+					t.Fatalf("alias --%s exported as an independent flag", alias)
+				}
+			}
+		})
+	}
+}
+
 func TestCollectExcludesGeneratedServiceCommands(t *testing.T) {
 	got, err := collectHandAuthored(context.Background())
 	if err != nil {

internal/qualitygate/config/README.md

@@ -45,6 +45,18 @@ Adding a new row requires approval from the matching CODEOWNERS or quality gate
 
 `legacy-commands.txt` only covers hand-authored legacy commands. Generated OpenAPI service commands are intentionally excluded from `command-manifest.json`; they are included in `command-index.json` only so command references can be checked against the real CLI surface.
 
+## Public Domain Allowlists
+
+`internal/qualitygate/config/allowlists/public-domains.txt` contains supported public hostnames approved for Go source. `fixture-domains.txt` contains test-only hostnames used by `*_test.go`, the repository-root `tests/` directory, or any `testdata/` directory; fixture entries do not apply to production Go files or `skills/`.
+
+Keep one lowercase exact hostname per line, sorted alphabetically. Wildcards, suffix rules, duplicates, schemes, ports, and paths are rejected; approving `larkoffice.com` does not approve its subdomains.
+
+RFC 2606 reserves the `.test`, `.example`, `.invalid`, and `.localhost` namespaces plus the exact names `example.com`, `example.net`, and `example.org`. These names are accepted without an allowlist entry and must not be listed.
+
+Every public entry needs a current non-fixture Go use, evidence that it is a supported public endpoint, and CODEOWNER approval. Other test-only hostnames belong in the fixture list. Tenant-specific, private-control-plane, and internal API hostnames are not eligible.
+
+`lint/domaincontract` validates both lists and scans complete Go files. In CI, unapproved-host findings are limited to values whose expressions intersect added lines; list validation and unused-entry checks remain repository-wide. See `lint/README.md` for scanner semantics.
+
 ## Semantic Blocker Policy
 
 The semantic reviewer can propose findings, but the local gatekeeper recomputes whether each finding is reproducible from `facts.json`. A finding blocks only when all of these are true:

internal/qualitygate/config/allowlists/fixture-domains.txt

@@ -0,0 +1,24 @@
+# Exact test-only hostnames. Keep sorted.
+abc.feishu.cn
+attacker.example.com
+bytedance.feishu.cn
+cdn.feishu.cn
+evil.example.com
+example.feishu.cn
+example.larkoffice.com
+example.larksuite.com
+feishu.cn
+feishu.doubao.com
+gateway.docker.internal
+host.containers.internal
+host.docker.internal
+host.lima.internal
+lf3-static.bytednsdoc.com
+meetings.feishu.cn
+meetings.larksuite.com
+p3-lark-file.byteimg.com
+passport.feishu.cn
+sample.feishu.cn
+x.feishu.cn
+xxx.feishu.cn
+xxx.larksuite.com

internal/qualitygate/config/allowlists/public-domains.txt

@@ -0,0 +1,18 @@
+# Exact public hostnames. Keep sorted.
+accounts.feishu.cn
+accounts.larksuite.com
+applink.feishu.cn
+applink.larksuite.com
+ark.ap-southeast.bytepluses.com
+github.com
+larkoffice.com
+lf-larkemail.bytetos.com
+mcp.feishu.cn
+mcp.larksuite.com
+open.feishu.cn
+open.larksuite.com
+registry.npmjs.org
+registry.npmmirror.com
+sf16-sg.tiktokcdn.com
+www.feishu.cn
+www.larksuite.com

internal/qualitygate/manifest/io_test.go

@@ -19,6 +19,57 @@ func TestValidateRejectsDuplicateCommandPaths(t *testing.T) {
 	}
 }
 
+func TestValidateAcceptsDistinctFlagAliases(t *testing.T) {
+	m := Manifest{SchemaVersion: 1, Commands: []Command{{
+		Path:          "im +messages",
+		CanonicalPath: "im +messages",
+		Source:        SourceShortcut,
+		Flags: []Flag{
+			{Name: "order", Aliases: []string{"sort", "sort-order"}},
+			{Name: "query", Aliases: []string{"keyword"}},
+		},
+	}}}
+	if err := m.Validate(KindCommandManifest); err != nil {
+		t.Fatalf("Validate() error = %v", err)
+	}
+}
+
+func TestValidateRejectsFlagAliasCollisions(t *testing.T) {
+	tests := []struct {
+		name  string
+		flags []Flag
+	}{
+		{
+			name: "alias and canonical",
+			flags: []Flag{
+				{Name: "order", Aliases: []string{"query"}},
+				{Name: "query"},
+			},
+		},
+		{
+			name: "alias and alias",
+			flags: []Flag{
+				{Name: "order", Aliases: []string{"sort"}},
+				{Name: "field", Aliases: []string{"sort"}},
+			},
+		},
+		{
+			name:  "alias self reference",
+			flags: []Flag{{Name: "order", Aliases: []string{"order"}}},
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			m := Manifest{SchemaVersion: 1, Commands: []Command{{
+				Path: "im +messages", CanonicalPath: "im +messages", Source: SourceShortcut, Flags: test.flags,
+			}}}
+			if err := m.Validate(KindCommandManifest); err == nil {
+				t.Fatal("expected alias collision to fail")
+			}
+		})
+	}
+}
+
 func TestValidateRejectsInvalidSource(t *testing.T) {
 	m := Manifest{SchemaVersion: 1, Commands: []Command{
 		{Path: "docs +fetch", CanonicalPath: "docs +fetch", Source: Source("invalid")},

internal/qualitygate/manifest/schema.go

@@ -40,6 +40,7 @@ type Command struct {
 
 type Flag struct {
 	Name        string              `json:"name"`
+	Aliases     []string            `json:"aliases,omitempty"`
 	Shorthand   string              `json:"shorthand,omitempty"`
 	Usage       string              `json:"usage,omitempty"`
 	Hidden      bool                `json:"hidden,omitempty"`
@@ -154,15 +155,24 @@ func validateCommand(kind string, i int, cmd Command) error {
 			return err
 		}
 	}
-	seenFlags := make(map[string]struct{}, len(cmd.Flags))
+	acceptedNames := make(map[string]string, len(cmd.Flags))
 	for j, flag := range cmd.Flags {
 		if err := validateFlag(prefix, j, flag); err != nil {
 			return err
 		}
-		if _, ok := seenFlags[flag.Name]; ok {
+		if existing, ok := acceptedNames[flag.Name]; ok {
+			if existing != flag.Name {
+				return fmt.Errorf("%s flags[%d].name %s conflicts with an alias of --%s", prefix, j, flag.Name, existing)
+			}
 			return fmt.Errorf("%s flags[%d].name is duplicated: %s", prefix, j, flag.Name)
 		}
-		seenFlags[flag.Name] = struct{}{}
+		acceptedNames[flag.Name] = flag.Name
+		for k, alias := range flag.Aliases {
+			if existing, ok := acceptedNames[alias]; ok {
+				return fmt.Errorf("%s flags[%d].aliases[%d] %s conflicts with accepted name of --%s", prefix, j, k, alias, existing)
+			}
+			acceptedNames[alias] = flag.Name
+		}
 	}
 	return nil
 }
@@ -175,6 +185,29 @@ func validateFlag(commandPrefix string, i int, flag Flag) error {
 	if strings.ContainsAny(flag.Name, " \t\r\n") {
 		return fmt.Errorf("%s.name must not contain whitespace", prefix)
 	}
+	seenAliases := make(map[string]struct{}, len(flag.Aliases))
+	for j, alias := range flag.Aliases {
+		aliasPrefix := fmt.Sprintf("%s.aliases[%d]", prefix, j)
+		if err := validateString(aliasPrefix, alias, true); err != nil {
+			return err
+		}
+		if strings.HasPrefix(alias, "-") {
+			return fmt.Errorf("%s must not include leading dashes", aliasPrefix)
+		}
+		if strings.ContainsAny(alias, " \t\r\n") {
+			return fmt.Errorf("%s must not contain whitespace", aliasPrefix)
+		}
+		if strings.Contains(alias, "=") {
+			return fmt.Errorf("%s must not contain '='", aliasPrefix)
+		}
+		if alias == flag.Name {
+			return fmt.Errorf("%s must differ from canonical name %s", aliasPrefix, flag.Name)
+		}
+		if _, ok := seenAliases[alias]; ok {
+			return fmt.Errorf("%s is duplicated: %s", aliasPrefix, alias)
+		}
+		seenAliases[alias] = struct{}{}
+	}
 	for _, item := range []struct {
 		name  string
 		value string

internal/qualitygate/rules/dryrun.go

@@ -199,7 +199,11 @@ func materializePlaceholderExample(raw string, cmd manifest.Command) (materializ
 			if eq := strings.IndexByte(name, '='); eq >= 0 {
 				flagName := name[:eq]
 				flag := findManifestFlag(&cmd, flagName)
-				value, ok := materializePlaceholderValue(name[eq+1:], placeholderContextForFlag(flagName, flag))
+				contextName := flagName
+				if flag != nil {
+					contextName = flag.Name
+				}
+				value, ok := materializePlaceholderValue(name[eq+1:], placeholderContextForFlag(contextName, flag))
 				if !ok {
 					return materializedExample{}, false
 				}
@@ -208,7 +212,7 @@ func materializePlaceholderExample(raw string, cmd manifest.Command) (materializ
 			}
 			flag := findManifestFlag(&cmd, name)
 			if flag != nil && flag.TakesValue && i+1 < len(argv) {
-				value, ok := materializePlaceholderValue(argv[i+1], placeholderContextForFlag(name, flag))
+				value, ok := materializePlaceholderValue(argv[i+1], placeholderContextForFlag(flag.Name, flag))
 				if !ok {
 					return materializedExample{}, false
 				}

internal/qualitygate/rules/refs.go

@@ -6,6 +6,7 @@ package rules
 import (
 	"errors"
 	"fmt"
+	"slices"
 	"strings"
 	"unicode"
 
@@ -170,7 +171,11 @@ func consumeFlags(args []string, cmd *manifest.Command) ([]string, []string, err
 				hasInlineValue = true
 			}
 			flag := findManifestFlag(cmd, name)
-			flags = append(flags, name)
+			acceptedName := name
+			if flag != nil {
+				acceptedName = flag.Name
+			}
+			flags = append(flags, acceptedName)
 			if flag != nil && !hasInlineValue && flag.TakesValue && i+1 < len(args) {
 				i++
 			}
@@ -201,7 +206,7 @@ func isShellOperator(arg string) bool {
 
 func findManifestFlag(cmd *manifest.Command, name string) *manifest.Flag {
 	for i := range cmd.Flags {
-		if cmd.Flags[i].Name == name || cmd.Flags[i].Shorthand == name {
+		if cmd.Flags[i].Name == name || cmd.Flags[i].Shorthand == name || slices.Contains(cmd.Flags[i].Aliases, name) {
 			return &cmd.Flags[i]
 		}
 	}
@@ -241,6 +246,9 @@ func indexManifest(m manifest.Manifest) manifestIndex {
 		flagSet := make(map[string]bool, len(cmd.Flags))
 		for _, fl := range cmd.Flags {
 			flagSet[fl.Name] = true
+			for _, alias := range fl.Aliases {
+				flagSet[alias] = true
+			}
 		}
 		index.flags[cmd.Path] = flagSet
 	}

internal/qualitygate/rules/refs_test.go

@@ -379,6 +379,26 @@ func TestCheckReferencesAllowsHelpFlag(t *testing.T) {
 	}
 }
 
+func TestParseAgainstManifestAcceptsAliasAndCanonicalizesFact(t *testing.T) {
+	m := manifest.Manifest{Commands: []manifest.Command{{
+		Path:     "im +messages",
+		Runnable: true,
+		Flags: []manifest.Flag{{
+			Name: "order", Aliases: []string{"sort-order"}, TakesValue: true,
+		}},
+	}}}
+	got, err := parseAgainstManifest(m, "lark-cli im +messages --sort-order asc")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if strings.Join(got.Flags, ",") != "order" {
+		t.Fatalf("flags = %v, want canonical order", got.Flags)
+	}
+	if index := indexManifest(m); !index.hasFlag("im +messages", "sort-order") {
+		t.Fatal("manifest index did not retain accepted alias name")
+	}
+}
+
 func TestCheckReferencesSkipsTemplateServicePlaceholder(t *testing.T) {
 	m := manifest.Manifest{Commands: []manifest.Command{{Path: "im"}}}
 	ex := skillscan.Example{Raw: "lark-cli im <resource> <method> [flags]", SourceFile: "skills/lark-demo/SKILL.md", Line: 1}

internal/registry/remote.go

@@ -180,8 +180,8 @@ func saveCachedMerged(data []byte, cm CacheMeta) error {
 // localVersion is sent as data_version query param for server-side version comparison.
 // Returns (data, reg, err). A nil reg means the version is unchanged (not modified).
 func fetchRemoteMerged(localVersion string) (data []byte, reg *MergedRegistry, err error) {
-	// Route through the shared proxy-plugin-aware transport so remote API
-	// definition fetches honor proxy plugin mode instead of bypassing it.
+	// Remote metadata is platform traffic and must honor both the shared proxy
+	// configuration and the registered platform transport extension.
 	client := transport.NewHTTPClient(fetchTimeout)
 	req, err := http.NewRequest("GET", remoteMetaURL(localVersion), nil)
 	if err != nil {

internal/riskcontrol/transport.go

@@ -12,6 +12,8 @@ import (
 	internaltransport "github.com/larksuite/cli/internal/transport"
 )
 
+var _ internaltransport.RoundTripperDecorator = (*Transport)(nil)
+
 const (
 	HeaderProductModel = "X-Agent-Device-Type"
 	HeaderOSType       = "X-Agent-Os-Type"
@@ -40,6 +42,28 @@ func NewTransport(next http.RoundTripper, source Source) *Transport {
 	}
 }
 
+// BaseRoundTripper exposes the network transport so policy routers can clone
+// and rebuild the complete decorator graph without dropping risk control.
+func (t *Transport) BaseRoundTripper() http.RoundTripper {
+	if t == nil || t.next == nil {
+		return internaltransport.Fallback()
+	}
+	return t.next
+}
+
+// WithBaseRoundTripper returns an equivalent risk-control boundary over base.
+func (t *Transport) WithBaseRoundTripper(base http.RoundTripper) http.RoundTripper {
+	if t == nil {
+		return NewTransport(base, nil)
+	}
+	cloned := *t
+	if base == nil {
+		base = internaltransport.Fallback()
+	}
+	cloned.next = base
+	return &cloned
+}
+
 // RoundTrip implements http.RoundTripper.
 func (t *Transport) RoundTrip(req *http.Request) (*http.Response, error) {
 	req = req.Clone(req.Context())

internal/transport/config.go

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: MIT
 
 // Package transport owns how the CLI assembles its outbound HTTP transport: the
-// shared base RoundTripper (Shared/Fallback/NewHTTPClient), the LARK_CLI_NO_PROXY
+// shared base RoundTripper (Shared/Fallback and the HTTP client constructors), the LARK_CLI_NO_PROXY
 // direct-egress clone, and the ~/.lark-cli/proxy_config.json proxy-plugin mode.
 //
 // Proxy-plugin mode forces all outbound HTTP(S) requests through a fixed loopback

internal/transport/default_client.go

@@ -0,0 +1,258 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package transport
+
+import (
+	"context"
+	"net/http"
+	"net/url"
+	"strings"
+	"sync"
+
+	larkws "github.com/larksuite/oapi-sdk-go/v3/ws"
+
+	"github.com/larksuite/cli/errs"
+	exttransport "github.com/larksuite/cli/extension/transport"
+	"github.com/larksuite/cli/internal/core"
+)
+
+type requestMatcher func(*http.Request) bool
+type transportPolicyBuilder func(http.RoundTripper) http.RoundTripper
+
+type sdkBootstrapRedirectContextKey struct{}
+
+var (
+	// larkws pins this client during package initialization.
+	sdkBootstrapHTTPClient = http.DefaultClient
+	installDefaultClientMu sync.Mutex
+)
+
+// sdkBootstrapTransport applies the platform HTTP policy only to dependency
+// bootstrap requests selected by match. Unmatched DefaultClient traffic is
+// delegated directly to the previous transport.
+type sdkBootstrapTransport struct {
+	base                http.RoundTripper
+	match               requestMatcher
+	buildPlatformPolicy transportPolicyBuilder
+
+	policyMu sync.RWMutex
+}
+
+func (t *sdkBootstrapTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	if !t.isBootstrapRequest(req) {
+		return t.fallbackTransport().RoundTrip(req)
+	}
+
+	base := t.base
+	if base == nil {
+		// Resolve Shared lazily so bridge installation never initializes
+		// workspace-scoped proxy state ahead of workspace selection.
+		base = Shared()
+	}
+	buildPlatformPolicy := t.platformPolicyBuilder()
+	if buildPlatformPolicy == nil {
+		return nil, errs.NewInternalError(
+			errs.SubtypeUnknown,
+			"SDK bootstrap transport policy is not configured",
+		)
+	}
+	base = buildPlatformPolicy(base)
+	if base == nil {
+		return nil, errs.NewInternalError(
+			errs.SubtypeUnknown,
+			"SDK bootstrap transport policy returned a nil transport",
+		)
+	}
+
+	// Resolve extensions per hop so redirects retain platform policy.
+	extended := WrapWithExtensionForClass(base, exttransport.RequestClassPlatform)
+	guarded := &sameOriginRedirectTransport{base: extended}
+	return guarded.RoundTrip(req)
+}
+
+func (t *sdkBootstrapTransport) platformPolicyBuilder() transportPolicyBuilder {
+	t.policyMu.RLock()
+	defer t.policyMu.RUnlock()
+	return t.buildPlatformPolicy
+}
+
+func (t *sdkBootstrapTransport) setPlatformPolicyBuilder(build transportPolicyBuilder) {
+	t.policyMu.Lock()
+	t.buildPlatformPolicy = build
+	t.policyMu.Unlock()
+}
+
+func (t *sdkBootstrapTransport) isBootstrapRequest(req *http.Request) bool {
+	if req == nil {
+		return false
+	}
+	if _, redirected := req.Context().Value(sdkBootstrapRedirectContextKey{}).(struct{}); redirected {
+		return true
+	}
+	return t.match != nil && t.match(req)
+}
+
+func (t *sdkBootstrapTransport) fallbackTransport() http.RoundTripper {
+	if t.base != nil {
+		return t.base
+	}
+	// Preserve net/http's dynamic nil-Transport fallback.
+	return http.DefaultTransport
+}
+
+// sameOriginRedirectTransport rejects redirects before net/http can replay a
+// bootstrap request to a different logical origin.
+type sameOriginRedirectTransport struct {
+	base http.RoundTripper
+}
+
+func (t *sameOriginRedirectTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	resp, err := t.base.RoundTrip(req)
+	if err != nil || resp == nil || !isFollowedRedirect(resp.StatusCode) {
+		return resp, err
+	}
+
+	location := resp.Header.Get("Location")
+	if location == "" {
+		return resp, nil
+	}
+	target, parseErr := req.URL.Parse(location)
+	if parseErr != nil {
+		if resp.Body != nil {
+			_ = resp.Body.Close()
+		}
+		return nil, errs.NewInternalError(
+			errs.SubtypeInvalidResponse,
+			"platform request returned an invalid redirect location: %v",
+			parseErr,
+		).WithCause(parseErr)
+	}
+	if sameOrigin(req.URL, target) {
+		return resp, nil
+	}
+
+	if resp.Body != nil {
+		_ = resp.Body.Close()
+	}
+	return nil, errs.NewSecurityPolicyError(
+		errs.SubtypeAccessDenied,
+		"platform bootstrap blocked cross-origin redirect from %q to %q",
+		originName(req.URL),
+		originName(target),
+	)
+}
+
+// sdkBootstrapRedirectPolicy preserves the prior hook and marks each redirect hop.
+func sdkBootstrapRedirectPolicy(
+	match requestMatcher,
+	previous func(*http.Request, []*http.Request) error,
+) func(*http.Request, []*http.Request) error {
+	return func(req *http.Request, via []*http.Request) error {
+		if previous != nil {
+			if err := previous(req, via); err != nil {
+				return err
+			}
+		} else if len(via) >= 10 {
+			// Retain net/http's default redirect limit.
+			return errs.NewNetworkError(
+				errs.SubtypeNetworkTransport,
+				"stopped after 10 redirects",
+			)
+		}
+
+		if req == nil || len(via) == 0 || match == nil || !match(via[0]) {
+			return nil
+		}
+
+		ctx := context.WithValue(req.Context(), sdkBootstrapRedirectContextKey{}, struct{}{})
+		*req = *req.WithContext(ctx)
+		return nil
+	}
+}
+
+func originName(candidate *url.URL) string {
+	if candidate == nil {
+		return ""
+	}
+	return strings.ToLower(candidate.Scheme) + "://" + candidate.Host
+}
+
+func sameOrigin(left, right *url.URL) bool {
+	if left == nil || right == nil {
+		return false
+	}
+	return strings.EqualFold(left.Scheme, right.Scheme) &&
+		strings.EqualFold(left.Hostname(), right.Hostname()) &&
+		originPort(left) == originPort(right)
+}
+
+func originPort(candidate *url.URL) string {
+	if port := candidate.Port(); port != "" {
+		return port
+	}
+	switch strings.ToLower(candidate.Scheme) {
+	case "http":
+		return "80"
+	case "https":
+		return "443"
+	default:
+		return ""
+	}
+}
+
+func isFollowedRedirect(status int) bool {
+	switch status {
+	case http.StatusMovedPermanently,
+		http.StatusFound,
+		http.StatusSeeOther,
+		http.StatusTemporaryRedirect,
+		http.StatusPermanentRedirect:
+		return true
+	default:
+		return false
+	}
+}
+
+// InstallSDKTransportBridge wraps larkws's captured HTTP bootstrap client. All
+// requests through that client hit the bridge, but only matched bootstrap
+// traffic uses platform policy. The SDK owns the subsequent WebSocket dial,
+// which does not use this net/http transport.
+func InstallSDKTransportBridge(buildPlatformPolicy func(http.RoundTripper) http.RoundTripper) {
+	installDefaultClientMu.Lock()
+	defer installDefaultClientMu.Unlock()
+	installSDKTransportBridge(
+		sdkBootstrapHTTPClient,
+		isSDKWebSocketBootstrapRequest,
+		buildPlatformPolicy,
+	)
+}
+
+func isSDKWebSocketBootstrapRequest(req *http.Request) bool {
+	return req != nil &&
+		req.Method == http.MethodPost &&
+		core.IsPlatformEndpointURL(req.URL) &&
+		req.URL.Path == larkws.GenEndpointUri
+}
+
+func installSDKTransportBridge(
+	client *http.Client,
+	match requestMatcher,
+	buildPlatformPolicy transportPolicyBuilder,
+) {
+	if client == nil {
+		return
+	}
+	if existing, ok := client.Transport.(*sdkBootstrapTransport); ok {
+		existing.setPlatformPolicyBuilder(buildPlatformPolicy)
+		return
+	}
+	base := client.Transport
+	previousRedirect := client.CheckRedirect
+	client.Transport = &sdkBootstrapTransport{
+		base:                base,
+		match:               match,
+		buildPlatformPolicy: buildPlatformPolicy,
+	}
+	client.CheckRedirect = sdkBootstrapRedirectPolicy(match, previousRedirect)
+}

internal/transport/extension.go

@@ -0,0 +1,120 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package transport
+
+import (
+	"context"
+	"net/http"
+
+	exttransport "github.com/larksuite/cli/extension/transport"
+)
+
+var _ RoundTripperDecorator = (*ExtensionMiddleware)(nil)
+
+type resolvedExtension struct {
+	provider    exttransport.Provider
+	interceptor exttransport.Interceptor
+}
+
+func resolveExtension() *resolvedExtension {
+	p := exttransport.GetProvider()
+	if p == nil {
+		return nil
+	}
+	interceptor := p.ResolveInterceptor(context.Background())
+	if interceptor == nil {
+		return nil
+	}
+	return &resolvedExtension{provider: p, interceptor: interceptor}
+}
+
+func (e *resolvedExtension) wrap(base http.RoundTripper, class exttransport.RequestClass, enforceScope bool) http.RoundTripper {
+	if base == nil {
+		base = Shared()
+	}
+	if e == nil {
+		return base
+	}
+	if enforceScope {
+		if scoped, ok := e.provider.(exttransport.ScopedProvider); ok && !scoped.SupportsRequestClass(class) {
+			return base
+		}
+	}
+	return &ExtensionMiddleware{Base: base, Ext: e.interceptor, ExtName: e.provider.Name()}
+}
+
+// ExtensionMiddleware wraps the built-in transport chain with extension
+// pre/post hooks. The built-in chain always executes unless an
+// exttransport.AbortableInterceptor rejects the request.
+//
+// The original request context is restored after the pre hook to prevent an
+// extension from replacing cancellation, deadlines, or built-in values. The
+// request is cloned so URL and header mutations do not alter the caller's
+// request object. The body remains shared; interceptors that consume it must
+// restore it before returning.
+type ExtensionMiddleware struct {
+	Base    http.RoundTripper
+	Ext     exttransport.Interceptor
+	ExtName string
+}
+
+// BaseRoundTripper returns the wrapped built-in transport chain.
+func (m *ExtensionMiddleware) BaseRoundTripper() http.RoundTripper {
+	if m.Base == nil {
+		return Shared()
+	}
+	return m.Base
+}
+
+// WithBaseRoundTripper clones the middleware over base.
+func (m *ExtensionMiddleware) WithBaseRoundTripper(base http.RoundTripper) http.RoundTripper {
+	cloned := *m
+	cloned.Base = base
+	return &cloned
+}
+
+// RoundTrip invokes the extension pre hook, the wrapped transport, and then
+// the optional post hook. Abortable interceptors can stop the request before
+// the wrapped transport is called.
+func (m *ExtensionMiddleware) RoundTrip(req *http.Request) (*http.Response, error) {
+	origCtx := req.Context()
+	req = req.Clone(origCtx)
+
+	var (
+		post     func(*http.Response, error)
+		abortErr error
+	)
+	if a, ok := m.Ext.(exttransport.AbortableInterceptor); ok {
+		post, abortErr = a.PreRoundTripE(req)
+	} else {
+		post = m.Ext.PreRoundTrip(req)
+	}
+	if abortErr != nil {
+		if post != nil {
+			post(nil, abortErr)
+		}
+		return nil, &exttransport.AbortError{Extension: m.ExtName, Reason: abortErr}
+	}
+
+	req = req.WithContext(origCtx)
+	resp, err := m.BaseRoundTripper().RoundTrip(req)
+	if post != nil {
+		post(resp, err)
+	}
+	return resp, err
+}
+
+// WrapWithExtension wraps base with the currently registered transport
+// extension. With no registered provider or no resolved interceptor, base is
+// returned unchanged.
+func WrapWithExtension(base http.RoundTripper) http.RoundTripper {
+	return resolveExtension().wrap(base, "", false)
+}
+
+// WrapWithExtensionForClass wraps base only when the registered provider
+// supports class. Providers without the optional ScopedProvider interface keep
+// their historical all-request behavior.
+func WrapWithExtensionForClass(base http.RoundTripper, class exttransport.RequestClass) http.RoundTripper {
+	return resolveExtension().wrap(base, class, true)
+}

internal/transport/extension_test.go

@@ -0,0 +1,924 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package transport
+
+import (
+	"context"
+	"errors"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strconv"
+	"strings"
+	"sync/atomic"
+	"testing"
+
+	larkws "github.com/larksuite/oapi-sdk-go/v3/ws"
+
+	"github.com/larksuite/cli/errs"
+	exttransport "github.com/larksuite/cli/extension/transport"
+)
+
+type testProvider struct {
+	interceptor  exttransport.Interceptor
+	resolveCalls *int
+}
+
+func (p testProvider) Name() string { return "test-provider" }
+
+func (p testProvider) ResolveInterceptor(context.Context) exttransport.Interceptor {
+	if p.resolveCalls != nil {
+		*p.resolveCalls++
+	}
+	return p.interceptor
+}
+
+type scopedTestProvider struct {
+	testProvider
+	supported exttransport.RequestClass
+}
+
+func (p scopedTestProvider) SupportsRequestClass(class exttransport.RequestClass) bool {
+	return class == p.supported
+}
+
+type testHeaderInterceptor struct {
+	calls int
+}
+
+func (i *testHeaderInterceptor) PreRoundTrip(req *http.Request) func(*http.Response, error) {
+	i.calls++
+	req.Header.Set("X-Test-Platform", "routed")
+	return nil
+}
+
+type abortingTestInterceptor struct {
+	reason error
+	post   func(*http.Response, error)
+}
+
+func (i *abortingTestInterceptor) PreRoundTrip(*http.Request) func(*http.Response, error) {
+	panic("PreRoundTrip called for abortable interceptor")
+}
+
+func (i *abortingTestInterceptor) PreRoundTripE(*http.Request) (func(*http.Response, error), error) {
+	return i.post, i.reason
+}
+
+func TestLegacyProviderKeepsAllRequestBehavior(t *testing.T) {
+	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
+	unsetProxyPluginEnv(t)
+	resetProxyPluginState()
+	t.Setenv(EnvNoProxy, "")
+
+	interceptor := &testHeaderInterceptor{}
+	previousProvider := exttransport.GetProvider()
+	exttransport.Register(testProvider{interceptor: interceptor})
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+
+	received := make(chan string, 2)
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		received <- req.Header.Get("X-Test-Platform")
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(server.Close)
+
+	for _, client := range []*http.Client{
+		ClientForRequestClass(NewHTTPClient(0), exttransport.RequestClassPlatform),
+		NewExternalHTTPClient(0),
+	} {
+		resp, err := client.Get(server.URL)
+		if err != nil {
+			t.Fatal(err)
+		}
+		resp.Body.Close()
+	}
+
+	if got := <-received; got != "routed" {
+		t.Fatalf("platform request header = %q, want routed", got)
+	}
+	if got := <-received; got != "routed" {
+		t.Fatalf("external request header = %q, want routed for legacy provider", got)
+	}
+	if interceptor.calls != 2 {
+		t.Fatalf("extension calls = %d, want exactly 2", interceptor.calls)
+	}
+}
+
+func TestScopedProviderOnlyRunsForSupportedRequestClass(t *testing.T) {
+	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
+	unsetProxyPluginEnv(t)
+	resetProxyPluginState()
+	t.Setenv(EnvNoProxy, "")
+
+	interceptor := &testHeaderInterceptor{}
+	previousProvider := exttransport.GetProvider()
+	exttransport.Register(scopedTestProvider{
+		testProvider: testProvider{interceptor: interceptor},
+		supported:    exttransport.RequestClassPlatform,
+	})
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+
+	received := make(chan string, 2)
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		received <- req.Header.Get("X-Test-Platform")
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(server.Close)
+
+	clients := []*http.Client{
+		ClientForRequestClass(NewHTTPClient(0), exttransport.RequestClassPlatform),
+		NewExternalHTTPClient(0),
+	}
+	for _, client := range clients {
+		resp, err := client.Get(server.URL)
+		if err != nil {
+			t.Fatal(err)
+		}
+		resp.Body.Close()
+	}
+
+	if got := <-received; got != "routed" {
+		t.Fatalf("platform request header = %q, want routed", got)
+	}
+	if got := <-received; got != "" {
+		t.Fatalf("external request received scoped provider header %q", got)
+	}
+	if interceptor.calls != 1 {
+		t.Fatalf("extension calls = %d, want exactly 1", interceptor.calls)
+	}
+}
+
+func TestHTTPPolicyRouterResolvesProviderOnce(t *testing.T) {
+	resolveCalls := 0
+	previousProvider := exttransport.GetProvider()
+	exttransport.Register(testProvider{
+		interceptor:  &testHeaderInterceptor{},
+		resolveCalls: &resolveCalls,
+	})
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+
+	base := roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+	})
+	_ = NewHTTPPolicyRouter(base, base)
+
+	if resolveCalls != 1 {
+		t.Fatalf("ResolveInterceptor() calls = %d, want 1 per router", resolveCalls)
+	}
+}
+
+func TestSDKBootstrapBridgeBlocksCrossOriginRedirectAfterSameOriginHop(t *testing.T) {
+	var externalCalls atomic.Int32
+	var relayBody string
+	base := roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		if req.URL.Host == "external.example" {
+			externalCalls.Add(1)
+			return noContentResponse(req), nil
+		}
+		switch req.URL.Path {
+		case "/bootstrap":
+			return redirectResponse(req, http.StatusTemporaryRedirect, "/relay"), nil
+		case "/relay":
+			body, err := io.ReadAll(req.Body)
+			if err != nil {
+				return nil, err
+			}
+			relayBody = string(body)
+			return redirectResponse(
+				req,
+				http.StatusPermanentRedirect,
+				"https://external.example/target",
+			), nil
+		default:
+			return noContentResponse(req), nil
+		}
+	})
+
+	client := &http.Client{Transport: base}
+	installSDKTransportBridge(client, func(req *http.Request) bool {
+		return req.URL != nil && req.URL.Path == "/bootstrap"
+	}, identityTransportPolicy)
+
+	const secret = "app_secret=secret"
+	req, err := http.NewRequest(
+		http.MethodPost,
+		"https://platform.example/bootstrap",
+		strings.NewReader(secret),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := client.Do(req)
+	if resp != nil && resp.Body != nil {
+		resp.Body.Close()
+	}
+	if err == nil || !strings.Contains(err.Error(), "cross-origin redirect") {
+		t.Fatalf("Do() error = %v, want cross-origin redirect rejection", err)
+	}
+	if problem, ok := errs.ProblemOf(err); !ok ||
+		problem.Category != errs.CategoryPolicy ||
+		problem.Subtype != errs.SubtypeAccessDenied {
+		t.Fatalf("Do() problem = %#v, %v; want policy/access_denied", problem, ok)
+	}
+	if relayBody != secret {
+		t.Fatalf("same-origin relay body = %q, want %q", relayBody, secret)
+	}
+	if got := externalCalls.Load(); got != 0 {
+		t.Fatalf("cross-origin target calls = %d, want 0", got)
+	}
+}
+
+func TestSDKBootstrapRedirectGuardClassifiesInvalidLocation(t *testing.T) {
+	base := roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		return redirectResponse(req, http.StatusFound, "%"), nil
+	})
+	client := &http.Client{Transport: &sameOriginRedirectTransport{base: base}}
+	resp, err := client.Get("https://platform.example/bootstrap")
+	if resp != nil && resp.Body != nil {
+		resp.Body.Close()
+	}
+	if err == nil || !strings.Contains(err.Error(), "invalid redirect location") {
+		t.Fatalf("Do() error = %v, want invalid redirect rejection", err)
+	}
+	problem, ok := errs.ProblemOf(err)
+	if !ok || problem.Category != errs.CategoryInternal || problem.Subtype != errs.SubtypeInvalidResponse {
+		t.Fatalf("Do() problem = %#v, %v; want internal/invalid_response", problem, ok)
+	}
+}
+
+type redirectPolicyInterceptor struct {
+	calls int
+}
+
+func (i *redirectPolicyInterceptor) PreRoundTrip(req *http.Request) func(*http.Response, error) {
+	i.calls++
+	req.Header.Set("X-Extension-Hop", strconv.Itoa(i.calls))
+	req.Header.Set("X-Reserved", "extension")
+	return nil
+}
+
+func TestSDKBootstrapBridgeRetainsPoliciesAcrossSameOriginRedirect(t *testing.T) {
+	previousProvider := exttransport.GetProvider()
+	interceptor := &redirectPolicyInterceptor{}
+	exttransport.Register(scopedTestProvider{
+		testProvider: testProvider{interceptor: interceptor},
+		supported:    exttransport.RequestClassPlatform,
+	})
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+
+	var finalHeaders http.Header
+	base := roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		switch req.URL.Path {
+		case "/bootstrap":
+			return redirectResponse(req, http.StatusTemporaryRedirect, "/next"), nil
+		case "/next":
+			finalHeaders = req.Header.Clone()
+			return noContentResponse(req), nil
+		default:
+			return noContentResponse(req), nil
+		}
+	})
+
+	builtInCalls := 0
+	client := &http.Client{Transport: base}
+	installSDKTransportBridge(
+		client,
+		func(req *http.Request) bool {
+			return req.URL != nil && req.URL.Path == "/bootstrap"
+		},
+		func(base http.RoundTripper) http.RoundTripper {
+			return roundTripFunc(func(req *http.Request) (*http.Response, error) {
+				builtInCalls++
+				req = req.Clone(req.Context())
+				req.Header.Set("X-Builtin-Hop", strconv.Itoa(builtInCalls))
+				req.Header.Set("X-Reserved", "trusted")
+				return base.RoundTrip(req)
+			})
+		},
+	)
+
+	req, err := http.NewRequest(
+		http.MethodPost,
+		"https://platform.example/bootstrap",
+		strings.NewReader("body"),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+
+	if finalHeaders == nil {
+		t.Fatal("same-origin redirect target was not called")
+	}
+	if interceptor.calls != 2 {
+		t.Fatalf("extension calls = %d, want 2", interceptor.calls)
+	}
+	if builtInCalls != 2 {
+		t.Fatalf("built-in policy calls = %d, want 2", builtInCalls)
+	}
+	if got := finalHeaders.Get("X-Extension-Hop"); got != "2" {
+		t.Fatalf("final X-Extension-Hop = %q, want 2", got)
+	}
+	if got := finalHeaders.Get("X-Builtin-Hop"); got != "2" {
+		t.Fatalf("final X-Builtin-Hop = %q, want 2", got)
+	}
+	if got := finalHeaders.Get("X-Reserved"); got != "trusted" {
+		t.Fatalf("final X-Reserved = %q, want trusted built-in value", got)
+	}
+}
+
+type redirectRewriteInterceptor struct {
+	target       *url.URL
+	postLocation string
+	calls        int
+}
+
+func (i *redirectRewriteInterceptor) PreRoundTrip(req *http.Request) func(*http.Response, error) {
+	i.calls++
+	req.URL.Scheme = i.target.Scheme
+	req.URL.Host = i.target.Host
+	if i.postLocation == "" {
+		return nil
+	}
+	return func(resp *http.Response, err error) {
+		if err == nil && resp != nil && isFollowedRedirect(resp.StatusCode) {
+			resp.Header.Set("Location", i.postLocation)
+		}
+	}
+}
+
+func TestSDKBootstrapRedirectGuardUsesLogicalURLAfterExtensionRewrite(t *testing.T) {
+	sidecarURL, err := url.Parse("https://sidecar.example")
+	if err != nil {
+		t.Fatal(err)
+	}
+	sidecarCalls := 0
+	base := roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		if req.URL.Host != sidecarURL.Host {
+			t.Fatalf("network host = %q, want extension target %q", req.URL.Host, sidecarURL.Host)
+		}
+		sidecarCalls++
+		switch req.URL.Path {
+		case "/bootstrap":
+			return redirectResponse(
+				req,
+				http.StatusTemporaryRedirect,
+				"https://platform.example/next",
+			), nil
+		case "/next":
+			return noContentResponse(req), nil
+		default:
+			return noContentResponse(req), nil
+		}
+	})
+
+	previousProvider := exttransport.GetProvider()
+	interceptor := &redirectRewriteInterceptor{target: sidecarURL}
+	exttransport.Register(scopedTestProvider{
+		testProvider: testProvider{interceptor: interceptor},
+		supported:    exttransport.RequestClassPlatform,
+	})
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+
+	client := &http.Client{Transport: base}
+	installSDKTransportBridge(client, func(req *http.Request) bool {
+		return req.URL != nil && req.URL.Path == "/bootstrap"
+	}, identityTransportPolicy)
+
+	req, err := http.NewRequest(
+		http.MethodPost,
+		"https://platform.example/bootstrap",
+		strings.NewReader("body"),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+
+	if sidecarCalls != 2 {
+		t.Fatalf("sidecar calls = %d, want 2", sidecarCalls)
+	}
+	if interceptor.calls != 2 {
+		t.Fatalf("extension calls = %d, want 2", interceptor.calls)
+	}
+}
+
+func TestSDKBootstrapRedirectGuardChecksLocationAfterExtensionPostHook(t *testing.T) {
+	var externalCalls atomic.Int32
+	sidecarURL, err := url.Parse("https://sidecar.example")
+	if err != nil {
+		t.Fatal(err)
+	}
+	base := roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		if req.URL.Host == "external.example" {
+			externalCalls.Add(1)
+			return noContentResponse(req), nil
+		}
+		return redirectResponse(
+			req,
+			http.StatusTemporaryRedirect,
+			"https://platform.example/next",
+		), nil
+	})
+
+	previousProvider := exttransport.GetProvider()
+	exttransport.Register(scopedTestProvider{
+		testProvider: testProvider{interceptor: &redirectRewriteInterceptor{
+			target:       sidecarURL,
+			postLocation: "https://external.example/target",
+		}},
+		supported: exttransport.RequestClassPlatform,
+	})
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+
+	client := &http.Client{Transport: base}
+	installSDKTransportBridge(client, func(req *http.Request) bool {
+		return req.URL != nil && req.URL.Path == "/bootstrap"
+	}, identityTransportPolicy)
+	req, err := http.NewRequest(
+		http.MethodPost,
+		"https://platform.example/bootstrap",
+		strings.NewReader("secret"),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := client.Do(req)
+	if resp != nil && resp.Body != nil {
+		resp.Body.Close()
+	}
+	if err == nil || !strings.Contains(err.Error(), "cross-origin redirect") {
+		t.Fatalf("Do() error = %v, want post-hook Location rejection", err)
+	}
+	if problem, ok := errs.ProblemOf(err); !ok ||
+		problem.Category != errs.CategoryPolicy ||
+		problem.Subtype != errs.SubtypeAccessDenied {
+		t.Fatalf("Do() problem = %#v, %v; want policy/access_denied", problem, ok)
+	}
+	if got := externalCalls.Load(); got != 0 {
+		t.Fatalf("post-hook redirect target calls = %d, want 0", got)
+	}
+}
+
+func TestSameOriginNormalizesDefaultPort(t *testing.T) {
+	left, err := url.Parse("https://platform.example/bootstrap")
+	if err != nil {
+		t.Fatal(err)
+	}
+	right, err := url.Parse("https://platform.example:443/next")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !sameOrigin(left, right) {
+		t.Fatal("sameOrigin() = false for equivalent default HTTPS ports")
+	}
+}
+
+func TestDefaultClientBridgeCoversWebSocketSDKBootstrap(t *testing.T) {
+	preserveHTTPClientState(t, sdkBootstrapHTTPClient)
+	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
+	unsetProxyPluginEnv(t)
+	resetProxyPluginState()
+	t.Setenv(EnvNoProxy, "1")
+
+	previousProvider := exttransport.GetProvider()
+	interceptor := &testHeaderInterceptor{}
+	exttransport.Register(scopedTestProvider{
+		testProvider: testProvider{interceptor: interceptor},
+		supported:    exttransport.RequestClassPlatform,
+	})
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+
+	seenHeader := make(chan string, 1)
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		seenHeader <- req.Header.Get("X-Test-Platform")
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusBadRequest)
+		_, _ = io.WriteString(w, `{"code":400,"msg":"stop after bootstrap"}`)
+	}))
+	t.Cleanup(server.Close)
+
+	installSDKTransportBridge(sdkBootstrapHTTPClient, func(req *http.Request) bool {
+		return req.URL != nil && req.URL.Host == strings.TrimPrefix(server.URL, "http://")
+	}, identityTransportPolicy)
+
+	client := larkws.NewClient(
+		"test-app",
+		"test-secret",
+		larkws.WithDomain(server.URL),
+		larkws.WithAutoReconnect(false),
+	)
+	if err := client.Start(context.Background()); err == nil {
+		t.Fatal("WebSocket SDK Start() error = nil, want bootstrap failure")
+	}
+	if got := <-seenHeader; got != "routed" {
+		t.Fatalf("WebSocket bootstrap header = %q, want routed", got)
+	}
+	if interceptor.calls != 1 {
+		t.Fatalf("extension calls = %d, want exactly 1 bootstrap call", interceptor.calls)
+	}
+}
+
+func TestSDKTransportBridgeUsesPinnedClientAfterGlobalReplacement(t *testing.T) {
+	preserveHTTPClientState(t, sdkBootstrapHTTPClient)
+	oldDefaultClient := http.DefaultClient
+	t.Cleanup(func() { http.DefaultClient = oldDefaultClient })
+
+	var pinnedCalls atomic.Int32
+	pinnedHeader := make(chan string, 1)
+	sdkBootstrapHTTPClient.Transport = roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		pinnedCalls.Add(1)
+		pinnedHeader <- req.Header.Get("X-Pinned-Bridge")
+		return &http.Response{
+			StatusCode: http.StatusBadRequest,
+			Header:     http.Header{"Content-Type": []string{"application/json"}},
+			Body:       io.NopCloser(strings.NewReader(`{"code":400,"msg":"stop"}`)),
+			Request:    req,
+		}, nil
+	})
+	sdkBootstrapHTTPClient.CheckRedirect = nil
+
+	var replacementCalls atomic.Int32
+	http.DefaultClient = &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		replacementCalls.Add(1)
+		return &http.Response{
+			StatusCode: http.StatusBadRequest,
+			Body:       http.NoBody,
+			Request:    req,
+		}, nil
+	})}
+
+	InstallSDKTransportBridge(func(base http.RoundTripper) http.RoundTripper {
+		return roundTripFunc(func(req *http.Request) (*http.Response, error) {
+			req = req.Clone(req.Context())
+			req.Header.Set("X-Pinned-Bridge", "routed")
+			return base.RoundTrip(req)
+		})
+	})
+
+	client := larkws.NewClient(
+		"test-app",
+		"test-secret",
+		larkws.WithAutoReconnect(false),
+	)
+	if err := client.Start(context.Background()); err == nil {
+		t.Fatal("WebSocket SDK Start() error = nil, want bootstrap failure")
+	}
+	if got := pinnedCalls.Load(); got != 1 {
+		t.Fatalf("SDK-pinned client calls = %d, want 1", got)
+	}
+	if got := <-pinnedHeader; got != "routed" {
+		t.Fatalf("SDK-pinned bridge header = %q, want routed", got)
+	}
+	if got := replacementCalls.Load(); got != 0 {
+		t.Fatalf("replacement DefaultClient calls = %d, want 0", got)
+	}
+}
+
+func TestSDKWebSocketBootstrapMatcherIsNarrow(t *testing.T) {
+	tests := []struct {
+		name   string
+		method string
+		url    string
+		want   bool
+	}{
+		{
+			name:   "platform bootstrap",
+			method: http.MethodPost,
+			url:    "https://open.feishu.cn/callback/ws/endpoint",
+			want:   true,
+		},
+		{
+			name:   "other platform path",
+			method: http.MethodPost,
+			url:    "https://open.feishu.cn/open-apis/test",
+		},
+		{
+			name:   "wrong bootstrap method",
+			method: http.MethodGet,
+			url:    "https://open.feishu.cn/callback/ws/endpoint",
+		},
+		{
+			name:   "external lookalike",
+			method: http.MethodPost,
+			url:    "https://external.example/callback/ws/endpoint",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			req, err := http.NewRequest(tt.method, tt.url, nil)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if got := isSDKWebSocketBootstrapRequest(req); got != tt.want {
+				t.Fatalf("isSDKWebSocketBootstrapRequest() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestSDKTransportBridgeLeavesOtherPlatformPathsUntouched(t *testing.T) {
+	previousProvider := exttransport.GetProvider()
+	interceptor := &testHeaderInterceptor{}
+	exttransport.Register(scopedTestProvider{
+		testProvider: testProvider{interceptor: interceptor},
+		supported:    exttransport.RequestClassPlatform,
+	})
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+
+	baseCalls := 0
+	client := &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		baseCalls++
+		return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+	})}
+	installSDKTransportBridge(client, isSDKWebSocketBootstrapRequest, nil)
+
+	req, err := http.NewRequest(http.MethodGet, "https://open.feishu.cn/open-apis/test", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+
+	if baseCalls != 1 {
+		t.Fatalf("base calls = %d, want 1", baseCalls)
+	}
+	if interceptor.calls != 0 {
+		t.Fatalf("extension calls = %d, want 0 for unmatched DefaultClient traffic", interceptor.calls)
+	}
+}
+
+func TestSDKTransportBridgeNilBasePreservesDefaultTransportForUnmatchedRequest(t *testing.T) {
+	oldDefaultTransport := http.DefaultTransport
+	t.Cleanup(func() { http.DefaultTransport = oldDefaultTransport })
+
+	unsetProxyPluginEnv(t)
+	resetProxyPluginState()
+	t.Setenv(EnvNoProxy, "1")
+
+	var firstCalls atomic.Int32
+	http.DefaultTransport = roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		firstCalls.Add(1)
+		return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+	})
+	client := &http.Client{}
+	installSDKTransportBridge(client, func(*http.Request) bool { return false }, nil)
+
+	var currentCalls atomic.Int32
+	http.DefaultTransport = roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		currentCalls.Add(1)
+		return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+	})
+
+	req, err := http.NewRequest(http.MethodGet, "http://127.0.0.1:1/unmatched", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+
+	if got := firstCalls.Load(); got != 0 {
+		t.Fatalf("install-time DefaultTransport calls = %d, want 0", got)
+	}
+	if got := currentCalls.Load(); got != 1 {
+		t.Fatalf("request-time DefaultTransport calls = %d, want 1", got)
+	}
+}
+
+func TestSDKTransportBridgeUpdatesPlatformPolicy(t *testing.T) {
+	client := &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		return noContentResponse(req), nil
+	})}
+	var firstCalls, secondCalls int
+	build := func(calls *int) transportPolicyBuilder {
+		return func(base http.RoundTripper) http.RoundTripper {
+			*calls++
+			return base
+		}
+	}
+	match := func(*http.Request) bool { return true }
+	installSDKTransportBridge(client, match, build(&firstCalls))
+	installSDKTransportBridge(client, match, build(&secondCalls))
+	req, err := http.NewRequest(http.MethodPost, "https://platform.example/bootstrap", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+	if firstCalls != 0 || secondCalls != 1 {
+		t.Fatalf("policy calls = (%d, %d), want (0, 1)", firstCalls, secondCalls)
+	}
+}
+
+func TestSDKBootstrapTransportFailsClosedWithoutPlatformPolicy(t *testing.T) {
+	var baseCalls atomic.Int32
+	client := &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		baseCalls.Add(1)
+		return &http.Response{
+			StatusCode: http.StatusNoContent,
+			Body:       http.NoBody,
+			Request:    req,
+		}, nil
+	})}
+	installSDKTransportBridge(client, func(*http.Request) bool { return true }, nil)
+
+	req, err := http.NewRequest(http.MethodPost, "https://platform.example/bootstrap", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := client.Do(req)
+	if resp != nil && resp.Body != nil {
+		resp.Body.Close()
+	}
+	if err == nil || !strings.Contains(err.Error(), "policy is not configured") {
+		t.Fatalf("Do() error = %v, want missing policy rejection", err)
+	}
+	if problem, ok := errs.ProblemOf(err); !ok ||
+		problem.Category != errs.CategoryInternal ||
+		problem.Subtype != errs.SubtypeUnknown {
+		t.Fatalf("Do() problem = %#v, %v; want internal/unknown", problem, ok)
+	}
+	if got := baseCalls.Load(); got != 0 {
+		t.Fatalf("base transport calls = %d, want 0", got)
+	}
+}
+
+func TestSDKBootstrapTransportFailsClosedForNilPlatformTransport(t *testing.T) {
+	var baseCalls atomic.Int32
+	client := &http.Client{Transport: roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		baseCalls.Add(1)
+		return &http.Response{
+			StatusCode: http.StatusNoContent,
+			Body:       http.NoBody,
+			Request:    req,
+		}, nil
+	})}
+	installSDKTransportBridge(client, func(*http.Request) bool { return true }, func(http.RoundTripper) http.RoundTripper {
+		return nil
+	})
+
+	req, err := http.NewRequest(http.MethodPost, "https://platform.example/bootstrap", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := client.Do(req)
+	if resp != nil && resp.Body != nil {
+		resp.Body.Close()
+	}
+	if err == nil || !strings.Contains(err.Error(), "nil transport") {
+		t.Fatalf("Do() error = %v, want nil policy transport rejection", err)
+	}
+	if problem, ok := errs.ProblemOf(err); !ok ||
+		problem.Category != errs.CategoryInternal ||
+		problem.Subtype != errs.SubtypeUnknown {
+		t.Fatalf("Do() problem = %#v, %v; want internal/unknown", problem, ok)
+	}
+	if got := baseCalls.Load(); got != 0 {
+		t.Fatalf("base transport calls = %d, want 0", got)
+	}
+}
+
+func TestSDKBootstrapRedirectPolicyRetainsDefaultLimit(t *testing.T) {
+	policy := sdkBootstrapRedirectPolicy(nil, nil)
+	via := make([]*http.Request, 10)
+	err := policy(&http.Request{}, via)
+	if err == nil {
+		t.Fatal("redirect policy error = nil after 10 redirects")
+	}
+	if problem, ok := errs.ProblemOf(err); !ok ||
+		problem.Category != errs.CategoryNetwork ||
+		problem.Subtype != errs.SubtypeNetworkTransport {
+		t.Fatalf("redirect problem = %#v, %v; want network/transport", problem, ok)
+	}
+}
+
+func TestExtensionMiddlewareUsesFallbackWhenBaseIsNil(t *testing.T) {
+	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
+	unsetProxyPluginEnv(t)
+	resetProxyPluginState()
+	t.Setenv(EnvNoProxy, "")
+
+	previous := http.DefaultTransport
+	var calls atomic.Int32
+	http.DefaultTransport = roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		calls.Add(1)
+		return &http.Response{
+			StatusCode: http.StatusNoContent,
+			Body:       http.NoBody,
+			Request:    req,
+		}, nil
+	})
+	t.Cleanup(func() { http.DefaultTransport = previous })
+
+	req, err := http.NewRequest(http.MethodGet, "https://external.example/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := (&ExtensionMiddleware{Ext: &testHeaderInterceptor{}}).RoundTrip(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+	if got := calls.Load(); got != 1 {
+		t.Fatalf("fallback transport calls = %d, want 1", got)
+	}
+}
+
+func TestExtensionMiddlewareAbortsBeforeBase(t *testing.T) {
+	reason := errors.New("blocked")
+	baseCalled := false
+	postCalled := false
+	interceptor := &abortingTestInterceptor{
+		reason: reason,
+		post: func(resp *http.Response, err error) {
+			postCalled = true
+			if resp != nil || err != reason {
+				t.Errorf("post arguments = (%v, %v), want (nil, reason)", resp, err)
+			}
+		},
+	}
+	middleware := &ExtensionMiddleware{
+		Base: roundTripFunc(func(*http.Request) (*http.Response, error) {
+			baseCalled = true
+			return nil, nil
+		}),
+		Ext:     interceptor,
+		ExtName: "test-provider",
+	}
+
+	resp, err := middleware.RoundTrip(httptest.NewRequest(http.MethodGet, "https://example.com", nil))
+	if resp != nil {
+		t.Fatalf("response = %v, want nil", resp)
+	}
+	var abortErr *exttransport.AbortError
+	if !errors.As(err, &abortErr) {
+		t.Fatalf("error = %T, want *transport.AbortError", err)
+	}
+	if abortErr.Extension != "test-provider" || abortErr.Reason != reason {
+		t.Fatalf("abort error = %#v, want provider and reason", abortErr)
+	}
+	if baseCalled {
+		t.Fatal("base transport was called")
+	}
+	if !postCalled {
+		t.Fatal("post hook was not called")
+	}
+}
+
+func preserveHTTPClientState(t *testing.T, client *http.Client) {
+	t.Helper()
+	oldTransport := client.Transport
+	oldCheckRedirect := client.CheckRedirect
+	t.Cleanup(func() {
+		client.Transport = oldTransport
+		client.CheckRedirect = oldCheckRedirect
+	})
+}
+
+func identityTransportPolicy(base http.RoundTripper) http.RoundTripper {
+	return base
+}
+
+func redirectResponse(req *http.Request, status int, location string) *http.Response {
+	return &http.Response{
+		StatusCode: status,
+		Header:     http.Header{"Location": []string{location}},
+		Body:       http.NoBody,
+		Request:    req,
+	}
+}
+
+func noContentResponse(req *http.Request) *http.Response {
+	return &http.Response{
+		StatusCode: http.StatusNoContent,
+		Body:       http.NoBody,
+		Request:    req,
+	}
+}
+
+type roundTripFunc func(*http.Request) (*http.Response, error)
+
+func (f roundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
+	return f(req)
+}

internal/transport/policy_router.go

@@ -0,0 +1,232 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package transport
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/larksuite/cli/errs"
+	exttransport "github.com/larksuite/cli/extension/transport"
+	"github.com/larksuite/cli/internal/core"
+)
+
+type requestClassContextKey struct{}
+type forcedRequestClassContextKey struct{}
+
+// HTTPPolicyRouter selects an HTTP transport policy from request intent and
+// the endpoint catalog. Explicit request intent takes precedence; otherwise
+// known platform endpoints use the platform policy and all other URLs use the
+// external policy.
+type HTTPPolicyRouter struct {
+	platform http.RoundTripper
+	external http.RoundTripper
+}
+
+// RoundTripperDecorator describes a transport layer that can be rebuilt over
+// a cloned base transport. Connection-policy helpers use this contract to
+// preserve retry, response, and extension layers while safely customizing the
+// innermost *http.Transport.
+type RoundTripperDecorator interface {
+	BaseRoundTripper() http.RoundTripper
+	WithBaseRoundTripper(http.RoundTripper) http.RoundTripper
+}
+
+// NewHTTPPolicyRouter constructs a router over two policy chains. A nil chain
+// falls back to the shared proxy-aware transport. The currently registered
+// extension provider is resolved once and applied according to its optional
+// ScopedProvider contract.
+func NewHTTPPolicyRouter(platform, external http.RoundTripper) *HTTPPolicyRouter {
+	if platform == nil {
+		platform = Shared()
+	}
+	if external == nil {
+		external = Shared()
+	}
+
+	extension := resolveExtension()
+	return &HTTPPolicyRouter{
+		platform: extension.wrap(platform, exttransport.RequestClassPlatform, true),
+		external: extension.wrap(external, exttransport.RequestClassExternal, true),
+	}
+}
+
+// RoundTrip dispatches the request to its selected policy chain.
+func (r *HTTPPolicyRouter) RoundTrip(req *http.Request) (*http.Response, error) {
+	if req == nil {
+		return nil, errs.NewInternalError(
+			errs.SubtypeUnknown,
+			"HTTP policy router received a nil request",
+		)
+	}
+	class, err := classifyRequest(req)
+	if err != nil {
+		return nil, err
+	}
+	if class == exttransport.RequestClassPlatform {
+		return r.platform.RoundTrip(req)
+	}
+	return r.external.RoundTrip(req)
+}
+
+func (r *HTTPPolicyRouter) transportForClass(class exttransport.RequestClass) (http.RoundTripper, bool) {
+	switch class {
+	case exttransport.RequestClassPlatform:
+		return r.platform, true
+	case exttransport.RequestClassExternal:
+		return r.external, true
+	default:
+		return nil, false
+	}
+}
+
+func classifyRequest(req *http.Request) (exttransport.RequestClass, error) {
+	if explicit, ok := req.Context().Value(requestClassContextKey{}).(exttransport.RequestClass); ok {
+		switch explicit {
+		case exttransport.RequestClassPlatform, exttransport.RequestClassExternal:
+			return explicit, nil
+		default:
+			return "", errs.NewInternalError(
+				errs.SubtypeUnknown,
+				"unsupported HTTP request class %q",
+				explicit,
+			)
+		}
+	}
+	if core.IsPlatformEndpointURL(req.URL) {
+		return exttransport.RequestClassPlatform, nil
+	}
+	return exttransport.RequestClassExternal, nil
+}
+
+// WithRequestClass returns a shallow copy of req with explicit routing intent.
+func WithRequestClass(req *http.Request, class exttransport.RequestClass) *http.Request {
+	if req == nil {
+		return nil
+	}
+	ctx := context.WithValue(req.Context(), requestClassContextKey{}, class)
+	return req.WithContext(ctx)
+}
+
+func withForcedRequestClass(req *http.Request, class exttransport.RequestClass) *http.Request {
+	if req == nil {
+		return nil
+	}
+	if _, forced := req.Context().Value(forcedRequestClassContextKey{}).(struct{}); forced {
+		return req
+	}
+	ctx := context.WithValue(req.Context(), requestClassContextKey{}, class)
+	ctx = context.WithValue(ctx, forcedRequestClassContextKey{}, struct{}{})
+	return req.WithContext(ctx)
+}
+
+type requestClassTransport struct {
+	base  http.RoundTripper
+	class exttransport.RequestClass
+}
+
+func (t *requestClassTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	return t.base.RoundTrip(withForcedRequestClass(req, t.class))
+}
+
+// CloneHTTPTransport exposes a structural cloning capability without requiring
+// higher-level safety helpers to import this package. The explicit request
+// class selects the policy branch that must be rebuilt.
+func (t *requestClassTransport) CloneHTTPTransport() (http.RoundTripper, *http.Transport, bool) {
+	return CloneHTTPTransportForRequestClass(t.base, t.class)
+}
+
+// TransformHTTPTransport clones the selected policy branch and replaces its
+// concrete transport in place. Keeping the replacement at the graph leaf is
+// important for policies that must observe requests after outer decorators
+// have run, such as proxy selection.
+func (t *requestClassTransport) TransformHTTPTransport(transform func(*http.Transport) (http.RoundTripper, bool)) (http.RoundTripper, bool) {
+	return transformHTTPTransportForRequestClass(t.base, t.class, transform, 0)
+}
+
+// ClientForRequestClass clones client and forces all of its requests through a
+// specific policy class. The original client is never mutated.
+func ClientForRequestClass(client *http.Client, class exttransport.RequestClass) *http.Client {
+	if client == nil {
+		client = &http.Client{}
+	}
+	cloned := *client
+	base := client.Transport
+	if base == nil {
+		base = Shared()
+	}
+	cloned.Transport = &requestClassTransport{base: base, class: class}
+	return &cloned
+}
+
+// CloneHTTPTransportForRequestClass selects one policy branch, clones its
+// innermost *http.Transport, and rebuilds every composable decorator around
+// the clone. Callers can customize concrete before using rebuilt. The original
+// transport graph is never mutated.
+func CloneHTTPTransportForRequestClass(base http.RoundTripper, class exttransport.RequestClass) (rebuilt http.RoundTripper, concrete *http.Transport, ok bool) {
+	rebuilt, ok = transformHTTPTransportForRequestClass(base, class, func(cloned *http.Transport) (http.RoundTripper, bool) {
+		concrete = cloned
+		return cloned, true
+	}, 0)
+	if !ok {
+		return nil, nil, false
+	}
+	return rebuilt, concrete, true
+}
+
+func transformHTTPTransportForRequestClass(
+	base http.RoundTripper,
+	class exttransport.RequestClass,
+	transform func(*http.Transport) (http.RoundTripper, bool),
+	depth int,
+) (http.RoundTripper, bool) {
+	if depth > 32 {
+		return nil, false
+	}
+	if base == nil || transform == nil {
+		if transform == nil {
+			return nil, false
+		}
+		base = Shared()
+	}
+
+	switch current := base.(type) {
+	case *http.Transport:
+		cloned := cloneHTTPTransport(current)
+		rebuilt, valid := transform(cloned)
+		return rebuilt, valid && rebuilt != nil
+	case *requestClassTransport:
+		return transformHTTPTransportForRequestClass(current.base, class, transform, depth+1)
+	case *HTTPPolicyRouter:
+		selected, valid := current.transportForClass(class)
+		if !valid {
+			return nil, false
+		}
+		return transformHTTPTransportForRequestClass(selected, class, transform, depth+1)
+	case RoundTripperDecorator:
+		inner := current.BaseRoundTripper()
+		if inner == nil || inner == base {
+			return nil, false
+		}
+		rebuiltInner, valid := transformHTTPTransportForRequestClass(inner, class, transform, depth+1)
+		if !valid {
+			return nil, false
+		}
+		rebuilt := current.WithBaseRoundTripper(rebuiltInner)
+		return rebuilt, rebuilt != nil
+	default:
+		return nil, false
+	}
+}
+
+func cloneHTTPTransport(source *http.Transport) *http.Transport {
+	cloned := source.Clone()
+	// Clone leaves an auto-configured h2 handler on source.
+	if cloned.TLSNextProto == nil {
+		if _, ok := source.TLSNextProto["h2"]; ok {
+			cloned.ForceAttemptHTTP2 = true
+		}
+	}
+	return cloned
+}

internal/transport/policy_router_test.go

@@ -0,0 +1,351 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package transport
+
+import (
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strings"
+	"testing"
+
+	"github.com/larksuite/cli/errs"
+	exttransport "github.com/larksuite/cli/extension/transport"
+)
+
+type cloneTestDecorator struct {
+	base http.RoundTripper
+}
+
+func (d *cloneTestDecorator) RoundTrip(req *http.Request) (*http.Response, error) {
+	return d.base.RoundTrip(req)
+}
+
+func (d *cloneTestDecorator) BaseRoundTripper() http.RoundTripper {
+	return d.base
+}
+
+func (d *cloneTestDecorator) WithBaseRoundTripper(base http.RoundTripper) http.RoundTripper {
+	return &cloneTestDecorator{base: base}
+}
+
+type headerCloneTestDecorator struct {
+	base http.RoundTripper
+}
+
+func (d *headerCloneTestDecorator) RoundTrip(req *http.Request) (*http.Response, error) {
+	req = req.Clone(req.Context())
+	req.Header.Set("X-Decorator", "applied")
+	return d.base.RoundTrip(req)
+}
+
+func (d *headerCloneTestDecorator) BaseRoundTripper() http.RoundTripper {
+	return d.base
+}
+
+func (d *headerCloneTestDecorator) WithBaseRoundTripper(base http.RoundTripper) http.RoundTripper {
+	return &headerCloneTestDecorator{base: base}
+}
+
+func TestHTTPPolicyRouterClassifiesFromEndpointCatalog(t *testing.T) {
+	exttransport.Register(nil)
+
+	platformCalls := 0
+	externalCalls := 0
+	router := NewHTTPPolicyRouter(
+		roundTripFunc(func(req *http.Request) (*http.Response, error) {
+			platformCalls++
+			return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+		}),
+		roundTripFunc(func(req *http.Request) (*http.Response, error) {
+			externalCalls++
+			return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+		}),
+	)
+
+	for _, rawURL := range []string{
+		"https://open.feishu.cn/open-apis/test",
+		"https://example.com/file",
+	} {
+		req, err := http.NewRequest(http.MethodGet, rawURL, nil)
+		if err != nil {
+			t.Fatal(err)
+		}
+		resp, err := router.RoundTrip(req)
+		if err != nil {
+			t.Fatal(err)
+		}
+		resp.Body.Close()
+	}
+
+	if platformCalls != 1 || externalCalls != 1 {
+		t.Fatalf("platform calls = %d, external calls = %d; want 1 each", platformCalls, externalCalls)
+	}
+}
+
+func TestHTTPPolicyRouterExplicitClassOverridesCatalog(t *testing.T) {
+	exttransport.Register(nil)
+
+	platformCalls := 0
+	externalCalls := 0
+	router := NewHTTPPolicyRouter(
+		roundTripFunc(func(req *http.Request) (*http.Response, error) {
+			platformCalls++
+			return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+		}),
+		roundTripFunc(func(req *http.Request) (*http.Response, error) {
+			externalCalls++
+			return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+		}),
+	)
+
+	req, err := http.NewRequest(http.MethodGet, "https://open.feishu.cn/open-apis/test", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	req = WithRequestClass(req, exttransport.RequestClassExternal)
+	resp, err := router.RoundTrip(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+
+	if platformCalls != 0 || externalCalls != 1 {
+		t.Fatalf("platform calls = %d, external calls = %d; want 0 and 1", platformCalls, externalCalls)
+	}
+}
+
+func TestClientForRequestClassOutermostIntentWins(t *testing.T) {
+	exttransport.Register(nil)
+	platformCalls := 0
+	externalCalls := 0
+	router := NewHTTPPolicyRouter(
+		roundTripFunc(func(req *http.Request) (*http.Response, error) {
+			platformCalls++
+			return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+		}),
+		roundTripFunc(func(req *http.Request) (*http.Response, error) {
+			externalCalls++
+			return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+		}),
+	)
+
+	platform := ClientForRequestClass(&http.Client{Transport: router}, exttransport.RequestClassPlatform)
+	external := ClientForRequestClass(platform, exttransport.RequestClassExternal)
+	resp, err := external.Get("https://open.feishu.cn/open-apis/test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+
+	if platformCalls != 0 || externalCalls != 1 {
+		t.Fatalf("platform calls = %d, external calls = %d; want outer external intent to win", platformCalls, externalCalls)
+	}
+}
+
+func TestHTTPPolicyRouterRejectsInvalidExplicitClass(t *testing.T) {
+	exttransport.Register(nil)
+	router := NewHTTPPolicyRouter(nil, nil)
+	req, err := http.NewRequest(http.MethodGet, "https://example.com", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	req = WithRequestClass(req, exttransport.RequestClass("invalid"))
+	if _, err := router.RoundTrip(req); err == nil || !strings.Contains(err.Error(), "unsupported HTTP request class") {
+		t.Fatalf("RoundTrip() error = %v, want unsupported request class", err)
+	} else if problem, ok := errs.ProblemOf(err); !ok ||
+		problem.Category != errs.CategoryInternal ||
+		problem.Subtype != errs.SubtypeUnknown {
+		t.Fatalf("RoundTrip() problem = %#v, %v; want internal/unknown", problem, ok)
+	}
+}
+
+func TestHTTPPolicyRouterRejectsNilRequest(t *testing.T) {
+	router := NewHTTPPolicyRouter(nil, nil)
+	_, err := router.RoundTrip(nil)
+	problem, ok := errs.ProblemOf(err)
+	if !ok || problem.Category != errs.CategoryInternal || problem.Subtype != errs.SubtypeUnknown {
+		t.Fatalf("RoundTrip() problem = %#v, %v; want internal/unknown", problem, ok)
+	}
+}
+
+func TestHTTPPolicyRouterReclassifiesRedirectTargets(t *testing.T) {
+	interceptor := &testHeaderInterceptor{}
+	exttransport.Register(scopedTestProvider{
+		testProvider: testProvider{interceptor: interceptor},
+		supported:    exttransport.RequestClassPlatform,
+	})
+	t.Cleanup(func() { exttransport.Register(nil) })
+
+	receivedHeader := make(chan string, 1)
+	external := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		receivedHeader <- req.Header.Get("X-Test-Platform")
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(external.Close)
+
+	router := NewHTTPPolicyRouter(
+		roundTripFunc(func(req *http.Request) (*http.Response, error) {
+			return &http.Response{
+				StatusCode: http.StatusFound,
+				Header:     http.Header{"Location": []string{external.URL}},
+				Body:       http.NoBody,
+				Request:    req,
+			}, nil
+		}),
+		http.DefaultTransport,
+	)
+	client := &http.Client{Transport: router}
+	req, err := http.NewRequest(http.MethodGet, "https://open.feishu.cn/start", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := client.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+
+	if got := <-receivedHeader; got != "" {
+		t.Fatalf("redirect target received platform-scoped header %q", got)
+	}
+	if interceptor.calls != 1 {
+		t.Fatalf("extension calls = %d, want only the initial platform request", interceptor.calls)
+	}
+}
+
+func TestCloneHTTPTransportForRequestClassRebuildsDecorators(t *testing.T) {
+	wantErr := errors.New("preserved proxy policy")
+	base := &http.Transport{
+		Proxy: func(*http.Request) (*url.URL, error) {
+			return nil, wantErr
+		},
+	}
+	decorated := &cloneTestDecorator{base: base}
+	router := NewHTTPPolicyRouter(decorated, decorated)
+
+	rebuilt, concrete, ok := CloneHTTPTransportForRequestClass(router, exttransport.RequestClassExternal)
+	if !ok {
+		t.Fatal("CloneHTTPTransportForRequestClass() ok = false")
+	}
+	if concrete == base {
+		t.Fatal("CloneHTTPTransportForRequestClass() reused the original *http.Transport")
+	}
+	if _, ok := rebuilt.(*cloneTestDecorator); !ok {
+		t.Fatalf("rebuilt transport type = %T, want *cloneTestDecorator", rebuilt)
+	}
+
+	req, err := http.NewRequest(http.MethodGet, "https://external.example/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := rebuilt.RoundTrip(req); !errors.Is(err, wantErr) {
+		t.Fatalf("RoundTrip() error = %v, want %v", err, wantErr)
+	}
+}
+
+func TestCloneHTTPTransportForRequestClassPreservesAutomaticHTTP2(t *testing.T) {
+	previousProvider := exttransport.GetProvider()
+	exttransport.Register(nil)
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+	source := &http.Transport{
+		Proxy: http.ProxyURL(&url.URL{Scheme: "http", Host: "proxy.example:8080"}),
+	}
+	router := NewHTTPPolicyRouter(&http.Transport{}, source)
+
+	_, cloned, ok := CloneHTTPTransportForRequestClass(router, exttransport.RequestClassExternal)
+	if !ok {
+		t.Fatal("CloneHTTPTransportForRequestClass() ok = false")
+	}
+	if !cloned.ForceAttemptHTTP2 {
+		t.Fatal("ForceAttemptHTTP2 = false, want true")
+	}
+	if cloned.TLSNextProto != nil {
+		t.Fatal("TLSNextProto is non-nil, want automatic HTTP/2")
+	}
+}
+
+func TestCloneHTTPTransportForRequestClassKeepsOutermostIntent(t *testing.T) {
+	platformErr := errors.New("platform transport")
+	externalErr := errors.New("external transport")
+	newBlocked := func(reason error) *http.Transport {
+		return &http.Transport{Proxy: func(*http.Request) (*url.URL, error) { return nil, reason }}
+	}
+	router := NewHTTPPolicyRouter(newBlocked(platformErr), newBlocked(externalErr))
+	platform := ClientForRequestClass(&http.Client{Transport: router}, exttransport.RequestClassPlatform)
+	external := ClientForRequestClass(platform, exttransport.RequestClassExternal)
+
+	source, ok := external.Transport.(interface {
+		CloneHTTPTransport() (http.RoundTripper, *http.Transport, bool)
+	})
+	if !ok {
+		t.Fatalf("transport type %T has no clone capability", external.Transport)
+	}
+	rebuilt, _, ok := source.CloneHTTPTransport()
+	if !ok {
+		t.Fatal("CloneHTTPTransport() ok = false")
+	}
+	req, err := http.NewRequest(http.MethodGet, "https://open.feishu.cn/open-apis/test", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := rebuilt.RoundTrip(req); !errors.Is(err, externalErr) {
+		t.Fatalf("RoundTrip() error = %v, want outer external transport error %v", err, externalErr)
+	}
+}
+
+func TestClientForRequestClassOverridesCallerIntent(t *testing.T) {
+	platformErr := errors.New("platform transport")
+	externalErr := errors.New("external transport")
+	newBlocked := func(reason error) *http.Transport {
+		return &http.Transport{Proxy: func(*http.Request) (*url.URL, error) { return nil, reason }}
+	}
+	router := NewHTTPPolicyRouter(newBlocked(platformErr), newBlocked(externalErr))
+	client := ClientForRequestClass(&http.Client{Transport: router}, exttransport.RequestClassExternal)
+	req, err := http.NewRequest(http.MethodGet, "https://external.example/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	req = WithRequestClass(req, exttransport.RequestClassPlatform)
+
+	if _, err := client.Do(req); !errors.Is(err, externalErr) {
+		t.Fatalf("Do() error = %v, want forced external transport error %v", err, externalErr)
+	}
+}
+
+func TestTransformHTTPTransportReplacesLeafInsideDecorators(t *testing.T) {
+	exttransport.Register(nil)
+	decorated := &headerCloneTestDecorator{base: &http.Transport{}}
+	router := NewHTTPPolicyRouter(decorated, decorated)
+	client := ClientForRequestClass(&http.Client{Transport: router}, exttransport.RequestClassExternal)
+
+	source, ok := client.Transport.(interface {
+		TransformHTTPTransport(func(*http.Transport) (http.RoundTripper, bool)) (http.RoundTripper, bool)
+	})
+	if !ok {
+		t.Fatalf("transport type %T has no transform capability", client.Transport)
+	}
+	rebuilt, ok := source.TransformHTTPTransport(func(*http.Transport) (http.RoundTripper, bool) {
+		return roundTripFunc(func(req *http.Request) (*http.Response, error) {
+			if got := req.Header.Get("X-Decorator"); got != "applied" {
+				t.Fatalf("leaf received X-Decorator = %q, want applied", got)
+			}
+			return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+		}), true
+	})
+	if !ok {
+		t.Fatal("TransformHTTPTransport() ok = false")
+	}
+
+	req, err := http.NewRequest(http.MethodGet, "https://external.example/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := rebuilt.RoundTrip(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+}

internal/transport/shared.go

@@ -8,6 +8,8 @@ import (
 	"os"
 	"sync"
 	"time"
+
+	exttransport "github.com/larksuite/cli/extension/transport"
 )
 
 // Shared returns the base http.RoundTripper for all CLI HTTP clients.
@@ -55,21 +57,29 @@ func Fallback() *http.Transport {
 	return noProxyTransport()
 }
 
-// NewHTTPClient returns an *http.Client whose Transport is the shared,
-// proxy-plugin-aware base (see Shared). Prefer this over a bare &http.Client{}
-// for outbound requests: a bare client falls back to http.DefaultTransport and
-// therefore silently bypasses proxy plugin mode (fixed proxy + trusted CA, or
-// fail-closed), creating an audit blind spot.
+// NewHTTPClient returns a policy-routed client over the shared proxy-aware
+// transport. Known platform endpoints use the platform request class; all
+// other URLs use the external request class. Existing unscoped transport
+// providers continue to apply to both classes.
 //
 // A zero timeout means no client-level timeout (callers relying on context
 // deadlines pass 0).
 func NewHTTPClient(timeout time.Duration) *http.Client {
+	base := Shared()
 	return &http.Client{
-		Transport: Shared(),
+		Transport: NewHTTPPolicyRouter(base, base),
 		Timeout:   timeout,
 	}
 }
 
+// NewExternalHTTPClient returns a client for user-provided, pre-signed, CDN,
+// package-registry, and other non-platform URLs. It forces the external policy
+// while preserving the shared proxy configuration and the historical behavior
+// of unscoped transport providers. A zero timeout means no client-level timeout.
+func NewExternalHTTPClient(timeout time.Duration) *http.Client {
+	return ClientForRequestClass(NewHTTPClient(timeout), exttransport.RequestClassExternal)
+}
+
 // noProxyTransport is a proxy-disabled clone of http.DefaultTransport, lazily
 // built the first time LARK_CLI_NO_PROXY is observed set.
 var noProxyTransport = sync.OnceValue(func() *http.Transport {

internal/transport/shared_test.go

@@ -88,23 +88,24 @@ func TestShared_NoProxyOverridesSystemProxy(t *testing.T) {
 	}
 }
 
-// TestNewHTTPClient verifies the factory wires the shared proxy-plugin-aware
-// transport (instead of a bare client that bypasses proxy plugin mode).
-func TestNewHTTPClient(t *testing.T) {
+// TestHTTPClientConstructors verifies both the policy-routed client and its
+// forced-external view retain explicit transports and configured timeouts.
+func TestHTTPClientConstructors(t *testing.T) {
 	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
 	unsetProxyPluginEnv(t)
 	resetProxyPluginState()
 	t.Setenv(EnvNoProxy, "")
 
-	c := NewHTTPClient(7 * time.Second)
-	if c.Transport == nil {
-		t.Fatal("NewHTTPClient transport is nil; want shared transport")
-	}
-	if c.Transport != Shared() {
-		t.Errorf("NewHTTPClient transport = %v, want Shared()", c.Transport)
-	}
-	if c.Timeout != 7*time.Second {
-		t.Errorf("NewHTTPClient timeout = %v, want 7s", c.Timeout)
+	for name, client := range map[string]*http.Client{
+		"routed":   NewHTTPClient(7 * time.Second),
+		"external": NewExternalHTTPClient(7 * time.Second),
+	} {
+		if client.Transport == nil {
+			t.Fatalf("%s client transport is nil", name)
+		}
+		if client.Timeout != 7*time.Second {
+			t.Errorf("%s client timeout = %v, want 7s", name, client.Timeout)
+		}
 	}
 }
 
@@ -153,4 +154,32 @@ func TestShared_MalformedConfigFailsClosedEvenWithNoProxy(t *testing.T) {
 	if err == nil {
 		t.Fatalf("RoundTrip() err = nil (resp=%v); malformed config must fail closed", resp)
 	}
+
+	for name, test := range map[string]struct {
+		client *http.Client
+		url    string
+	}{
+		"platform": {
+			client: NewHTTPClient(time.Second),
+			url:    "https://open.feishu.cn/open-apis/test",
+		},
+		"external": {
+			client: NewHTTPClient(time.Second),
+			url:    "https://external.example/test",
+		},
+		"forced external": {
+			client: NewExternalHTTPClient(time.Second),
+			url:    "https://external.example/test",
+		},
+	} {
+		t.Run(name, func(t *testing.T) {
+			resp, err := test.client.Get(test.url)
+			if err == nil {
+				if resp != nil && resp.Body != nil {
+					resp.Body.Close()
+				}
+				t.Fatalf("policy-routed client succeeded with malformed proxy config")
+			}
+		})
+	}
 }

internal/update/update.go

@@ -62,10 +62,7 @@ func httpClient() *http.Client {
 	if DefaultClient != nil {
 		return DefaultClient
 	}
-	return &http.Client{
-		Timeout:   fetchTimeout,
-		Transport: transport.Shared(),
-	}
+	return transport.NewExternalHTTPClient(fetchTimeout)
 }
 
 // updateState is persisted to disk for caching.

internal/update/update_test.go

@@ -4,6 +4,7 @@
 package update
 
 import (
+	"context"
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
@@ -12,6 +13,8 @@ import (
 	"path/filepath"
 	"testing"
 	"time"
+
+	exttransport "github.com/larksuite/cli/extension/transport"
 )
 
 // roundTripFunc adapts a function to http.RoundTripper.
@@ -19,6 +22,30 @@ type roundTripFunc func(*http.Request) (*http.Response, error)
 
 func (f roundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) { return f(req) }
 
+type updateExternalProvider struct {
+	interceptor exttransport.Interceptor
+}
+
+func (p updateExternalProvider) Name() string { return "update-external-test" }
+
+func (p updateExternalProvider) ResolveInterceptor(context.Context) exttransport.Interceptor {
+	return p.interceptor
+}
+
+func (updateExternalProvider) SupportsRequestClass(class exttransport.RequestClass) bool {
+	return class == exttransport.RequestClassExternal
+}
+
+type updateExternalInterceptor struct {
+	calls int
+}
+
+func (i *updateExternalInterceptor) PreRoundTrip(req *http.Request) func(*http.Response, error) {
+	i.calls++
+	req.Header.Set("X-External-Route", "1")
+	return nil
+}
+
 // clearSkipEnv unsets all env vars that shouldSkip checks,
 // preventing the host environment (e.g. CI=true) from polluting test results.
 func clearSkipEnv(t *testing.T) {
@@ -242,6 +269,46 @@ func TestRefreshCache(t *testing.T) {
 	RefreshCache("1.0.0")
 }
 
+func TestHTTPClientUsesExternalRequestClass(t *testing.T) {
+	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
+	t.Setenv("LARK_CLI_NO_PROXY", "")
+	previousClient := DefaultClient
+	DefaultClient = nil
+	t.Cleanup(func() { DefaultClient = previousClient })
+
+	previousProvider := exttransport.GetProvider()
+	interceptor := &updateExternalInterceptor{}
+	exttransport.Register(updateExternalProvider{interceptor: interceptor})
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+
+	previousTransport := http.DefaultTransport
+	var receivedHeader string
+	http.DefaultTransport = roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		receivedHeader = req.Header.Get("X-External-Route")
+		return &http.Response{
+			StatusCode: http.StatusNoContent,
+			Header:     make(http.Header),
+			Body:       http.NoBody,
+			Request:    req,
+		}, nil
+	})
+	t.Cleanup(func() { http.DefaultTransport = previousTransport })
+
+	req, err := http.NewRequest(http.MethodGet, "https://open.feishu.cn/npm/latest", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := httpClient().Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+
+	if interceptor.calls != 1 || receivedHeader != "1" {
+		t.Fatalf("external route = calls %d, header %q; want 1, %q", interceptor.calls, receivedHeader, "1")
+	}
+}
+
 func TestPendingAtomicAccess(t *testing.T) {
 	// Initially nil
 	if got := GetPending(); got != nil {

internal/validate/url.go

@@ -5,11 +5,15 @@ package validate
 
 import (
 	"context"
+	"crypto/tls"
 	"fmt"
 	"net"
 	"net/http"
 	"net/url"
 	"strings"
+	"sync"
+
+	"github.com/larksuite/cli/errs"
 )
 
 const (
@@ -34,6 +38,9 @@ func isRestrictedDownloadIP(ip net.IP) bool {
 		return true
 	}
 	if v4 := ip.To4(); v4 != nil {
+		if v4[0] == 0 { // RFC 1122 "this network"
+			return true
+		}
 		if v4[0] == 10 || v4[0] == 127 {
 			return true
 		}
@@ -52,6 +59,9 @@ func isRestrictedDownloadIP(ip net.IP) bool {
 		if v4[0] == 198 && (v4[1] == 18 || v4[1] == 19) { // RFC2544 benchmarking
 			return true
 		}
+		if v4[0] >= 240 {
+			return true
+		}
 		return false
 	}
 	if ip.IsPrivate() {
@@ -76,32 +86,42 @@ func ValidateDownloadSourceURL(ctx context.Context, rawURL string) error {
 	if u.Scheme != "http" && u.Scheme != "https" {
 		return fmt.Errorf("only http/https URLs are supported")
 	}
-	host := strings.TrimSpace(strings.ToLower(u.Hostname()))
+	_, err = resolveDownloadHost(ctx, u.Hostname(), net.DefaultResolver.LookupIP)
+	return err
+}
+
+type downloadLookupIPFunc func(context.Context, string, string) ([]net.IP, error)
+
+func resolveDownloadHost(ctx context.Context, rawHost string, lookupIP downloadLookupIPFunc) ([]net.IP, error) {
+	host := strings.TrimSpace(strings.ToLower(rawHost))
 	if host == "" {
-		return fmt.Errorf("URL host is required")
+		return nil, fmt.Errorf("URL host is required")
 	}
 	if host == "localhost" || strings.HasSuffix(host, ".localhost") {
-		return fmt.Errorf("local/internal host is not allowed")
+		return nil, fmt.Errorf("local/internal host is not allowed")
 	}
 	if ip := net.ParseIP(host); ip != nil {
 		if isRestrictedDownloadIP(ip) {
-			return fmt.Errorf("local/internal host is not allowed")
+			return nil, fmt.Errorf("local/internal host is not allowed")
 		}
-		return nil
+		return []net.IP{ip}, nil
 	}
-	ips, err := net.DefaultResolver.LookupIP(ctx, "ip", host)
+	if lookupIP == nil {
+		lookupIP = net.DefaultResolver.LookupIP
+	}
+	ips, err := lookupIP(ctx, "ip", host)
 	if err != nil {
-		return fmt.Errorf("failed to resolve host")
+		return nil, fmt.Errorf("failed to resolve host")
 	}
 	if len(ips) == 0 {
-		return fmt.Errorf("failed to resolve host")
+		return nil, fmt.Errorf("failed to resolve host")
 	}
 	for _, ip := range ips {
 		if isRestrictedDownloadIP(ip) {
-			return fmt.Errorf("local/internal host is not allowed")
+			return nil, fmt.Errorf("local/internal host is not allowed")
 		}
 	}
-	return nil
+	return ips, nil
 }
 
 // NewDownloadHTTPClient clones base client and enforces download-safe redirect
@@ -115,7 +135,10 @@ func NewDownloadHTTPClient(base *http.Client, opts DownloadHTTPClientOptions) *h
 	}
 
 	cloned := *base
-	cloned.Transport = cloneDownloadTransport(base.Transport)
+	cloned.Transport = &downloadSchemeTransport{
+		base:      cloneDownloadTransport(base.Transport),
+		allowHTTP: opts.AllowHTTP,
+	}
 	cloned.CheckRedirect = func(req *http.Request, via []*http.Request) error {
 		if len(via) >= opts.MaxRedirects {
 			return fmt.Errorf("too many redirects")
@@ -138,18 +161,310 @@ func NewDownloadHTTPClient(base *http.Client, opts DownloadHTTPClientOptions) *h
 	return &cloned
 }
 
-func cloneDownloadTransport(base http.RoundTripper) *http.Transport {
-	var cloned *http.Transport
-	if src, ok := base.(*http.Transport); ok && src != nil {
-		cloned = src.Clone()
-	} else {
-		if def, ok := http.DefaultTransport.(*http.Transport); ok && def != nil {
-			cloned = def.Clone()
-		} else {
-			cloned = &http.Transport{}
-		}
+type downloadSchemeTransport struct {
+	base      http.RoundTripper
+	allowHTTP bool
+}
+
+func (t *downloadSchemeTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	if req == nil || req.URL == nil {
+		return nil, errs.NewInternalError(
+			errs.SubtypeUnknown,
+			"download transport received a nil request",
+		)
+	}
+	switch {
+	case strings.EqualFold(req.URL.Scheme, "https"):
+	case t.allowHTTP && strings.EqualFold(req.URL.Scheme, "http"):
+	default:
+		return nil, errs.NewSecurityPolicyError(
+			errs.SubtypeAccessDenied,
+			"only https URLs are supported",
+		)
+	}
+	return t.base.RoundTrip(req)
+}
+
+type selectedDownloadProxyKey struct{}
+
+type proxyAwareDownloadTransport struct {
+	selectProxy func(*http.Request) (*url.URL, error)
+	direct      http.RoundTripper
+	proxied     *http.Transport
+	lookupIP    downloadLookupIPFunc
+
+	mu                 sync.Mutex
+	proxiedByTLSServer map[string]*http.Transport
+}
+
+func (t *proxyAwareDownloadTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	if req == nil || req.URL == nil {
+		return nil, fmt.Errorf("download transport received a nil request")
+	}
+	proxyURL, err := t.selectProxy(req)
+	if err != nil {
+		return nil, err
+	}
+	if proxyURL == nil {
+		return t.direct.RoundTrip(req)
 	}
 
+	targetIPs, err := resolveDownloadHost(req.Context(), req.URL.Hostname(), t.lookupIP)
+	if err != nil {
+		return nil, errs.NewSecurityPolicyError(
+			errs.SubtypeAccessDenied,
+			"blocked download target: %v",
+			err,
+		).WithCause(err)
+	}
+	if strings.EqualFold(req.URL.Scheme, "http") && net.ParseIP(req.URL.Hostname()) == nil {
+		// HTTP proxies cannot pin the target IP separately from the Host header.
+		return nil, errs.NewSecurityPolicyError(
+			errs.SubtypeAccessDenied,
+			"plain HTTP hostname downloads through a proxy are not allowed",
+		).WithHint("use HTTPS or a literal public IP")
+	}
+
+	selected := *proxyURL
+	proxied := t.proxied
+	if strings.EqualFold(req.URL.Scheme, "https") {
+		proxied = t.proxiedTransportForTLSServer(req.URL.Hostname())
+	}
+
+	var lastErr error
+	for index, targetIP := range targetIPs {
+		proxiedReq, pinErr := pinDownloadRequestTargetToIP(req, targetIP)
+		if pinErr != nil {
+			return nil, pinErr
+		}
+		ctx := context.WithValue(proxiedReq.Context(), selectedDownloadProxyKey{}, &selected)
+		proxiedReq = proxiedReq.WithContext(ctx)
+
+		resp, roundTripErr := proxied.RoundTrip(proxiedReq)
+		if roundTripErr == nil {
+			if resp != nil {
+				// Hide the internal pinned URL from redirect handling.
+				resp.Request = req
+			}
+			return resp, nil
+		}
+		lastErr = roundTripErr
+		if resp != nil && resp.Body != nil {
+			resp.Body.Close()
+		}
+		if req.Context().Err() != nil {
+			break
+		}
+		if index+1 < len(targetIPs) && !canRetryDownloadTarget(req) {
+			break
+		}
+	}
+	return nil, lastErr
+}
+
+func (t *proxyAwareDownloadTransport) CloseIdleConnections() {
+	if closer, ok := t.direct.(interface{ CloseIdleConnections() }); ok {
+		closer.CloseIdleConnections()
+	}
+	t.proxied.CloseIdleConnections()
+
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	for _, transport := range t.proxiedByTLSServer {
+		transport.CloseIdleConnections()
+	}
+}
+
+func (t *proxyAwareDownloadTransport) proxiedTransportForTLSServer(serverName string) *http.Transport {
+	if configured := t.proxied.TLSClientConfig; configured != nil && configured.ServerName != "" {
+		serverName = configured.ServerName
+	}
+
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	if transport := t.proxiedByTLSServer[serverName]; transport != nil {
+		return transport
+	}
+
+	transport := t.proxied.Clone()
+	targetTLSConfig := cloneDownloadTLSConfig(transport.TLSClientConfig)
+	targetTLSConfig.ServerName = serverName
+	transport.TLSClientConfig = targetTLSConfig
+	configureHTTPSProxyTLSDialer(transport, t.proxied)
+	if t.proxiedByTLSServer == nil {
+		t.proxiedByTLSServer = make(map[string]*http.Transport)
+	}
+	t.proxiedByTLSServer[serverName] = transport
+	return transport
+}
+
+type blockedDownloadTransport struct {
+	err error
+}
+
+func (t *blockedDownloadTransport) RoundTrip(*http.Request) (*http.Response, error) {
+	return nil, t.err
+}
+
+func cloneDownloadTransport(base http.RoundTripper) http.RoundTripper {
+	if base == nil {
+		base = http.DefaultTransport
+	}
+	if source, ok := base.(interface {
+		TransformHTTPTransport(func(*http.Transport) (http.RoundTripper, bool)) (http.RoundTripper, bool)
+	}); ok {
+		rebuilt, transformed := source.TransformHTTPTransport(newDownloadTransportLeaf)
+		if transformed && rebuilt != nil {
+			return rebuilt
+		}
+	}
+	if source, ok := base.(*http.Transport); ok && source != nil {
+		rebuilt, transformed := newDownloadTransportLeaf(source)
+		if transformed && rebuilt != nil {
+			return rebuilt
+		}
+	}
+	return &blockedDownloadTransport{err: errs.NewInternalError(
+		errs.SubtypeUnknown,
+		"cannot safely clone download transport %T",
+		base,
+	)}
+}
+
+func newDownloadTransportLeaf(source *http.Transport) (http.RoundTripper, bool) {
+	return newDownloadTransportLeafWithResolver(source, net.DefaultResolver.LookupIP)
+}
+
+func newDownloadTransportLeafWithResolver(source *http.Transport, lookupIP downloadLookupIPFunc) (http.RoundTripper, bool) {
+	if source == nil {
+		return nil, false
+	}
+
+	selectProxy := source.Proxy
+	direct := cloneDownloadHTTPTransport(source)
+	direct.Proxy = nil
+	configureDirectDownloadTransport(direct)
+	if selectProxy == nil {
+		return direct, true
+	}
+
+	// The proxied branch validates the requested URL before construction and
+	// on every redirect. Its TCP peer is the selected proxy, so applying the
+	// direct-origin IP guard there would incorrectly reject trusted loopback or
+	// private-network proxies. Freeze the selected proxy in request context so
+	// a stateful selector cannot switch the second lookup to direct egress.
+	proxied := cloneDownloadHTTPTransport(source)
+	proxied.Proxy = func(req *http.Request) (*url.URL, error) {
+		selected, ok := req.Context().Value(selectedDownloadProxyKey{}).(*url.URL)
+		if !ok || selected == nil {
+			return nil, fmt.Errorf("download proxy selection is missing")
+		}
+		cloned := *selected
+		return &cloned, nil
+	}
+	return &proxyAwareDownloadTransport{
+		selectProxy:        selectProxy,
+		direct:             direct,
+		proxied:            proxied,
+		lookupIP:           lookupIP,
+		proxiedByTLSServer: make(map[string]*http.Transport),
+	}, true
+}
+
+func cloneDownloadHTTPTransport(source *http.Transport) *http.Transport {
+	cloned := source.Clone()
+	if cloned.TLSNextProto == nil {
+		if _, ok := source.TLSNextProto["h2"]; ok {
+			cloned.ForceAttemptHTTP2 = true
+		}
+	}
+	return cloned
+}
+
+func pinDownloadRequestTargetToIP(req *http.Request, targetIP net.IP) (*http.Request, error) {
+	if req == nil || req.URL == nil {
+		return nil, fmt.Errorf("download request URL is missing")
+	}
+	if targetIP == nil || isRestrictedDownloadIP(targetIP) {
+		return nil, fmt.Errorf("blocked download target: local/internal host is not allowed")
+	}
+
+	originalHost := req.URL.Host
+	pinnedHost := targetIP.String()
+	if port := req.URL.Port(); port != "" {
+		pinnedHost = net.JoinHostPort(pinnedHost, port)
+	} else if strings.Contains(pinnedHost, ":") {
+		pinnedHost = "[" + pinnedHost + "]"
+	}
+
+	pinned := req.Clone(req.Context())
+	pinnedURL := *req.URL
+	pinnedURL.Host = pinnedHost
+	pinned.URL = &pinnedURL
+	pinned.Host = originalHost
+	return pinned, nil
+}
+
+func canRetryDownloadTarget(req *http.Request) bool {
+	if req == nil || req.Body != nil {
+		return false
+	}
+	return req.Method == http.MethodGet || req.Method == http.MethodHead
+}
+
+func cloneDownloadTLSConfig(config *tls.Config) *tls.Config {
+	if config == nil {
+		return &tls.Config{MinVersion: tls.VersionTLS12}
+	}
+	return config.Clone()
+}
+
+func configureHTTPSProxyTLSDialer(transport, source *http.Transport) {
+	if transport.DialTLSContext != nil || transport.DialTLS != nil {
+		return
+	}
+
+	proxyTLSConfig := cloneDownloadTLSConfig(source.TLSClientConfig)
+	transport.DialTLSContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
+		rawConn, err := dialDownloadProxy(ctx, source, network, addr)
+		if err != nil {
+			return nil, err
+		}
+
+		config := proxyTLSConfig.Clone()
+		serverName, _, splitErr := net.SplitHostPort(addr)
+		if splitErr != nil {
+			rawConn.Close()
+			return nil, fmt.Errorf("invalid HTTPS proxy address: %w", splitErr)
+		}
+		config.ServerName = serverName
+		tlsConn := tls.Client(rawConn, config)
+		handshakeCtx := ctx
+		cancel := func() {}
+		if source.TLSHandshakeTimeout > 0 {
+			handshakeCtx, cancel = context.WithTimeout(ctx, source.TLSHandshakeTimeout)
+		}
+		defer cancel()
+		if err := tlsConn.HandshakeContext(handshakeCtx); err != nil {
+			rawConn.Close()
+			return nil, err
+		}
+		return tlsConn, nil
+	}
+}
+
+func dialDownloadProxy(ctx context.Context, source *http.Transport, network, addr string) (net.Conn, error) {
+	if source.DialContext != nil {
+		return source.DialContext(ctx, network, addr)
+	}
+	if source.Dial != nil {
+		return source.Dial(network, addr)
+	}
+	var dialer net.Dialer
+	return dialer.DialContext(ctx, network, addr)
+}
+
+func configureDirectDownloadTransport(cloned *http.Transport) {
 	origDial := cloned.DialContext
 	cloned.DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
 		conn, err := dialConn(ctx, origDial, network, addr)
@@ -158,7 +473,7 @@ func cloneDownloadTransport(base http.RoundTripper) *http.Transport {
 		}
 		if err := validateConnRemoteIP(conn); err != nil {
 			conn.Close()
-			return nil, err
+			return nil, downloadTargetPolicyError(err)
 		}
 		return conn, nil
 	}
@@ -172,13 +487,26 @@ func cloneDownloadTransport(base http.RoundTripper) *http.Transport {
 			}
 			if err := validateConnRemoteIP(conn); err != nil {
 				conn.Close()
+				return nil, downloadTargetPolicyError(err)
+			}
+			return conn, nil
+		}
+	}
+	if cloned.DialTLS != nil {
+		origDialTLS := cloned.DialTLS
+		cloned.DialTLS = func(network, addr string) (net.Conn, error) {
+			conn, err := origDialTLS(network, addr)
+			if err != nil {
 				return nil, err
 			}
+			if err := validateConnRemoteIP(conn); err != nil {
+				conn.Close()
+				return nil, downloadTargetPolicyError(err)
+			}
 			return conn, nil
 		}
 	}
 
-	return cloned
 }
 
 // DialContextFunc is the signature for DialContext / DialTLSContext.
@@ -194,7 +522,7 @@ func WrapDialContextWithIPCheck(origDial DialContextFunc) DialContextFunc {
 		}
 		if err := validateConnRemoteIP(conn); err != nil {
 			conn.Close()
-			return nil, err
+			return nil, downloadTargetPolicyError(err)
 		}
 		return conn, nil
 	}
@@ -208,6 +536,14 @@ func dialConn(ctx context.Context, dialFn func(context.Context, string, string)
 	return d.DialContext(ctx, network, addr)
 }
 
+func downloadTargetPolicyError(err error) error {
+	return errs.NewSecurityPolicyError(
+		errs.SubtypeAccessDenied,
+		"blocked download target: %v",
+		err,
+	).WithCause(err)
+}
+
 func validateConnRemoteIP(conn net.Conn) error {
 	if conn == nil {
 		return fmt.Errorf("nil connection")

internal/validate/url_internal_test.go

@@ -0,0 +1,529 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package validate
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strings"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/larksuite/cli/errs"
+)
+
+func TestProxiedHTTPSDownloadPinsValidatedTargetIP(t *testing.T) {
+	const (
+		targetHost = "rebind.example"
+		targetIP   = "203.0.113.10"
+	)
+
+	proxyCalled := make(chan struct{}, 1)
+	proxy := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		proxyCalled <- struct{}{}
+		if req.Method != http.MethodConnect {
+			t.Errorf("proxy request method = %q, want CONNECT", req.Method)
+		}
+		if got := req.Host; got != targetIP+":443" {
+			t.Errorf("proxy CONNECT target = %q, want validated IP %q", got, targetIP+":443")
+		}
+		w.WriteHeader(http.StatusBadGateway)
+	}))
+	t.Cleanup(proxy.Close)
+	proxyURL, err := url.Parse(proxy.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	lookupIP := func(context.Context, string, string) ([]net.IP, error) {
+		return []net.IP{net.ParseIP(targetIP)}, nil
+	}
+	transport, ok := newDownloadTransportLeafWithResolver(
+		&http.Transport{Proxy: http.ProxyURL(proxyURL)},
+		lookupIP,
+	)
+	if !ok {
+		t.Fatal("newDownloadTransportLeafWithResolver() did not rebuild transport")
+	}
+
+	req, err := http.NewRequest(http.MethodGet, "https://"+targetHost+"/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	pinned, err := pinDownloadRequestTargetToIP(req, net.ParseIP(targetIP))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if pinned.Host != targetHost {
+		t.Fatalf("pinned request Host = %q, want %q", pinned.Host, targetHost)
+	}
+	if _, err := transport.RoundTrip(req); err == nil {
+		t.Fatal("RoundTrip() error = nil, want proxy rejection after CONNECT")
+	}
+	select {
+	case <-proxyCalled:
+	default:
+		t.Fatal("proxy was not called")
+	}
+}
+
+func TestRestrictedDownloadIPBlocksReservedIPv4(t *testing.T) {
+	for _, rawIP := range []string{"0.1.2.3", "240.0.0.1"} {
+		if !isRestrictedDownloadIP(net.ParseIP(rawIP)) {
+			t.Fatalf("%s was classified as safe", rawIP)
+		}
+	}
+	if isRestrictedDownloadIP(net.ParseIP("1.1.1.1")) {
+		t.Fatal("1.1.1.1 was classified as restricted")
+	}
+}
+
+func TestCloneDownloadTLSConfigSetsMinimumVersion(t *testing.T) {
+	if got := cloneDownloadTLSConfig(nil).MinVersion; got != tls.VersionTLS12 {
+		t.Fatalf("MinVersion = %d, want TLS 1.2", got)
+	}
+	configured := &tls.Config{MinVersion: tls.VersionTLS13}
+	if got := cloneDownloadTLSConfig(configured).MinVersion; got != tls.VersionTLS13 {
+		t.Fatalf("cloned MinVersion = %d, want TLS 1.3", got)
+	}
+}
+
+func TestCloneDownloadHTTPTransportPreservesHTTP2Policy(t *testing.T) {
+	tests := []struct {
+		name            string
+		source          *http.Transport
+		wantForce       bool
+		wantH2Handler   bool
+		wantProtocolMap bool
+	}{
+		{
+			name: "automatic",
+			source: &http.Transport{
+				Proxy: http.ProxyURL(&url.URL{Scheme: "http", Host: "proxy.example:8080"}),
+			},
+			wantForce: true,
+		},
+		{
+			name: "custom TLS without opt-in",
+			source: &http.Transport{
+				TLSClientConfig: &tls.Config{MinVersion: tls.VersionTLS12},
+			},
+		},
+		{
+			name: "custom dial without opt-in",
+			source: &http.Transport{
+				DialContext: func(context.Context, string, string) (net.Conn, error) {
+					return nil, errors.New("unused")
+				},
+			},
+		},
+		{
+			name:      "explicit opt-in",
+			source:    &http.Transport{ForceAttemptHTTP2: true},
+			wantForce: true,
+		},
+		{
+			name: "explicit h2 handler",
+			source: &http.Transport{
+				TLSNextProto: map[string]func(string, *tls.Conn) http.RoundTripper{
+					"h2": func(string, *tls.Conn) http.RoundTripper { return nil },
+				},
+			},
+			wantH2Handler:   true,
+			wantProtocolMap: true,
+		},
+		{
+			name: "explicit opt-out",
+			source: &http.Transport{
+				TLSNextProto: map[string]func(string, *tls.Conn) http.RoundTripper{},
+			},
+			wantProtocolMap: true,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			cloned := cloneDownloadHTTPTransport(test.source)
+			if cloned.ForceAttemptHTTP2 != test.wantForce {
+				t.Fatalf("ForceAttemptHTTP2 = %v, want %v", cloned.ForceAttemptHTTP2, test.wantForce)
+			}
+			_, hasH2Handler := cloned.TLSNextProto["h2"]
+			if hasH2Handler != test.wantH2Handler {
+				t.Fatalf("h2 handler = %v, want %v", hasH2Handler, test.wantH2Handler)
+			}
+			if hasProtocolMap := cloned.TLSNextProto != nil; hasProtocolMap != test.wantProtocolMap {
+				t.Fatalf("TLSNextProto is non-nil = %v, want %v", hasProtocolMap, test.wantProtocolMap)
+			}
+		})
+	}
+}
+
+func TestCloneDownloadTransportPreservesAutomaticHTTP2(t *testing.T) {
+	source := &http.Transport{
+		Proxy: http.ProxyURL(&url.URL{Scheme: "http", Host: "proxy.example:8080"}),
+	}
+	rebuilt := cloneDownloadTransport(source)
+	proxyAware, ok := rebuilt.(*proxyAwareDownloadTransport)
+	if !ok {
+		t.Fatalf("transport type = %T, want *proxyAwareDownloadTransport", rebuilt)
+	}
+	direct, ok := proxyAware.direct.(*http.Transport)
+	if !ok {
+		t.Fatalf("direct transport type = %T, want *http.Transport", proxyAware.direct)
+	}
+	for name, transport := range map[string]*http.Transport{
+		"direct":  direct,
+		"proxied": proxyAware.proxied,
+	} {
+		if !transport.ForceAttemptHTTP2 {
+			t.Fatalf("%s ForceAttemptHTTP2 = false, want true", name)
+		}
+	}
+}
+
+func TestProxiedDownloadRejectsRestrictedResolvedTarget(t *testing.T) {
+	var proxyCalled atomic.Bool
+	proxy := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		proxyCalled.Store(true)
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(proxy.Close)
+	proxyURL, err := url.Parse(proxy.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	lookupIP := func(context.Context, string, string) ([]net.IP, error) {
+		return []net.IP{net.ParseIP("127.0.0.1")}, nil
+	}
+	transport, ok := newDownloadTransportLeafWithResolver(
+		&http.Transport{Proxy: http.ProxyURL(proxyURL)},
+		lookupIP,
+	)
+	if !ok {
+		t.Fatal("newDownloadTransportLeafWithResolver() did not rebuild transport")
+	}
+
+	req, err := http.NewRequest(http.MethodGet, "http://rebind.example/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = transport.RoundTrip(req)
+	if err == nil {
+		t.Fatal("RoundTrip() error = nil, want restricted target rejection")
+	}
+	if problem, ok := errs.ProblemOf(err); !ok ||
+		problem.Category != errs.CategoryPolicy ||
+		problem.Subtype != errs.SubtypeAccessDenied {
+		t.Fatalf("RoundTrip() problem = %#v, %v; want policy/access_denied", problem, ok)
+	}
+	if proxyCalled.Load() {
+		t.Fatal("proxy was called for a restricted resolved target")
+	}
+}
+
+func TestProxiedPlainHTTPHostnameRejectsLocalProxy(t *testing.T) {
+	var proxyCalled atomic.Bool
+	proxy := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		proxyCalled.Store(true)
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(proxy.Close)
+	proxyURL, err := url.Parse(proxy.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	lookupIP := func(ctx context.Context, _, host string) ([]net.IP, error) {
+		if host == "public.example" {
+			return []net.IP{net.ParseIP("203.0.113.10")}, nil
+		}
+		return net.DefaultResolver.LookupIP(ctx, "ip", host)
+	}
+	transport, ok := newDownloadTransportLeafWithResolver(
+		&http.Transport{Proxy: http.ProxyURL(proxyURL)},
+		lookupIP,
+	)
+	if !ok {
+		t.Fatal("newDownloadTransportLeafWithResolver() did not rebuild transport")
+	}
+
+	req, err := http.NewRequest(http.MethodGet, "http://public.example/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, err = transport.RoundTrip(req)
+	if err == nil {
+		t.Fatal("RoundTrip() error = nil, want plain HTTP hostname rejection")
+	}
+	if problem, ok := errs.ProblemOf(err); !ok ||
+		problem.Category != errs.CategoryPolicy ||
+		problem.Subtype != errs.SubtypeAccessDenied {
+		t.Fatalf("RoundTrip() problem = %#v, %v; want policy/access_denied", problem, ok)
+	} else if problem.Hint != "use HTTPS or a literal public IP" {
+		t.Fatalf("RoundTrip() hint = %q, want recovery guidance", problem.Hint)
+	}
+	if proxyCalled.Load() {
+		t.Fatal("proxy was called for a plain HTTP hostname target")
+	}
+}
+
+func TestProxiedHTTPSDownloadTriesEveryValidatedTargetIP(t *testing.T) {
+	connectTargets := make(chan string, 2)
+	proxy := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		connectTargets <- req.Host
+		w.WriteHeader(http.StatusBadGateway)
+	}))
+	t.Cleanup(proxy.Close)
+	proxyURL, err := url.Parse(proxy.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	transport, ok := newDownloadTransportLeafWithResolver(
+		&http.Transport{Proxy: http.ProxyURL(proxyURL)},
+		func(context.Context, string, string) ([]net.IP, error) {
+			return []net.IP{
+				net.ParseIP("203.0.113.10"),
+				net.ParseIP("203.0.113.11"),
+			}, nil
+		},
+	)
+	if !ok {
+		t.Fatal("newDownloadTransportLeafWithResolver() did not rebuild transport")
+	}
+
+	req, err := http.NewRequest(http.MethodGet, "https://multi.example/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := transport.RoundTrip(req); err == nil {
+		t.Fatal("RoundTrip() error = nil, want proxy rejection")
+	}
+	for _, want := range []string{"203.0.113.10:443", "203.0.113.11:443"} {
+		select {
+		case got := <-connectTargets:
+			if got != want {
+				t.Fatalf("proxy CONNECT target = %q, want %q", got, want)
+			}
+		default:
+			t.Fatalf("proxy did not receive CONNECT target %q", want)
+		}
+	}
+}
+
+func TestCanRetryDownloadTargetOnlyAllowsBodylessReads(t *testing.T) {
+	for _, test := range []struct {
+		method string
+		body   string
+		want   bool
+	}{
+		{method: http.MethodGet, want: true},
+		{method: http.MethodHead, want: true},
+		{method: http.MethodPost},
+		{method: http.MethodGet, body: "body"},
+	} {
+		req, err := http.NewRequest(test.method, "https://download.example/file", strings.NewReader(test.body))
+		if err != nil {
+			t.Fatal(err)
+		}
+		if test.body == "" {
+			req.Body = nil
+		}
+		if got := canRetryDownloadTarget(req); got != test.want {
+			t.Fatalf("canRetryDownloadTarget(%s, body=%q) = %v, want %v", test.method, test.body, got, test.want)
+		}
+	}
+}
+
+func TestProxiedHTTPSTargetPreservesOriginalTLSServerName(t *testing.T) {
+	transport, ok := newDownloadTransportLeafWithResolver(
+		&http.Transport{Proxy: http.ProxyURL(&url.URL{Scheme: "http", Host: "proxy.example:8080"})},
+		func(context.Context, string, string) ([]net.IP, error) {
+			return []net.IP{net.ParseIP("203.0.113.10")}, nil
+		},
+	)
+	if !ok {
+		t.Fatal("newDownloadTransportLeafWithResolver() did not rebuild transport")
+	}
+	proxyAware, ok := transport.(*proxyAwareDownloadTransport)
+	if !ok {
+		t.Fatalf("transport type = %T, want *proxyAwareDownloadTransport", transport)
+	}
+
+	pinned := proxyAware.proxiedTransportForTLSServer("download.example")
+	if pinned.TLSClientConfig == nil {
+		t.Fatal("TLSClientConfig = nil")
+	}
+	if pinned.TLSClientConfig.ServerName != "download.example" {
+		t.Fatalf("TLS ServerName = %q, want download.example", pinned.TLSClientConfig.ServerName)
+	}
+	if proxyAware.proxied.TLSClientConfig != nil && proxyAware.proxied.TLSClientConfig.ServerName != "" {
+		t.Fatalf("base proxy TLS ServerName = %q, want unchanged", proxyAware.proxied.TLSClientConfig.ServerName)
+	}
+}
+
+func TestHTTPSProxyTLSDialerUsesLegacyDial(t *testing.T) {
+	wantErr := errors.New("legacy dial used")
+	source := &http.Transport{
+		Dial: func(string, string) (net.Conn, error) {
+			return nil, wantErr
+		},
+	}
+	target := source.Clone()
+	configureHTTPSProxyTLSDialer(target, source)
+	if target.DialTLSContext == nil {
+		t.Fatal("DialTLSContext = nil")
+	}
+	if _, err := target.DialTLSContext(context.Background(), "tcp", "proxy.example:443"); !errors.Is(err, wantErr) {
+		t.Fatalf("DialTLSContext() error = %v, want %v", err, wantErr)
+	}
+}
+
+func TestDirectDownloadLegacyDialTLSClosesRestrictedConnection(t *testing.T) {
+	clientConn, serverConn := net.Pipe()
+	t.Cleanup(func() { serverConn.Close() })
+	conn := &trackedDownloadConn{
+		Conn:       clientConn,
+		remoteAddr: &net.TCPAddr{IP: net.ParseIP("127.0.0.1"), Port: 443},
+	}
+	rebuilt, ok := newDownloadTransportLeaf(&http.Transport{
+		DialTLS: func(string, string) (net.Conn, error) {
+			return conn, nil
+		},
+	})
+	if !ok {
+		t.Fatal("newDownloadTransportLeaf() did not rebuild transport")
+	}
+	transport, ok := rebuilt.(*http.Transport)
+	if !ok {
+		t.Fatalf("rebuilt transport = %T, want *http.Transport", rebuilt)
+	}
+
+	_, err := transport.DialTLS("tcp", "public.example:443")
+	if err == nil || !strings.Contains(err.Error(), "local/internal host is not allowed") {
+		t.Fatalf("DialTLS() error = %v, want restricted target rejection", err)
+	}
+	if problem, ok := errs.ProblemOf(err); !ok ||
+		problem.Category != errs.CategoryPolicy ||
+		problem.Subtype != errs.SubtypeAccessDenied {
+		t.Fatalf("DialTLS() problem = %#v, %v; want policy/access_denied", problem, ok)
+	}
+	if !conn.closed {
+		t.Fatal("restricted connection was not closed")
+	}
+}
+
+func TestDirectDownloadLegacyDialTLSPreservesDialError(t *testing.T) {
+	wantErr := errors.New("dial failed")
+	rebuilt, ok := newDownloadTransportLeaf(&http.Transport{
+		DialTLS: func(string, string) (net.Conn, error) {
+			return nil, wantErr
+		},
+	})
+	if !ok {
+		t.Fatal("newDownloadTransportLeaf() did not rebuild transport")
+	}
+	transport, ok := rebuilt.(*http.Transport)
+	if !ok {
+		t.Fatalf("rebuilt transport = %T, want *http.Transport", rebuilt)
+	}
+
+	if _, err := transport.DialTLS("tcp", "public.example:443"); !errors.Is(err, wantErr) {
+		t.Fatalf("DialTLS() error = %v, want %v", err, wantErr)
+	}
+}
+
+func TestHTTPSProxyTLSDialerRetainsHandshakeTimeout(t *testing.T) {
+	clientConn, serverConn := net.Pipe()
+	t.Cleanup(func() {
+		clientConn.Close()
+		serverConn.Close()
+	})
+	source := &http.Transport{
+		DialContext: func(context.Context, string, string) (net.Conn, error) {
+			return clientConn, nil
+		},
+		TLSHandshakeTimeout: 50 * time.Millisecond,
+	}
+	target := source.Clone()
+	configureHTTPSProxyTLSDialer(target, source)
+
+	started := time.Now()
+	if _, err := target.DialTLSContext(context.Background(), "tcp", "proxy.example:443"); err == nil {
+		t.Fatal("DialTLSContext() error = nil, want TLS handshake timeout")
+	}
+	if elapsed := time.Since(started); elapsed > time.Second {
+		t.Fatalf("TLS handshake timeout took %s, want under 1s", elapsed)
+	}
+}
+
+func TestHTTPSProxyTLSDialerUsesProxyServerName(t *testing.T) {
+	server := httptest.NewTLSServer(http.HandlerFunc(func(http.ResponseWriter, *http.Request) {}))
+	t.Cleanup(server.Close)
+
+	clientConn, serverConn := net.Pipe()
+	t.Cleanup(func() {
+		clientConn.Close()
+		serverConn.Close()
+	})
+
+	proxySNI := make(chan string, 1)
+	serverTLSConfig := server.TLS.Clone()
+	serverTLSConfig.GetConfigForClient = func(info *tls.ClientHelloInfo) (*tls.Config, error) {
+		proxySNI <- info.ServerName
+		return nil, nil
+	}
+	serverErr := make(chan error, 1)
+	go func() {
+		serverErr <- tls.Server(serverConn, serverTLSConfig).Handshake()
+	}()
+
+	roots := x509.NewCertPool()
+	roots.AddCert(server.Certificate())
+	source := &http.Transport{
+		DialContext: func(context.Context, string, string) (net.Conn, error) {
+			return clientConn, nil
+		},
+		TLSClientConfig: &tls.Config{
+			RootCAs:    roots,
+			ServerName: "target.example.com",
+		},
+	}
+	target := source.Clone()
+	configureHTTPSProxyTLSDialer(target, source)
+
+	conn, err := target.DialTLSContext(context.Background(), "tcp", "example.com:443")
+	if err != nil {
+		t.Fatal(err)
+	}
+	conn.Close()
+	if err := <-serverErr; err != nil {
+		t.Fatal(err)
+	}
+	if got := <-proxySNI; got != "example.com" {
+		t.Fatalf("proxy TLS ServerName = %q, want example.com", got)
+	}
+}
+
+type trackedDownloadConn struct {
+	net.Conn
+	remoteAddr net.Addr
+	closed     bool
+}
+
+func (c *trackedDownloadConn) RemoteAddr() net.Addr {
+	return c.remoteAddr
+}
+
+func (c *trackedDownloadConn) Close() error {
+	c.closed = true
+	return c.Conn.Close()
+}

internal/validate/url_test.go

@@ -0,0 +1,222 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package validate_test
+
+import (
+	"context"
+	"crypto/tls"
+	"errors"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strings"
+	"testing"
+
+	"github.com/larksuite/cli/errs"
+	exttransport "github.com/larksuite/cli/extension/transport"
+	internaltransport "github.com/larksuite/cli/internal/transport"
+	"github.com/larksuite/cli/internal/validate"
+)
+
+type opaqueRoundTripper struct {
+	called bool
+}
+
+func (t *opaqueRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
+	t.called = true
+	return &http.Response{StatusCode: http.StatusNoContent, Body: http.NoBody, Request: req}, nil
+}
+
+type downloadTestProvider struct {
+	interceptor exttransport.Interceptor
+}
+
+func (p downloadTestProvider) Name() string { return "download-test" }
+
+func (p downloadTestProvider) ResolveInterceptor(context.Context) exttransport.Interceptor {
+	return p.interceptor
+}
+
+type downloadHeaderInterceptor struct{}
+
+func (downloadHeaderInterceptor) PreRoundTrip(req *http.Request) func(*http.Response, error) {
+	req.Header.Set("X-Use-Proxy", "1")
+	return nil
+}
+
+func TestNewDownloadHTTPClientPreservesPolicyRouterBaseTransport(t *testing.T) {
+	wantErr := errors.New("proxy policy blocked request")
+	base := &http.Transport{
+		Proxy: func(*http.Request) (*url.URL, error) {
+			return nil, wantErr
+		},
+	}
+	router := internaltransport.NewHTTPPolicyRouter(base, base)
+	client := internaltransport.ClientForRequestClass(
+		&http.Client{Transport: router},
+		exttransport.RequestClassExternal,
+	)
+
+	download := validate.NewDownloadHTTPClient(client, validate.DownloadHTTPClientOptions{AllowHTTP: true})
+	req, err := http.NewRequest(http.MethodGet, "https://external.example/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := download.Transport.RoundTrip(req)
+	if resp != nil && resp.Body != nil {
+		resp.Body.Close()
+	}
+	if !errors.Is(err, wantErr) {
+		t.Fatalf("RoundTrip() error = %v, want preserved proxy error %v", err, wantErr)
+	}
+}
+
+func TestNewDownloadHTTPClientRejectsInitialHTTPBeforeTransport(t *testing.T) {
+	base := &opaqueRoundTripper{}
+	download := validate.NewDownloadHTTPClient(
+		&http.Client{Transport: base},
+		validate.DownloadHTTPClientOptions{},
+	)
+	req, err := http.NewRequest(http.MethodGet, "http://203.0.113.10/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = download.Transport.RoundTrip(req)
+	if err == nil {
+		t.Fatal("RoundTrip() error = nil, want initial HTTP rejection")
+	}
+	problem, ok := errs.ProblemOf(err)
+	if !ok || problem.Category != errs.CategoryPolicy || problem.Subtype != errs.SubtypeAccessDenied {
+		t.Fatalf("RoundTrip() problem = %#v, %v; want policy/access_denied", problem, ok)
+	}
+	if base.called {
+		t.Fatal("base transport was called for a disallowed initial HTTP request")
+	}
+}
+
+func TestNewDownloadHTTPClientAllowsSelectedLoopbackProxy(t *testing.T) {
+	proxy := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		if req.URL.Host != "203.0.113.10" {
+			t.Errorf("proxy request target = %q, want 203.0.113.10", req.URL.Host)
+		}
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(proxy.Close)
+	proxyURL, err := url.Parse(proxy.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	base := &http.Transport{Proxy: http.ProxyURL(proxyURL)}
+	router := internaltransport.NewHTTPPolicyRouter(base, base)
+	client := internaltransport.ClientForRequestClass(
+		&http.Client{Transport: router},
+		exttransport.RequestClassExternal,
+	)
+	download := validate.NewDownloadHTTPClient(client, validate.DownloadHTTPClientOptions{AllowHTTP: true})
+
+	req, err := http.NewRequest(http.MethodGet, "http://203.0.113.10/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := download.Do(req)
+	if err != nil {
+		t.Fatalf("download through selected loopback proxy: %v", err)
+	}
+	resp.Body.Close()
+}
+
+func TestNewDownloadHTTPClientSelectsProxyAfterOuterDecorators(t *testing.T) {
+	proxy := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		if got := req.Header.Get("X-Use-Proxy"); got != "1" {
+			t.Errorf("proxy received X-Use-Proxy = %q, want 1", got)
+		}
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(proxy.Close)
+	proxyURL, err := url.Parse(proxy.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	wantErr := errors.New("proxy selector ran before decorators")
+	base := &http.Transport{Proxy: func(req *http.Request) (*url.URL, error) {
+		if req.Header.Get("X-Use-Proxy") != "1" {
+			return nil, wantErr
+		}
+		return proxyURL, nil
+	}}
+	previousProvider := exttransport.GetProvider()
+	exttransport.Register(downloadTestProvider{interceptor: downloadHeaderInterceptor{}})
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+	router := internaltransport.NewHTTPPolicyRouter(base, base)
+	client := internaltransport.ClientForRequestClass(
+		&http.Client{Transport: router},
+		exttransport.RequestClassExternal,
+	)
+	download := validate.NewDownloadHTTPClient(client, validate.DownloadHTTPClientOptions{AllowHTTP: true})
+
+	req, err := http.NewRequest(http.MethodGet, "http://203.0.113.10/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := download.Do(req)
+	if err != nil {
+		t.Fatalf("download through decorator-selected proxy: %v", err)
+	}
+	resp.Body.Close()
+}
+
+func TestNewDownloadHTTPClientGuardsLegacyDialTLS(t *testing.T) {
+	server := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(server.Close)
+	base := &http.Transport{DialTLS: func(_, _ string) (net.Conn, error) {
+		return tls.Dial("tcp", server.Listener.Addr().String(), &tls.Config{InsecureSkipVerify: true}) //nolint:gosec // local TLS server verifies the connection guard.
+	}}
+	download := validate.NewDownloadHTTPClient(&http.Client{Transport: base}, validate.DownloadHTTPClientOptions{AllowHTTP: true})
+	req, err := http.NewRequest(http.MethodGet, "https://public.example/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = download.Transport.RoundTrip(req)
+	if err == nil || !strings.Contains(err.Error(), "local/internal host is not allowed") {
+		t.Fatalf("RoundTrip() error = %v, want legacy DialTLS IP guard", err)
+	}
+	problem, ok := errs.ProblemOf(err)
+	if !ok || problem.Category != errs.CategoryPolicy || problem.Subtype != errs.SubtypeAccessDenied {
+		t.Fatalf("RoundTrip() problem = %#v, %v; want policy/access_denied", problem, ok)
+	}
+	var policyErr *errs.SecurityPolicyError
+	if !errors.As(err, &policyErr) || policyErr.Cause == nil {
+		t.Fatalf("RoundTrip() error = %T, want policy error with cause", err)
+	}
+}
+
+func TestNewDownloadHTTPClientFailsClosedForOpaqueTransport(t *testing.T) {
+	opaque := &opaqueRoundTripper{}
+	client := internaltransport.ClientForRequestClass(
+		&http.Client{Transport: opaque},
+		exttransport.RequestClassExternal,
+	)
+	download := validate.NewDownloadHTTPClient(client, validate.DownloadHTTPClientOptions{AllowHTTP: true})
+	req, err := http.NewRequest(http.MethodGet, "https://public.example/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = download.Transport.RoundTrip(req)
+	if err == nil || !strings.Contains(err.Error(), "cannot safely clone download transport") {
+		t.Fatalf("RoundTrip() error = %v, want fail-closed clone error", err)
+	}
+	problem, ok := errs.ProblemOf(err)
+	if !ok || problem.Category != errs.CategoryInternal || problem.Subtype != errs.SubtypeUnknown {
+		t.Fatalf("RoundTrip() problem = %#v, %v; want internal/unknown", problem, ok)
+	}
+	if opaque.called {
+		t.Fatal("opaque transport was called after safe cloning failed")
+	}
+}