feat(enhancement): centralize HTTP transport policies (#2021)

* docs(base): clarify form and file operation routing

* docs: clarify complete base role table rules

* docs: clarify base advanced permission status

* docs: clarify base form field lifecycle

* docs: guide base form question creation

* fix(base): address form dry-run review findings

* docs(base): add complete editable role example

* fix(base): validate form question create inputs

.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 +2,119 @@
 
 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
+
+- introducing official card icon (#1973)
+- **apps**: validate +file-list --page-size against server (0, 200] range (#2007)
+- **apps**: support absolute and relative upload paths (#2005)
+- **slides**: fill xml-schema-quick-ref gaps that forced XSD fallback (#2026)
+- **slides**: add layout density lint for sparse/empty containers (#2022)
+- add risk-control protection (#1910)
+
+### Bug Fixes
+
+- **slides**: normalize presentation flag aliases (#2032)
+- **base**: classify +form-submit as high-risk-write (#1969)
+- **slides**: declare screenshot scope
+- **slides**: support CSV multi-value for --slide-id in screenshot (#2047)
+
+### Documentation
+
+- **skill**: clarify scope handling for query expansion (#2030)
+- **base**: clarify complete and partial updates (#1993)
+- **skills**: clarify callout child rules (#2048)
+
+### Misc
+
+- fix/task id handling (#2023)
+- fix/task search pagination (#2041)
+
 ## [v1.0.75] - 2026-07-22
 
 ### Features
@@ -1638,6 +1751,11 @@ 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
 [v1.0.73]: https://github.com/larksuite/cli/releases/tag/v1.0.73

README.md

@@ -285,12 +285,31 @@ To reduce these risks, the tool enables default security protections at multiple
 
 We recommend using the Lark/Feishu bot integrated with this tool as a private conversational assistant. Do not add it to group chats or allow other users to interact with it, to avoid abuse of permissions or data leakage.
 
+To reduce the security risks associated with access token theft, the CLI sends a minimal set of risk-control signals with OpenAPI requests made to exact official Feishu/Lark HTTPS domains. These signals are used to help identify anomalous API activity. This protection is enabled by default. The information sent is limited to:
+
+- Operating system type: macOS, Windows, or Linux
+- Device hardware model: for example, Mac17,9
+
+To disable this protection for the current workspace, run:
+
+```bash
+lark-cli config risk-control off
+```
+
+To enable this protection for the current workspace, run:
+
+```bash
+lark-cli config risk-control on
+```
+
+To restore the default policy for the current workspace, run:
+
+```bash
+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

@@ -286,12 +286,31 @@ lark-cli schema im.messages.delete
 
 我们建议您将对接本工具的飞书机器人作为私人对话助手使用，请勿将其拉入群聊或允许其他用户与其交互，以避免权限被滥用或数据泄露。
 
+为降低访问令牌被盗用后的安全风险，CLI 在向飞书/Lark 官方 HTTPS 精确域名发起 OpenAPI 请求时，会随请求发送一组最小化的风控信号，用于辅助识别异常调用行为。该保护默认开启，发送的信息仅包括：
+
+- 操作系统类型：macOS、Windows 或 Linux
+- 设备的硬件产品型号：例如 Mac17,9
+
+如需让当前 workspace 退出该保护，可执行以下命令：
+
+```bash
+lark-cli config risk-control off
+```
+
+如需开启当前 workspace 的保护，可执行以下命令：
+
+```bash
+lark-cli config risk-control on
+```
+
+恢复当前 workspace 默认策略可执行：
+
+```bash
+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/config/config.go

@@ -31,6 +31,7 @@ func NewCmdConfig(f *cmdutil.Factory) *cobra.Command {
 	cmd.AddCommand(NewCmdConfigShow(f, nil))
 	cmd.AddCommand(NewCmdConfigDefaultAs(f))
 	cmd.AddCommand(NewCmdConfigStrictMode(f))
+	cmd.AddCommand(NewCmdConfigRiskControl(f))
 	cmd.AddCommand(NewCmdConfigPolicy(f))
 	cmd.AddCommand(NewCmdConfigPlugins(f))
 	cmd.AddCommand(NewCmdConfigKeychainDowngrade(f))

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/risk_control.go

@@ -0,0 +1,80 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package config
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+
+	"github.com/larksuite/cli/errs"
+	"github.com/larksuite/cli/internal/cmdutil"
+	"github.com/larksuite/cli/internal/core"
+)
+
+// NewCmdConfigRiskControl creates the workspace risk-control policy command.
+func NewCmdConfigRiskControl(f *cmdutil.Factory) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "risk-control [on|off|default]",
+		Short: "Manage workspace account-protection policy",
+		Long: `View or set the account-protection risk-control policy for this workspace.
+
+Account protection is on by default. Use off to opt this workspace out, on to
+opt it back in explicitly, or default to remove the explicit preference.`,
+		Args: cobra.MaximumNArgs(1),
+		// This is persistent workspace policy, not credential management.
+		PersistentPreRunE: func(cmd *cobra.Command, _ []string) error {
+			cmd.SilenceUsage = true
+			return nil
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			config, err := core.LoadOrNotConfigured()
+			if err != nil {
+				return err
+			}
+			if len(args) == 0 {
+				printRiskControl(f, config)
+				return nil
+			}
+
+			switch args[0] {
+			case "on":
+				enabled := true
+				config.RiskControl = &enabled
+			case "off":
+				enabled := false
+				config.RiskControl = &enabled
+			case "default":
+				config.RiskControl = nil
+			default:
+				return errs.NewValidationError(errs.SubtypeInvalidArgument,
+					"invalid risk-control value %q, valid values: on | off | default", args[0])
+			}
+
+			if err := core.SaveMultiAppConfig(config); err != nil {
+				return errs.NewInternalError(errs.SubtypeStorage,
+					"failed to save risk-control policy: %v", err).WithCause(err)
+			}
+			fmt.Fprintf(f.IOStreams.ErrOut, "Risk control set to %s (workspace)\n", args[0])
+			return nil
+		},
+	}
+	cmdutil.SetRisk(cmd, cmdutil.RiskWrite)
+	return cmd
+}
+
+func printRiskControl(f *cmdutil.Factory, config *core.MultiAppConfig) {
+	source := "default"
+	if config.RiskControl != nil {
+		source = "workspace"
+	}
+	fmt.Fprintf(f.IOStreams.Out, "risk-control: %s (source: %s)\n", riskControlState(config.RiskControlEnabled()), source)
+}
+
+func riskControlState(enabled bool) string {
+	if enabled {
+		return "on"
+	}
+	return "off"
+}

cmd/config/risk_control_test.go

@@ -0,0 +1,130 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package config
+
+import (
+	"errors"
+	"strings"
+	"testing"
+
+	"github.com/larksuite/cli/errs"
+	"github.com/larksuite/cli/internal/cmdutil"
+	"github.com/larksuite/cli/internal/core"
+)
+
+func TestRiskControlWorkspacePolicy(t *testing.T) {
+	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
+	config := &core.MultiAppConfig{Apps: []core.AppConfig{{
+		AppId: "cli_test", AppSecret: core.PlainSecret("secret"), Brand: core.BrandFeishu,
+	}}}
+	if err := core.SaveMultiAppConfig(config); err != nil {
+		t.Fatal(err)
+	}
+
+	f, stdout, stderr, _ := cmdutil.TestFactory(t, nil)
+	cmd := NewCmdConfigRiskControl(f)
+	cmd.SetArgs([]string{"off"})
+	if err := cmd.Execute(); err != nil {
+		t.Fatalf("set off: %v", err)
+	}
+	loaded, err := core.LoadMultiAppConfig()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if loaded.RiskControl == nil || *loaded.RiskControl {
+		t.Fatalf("RiskControl = %v, want explicit false", loaded.RiskControl)
+	}
+	if !strings.Contains(stderr.String(), "set to off") {
+		t.Fatalf("stderr = %q", stderr.String())
+	}
+
+	stdout.Reset()
+	cmd = NewCmdConfigRiskControl(f)
+	if err := cmd.Execute(); err != nil {
+		t.Fatalf("show: %v", err)
+	}
+	if got := stdout.String(); got != "risk-control: off (source: workspace)\n" {
+		t.Fatalf("stdout = %q", got)
+	}
+
+	cmd = NewCmdConfigRiskControl(f)
+	cmd.SetArgs([]string{"on"})
+	if err := cmd.Execute(); err != nil {
+		t.Fatalf("set on: %v", err)
+	}
+	loaded, err = core.LoadMultiAppConfig()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if loaded.RiskControl == nil || !*loaded.RiskControl {
+		t.Fatalf("RiskControl = %v, want explicit true", loaded.RiskControl)
+	}
+
+	cmd = NewCmdConfigRiskControl(f)
+	cmd.SetArgs([]string{"default"})
+	if err := cmd.Execute(); err != nil {
+		t.Fatalf("reset default: %v", err)
+	}
+	loaded, err = core.LoadMultiAppConfig()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if loaded.RiskControl != nil {
+		t.Fatalf("RiskControl = %v, want nil", loaded.RiskControl)
+	}
+
+	stdout.Reset()
+	cmd = NewCmdConfigRiskControl(f)
+	if err := cmd.Execute(); err != nil {
+		t.Fatalf("show default: %v", err)
+	}
+	if got := stdout.String(); got != "risk-control: on (source: default)\n" {
+		t.Fatalf("stdout = %q", got)
+	}
+}
+
+func TestRiskControlWorkspacePolicyRejectsInvalidValue(t *testing.T) {
+	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
+	if err := core.SaveMultiAppConfig(&core.MultiAppConfig{Apps: []core.AppConfig{{
+		AppId: "cli_test", AppSecret: core.PlainSecret("secret"), Brand: core.BrandFeishu,
+	}}}); err != nil {
+		t.Fatal(err)
+	}
+
+	f, _, _, _ := cmdutil.TestFactory(t, nil)
+	cmd := NewCmdConfigRiskControl(f)
+	cmd.SetArgs([]string{"invalid"})
+	err := cmd.Execute()
+	var validationErr *errs.ValidationError
+	if !errors.As(err, &validationErr) {
+		t.Fatalf("error = %T %v, want *errs.ValidationError", err, err)
+	}
+	if validationErr.Subtype != errs.SubtypeInvalidArgument {
+		t.Fatalf("subtype = %q, want %q", validationErr.Subtype, errs.SubtypeInvalidArgument)
+	}
+}
+
+func TestRiskControlWorkspacePolicyAllowedWithExternalCredentials(t *testing.T) {
+	f := newConfigFactoryWithExternalProvider(t)
+	config := &core.MultiAppConfig{Apps: []core.AppConfig{{
+		AppId: "cli_test", AppSecret: core.PlainSecret("secret"), Brand: core.BrandFeishu,
+	}}}
+	if err := core.SaveMultiAppConfig(config); err != nil {
+		t.Fatal(err)
+	}
+
+	cmd := NewCmdConfig(f)
+	cmd.SetArgs([]string{"risk-control", "off"})
+	if err := cmd.Execute(); err != nil {
+		t.Fatalf("set off with external credentials: %v", err)
+	}
+
+	loaded, err := core.LoadMultiAppConfig()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if loaded.RiskControl == nil || *loaded.RiskControl {
+		t.Fatalf("RiskControl = %v, want explicit false", loaded.RiskControl)
+	}
+}

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/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)
 			}

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

@@ -518,6 +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{}

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.
@@ -31,7 +33,7 @@ type InvocationContext struct {
 
 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
 
@@ -48,6 +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"
@@ -22,6 +24,7 @@ import (
 	"github.com/larksuite/cli/internal/credential"
 	"github.com/larksuite/cli/internal/keychain"
 	"github.com/larksuite/cli/internal/registry"
+	"github.com/larksuite/cli/internal/riskcontrol"
 	_ "github.com/larksuite/cli/internal/security/contentsafety" // register content safety provider
 	"github.com/larksuite/cli/internal/transport"
 	_ "github.com/larksuite/cli/internal/vfs/localfileio" // register default FileIO provider
@@ -33,7 +36,7 @@ import (
 //	Phase 1: HttpClient (no credential dependency)
 //	Phase 2: Credential (sole data source for account info)
 //	Phase 3: Config derived from Credential
-//	Phase 4: LarkClient derived from Credential
+//	Phase 4: LarkClient derived from Credential and workspace policy
 func NewDefault(streams *IOStreams, inv InvocationContext) *Factory {
 	streams = normalizeStreams(streams)
 	f := &Factory{
@@ -47,6 +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.
@@ -56,7 +72,7 @@ func NewDefault(streams *IOStreams, inv InvocationContext) *Factory {
 	f.FileIOProvider = fileio.GetProvider()
 
 	// Phase 1: HttpClient (no credential dependency)
-	f.HttpClient = cachedHttpClientFunc(f)
+	f.HttpClient = cachedHttpClientFunc(f, workspaceConfig)
 
 	// Phase 2: Credential (sole data source)
 	// Keychain is read via closure so callers can replace f.Keychain after construction.
@@ -67,7 +83,7 @@ func NewDefault(streams *IOStreams, inv InvocationContext) *Factory {
 		ErrOut:     f.IOStreams.ErrOut,
 	})
 
-	// Phase 3: Config derived from Credential via an explicit conversion boundary.
+	// Phase 3: Runtime config contains resolved account data only.
 	f.Config = sync.OnceValues(func() (*core.CliConfig, error) {
 		acct, err := f.Credential.ResolveAccount(context.Background())
 		if err != nil {
@@ -78,21 +94,52 @@ func NewDefault(streams *IOStreams, inv InvocationContext) *Factory {
 		return cfg, nil
 	})
 
-	// Phase 4: LarkClient from Credential (placeholder AppSecret)
-	f.LarkClient = cachedLarkClientFunc(f)
+	// Phase 4: LarkClient composes account data and workspace policy at the SDK
+	// transport boundary.
+	f.LarkClient = cachedLarkClientFunc(f, workspaceConfig)
 
 	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")
@@ -100,6 +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
@@ -108,19 +178,19 @@ func safeRedirectPolicy(req *http.Request, via []*http.Request) error {
 // .StderrIsTerminal field, which tests set directly.
 var warnIfProxied = transport.WarnIfProxied
 
-func cachedHttpClientFunc(f *Factory) func() (*http.Client, error) {
+func cachedHttpClientFunc(f *Factory, workspaceConfig workspaceConfigSource) func() (*http.Client, error) {
 	return sync.OnceValues(func() (*http.Client, error) {
 		if f.IOStreams.StderrIsTerminal {
 			warnIfProxied(f.IOStreams.ErrOut)
 		}
 
-		var rt http.RoundTripper = transport.Shared()
-		rt = &RetryTransport{Base: rt}
-		rt = &SecurityHeaderTransport{Base: rt}
-		rt = &auth.SecurityPolicyTransport{Base: rt} // Add our global response interceptor
-		rt = wrapWithExtension(rt)
+		hostSignalSource := resolveSDKHostSignalSource(workspaceConfig)
+		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,
 		}
@@ -128,7 +198,16 @@ func cachedHttpClientFunc(f *Factory) func() (*http.Client, error) {
 	})
 }
 
-func cachedLarkClientFunc(f *Factory) func() (*lark.Client, error) {
+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())
 		if err != nil {
@@ -142,8 +221,9 @@ func cachedLarkClientFunc(f *Factory) func() (*lark.Client, error) {
 		if f.IOStreams.StderrIsTerminal {
 			warnIfProxied(f.IOStreams.ErrOut)
 		}
+		hostSignalSource := resolveSDKHostSignalSource(workspaceConfig)
 		opts = append(opts, lark.WithHttpClient(&http.Client{
-			Transport:     buildSDKTransport(),
+			Transport:     buildSDKTransport(hostSignalSource),
 			CheckRedirect: safeRedirectPolicy,
 		}))
 		ep := core.ResolveEndpoints(acct.Brand)
@@ -152,13 +232,41 @@ func cachedLarkClientFunc(f *Factory) func() (*lark.Client, error) {
 	})
 }
 
-func buildSDKTransport() http.RoundTripper {
-	var sdkTransport http.RoundTripper = transport.Shared()
-	sdkTransport = &RetryTransport{Base: sdkTransport}
-	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 {

internal/cmdutil/factory_http_test.go

@@ -4,12 +4,24 @@
 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) {
-	fn := cachedHttpClientFunc(&Factory{IOStreams: &IOStreams{ErrOut: io.Discard}})
+func TestCachedHTTPClientFunc_ReturnsSameInstance(t *testing.T) {
+	isEnabled := false
+	f, _, _, _ := TestFactory(t, &core.CliConfig{AppID: "test-app"})
+	f.IOStreams.ErrOut = io.Discard
+	fn := cachedHttpClientFunc(f, staticWorkspaceConfig{config: &core.MultiAppConfig{RiskControl: &isEnabled}})
 
 	c1, err := fn()
 	if err != nil {
@@ -28,18 +40,304 @@ func TestCachedHttpClientFunc_ReturnsSameInstance(t *testing.T) {
 	}
 }
 
-func TestCachedHttpClientFunc_HasTimeout(t *testing.T) {
-	fn := cachedHttpClientFunc(&Factory{IOStreams: &IOStreams{ErrOut: io.Discard}})
+func TestCachedHTTPClientFunc_HasTimeout(t *testing.T) {
+	isEnabled := false
+	f, _, _, _ := TestFactory(t, &core.CliConfig{AppID: "test-app"})
+	f.IOStreams.ErrOut = io.Discard
+	fn := cachedHttpClientFunc(f, staticWorkspaceConfig{config: &core.MultiAppConfig{RiskControl: &isEnabled}})
 	c, _ := fn()
 	if c.Timeout == 0 {
 		t.Error("expected non-zero timeout")
 	}
 }
 
-func TestCachedHttpClientFunc_HasRedirectPolicy(t *testing.T) {
-	fn := cachedHttpClientFunc(&Factory{IOStreams: &IOStreams{ErrOut: io.Discard}})
+func TestCachedHTTPClientFunc_HasRedirectPolicy(t *testing.T) {
+	isEnabled := false
+	f, _, _, _ := TestFactory(t, &core.CliConfig{AppID: "test-app"})
+	f.IOStreams.ErrOut = io.Discard
+	fn := cachedHttpClientFunc(f, staticWorkspaceConfig{config: &core.MultiAppConfig{RiskControl: &isEnabled}})
 	c, _ := fn()
 	if c.CheckRedirect == nil {
 		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

@@ -8,6 +8,7 @@ import (
 	"testing"
 
 	_ "github.com/larksuite/cli/extension/credential/env" // registers the env-backed account provider
+	"github.com/larksuite/cli/internal/core"
 	"github.com/larksuite/cli/internal/envvars"
 )
 
@@ -33,16 +34,18 @@ 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) {
 			calls := installProxyWarnSpy(t)
 
-			fn := cachedHttpClientFunc(&Factory{IOStreams: &IOStreams{
-				ErrOut: io.Discard, StderrIsTerminal: tc.terminal,
-			}})
+			f, _, _, _ := TestFactory(t, &core.CliConfig{AppID: "test-app"})
+			f.IOStreams.ErrOut = io.Discard
+			f.IOStreams.StderrIsTerminal = tc.terminal
+			fn := cachedHttpClientFunc(f, staticWorkspaceConfig{config: &core.MultiAppConfig{RiskControl: &isEnabled}})
 			if _, err := fn(); err != nil {
 				t.Fatalf("http client init: %v", err)
 			}
@@ -73,7 +76,7 @@ func TestCachedLarkClientFunc_ProxyWarnGate(t *testing.T) {
 			// normalizeStreams copies the struct (out := *s), so the
 			// StderrIsTerminal field survives into f.IOStreams.
 			f := NewDefault(&IOStreams{ErrOut: io.Discard, StderrIsTerminal: tc.terminal}, InvocationContext{})
-			if _, err := cachedLarkClientFunc(f)(); err != nil {
+			if _, err := cachedLarkClientFunc(f, nil)(); err != nil {
 				t.Fatalf("lark client init: %v", err)
 			}
 

internal/cmdutil/localfile.go

@@ -0,0 +1,36 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package cmdutil
+
+import (
+	"io/fs"
+
+	"github.com/larksuite/cli/extension/fileio"
+	"github.com/larksuite/cli/internal/validate"
+	"github.com/larksuite/cli/internal/vfs"
+)
+
+// StatLocalFile returns metadata for a path in the process filesystem namespace.
+// It is intended for advisory validation; callers must validate the opened file
+// again before using its contents.
+func StatLocalFile(path string) (fs.FileInfo, error) {
+	localPath, err := validate.LocalInputPath(path)
+	if err != nil {
+		return nil, &fileio.PathValidationError{Err: err}
+	}
+	return vfs.Stat(localPath)
+}
+
+// OpenLocalFile opens a path in the process filesystem namespace.
+// Absolute and relative paths are accepted. It is the shared replacement for
+// direct os.Open/os.ReadFile use in commands that intentionally read local
+// paths outside the workspace sandbox. Callers inspect the returned descriptor
+// before reading so validation and use apply to the same opened file.
+func OpenLocalFile(path string) (fs.File, error) {
+	localPath, err := validate.LocalInputPath(path)
+	if err != nil {
+		return nil, &fileio.PathValidationError{Err: err}
+	}
+	return vfs.Open(localPath)
+}

internal/cmdutil/localfile_test.go

@@ -0,0 +1,96 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package cmdutil
+
+import (
+	"errors"
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/larksuite/cli/extension/fileio"
+	"github.com/larksuite/cli/internal/vfs"
+)
+
+func TestOpenLocalFile_AcceptsAbsoluteAndParentRelativePaths(t *testing.T) {
+	root := t.TempDir()
+	workDir := filepath.Join(root, "work")
+	if err := os.Mkdir(workDir, 0o755); err != nil {
+		t.Fatal(err)
+	}
+	path := filepath.Join(root, "input.txt")
+	if err := os.WriteFile(path, []byte("content"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	TestChdir(t, workDir)
+
+	for _, input := range []string{path, filepath.Join("..", "input.txt")} {
+		f, err := OpenLocalFile(input)
+		if err != nil {
+			t.Fatalf("OpenLocalFile(%q) error = %v", input, err)
+		}
+		got, readErr := io.ReadAll(f)
+		closeErr := f.Close()
+		if readErr != nil || closeErr != nil || string(got) != "content" {
+			t.Fatalf("OpenLocalFile(%q) content=%q read=%v close=%v", input, got, readErr, closeErr)
+		}
+	}
+}
+
+func TestOpenLocalFile_RejectsInvalidInput(t *testing.T) {
+	if _, err := OpenLocalFile("input\n.txt"); !errors.Is(err, fileio.ErrPathValidation) {
+		t.Fatalf("OpenLocalFile() error = %v, want ErrPathValidation", err)
+	}
+}
+
+func TestStatLocalFile_ReturnsMetadata(t *testing.T) {
+	info, err := StatLocalFile(t.TempDir())
+	if err != nil {
+		t.Fatalf("StatLocalFile() error = %v", err)
+	}
+	if !info.IsDir() {
+		t.Fatalf("StatLocalFile() mode = %v, want directory", info.Mode())
+	}
+}
+
+func TestOpenLocalFile_DoesNotStatBeforeOpen(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "input.txt")
+	if err := os.WriteFile(path, []byte("content"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+
+	previous := vfs.DefaultFS
+	counting := &countingLocalFileFS{FS: previous}
+	vfs.DefaultFS = counting
+	t.Cleanup(func() { vfs.DefaultFS = previous })
+
+	f, err := OpenLocalFile(path)
+	if err != nil {
+		t.Fatalf("OpenLocalFile() error = %v", err)
+	}
+	if err := f.Close(); err != nil {
+		t.Fatal(err)
+	}
+	if counting.openCalls != 1 || counting.statCalls != 0 {
+		t.Fatalf("OpenLocalFile() calls: Open=%d Stat=%d, want Open=1 Stat=0", counting.openCalls, counting.statCalls)
+	}
+}
+
+type countingLocalFileFS struct {
+	vfs.FS
+	openCalls int
+	statCalls int
+}
+
+func (f *countingLocalFileFS) Open(name string) (*os.File, error) {
+	f.openCalls++
+	return f.FS.Open(name)
+}
+
+func (f *countingLocalFileFS) Stat(name string) (fs.FileInfo, error) {
+	f.statCalls++
+	return f.FS.Stat(name)
+}

internal/cmdutil/risk_control.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package cmdutil
+
+import (
+	"github.com/larksuite/cli/internal/core"
+	"github.com/larksuite/cli/internal/riskcontrol"
+)
+
+type workspaceConfigSource interface {
+	MultiAppConfig() (*core.MultiAppConfig, error)
+}
+
+// resolveSDKHostSignalSource applies workspace policy at the SDK transport
+// boundary.
+func resolveSDKHostSignalSource(config workspaceConfigSource) riskcontrol.Source {
+	if config == nil {
+		return nil
+	}
+	workspace, configErr := config.MultiAppConfig()
+	// Default-on means an existing config with no explicit preference. Absent
+	// or unreadable config cannot authorize host-signal collection.
+	if configErr != nil || !workspace.RiskControlEnabled() {
+		return nil
+	}
+	return riskcontrol.NewHostSource()
+}

internal/cmdutil/risk_control_test.go

@@ -0,0 +1,45 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package cmdutil
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/larksuite/cli/internal/core"
+)
+
+type staticWorkspaceConfig struct {
+	config *core.MultiAppConfig
+	err    error
+}
+
+func (s staticWorkspaceConfig) MultiAppConfig() (*core.MultiAppConfig, error) {
+	return s.config, s.err
+}
+
+func TestResolveSDKHostSignalSource(t *testing.T) {
+	disabled := false
+	tests := []struct {
+		name       string
+		config     workspaceConfigSource
+		wantSource bool
+	}{
+		{name: "workspace default on", config: staticWorkspaceConfig{config: &core.MultiAppConfig{}}, wantSource: true},
+		{name: "workspace opt-out", config: staticWorkspaceConfig{config: &core.MultiAppConfig{RiskControl: &disabled}}},
+		{name: "missing config", config: staticWorkspaceConfig{err: errors.New("file does not exist")}},
+		{name: "unreadable config", config: staticWorkspaceConfig{err: errors.New("permission denied")}},
+		{name: "nil config value", config: staticWorkspaceConfig{}},
+		{name: "nil config source"},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			got := resolveSDKHostSignalSource(test.config)
+			if (got != nil) != test.wantSource {
+				t.Fatalf("resolveSDKHostSignalSource() = %T, wantSource %t", got, test.wantSource)
+			}
+		})
+	}
+}

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

@@ -14,7 +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)
@@ -90,79 +91,107 @@ func TestRetryTransport_DefaultNoRetry(t *testing.T) {
 	}
 }
 
-// ---------------------------------------------------------------------------
-// buildSDKTransport chain composition
+// buildSDKTransport policy behavior
 // ---------------------------------------------------------------------------
 
-func TestBuildSDKTransport_IncludesRetryTransport(t *testing.T) {
-	transport := buildSDKTransport()
+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 → 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)
-	}
-	if _, ok := ua.Base.(*RetryTransport); !ok {
-		t.Fatalf("inner transport type = %T, want *RetryTransport", ua.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 TestBuildSDKTransport_WithExtension(t *testing.T) {
-	exttransport.Register(&stubTransportProvider{})
-	t.Cleanup(func() { exttransport.Register(nil) })
+	previous := exttransport.GetProvider()
+	interceptor := &headerCapturingInterceptor{}
+	exttransport.Register(&platformOnlyStubProvider{
+		stubTransportProvider: &stubTransportProvider{interceptor: interceptor},
+	})
+	t.Cleanup(func() { exttransport.Register(previous) })
 
-	transport := buildSDKTransport()
+	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 → 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)
-	}
-	if _, ok := ua.Base.(*RetryTransport); !ok {
-		t.Fatalf("innermost transport type = %T, want *RetryTransport", ua.Base)
+	resp.Body.Close()
+	if !interceptor.preCalled || !interceptor.postCalled {
+		t.Fatal("SDK platform request did not execute extension pre/post hooks")
 	}
 }
 
 func TestBuildSDKTransport_WithoutExtension(t *testing.T) {
+	previous := exttransport.GetProvider()
 	exttransport.Register(nil)
+	t.Cleanup(func() { exttransport.Register(previous) })
 
-	transport := buildSDKTransport()
+	if _, ok := buildSDKTransport(nil).(*internaltransport.HTTPPolicyRouter); !ok {
+		t.Fatalf(
+			"buildSDKTransport() type = %T, want *transport.HTTPPolicyRouter",
+			buildSDKTransport(nil),
+		)
+	}
+}
 
-	// Chain: SecurityPolicy → BuildHeader → UserAgent → Retry → 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)
-	}
-	if _, ok := ua.Base.(*RetryTransport); !ok {
-		t.Fatalf("inner transport type = %T, want *RetryTransport", ua.Base)
+	if concrete == base {
+		t.Fatal("SDK policy graph reused the original HTTP transport")
 	}
 }
 
@@ -222,7 +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)
@@ -250,26 +279,132 @@ 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
 }
 
+type riskHeaderTamperingInterceptor struct{}
+
+func (riskHeaderTamperingInterceptor) PreRoundTrip(req *http.Request) func(*http.Response, error) {
+	req.Header.Set(riskcontrol.HeaderOSType, "extension-value")
+	req.Header.Set(riskcontrol.HeaderProductModel, "extension-value")
+	return nil
+}
+
+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) })
+
+	var received http.Header
+	network := roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		received = req.Header.Clone()
+		return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}, nil
+	})
+	req, err := http.NewRequest(http.MethodGet, "https://open.feishu.cn/open-apis/test", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	req.Header.Set("Authorization", "Bearer token")
+
+	client := internaltransport.ClientForRequestClass(
+		&http.Client{Transport: buildSDKTransportWithBase(network, nil)},
+		exttransport.RequestClassPlatform,
+	)
+	resp, err := client.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+	if received.Get(riskcontrol.HeaderOSType) != "" || received.Get(riskcontrol.HeaderProductModel) != "" {
+		t.Fatalf("extension risk headers reached network: %v", received)
+	}
+}
+
 // 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()
@@ -277,12 +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 buildSDKTransport.
+	// 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)
@@ -299,6 +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
@@ -388,7 +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)
@@ -450,7 +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)
 
@@ -491,7 +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)
 
@@ -510,7 +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

@@ -60,11 +60,18 @@ func (a *AppConfig) ProfileName() string {
 // MultiAppConfig is the multi-app config file format.
 type MultiAppConfig struct {
 	StrictMode  StrictMode  `json:"strictMode,omitempty"`
+	RiskControl *bool       `json:"riskControl,omitempty"`
 	CurrentApp  string      `json:"currentApp,omitempty"`
 	PreviousApp string      `json:"previousApp,omitempty"`
 	Apps        []AppConfig `json:"apps"`
 }
 
+// RiskControlEnabled resolves the workspace policy. An omitted preference
+// keeps the default-on account-protection behavior.
+func (m *MultiAppConfig) RiskControlEnabled() bool {
+	return m != nil && (m.RiskControl == nil || *m.RiskControl)
+}
+
 // CurrentAppConfig returns the currently active app config.
 // Resolution priority: profileOverride > CurrentApp field > Apps[0].
 func (m *MultiAppConfig) CurrentAppConfig(profileOverride string) *AppConfig {

internal/core/config_snapshot.go

@@ -0,0 +1,37 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package core
+
+import (
+	"io/fs"
+	"sync"
+)
+
+// ConfigSnapshot lazily captures one stable view of config.json for a CLI
+// invocation. All runtime consumers share the same load result so account and
+// workspace policy resolution cannot observe different file revisions. Callers
+// must treat the returned config as read-only.
+type ConfigSnapshot struct {
+	load func() (*MultiAppConfig, error)
+}
+
+// NewConfigSnapshot creates a lazily loaded invocation-scoped config snapshot.
+func NewConfigSnapshot() *ConfigSnapshot {
+	return newConfigSnapshot(LoadMultiAppConfig)
+}
+
+func newConfigSnapshot(load func() (*MultiAppConfig, error)) *ConfigSnapshot {
+	if load == nil {
+		return &ConfigSnapshot{}
+	}
+	return &ConfigSnapshot{load: sync.OnceValues(load)}
+}
+
+// MultiAppConfig returns the captured persistent config and load error.
+func (s *ConfigSnapshot) MultiAppConfig() (*MultiAppConfig, error) {
+	if s == nil || s.load == nil {
+		return nil, fs.ErrNotExist
+	}
+	return s.load()
+}

internal/core/config_snapshot_test.go

@@ -0,0 +1,58 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package core
+
+import (
+	"errors"
+	"io/fs"
+	"testing"
+)
+
+func TestConfigSnapshotLoadsOnce(t *testing.T) {
+	calls := 0
+	want := &MultiAppConfig{}
+	snapshot := newConfigSnapshot(func() (*MultiAppConfig, error) {
+		calls++
+		return want, nil
+	})
+
+	for range 2 {
+		config, err := snapshot.MultiAppConfig()
+		if err != nil {
+			t.Fatal(err)
+		}
+		if config != want {
+			t.Fatal("snapshot returned a different config instance")
+		}
+	}
+	if calls != 1 {
+		t.Fatalf("config loads = %d, want 1", calls)
+	}
+}
+
+func TestConfigSnapshotZeroValueIsMissing(t *testing.T) {
+	config, err := (&ConfigSnapshot{}).MultiAppConfig()
+	if config != nil || !errors.Is(err, fs.ErrNotExist) {
+		t.Fatalf("MultiAppConfig() = (%v, %v), want (nil, fs.ErrNotExist)", config, err)
+	}
+}
+
+func TestConfigSnapshotCachesError(t *testing.T) {
+	calls := 0
+	want := errors.New("load failed")
+	snapshot := newConfigSnapshot(func() (*MultiAppConfig, error) {
+		calls++
+		return nil, want
+	})
+
+	for range 2 {
+		config, err := snapshot.MultiAppConfig()
+		if config != nil || !errors.Is(err, want) {
+			t.Fatalf("MultiAppConfig() = (%v, %v), want (nil, %v)", config, err, want)
+		}
+	}
+	if calls != 1 {
+		t.Fatalf("config loads = %d, want 1", calls)
+	}
+}

internal/core/config_test.go

@@ -60,7 +60,9 @@ func TestAppConfig_LangOmitEmpty(t *testing.T) {
 }
 
 func TestMultiAppConfig_RoundTrip(t *testing.T) {
+	disabled := false
 	config := &MultiAppConfig{
+		RiskControl: &disabled,
 		Apps: []AppConfig{{
 			AppId: "cli_test", AppSecret: PlainSecret("s"),
 			Brand: BrandLark, Lang: "zh", Users: []AppUser{},
@@ -84,6 +86,9 @@ func TestMultiAppConfig_RoundTrip(t *testing.T) {
 	if got.Apps[0].Brand != BrandLark {
 		t.Errorf("Brand = %q, want %q", got.Apps[0].Brand, BrandLark)
 	}
+	if got.RiskControl == nil || *got.RiskControl {
+		t.Errorf("RiskControl = %v, want explicit false", got.RiskControl)
+	}
 }
 
 func TestResolveConfigFromMulti_RejectsSecretKeyMismatch(t *testing.T) {

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/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/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/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/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/osmodel.go

@@ -0,0 +1,142 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+// Package deviceinfo collects the platform hardware product model and the
+// platform values used by device-related risk-control headers.
+package riskcontrol
+
+import (
+	"runtime"
+	"strings"
+	"sync"
+	"unicode"
+	"unicode/utf8"
+
+	"golang.org/x/net/http/httpguts"
+)
+
+// OSType is the server-side risk-control operating-system enum.
+type OSType string
+
+// OS type enum values for X-Agent-Os-Type.
+const (
+	OSTypeUnknown = "0"
+	OSTypeWindows = "1"
+	OSTypeLinux   = "2"
+	OSTypeMacOS   = "3"
+)
+
+const (
+	// TerminalTypePC is the fixed X-Agent-Terminal-Type value for the CLI.
+	TerminalTypePC = "1"
+
+	// Unknown is used when the hardware product model cannot be collected.
+	Unknown = "Unknown"
+
+	// deviceModelMaxBytes bounds the value added to X-Agent-Device-Type.
+	// Device models are short identifiers; a larger value is treated as
+	// malformed rather than truncated so the header never misrepresents it.
+	deviceModelMaxBytes = 256
+)
+
+// Snapshot contains the deliberately small risk-control signal set.
+// ProductModel is omitted when the platform cannot provide a safe value.
+type Snapshot struct {
+	OSType       OSType
+	ProductModel string
+}
+
+// Source supplies one immutable process-level snapshot.
+type Source interface {
+	Snapshot() Snapshot
+}
+
+// HostSource lazily reads host signals once, after outbound policy authorizes
+// the first request. Failed probes are cached and are not retried per request.
+type HostSource struct {
+	once      sync.Once
+	value     Snapshot
+	readModel func() string
+}
+
+// NewHostSource creates the production host signal source.
+func NewHostSource() *HostSource {
+	return &HostSource{readModel: readDeviceModel}
+}
+
+// Snapshot returns the cached host signal snapshot.
+func (s *HostSource) Snapshot() Snapshot {
+	if s == nil {
+		return Snapshot{}
+	}
+	s.once.Do(func() {
+		readModel := s.readModel
+		if readModel == nil {
+			readModel = readDeviceModel
+		}
+		s.value = Snapshot{
+			OSType:       GetOSType(OSName()),
+			ProductModel: normalizeDeviceModel(readModel()),
+		}
+	})
+	return s.value
+}
+
+// normalizeModel removes non-printable characters and returns a model only
+// when the remaining text is safe to use as an HTTP header value. Input that
+// cannot produce a valid model is rejected so Get can fall back to Unknown.
+func normalizeDeviceModel(model string) string {
+	if !utf8.ValidString(model) {
+		return ""
+	}
+	model = strings.Map(func(r rune) rune {
+		switch {
+		case r == '\r' || r == '\n' || r == '\x00':
+			return -1
+		case unicode.IsSpace(r):
+			return ' '
+		case unicode.IsPrint(r):
+			return r
+		default:
+			return -1
+		}
+	}, model)
+
+	model = strings.Join(strings.Fields(model), " ")
+
+	if model == "" || len(model) > deviceModelMaxBytes {
+		return ""
+	}
+	if !httpguts.ValidHeaderFieldValue(model) {
+		return ""
+	}
+	return model
+}
+
+// GetOSType maps a platform name to the X-Agent-Os-Type enum.
+func GetOSType(osName string) OSType {
+	switch osName {
+	case "Windows":
+		return OSTypeWindows
+	case "Linux":
+		return OSTypeLinux
+	case "MacOS":
+		return OSTypeMacOS
+	default:
+		return OSTypeUnknown
+	}
+}
+
+// OSName returns the platform name used by GetOSType.
+func OSName() string {
+	switch runtime.GOOS {
+	case "darwin":
+		return "MacOS"
+	case "windows":
+		return "Windows"
+	case "linux":
+		return "Linux"
+	default:
+		return runtime.GOOS
+	}
+}

internal/riskcontrol/osmodel_darwin.go

@@ -0,0 +1,27 @@
+//go:build darwin
+
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package riskcontrol
+
+import "golang.org/x/sys/unix"
+
+// readDeviceModel reads the current product key first and falls back to the
+// legacy model key. Trying both keys is more robust than branching on a macOS
+// version because virtualized or restricted environments may expose only one.
+func readDeviceModel() string {
+	return readDarwinDeviceModel(unix.Sysctl)
+}
+
+func readDarwinDeviceModel(readSysctl func(string) (string, error)) string {
+	for _, key := range [...]string{"hw.product", "hw.model"} {
+		model, err := readSysctl(key)
+		if err == nil {
+			if model = normalizeDeviceModel(model); model != "" {
+				return model
+			}
+		}
+	}
+	return ""
+}

internal/riskcontrol/osmodel_darwin_test.go

@@ -0,0 +1,48 @@
+//go:build darwin
+
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package riskcontrol
+
+import (
+	"errors"
+	"reflect"
+	"testing"
+)
+
+func TestReadDarwinDeviceModelPrefersProductAndFallsBackToModel(t *testing.T) {
+	t.Run("product available", func(t *testing.T) {
+		var keys []string
+		got := readDarwinDeviceModel(func(key string) (string, error) {
+			keys = append(keys, key)
+			if key == "hw.product" {
+				return "Mac16,1", nil
+			}
+			return "", errors.New("unexpected fallback")
+		})
+		if got != "Mac16,1" {
+			t.Fatalf("model = %q, want %q", got, "Mac16,1")
+		}
+		if want := []string{"hw.product"}; !reflect.DeepEqual(keys, want) {
+			t.Fatalf("sysctl keys = %v, want %v", keys, want)
+		}
+	})
+
+	t.Run("product unavailable", func(t *testing.T) {
+		var keys []string
+		got := readDarwinDeviceModel(func(key string) (string, error) {
+			keys = append(keys, key)
+			if key == "hw.model" {
+				return "MacBookPro18,3", nil
+			}
+			return "", errors.New("not available")
+		})
+		if got != "MacBookPro18,3" {
+			t.Fatalf("model = %q, want %q", got, "MacBookPro18,3")
+		}
+		if want := []string{"hw.product", "hw.model"}; !reflect.DeepEqual(keys, want) {
+			t.Fatalf("sysctl keys = %v, want %v", keys, want)
+		}
+	})
+}

internal/riskcontrol/osmodel_linux.go

@@ -0,0 +1,17 @@
+//go:build linux
+
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package riskcontrol
+
+// readDeviceModel returns a stable device model for Linux. DMI and device-tree
+// values vary widely and can expose the host or virtualization platform when
+// the CLI runs in a container or sandbox.
+func readDeviceModel() string {
+	return readLinuxDeviceModel()
+}
+
+func readLinuxDeviceModel() string {
+	return "linux"
+}

internal/riskcontrol/osmodel_linux_test.go

@@ -0,0 +1,20 @@
+//go:build linux
+
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package riskcontrol
+
+import "testing"
+
+func TestReadDeviceModelReturnsLinux(t *testing.T) {
+	if got := readDeviceModel(); got != "linux" {
+		t.Fatalf("readDeviceModel() = %q, want %q", got, "linux")
+	}
+}
+
+func TestReadLinuxDeviceModel(t *testing.T) {
+	if got := readLinuxDeviceModel(); got != "linux" {
+		t.Fatalf("readLinuxDeviceModel() = %q, want %q", got, "linux")
+	}
+}

internal/riskcontrol/osmodel_other.go

@@ -0,0 +1,11 @@
+//go:build !darwin && !windows && !linux
+
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package riskcontrol
+
+// readDeviceModel returns an empty model on unsupported platforms.
+func readDeviceModel() string {
+	return ""
+}

internal/riskcontrol/osmodel_test.go

@@ -0,0 +1,143 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package riskcontrol
+
+import (
+	"fmt"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"unicode"
+)
+
+func TestHostSourceCachesNonEmptyModel(t *testing.T) {
+	calls := 0
+	s := &HostSource{readModel: func() string {
+		calls++
+		return "  MacBookPro18,3\n"
+	}}
+
+	if got := s.Snapshot(); got.ProductModel != "MacBookPro18,3" {
+		t.Fatalf("first Snapshot().ProductModel = %q, want %q", got.ProductModel, "MacBookPro18,3")
+	}
+	if got := s.Snapshot(); got.ProductModel != "MacBookPro18,3" {
+		t.Fatalf("second Snapshot().ProductModel = %q, want cached model", got.ProductModel)
+	}
+	if calls != 1 {
+		t.Fatalf("read called %d times, want 1", calls)
+	}
+}
+
+func TestHostSourceCachesEmptyModel(t *testing.T) {
+	calls := 0
+	s := &HostSource{readModel: func() string {
+		calls++
+		return ""
+	}}
+
+	if got := s.Snapshot(); got.ProductModel != "" {
+		t.Fatalf("first Snapshot().ProductModel = %q, want empty", got.ProductModel)
+	}
+	if got := s.Snapshot(); got.ProductModel != "" {
+		t.Fatalf("second Snapshot().ProductModel = %q, want cached empty result", got.ProductModel)
+	}
+	if calls != 1 {
+		t.Fatalf("read called %d times, want 1", calls)
+	}
+}
+
+func TestHostSourceReadsOnceAcrossConcurrentCalls(t *testing.T) {
+	var calls atomic.Int32
+	s := &HostSource{readModel: func() string {
+		calls.Add(1)
+		return "ThinkPad X1 Carbon"
+	}}
+
+	const goroutines = 32
+	var wg sync.WaitGroup
+	wg.Add(goroutines)
+	for i := 0; i < goroutines; i++ {
+		go func() {
+			defer wg.Done()
+			snapshot := s.Snapshot()
+			if snapshot.ProductModel != "ThinkPad X1 Carbon" {
+				t.Errorf("Snapshot().ProductModel = %q, want %q", snapshot.ProductModel, "ThinkPad X1 Carbon")
+			}
+		}()
+	}
+	wg.Wait()
+
+	if got := calls.Load(); got != 1 {
+		t.Fatalf("read called %d times, want 1", got)
+	}
+}
+
+func TestNormalizeDeviceModel(t *testing.T) {
+	tests := []struct {
+		name  string
+		model string
+		want  string
+	}{
+		{name: "trims surrounding whitespace", model: "  MacBookPro18,3\n", want: "MacBookPro18,3"},
+		{name: "trims device tree terminator", model: "Raspberry Pi 5\x00", want: "Raspberry Pi 5"},
+		{name: "allows printable Unicode", model: "联想 ThinkPad X1", want: "联想 ThinkPad X1"},
+		{name: "rejects empty", model: " \t\r\n"},
+		{name: "rejects invalid UTF-8", model: string([]byte{'M', 0xff, '1'})},
+		{name: "removes CRLF", model: "model\r\nname", want: "modelname"},
+		{name: "normalizes tab", model: "model\tname", want: "model name"},
+		{name: "removes NUL", model: "model\x00name", want: "modelname"},
+		{name: "removes control character", model: "model\x1fname", want: "modelname"},
+		{name: "removes DEL", model: "model\x7fname", want: "modelname"},
+		{name: "normalizes Unicode line separator", model: "model\u2028name", want: "model name"},
+		{name: "collapses whitespace", model: "  model\t \u00a0 name  ", want: "model name"},
+		{name: "accepts maximum byte length", model: strings.Repeat("a", deviceModelMaxBytes), want: strings.Repeat("a", deviceModelMaxBytes)},
+		{name: "rejects overlong value", model: strings.Repeat("a", deviceModelMaxBytes+1)},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := normalizeDeviceModel(tt.model); got != tt.want {
+				t.Fatalf("normalizeDeviceModel(%q) = %q, want %q", tt.model, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestNormalizeDeviceModelRemovesHTTPControlBytes(t *testing.T) {
+	for value := 0; value <= 0x7f; value++ {
+		if value >= 0x20 && value < 0x7f {
+			continue
+		}
+		t.Run(fmt.Sprintf("0x%02x", value), func(t *testing.T) {
+			model := "model" + string(rune(value)) + "name"
+			want := "modelname"
+			if value != '\r' && value != '\n' && value != '\x00' && unicode.IsSpace(rune(value)) {
+				want = "model name"
+			}
+			if got := normalizeDeviceModel(model); got != want {
+				t.Fatalf("normalizeDeviceModel(%q) = %q, want %q", model, got, want)
+			}
+		})
+	}
+}
+
+func TestGetOSType(t *testing.T) {
+	tests := []struct {
+		name string
+		want OSType
+	}{
+		{name: "Windows", want: OSTypeWindows},
+		{name: "Linux", want: OSTypeLinux},
+		{name: "MacOS", want: OSTypeMacOS},
+		{name: "unknown", want: OSTypeUnknown},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := GetOSType(tt.name); got != tt.want {
+				t.Errorf("GetOSType(%q) = %q, want %q", tt.name, got, tt.want)
+			}
+		})
+	}
+}

internal/riskcontrol/osmodel_windows.go

@@ -0,0 +1,44 @@
+//go:build windows
+
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package riskcontrol
+
+import "golang.org/x/sys/windows/registry"
+
+// systemInfoRegistryPaths lists registry locations in device-model lookup order.
+var systemInfoRegistryPaths = [...]string{
+	`HARDWARE\DESCRIPTION\System\BIOS`,
+	`SYSTEM\CurrentControlSet\Control\SystemInformation`,
+	`SYSTEM\HardwareConfig\Current`,
+}
+
+// readDeviceModel returns the first product name found in the Windows registry.
+func readDeviceModel() string {
+	return readWindowsDeviceModel(readWindowsRegistryModel)
+}
+
+func readWindowsRegistryModel(path string) (string, error) {
+	key, err := registry.OpenKey(registry.LOCAL_MACHINE, path, registry.READ)
+	if err != nil {
+		return "", err
+	}
+	defer key.Close()
+
+	model, _, err := key.GetStringValue("SystemProductName")
+	return model, err
+}
+
+func readWindowsDeviceModel(readRegistryModel func(string) (string, error)) string {
+	for _, path := range systemInfoRegistryPaths {
+		model, err := readRegistryModel(path)
+		if err != nil {
+			continue
+		}
+		if model = normalizeDeviceModel(model); model != "" {
+			return model
+		}
+	}
+	return ""
+}

internal/riskcontrol/osmodel_windows_test.go

@@ -0,0 +1,78 @@
+//go:build windows
+
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package riskcontrol
+
+import (
+	"errors"
+	"reflect"
+	"testing"
+)
+
+func TestReadWindowsDeviceModelFallback(t *testing.T) {
+	readError := errors.New("registry read failed")
+	tests := []struct {
+		name      string
+		values    map[string]string
+		errors    map[string]error
+		want      string
+		wantPaths []string
+	}{
+		{
+			name:      "first path wins",
+			values:    map[string]string{systemInfoRegistryPaths[0]: "Surface Laptop"},
+			want:      "Surface Laptop",
+			wantPaths: []string{systemInfoRegistryPaths[0]},
+		},
+		{
+			name: "read failure falls back",
+			errors: map[string]error{
+				systemInfoRegistryPaths[0]: readError,
+			},
+			values: map[string]string{
+				systemInfoRegistryPaths[1]: "ThinkPad X1 Carbon",
+			},
+			want:      "ThinkPad X1 Carbon",
+			wantPaths: systemInfoRegistryPaths[:2],
+		},
+		{
+			name: "empty normalized value falls back",
+			values: map[string]string{
+				systemInfoRegistryPaths[0]: " \r\n\x00",
+				systemInfoRegistryPaths[1]: "Latitude 7450",
+			},
+			want:      "Latitude 7450",
+			wantPaths: systemInfoRegistryPaths[:2],
+		},
+		{
+			name: "all paths fail",
+			errors: map[string]error{
+				systemInfoRegistryPaths[0]: readError,
+				systemInfoRegistryPaths[1]: readError,
+				systemInfoRegistryPaths[2]: readError,
+			},
+			wantPaths: systemInfoRegistryPaths[:],
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var paths []string
+			got := readWindowsDeviceModel(func(path string) (string, error) {
+				paths = append(paths, path)
+				if err := tt.errors[path]; err != nil {
+					return "", err
+				}
+				return tt.values[path], nil
+			})
+			if got != tt.want {
+				t.Fatalf("model = %q, want %q", got, tt.want)
+			}
+			if !reflect.DeepEqual(paths, tt.wantPaths) {
+				t.Fatalf("registry paths = %v, want %v", paths, tt.wantPaths)
+			}
+		})
+	}
+}

internal/riskcontrol/transport.go

@@ -0,0 +1,162 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package riskcontrol
+
+import (
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/larksuite/cli/internal/core"
+	internaltransport "github.com/larksuite/cli/internal/transport"
+)
+
+var _ internaltransport.RoundTripperDecorator = (*Transport)(nil)
+
+const (
+	HeaderProductModel = "X-Agent-Device-Type"
+	HeaderOSType       = "X-Agent-Os-Type"
+)
+
+var restrictedHeaders = [...]string{HeaderProductModel, HeaderOSType}
+
+// Transport is the feature's final outbound boundary. It removes caller- or
+// extension-supplied signal headers first and writes trusted values only after
+// authorizing an official SDK origin and authentication state.
+type Transport struct {
+	next   http.RoundTripper
+	source Source
+}
+
+// NewTransport creates the final SDK outbound policy boundary. A nil source
+// disables collection and injection while preserving restricted-header
+// stripping for opt-out and extension-credential requests.
+func NewTransport(next http.RoundTripper, source Source) *Transport {
+	if next == nil {
+		next = internaltransport.Fallback()
+	}
+	return &Transport{
+		next:   next,
+		source: source,
+	}
+}
+
+// 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())
+	if req.Header == nil {
+		req.Header = make(http.Header)
+	}
+	stripRestrictedHeaders(req.Header)
+
+	if t.source != nil && t.routeAllowsSignals(req) {
+		snapshot := t.source.Snapshot()
+		if isSupportedOSType(snapshot.OSType) {
+			req.Header.Set(HeaderOSType, string(snapshot.OSType))
+		}
+		if model := normalizeDeviceModel(snapshot.ProductModel); model != "" {
+			req.Header.Set(HeaderProductModel, model)
+		}
+	}
+	return t.next.RoundTrip(req)
+}
+
+func isSupportedOSType(value OSType) bool {
+	switch value {
+	case OSTypeWindows, OSTypeLinux, OSTypeMacOS:
+		return true
+	default:
+		return false
+	}
+}
+
+func stripRestrictedHeaders(header http.Header) {
+	for name := range header {
+		for _, restricted := range restrictedHeaders {
+			if strings.EqualFold(name, restricted) {
+				delete(header, name)
+				break
+			}
+		}
+	}
+}
+
+type origin struct {
+	scheme string
+	host   string
+	port   string
+}
+
+var officialFeishuOrigins = [...]origin{
+	apiOrigin(core.BrandFeishu, core.ResolveEndpoints(core.BrandFeishu).Open),
+	apiOrigin(core.BrandLark, core.ResolveEndpoints(core.BrandLark).Open),
+	apiOrigin(core.BrandFeishu, core.ResolveEndpoints(core.BrandFeishu).Accounts),
+	apiOrigin(core.BrandLark, core.ResolveEndpoints(core.BrandLark).Accounts),
+}
+
+func (t *Transport) routeAllowsSignals(req *http.Request) bool {
+	if req == nil || req.URL == nil {
+		return false
+	}
+	return isOfficialFeishuOrigin(originOf(req.URL))
+}
+
+func originOf(value *url.URL) origin {
+	if value == nil {
+		return origin{}
+	}
+	scheme := strings.ToLower(value.Scheme)
+	port := value.Port()
+	if port == "" {
+		switch scheme {
+		case "https":
+			port = "443"
+		case "http":
+			port = "80"
+		}
+	}
+	return origin{scheme: scheme, host: strings.ToLower(value.Hostname()), port: port}
+}
+
+func apiOrigin(brand core.LarkBrand, endpointURL string) origin {
+	endpoint, err := url.Parse(endpointURL)
+	if err != nil {
+		return origin{}
+	}
+	return originOf(endpoint)
+}
+
+func isOfficialFeishuOrigin(candidate origin) bool {
+	if candidate.scheme != "https" || candidate.port != "443" {
+		return false
+	}
+	for _, official := range officialFeishuOrigins {
+		if candidate == official {
+			return true
+		}
+	}
+	return false
+}

internal/riskcontrol/transport_test.go

@@ -0,0 +1,124 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package riskcontrol
+
+import (
+	"net/http"
+	"strings"
+	"sync/atomic"
+	"testing"
+)
+
+type roundTripFunc func(*http.Request) (*http.Response, error)
+
+func (f roundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
+	return f(req)
+}
+
+type countingSource struct {
+	calls atomic.Int32
+}
+
+func (s *countingSource) Snapshot() Snapshot {
+	s.calls.Add(1)
+	return Snapshot{OSType: OSTypeMacOS, ProductModel: "Mac16,1"}
+}
+
+type staticSource Snapshot
+
+func (s staticSource) Snapshot() Snapshot { return Snapshot(s) }
+
+func TestTransportAuthorizesBeforeCollecting(t *testing.T) {
+	tests := []struct {
+		name          string
+		requestURL    string
+		authorization string
+		wantSignals   bool
+	}{
+		{name: "authenticated official HTTPS", requestURL: "https://open.feishu.cn/open-apis/test", authorization: "Bearer token", wantSignals: true},
+		{name: "Lark official HTTPS", requestURL: "https://open.larksuite.com/open-apis/test", authorization: "Bearer token", wantSignals: true},
+		{name: "official explicit HTTPS port", requestURL: "https://OPEN.FEISHU.CN:443/open-apis/test", authorization: "Bearer token", wantSignals: true},
+		{name: "unauthenticated", requestURL: "https://open.feishu.cn/open-apis/test", wantSignals: true},
+		{name: "official non-OpenAPI origin", requestURL: "https://accounts.feishu.cn/open-apis/test", authorization: "Bearer token", wantSignals: true},
+		{name: "off domain", requestURL: "https://example.com/test", authorization: "Bearer token", wantSignals: false},
+		{name: "lookalike", requestURL: "https://open.feishu.cn.evil.example/test", authorization: "Bearer token", wantSignals: false},
+		{name: "plain HTTP", requestURL: "http://open.feishu.cn/test", authorization: "Bearer token", wantSignals: false},
+		{name: "non-default port", requestURL: "https://open.feishu.cn:8443/test", authorization: "Bearer token", wantSignals: false},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			source := &countingSource{}
+			var received http.Header
+			base := roundTripFunc(func(req *http.Request) (*http.Response, error) {
+				received = req.Header.Clone()
+				return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}, nil
+			})
+			req, err := http.NewRequest(http.MethodGet, test.requestURL, nil)
+			if err != nil {
+				t.Fatal(err)
+			}
+			req.Header.Set("Authorization", test.authorization)
+			req.Header.Set(HeaderOSType, "caller-value")
+			req.Header.Set(HeaderProductModel, "caller-value")
+			req.Header["x-agent-device-type"] = []string{"non-canonical-caller-value"}
+
+			resp, err := NewTransport(base, source).RoundTrip(req)
+			if err != nil {
+				t.Fatal(err)
+			}
+			resp.Body.Close()
+
+			gotSignals := received.Get(HeaderOSType) != ""
+			if gotSignals != test.wantSignals {
+				t.Fatalf("signals present = %t, want %t; headers=%v", gotSignals, test.wantSignals, received)
+			}
+			wantCalls := int32(0)
+			if test.wantSignals {
+				wantCalls = 1
+			}
+			if got := source.calls.Load(); got != wantCalls {
+				t.Fatalf("Snapshot calls = %d, want %d", got, wantCalls)
+			}
+			if got := req.Header.Get(HeaderOSType); got != "caller-value" {
+				t.Fatalf("caller request OS header = %q, want unchanged", got)
+			}
+			if got := req.Header.Get(HeaderProductModel); got != "caller-value" {
+				t.Fatalf("caller request product-model header = %q, want unchanged", got)
+			}
+			if !test.wantSignals {
+				for name := range received {
+					if strings.EqualFold(name, HeaderProductModel) || strings.EqualFold(name, HeaderOSType) {
+						t.Fatalf("restricted header leaked as %q", name)
+					}
+				}
+			}
+		})
+	}
+}
+
+func TestTransportValidatesSourceSnapshot(t *testing.T) {
+	var received http.Header
+	base := roundTripFunc(func(req *http.Request) (*http.Response, error) {
+		received = req.Header.Clone()
+		return &http.Response{StatusCode: http.StatusOK, Body: http.NoBody}, nil
+	})
+	req, err := http.NewRequest(http.MethodGet, "https://open.feishu.cn/open-apis/test", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	req.Header.Set("Authorization", "Bearer token")
+
+	resp, err := NewTransport(base, staticSource{
+		OSType:       OSType("unsupported"),
+		ProductModel: "unsafe\nvalue",
+	}).RoundTrip(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp.Body.Close()
+	if received.Get(HeaderOSType) == "" && received.Get(HeaderProductModel) == "" {
+		t.Fatalf("no signals collected: %v", received)
+	}
+}

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/path.go

@@ -17,6 +17,13 @@ func SafeInputPath(path string) (string, error) {
 	return localfileio.SafeInputPath(path)
 }
 
+// LocalInputPath validates a local input path without restricting it to the
+// current working directory. It delegates to localfileio.LocalInputPath so
+// command validation and shared local-file readers use one policy.
+func LocalInputPath(path string) (string, error) {
+	return localfileio.LocalInputPath(path)
+}
+
 // SafeEnvDirPath validates an environment-provided application directory path.
 // Delegates to localfileio.SafeEnvDirPath.
 func SafeEnvDirPath(path, envName string) (string, error) {

internal/validate/path_test.go

@@ -211,6 +211,18 @@ func TestSafeLocalFlagPath(t *testing.T) {
 	}
 }
 
+func TestLocalInputPath_AllowsLocalPathsAndRejectsUnsafeCharacters(t *testing.T) {
+	for _, path := range []string{"/tmp/report.pdf", "../report.pdf"} {
+		got, err := LocalInputPath(path)
+		if err != nil || got != path {
+			t.Fatalf("LocalInputPath(%q) = %q, %v; want unchanged path", path, got, err)
+		}
+	}
+	if _, err := LocalInputPath("report\n.pdf"); err == nil {
+		t.Fatal("LocalInputPath() unexpectedly accepted a control character")
+	}
+}
+
 func TestSafeUploadPath_AllowsTempFileAbsolutePath(t *testing.T) {
 	// GIVEN: a real temp file (absolute path under os.TempDir())
 	f, err := os.CreateTemp("", "upload-test-*.bin")

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")
+	}
+}

internal/vfs/localfileio/path.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"path/filepath"
 	"strings"
+	"unicode"
 
 	"github.com/larksuite/cli/internal/charcheck"
 	"github.com/larksuite/cli/internal/vfs"
@@ -22,6 +23,32 @@ func SafeInputPath(path string) (string, error) {
 	return safePath(path, "--file")
 }
 
+// LocalInputPath validates an input path in the process local filesystem
+// namespace. It intentionally does not impose cwd containment or canonicalize
+// the path: absolute paths, parent-relative paths, and symlink traversal retain
+// their normal OS semantics. Character validation remains mandatory because
+// paths are user-controlled and may appear in errors or progress output.
+func LocalInputPath(path string) (string, error) {
+	if strings.TrimSpace(path) == "" {
+		return "", fmt.Errorf("local input path must not be empty")
+	}
+	if strings.IndexFunc(path, unicode.IsControl) >= 0 {
+		return "", fmt.Errorf("local input path must not contain control characters")
+	}
+	if err := charcheck.RejectControlChars(path, "local input path"); err != nil {
+		return "", err
+	}
+	if err := validateLocalInputPlatform(path); err != nil {
+		return "", err
+	}
+	return path, nil
+}
+
+func isWindowsNonLocalNamespace(path string) bool {
+	normalized := strings.ReplaceAll(path, "/", `\`)
+	return strings.HasPrefix(normalized, `\\`) || strings.HasPrefix(normalized, `\??\`)
+}
+
 // SafeLocalFlagPath validates a flag value as a local file path.
 // Empty values and http/https URLs are returned unchanged without validation.
 func SafeLocalFlagPath(flagName, value string) (string, error) {
@@ -29,7 +56,7 @@ func SafeLocalFlagPath(flagName, value string) (string, error) {
 		return value, nil
 	}
 	if _, err := SafeInputPath(value); err != nil {
-		return "", fmt.Errorf("%s: %v", flagName, err)
+		return "", fmt.Errorf("%s: %w", flagName, err)
 	}
 	return value, nil
 }

internal/vfs/localfileio/path_local_other.go

@@ -0,0 +1,8 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+//go:build !windows
+
+package localfileio
+
+func validateLocalInputPlatform(string) error { return nil }

internal/vfs/localfileio/path_local_windows.go

@@ -0,0 +1,33 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+//go:build windows
+
+package localfileio
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+)
+
+func validateLocalInputPlatform(path string) error {
+	if isWindowsNonLocalNamespace(path) {
+		return fmt.Errorf("local input path must not use a Windows network or device namespace")
+	}
+
+	cleaned := filepath.Clean(path)
+	volume := filepath.VolumeName(cleaned)
+	remainder := strings.TrimLeft(cleaned[len(volume):], `\/`)
+	for _, component := range strings.FieldsFunc(remainder, func(r rune) bool {
+		return r == '\\' || r == '/'
+	}) {
+		if component == "." || component == ".." {
+			continue
+		}
+		if !filepath.IsLocal(component) {
+			return fmt.Errorf("local input path contains a reserved Windows path component %q", component)
+		}
+	}
+	return nil
+}

internal/vfs/localfileio/path_local_windows_test.go

@@ -0,0 +1,27 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+//go:build windows
+
+package localfileio
+
+import "testing"
+
+func TestLocalInputPath_RejectsWindowsNetworkDeviceAndReservedPaths(t *testing.T) {
+	for _, input := range []string{
+		`\\server\share\report.pdf`,
+		`//server/share/report.pdf`,
+		`\\.\pipe\upload`,
+		`\\?\C:\Users\agent\report.pdf`,
+		`\\?\UNC\server\share\report.pdf`,
+		`\??\C:\Users\agent\report.pdf`,
+		`C:\Users\agent\NUL.txt`,
+		`CON`,
+	} {
+		t.Run(input, func(t *testing.T) {
+			if _, err := LocalInputPath(input); err == nil {
+				t.Fatalf("LocalInputPath(%q) unexpectedly succeeded", input)
+			}
+		})
+	}
+}

internal/vfs/localfileio/path_test.go

@@ -4,6 +4,7 @@
 package localfileio
 
 import (
+	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
@@ -71,6 +72,72 @@ func TestSafeOutputPath_RejectsPathTraversalAndDangerousInput(t *testing.T) {
 	}
 }
 
+func TestLocalInputPath_AllowsLocalNamespaceWithoutRewriting(t *testing.T) {
+	for _, input := range []string{
+		"/tmp/report.pdf",
+		"../outside/report.pdf",
+		"./report.pdf",
+		"nested/../report.pdf",
+		`C:\Users\agent\report.pdf`,
+		"报告.pdf",
+	} {
+		t.Run(input, func(t *testing.T) {
+			got, err := LocalInputPath(input)
+			if err != nil {
+				t.Fatalf("LocalInputPath(%q) error = %v", input, err)
+			}
+			if got != input {
+				t.Fatalf("LocalInputPath(%q) = %q, want path preserved verbatim", input, got)
+			}
+		})
+	}
+}
+
+func TestWindowsNonLocalNamespace(t *testing.T) {
+	for _, input := range []string{
+		`\\server\share\report.pdf`,
+		`//server/share/report.pdf`,
+		`\\.\pipe\upload`,
+		`\\?\C:\Users\agent\report.pdf`,
+		`\\?\UNC\server\share\report.pdf`,
+		`\??\C:\Users\agent\report.pdf`,
+	} {
+		if !isWindowsNonLocalNamespace(input) {
+			t.Errorf("isWindowsNonLocalNamespace(%q) = false, want true", input)
+		}
+	}
+
+	for _, input := range []string{
+		`C:\Users\agent\report.pdf`,
+		`C:/Users/agent/report.pdf`,
+		`..\outside\report.pdf`,
+		`.\report.pdf`,
+	} {
+		if isWindowsNonLocalNamespace(input) {
+			t.Errorf("isWindowsNonLocalNamespace(%q) = true, want false", input)
+		}
+	}
+}
+
+func TestLocalInputPath_RejectsEmptyControlAndDangerousUnicode(t *testing.T) {
+	for _, input := range []string{
+		"",
+		"   ",
+		"file\x00.txt",
+		"file\tname.txt",
+		"file\nname.txt",
+		"file\rname.txt",
+		"file\u202Ename.txt",
+		"file\u200Bname.txt",
+	} {
+		t.Run(fmt.Sprintf("%q", input), func(t *testing.T) {
+			if _, err := LocalInputPath(input); err == nil {
+				t.Fatalf("LocalInputPath(%q) unexpectedly succeeded", input)
+			}
+		})
+	}
+}
+
 func TestSafeOutputPath_ReturnsCanonicalAbsolutePath(t *testing.T) {
 	// GIVEN: a clean temp directory as CWD
 	dir := t.TempDir()

lint/README.md

@@ -19,7 +19,7 @@ lint/
 ├── lintapi/            # shared types every domain returns
 │   └── violation.go    # Violation, Action, ActionReject / ActionLabel / ActionWarning
 └── errscontract/       # first domain: typed-error contract guards
-    ├── scan.go         # ScanRepo(root) ([]lintapi.Violation, error)  ← public entry
+    ├── scan.go         # ScanRepoWithOptions(root, opts)  ← public entry
     ├── runner.go
     ├── typecheck.go
     ├── violation.go    # local type aliases to lintapi
@@ -30,16 +30,19 @@ lint/
     ├── rule_subtype_classifier.go
     ├── rule_typed_error_completeness.go
     └── *_test.go
-└── domaincontract/     # endpoint domain contract: no hardcoded resolver hosts
-    ├── scan.go         # ScanRepo(root) ([]lintapi.Violation, error)  ← public entry
-    └── scan_test.go
+└── domaincontract/     # resolver ownership + approved public hostname policy
+    ├── scan.go         # ScanRepoWithOptions(root, opts)  ← public entry
+    ├── unapproved.go   # Go AST/type-aware hostname extraction
+    ├── policy.go       # exact public/fixture allowlist validation
+    ├── diff.go         # added-line attribution
+    └── *_test.go
 ```
 
 ## Endpoint domain contract (`domaincontract`)
 
-`domaincontract` is a syntax-level regression guard for the resolver-owned
-Open, Accounts, MCP, and AppLink hosts used by the Go CLI. In production `.go`
-files it rejects:
+`domaincontract` contains two complementary Go source guards.
+
+The resolver-ownership guard rejects:
 
 - string literals containing a resolver-owned host FQDN
   (`{open,accounts,mcp,applink}.{feishu.cn,larksuite.com}`), and
@@ -59,17 +62,54 @@ parse-level guard). The forbidden-host list is bound to the resolver source by
 `TestForbiddenHostsMatchResolver`, so adding a resolver domain without updating
 the guard fails the lint module's tests.
 
-This is not a general outbound-URL or data-flow analyzer. It does not inspect
-non-Go assets, hosts assembled from string fragments, SDK constructor option
-flow, or previously unknown Feishu/Lark hosts. The literal rule and code review
-remain the backstop for those cases.
+The approved-domain guard parses every Git-tracked Go file in full. In CI,
+unapproved-host findings are limited to values whose expressions intersect an
+added line; policy validation and unused-entry checks remain repository-wide.
+It rejects an exact hostname unless it is present in one of:
 
-To add or change an outbound endpoint, edit the resolver — never hardcode a host.
+- `internal/qualitygate/config/allowlists/public-domains.txt`, for production
+  and test code; or
+- `internal/qualitygate/config/allowlists/fixture-domains.txt`, only for
+  `*_test.go`, the repository-root `tests/`, and any `testdata/` (never
+  `skills/`).
+
+RFC 2606 example/test names are accepted independently of those lists. This
+includes the reserved `.test`, `.example`, `.invalid`, and `.localhost`
+namespaces and the exact names `example.com`, `example.net`, and `example.org`;
+they are safe placeholders rather than supported public endpoints.
+
+High-confidence evidence is deliberately limited to static string expressions
+assigned to `host`, `hostname`, or `domain` semantic names (including common
+case/plural forms and collections), plus static strings whose entire value is
+an absolute `http`, `https`, `ws`, or `wss` URL. It supports Go literals,
+escapes, compile-time concatenation, constant references, grouped declarations,
+multi-value assignments, and multiline expressions. Bare domain-shaped strings
+without hostname semantics are not blocked.
+
+Sequence values are scanned individually. For a hostname-semantic map, a key or
+value is evidence only when it is the sole hostname-shaped side of that entry;
+ambiguous string-to-string entries are not guessed. Struct fields use Go type
+information so known non-network `Host` / `Domain` fields do not become hostname
+evidence merely because an enum or command category contains a dot.
+
+Allowlist matching is lowercase and exact: there are no wildcard, suffix, DNS,
+or public-suffix exceptions. Entries must be sorted and unique, use ASCII
+hostnames, and have a current in-scope use. See
+`internal/qualitygate/config/README.md` for admission and approval rules.
+
+This is not a general outbound-URL or cross-language data-flow analyzer. It does
+not inspect non-Go assets or dynamically constructed values.
+
+To add or change a resolver-owned Feishu/Lark endpoint, edit the resolver rather
+than hardcoding the host elsewhere.
 
 ## Running
 
 ```bash
-# from the repo root (one level above lint/)
+# PR-scoped scan from the repo root (one level above lint/)
+go run -C lint . --changed-from <base-revision> ..
+
+# Full inventory (also reports historical unapproved hostnames)
 go run -C lint . ..
 ```
 
@@ -100,10 +140,14 @@ Exit codes follow `lint/main.go`:
 
    import "github.com/larksuite/cli/lint/lintapi"
 
-   // ScanRepo walks root and returns every violation produced by this
-   // domain's checks. Domains MUST return []lintapi.Violation so the
-   // top-level dispatcher can aggregate uniformly.
-   func ScanRepo(root string) ([]lintapi.Violation, error) { ... }
+   type ScanOptions struct {
+       ChangedFrom string
+   }
+
+   // ScanRepoWithOptions walks root and returns every violation produced
+   // by this domain's checks. Domains MUST return []lintapi.Violation so
+   // the top-level dispatcher can aggregate uniformly.
+   func ScanRepoWithOptions(root string, opts ScanOptions) ([]lintapi.Violation, error) { ... }
    ```
 
 3. Per-rule files are named `rule_<name>.go` with sibling
@@ -114,8 +158,12 @@ Exit codes follow `lint/main.go`:
 
    ```go
    var scanners = []scanner{
-       {name: "errscontract", fn: errscontract.ScanRepo},
-       {name: "<domain>",     fn: <domain>.ScanRepo},  // ← add here
+       {name: "errscontract", fn: errscontract.ScanRepoWithOptions},
+       {name: "<domain>", fn: func(root string, opts errscontract.ScanOptions) ([]lintapi.Violation, error) {
+           return <domain>.ScanRepoWithOptions(root, <domain>.ScanOptions{
+               ChangedFrom: opts.ChangedFrom,
+           })
+       }},
    }
    ```
 

lint/domaincontract/diff.go

@@ -0,0 +1,171 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package domaincontract
+
+import (
+	"bytes"
+	"fmt"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+type addedLineRange struct {
+	Start int
+	End   int
+}
+
+type changedGoPath struct {
+	Old string
+	New string
+}
+
+var unifiedHunkRE = regexp.MustCompile(`^@@ -[0-9]+(?:,[0-9]+)? \+([0-9]+)(?:,([0-9]+))? @@`)
+
+func changedGoLineRanges(root, from string) (map[string][]addedLineRange, error) {
+	if from == "" {
+		return nil, nil
+	}
+	names, err := gitCommandOutput(
+		root,
+		"diff",
+		"--name-status",
+		"-z",
+		"--find-renames",
+		"--diff-filter=ACMR",
+		from+"...HEAD",
+		"--",
+	)
+	if err != nil {
+		return nil, fmt.Errorf("list changed Go files: %w", err)
+	}
+	paths, err := parseChangedGoPaths(names)
+	if err != nil {
+		return nil, fmt.Errorf("parse changed Go files: %w", err)
+	}
+
+	out := map[string][]addedLineRange{}
+	for _, path := range paths {
+		args := []string{
+			"diff",
+			"--unified=0",
+			"--no-color",
+			"--no-ext-diff",
+			"--find-renames",
+			"--diff-filter=ACMR",
+			from + "...HEAD",
+			"--",
+		}
+		if path.Old != path.New {
+			args = append(args, path.Old)
+		}
+		args = append(args, path.New)
+		patch, err := gitCommandOutput(root, args...)
+		if err != nil {
+			return nil, fmt.Errorf("read diff for %s: %w", path.New, err)
+		}
+		ranges, err := parseAddedLineRanges(patch)
+		if err != nil {
+			return nil, fmt.Errorf("parse diff for %s: %w", path.New, err)
+		}
+		out[path.New] = ranges
+	}
+	return out, nil
+}
+
+func parseChangedGoPaths(raw []byte) ([]changedGoPath, error) {
+	fields := bytes.Split(raw, []byte{0})
+	var out []changedGoPath
+	for i := 0; i < len(fields); {
+		status := string(fields[i])
+		i++
+		if status == "" {
+			break
+		}
+		if i >= len(fields) || len(fields[i]) == 0 {
+			return nil, fmt.Errorf("truncated name-status record")
+		}
+		oldPath := filepath.ToSlash(string(fields[i]))
+		i++
+		newPath := oldPath
+		if status[0] == 'R' || status[0] == 'C' {
+			if i >= len(fields) || len(fields[i]) == 0 {
+				return nil, fmt.Errorf("truncated rename/copy record for %q", oldPath)
+			}
+			newPath = filepath.ToSlash(string(fields[i]))
+			i++
+			if status[0] == 'C' {
+				// A copy introduces every destination line. Diff only the new
+				// path so Git presents it as an added file rather than a
+				// metadata-only copy with no added-line ranges.
+				oldPath = newPath
+			}
+		}
+		if !strings.HasSuffix(newPath, ".go") {
+			continue
+		}
+		out = append(out, changedGoPath{Old: oldPath, New: newPath})
+	}
+	return out, nil
+}
+
+func parseAddedLineRanges(patch []byte) ([]addedLineRange, error) {
+	var out []addedLineRange
+	for _, raw := range bytes.Split(patch, []byte{'\n'}) {
+		line := string(raw)
+		if !strings.HasPrefix(line, "@@") {
+			continue
+		}
+		match := unifiedHunkRE.FindStringSubmatch(line)
+		if match == nil {
+			return nil, fmt.Errorf("unsupported unified hunk header %q", line)
+		}
+		start, err := strconv.Atoi(match[1])
+		if err != nil {
+			return nil, fmt.Errorf("parse added start line in %q: %w", line, err)
+		}
+		count := 1
+		if match[2] != "" {
+			count, err = strconv.Atoi(match[2])
+			if err != nil {
+				return nil, fmt.Errorf("parse added line count in %q: %w", line, err)
+			}
+		}
+		if count == 0 {
+			continue
+		}
+		out = append(out, addedLineRange{Start: start, End: start + count - 1})
+	}
+	return out, nil
+}
+
+func firstAddedLineInSpan(ranges []addedLineRange, start, end int) (int, bool) {
+	for _, r := range ranges {
+		if start <= r.End && end >= r.Start {
+			if start > r.Start {
+				return start, true
+			}
+			return r.Start, true
+		}
+	}
+	return 0, false
+}
+
+func gitCommandOutput(root string, args ...string) ([]byte, error) {
+	cmd := exec.Command("git", args...)
+	cmd.Dir = root
+	out, err := cmd.Output()
+	if err == nil {
+		return out, nil
+	}
+	if exitErr, ok := err.(*exec.ExitError); ok {
+		stderr := strings.TrimSpace(string(exitErr.Stderr))
+		if stderr != "" {
+			return nil, fmt.Errorf("%w: %s", err, stderr)
+		}
+	}
+	return nil, err
+}

lint/domaincontract/diff_test.go

@@ -0,0 +1,96 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package domaincontract
+
+import "testing"
+
+func TestParseChangedGoPaths(t *testing.T) {
+	raw := []byte("M\x00changed.go\x00R100\x00old.go\x00renamed.go\x00C100\x00source.go\x00copied.go\x00A\x00README.md\x00")
+	got, err := parseChangedGoPaths(raw)
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []changedGoPath{
+		{Old: "changed.go", New: "changed.go"},
+		{Old: "old.go", New: "renamed.go"},
+		{Old: "copied.go", New: "copied.go"},
+	}
+	if len(got) != len(want) {
+		t.Fatalf("paths = %#v, want %#v", got, want)
+	}
+	for i := range got {
+		if got[i] != want[i] {
+			t.Fatalf("paths = %#v, want %#v", got, want)
+		}
+	}
+}
+
+func TestParseChangedGoPathsRejectsTruncatedRename(t *testing.T) {
+	if _, err := parseChangedGoPaths([]byte("R100\x00old.go\x00")); err == nil {
+		t.Fatal("expected truncated rename error")
+	}
+}
+
+func TestParseAddedLineRanges(t *testing.T) {
+	patch := []byte(`diff --git a/x.go b/x.go
+index 1111111..2222222 100644
+--- a/x.go
++++ b/x.go
+@@ -2,0 +3,2 @@
++first
++second
+@@ -10 +12 @@
+-old
++new
+@@ -20 +21,0 @@
+-deleted
+`)
+	got, err := parseAddedLineRanges(patch)
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []addedLineRange{{Start: 3, End: 4}, {Start: 12, End: 12}}
+	if len(got) != len(want) {
+		t.Fatalf("ranges = %#v, want %#v", got, want)
+	}
+	for i := range got {
+		if got[i] != want[i] {
+			t.Fatalf("ranges = %#v, want %#v", got, want)
+		}
+	}
+}
+
+func TestParseAddedLineRangesRejectsUnknownHunk(t *testing.T) {
+	if _, err := parseAddedLineRanges([]byte("@@@ unsupported @@@\n")); err == nil {
+		t.Fatal("expected unsupported hunk error")
+	}
+}
+
+func TestFirstAddedLineInSpan(t *testing.T) {
+	ranges := []addedLineRange{{Start: 5, End: 7}, {Start: 10, End: 10}}
+	tests := []struct {
+		start, end int
+		line       int
+		ok         bool
+	}{
+		{start: 1, end: 4, ok: false},
+		{start: 4, end: 6, line: 5, ok: true},
+		{start: 6, end: 9, line: 6, ok: true},
+		{start: 8, end: 12, line: 10, ok: true},
+	}
+	for _, tc := range tests {
+		line, ok := firstAddedLineInSpan(ranges, tc.start, tc.end)
+		if line != tc.line || ok != tc.ok {
+			t.Errorf(
+				"firstAddedLineInSpan(%d, %d) = (%d, %v), want (%d, %v)",
+				tc.start,
+				tc.end,
+				line,
+				ok,
+				tc.line,
+				tc.ok,
+			)
+		}
+	}
+}

lint/domaincontract/policy.go

@@ -0,0 +1,126 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package domaincontract
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const (
+	publicDomainsPath  = "internal/qualitygate/config/allowlists/public-domains.txt"
+	fixtureDomainsPath = "internal/qualitygate/config/allowlists/fixture-domains.txt"
+)
+
+type domainPolicyEntry struct {
+	Host string
+	File string
+	Line int
+}
+
+type domainPolicy struct {
+	Public   map[string]domainPolicyEntry
+	Fixtures map[string]domainPolicyEntry
+}
+
+// isReservedExampleHostname recognizes only names reserved by RFC 2606 for
+// examples, testing, invalid-name examples, and localhost use. These names are
+// safe source placeholders and are policy exceptions, not supported public
+// endpoints.
+func isReservedExampleHostname(host string) bool {
+	host = strings.TrimSuffix(strings.ToLower(strings.TrimSpace(host)), ".")
+	switch host {
+	case "example.com", "example.net", "example.org":
+		return true
+	}
+	labels := strings.Split(host, ".")
+	switch labels[len(labels)-1] {
+	case "test", "example", "invalid", "localhost":
+		return true
+	default:
+		return false
+	}
+}
+
+func loadDomainPolicy(root string) (domainPolicy, error) {
+	public, err := loadDomainList(root, publicDomainsPath)
+	if err != nil {
+		return domainPolicy{}, err
+	}
+	fixtures, err := loadDomainList(root, fixtureDomainsPath)
+	if err != nil {
+		return domainPolicy{}, err
+	}
+	for host, entry := range fixtures {
+		if publicEntry, ok := public[host]; ok {
+			return domainPolicy{}, fmt.Errorf(
+				"%s:%d: hostname %q is already listed at %s:%d",
+				entry.File, entry.Line, host, publicEntry.File, publicEntry.Line,
+			)
+		}
+	}
+	return domainPolicy{Public: public, Fixtures: fixtures}, nil
+}
+
+func loadDomainList(root, rel string) (map[string]domainPolicyEntry, error) {
+	path := filepath.Join(root, filepath.FromSlash(rel))
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, fmt.Errorf("open domain allowlist %s: %w", rel, err)
+	}
+	defer file.Close()
+
+	entries := map[string]domainPolicyEntry{}
+	var previous string
+	scanner := bufio.NewScanner(file)
+	for line := 1; scanner.Scan(); line++ {
+		host := strings.TrimSpace(scanner.Text())
+		if host == "" || strings.HasPrefix(host, "#") {
+			continue
+		}
+		if host != strings.ToLower(host) {
+			return nil, fmt.Errorf("%s:%d: hostname must be lowercase: %q", rel, line, host)
+		}
+		if err := validatePolicyHostname(host); err != nil {
+			return nil, fmt.Errorf("%s:%d: %w", rel, line, err)
+		}
+		if previous != "" && host <= previous {
+			return nil, fmt.Errorf("%s:%d: hostnames must be unique and sorted: %q", rel, line, host)
+		}
+		entries[host] = domainPolicyEntry{Host: host, File: rel, Line: line}
+		previous = host
+	}
+	if err := scanner.Err(); err != nil {
+		return nil, fmt.Errorf("read domain allowlist %s: %w", rel, err)
+	}
+	if len(entries) == 0 {
+		return nil, fmt.Errorf("%s: domain list must not be empty", rel)
+	}
+	return entries, nil
+}
+
+func validatePolicyHostname(host string) error {
+	if len(host) > 253 || !strings.Contains(host, ".") || strings.HasSuffix(host, ".") {
+		return fmt.Errorf("invalid exact hostname %q", host)
+	}
+	labels := strings.Split(host, ".")
+	for _, label := range labels {
+		if len(label) == 0 || len(label) > 63 || label[0] == '-' || label[len(label)-1] == '-' {
+			return fmt.Errorf("invalid exact hostname %q", host)
+		}
+		for _, r := range label {
+			if (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9') || r == '-' {
+				continue
+			}
+			return fmt.Errorf("invalid exact hostname %q", host)
+		}
+	}
+	if !strings.ContainsAny(labels[len(labels)-1], "abcdefghijklmnopqrstuvwxyz") {
+		return fmt.Errorf("invalid exact hostname %q", host)
+	}
+	return nil
+}

lint/domaincontract/policy_test.go

@@ -0,0 +1,120 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package domaincontract
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestLoadDomainPolicy(t *testing.T) {
+	root := t.TempDir()
+	writeFile(t, root, publicDomainsPath, "# public\napi.example.com\nwww.example.com\n")
+	writeFile(t, root, fixtureDomainsPath, "# fixtures\nfixture.example.com\n")
+
+	policy, err := loadDomainPolicy(root)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(policy.Public) != 2 || len(policy.Fixtures) != 1 {
+		t.Fatalf("unexpected policy sizes: public=%d fixtures=%d", len(policy.Public), len(policy.Fixtures))
+	}
+	if policy.Public["api.example.com"].Line != 2 {
+		t.Fatalf("api.example.com line = %d, want 2", policy.Public["api.example.com"].Line)
+	}
+}
+
+func TestLoadDomainPolicyRejectsInvalidLists(t *testing.T) {
+	tests := []struct {
+		name     string
+		public   string
+		fixtures string
+		want     string
+	}{
+		{
+			name:     "uppercase",
+			public:   "API.example.com\n",
+			fixtures: "fixture.example.com\n",
+			want:     "must be lowercase",
+		},
+		{
+			name:     "unsorted",
+			public:   "www.example.com\napi.example.com\n",
+			fixtures: "fixture.example.com\n",
+			want:     "unique and sorted",
+		},
+		{
+			name:     "duplicate",
+			public:   "api.example.com\napi.example.com\n",
+			fixtures: "fixture.example.com\n",
+			want:     "unique and sorted",
+		},
+		{
+			name:     "wildcard",
+			public:   "*.example.com\n",
+			fixtures: "fixture.example.com\n",
+			want:     "invalid exact hostname",
+		},
+		{
+			name:     "scheme",
+			public:   "https://example.com\n",
+			fixtures: "fixture.example.com\n",
+			want:     "invalid exact hostname",
+		},
+		{
+			name:     "path",
+			public:   "api.example.com/v1\n",
+			fixtures: "fixture.example.com\n",
+			want:     "invalid exact hostname",
+		},
+		{
+			name:     "port",
+			public:   "api.example.com:443\n",
+			fixtures: "fixture.example.com\n",
+			want:     "invalid exact hostname",
+		},
+		{
+			name:     "cross-list duplicate",
+			public:   "api.example.com\n",
+			fixtures: "api.example.com\n",
+			want:     "already listed",
+		},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			root := t.TempDir()
+			writeFile(t, root, publicDomainsPath, tc.public)
+			writeFile(t, root, fixtureDomainsPath, tc.fixtures)
+			_, err := loadDomainPolicy(root)
+			if err == nil || !strings.Contains(err.Error(), tc.want) {
+				t.Fatalf("loadDomainPolicy() error = %v, want substring %q", err, tc.want)
+			}
+		})
+	}
+}
+
+func TestReservedExampleHostname(t *testing.T) {
+	for _, host := range []string{
+		"example.com",
+		"example.net",
+		"example.org",
+		"example.test",
+		"docs.example",
+		"missing.invalid",
+		"service.localhost",
+	} {
+		if !isReservedExampleHostname(host) {
+			t.Errorf("%q should be a reserved example hostname", host)
+		}
+	}
+	for _, host := range []string{
+		"attacker.example.com",
+		"example.dev",
+		"private.corp.internal",
+	} {
+		if isReservedExampleHostname(host) {
+			t.Errorf("%q must still require policy approval", host)
+		}
+	}
+}

lint/domaincontract/scan.go

@@ -1,8 +1,8 @@
 // Copyright (c) 2026 Lark Technologies Pte. Ltd.
 // SPDX-License-Identifier: MIT
 
-// Package domaincontract guards the Go CLI against direct reuse of the current
-// resolver-owned host FQDNs outside core.ResolveEndpoints.
+// Package domaincontract guards resolver ownership and rejects newly introduced
+// static Go hostnames that are not covered by the repository domain policy.
 package domaincontract
 
 import (
@@ -11,6 +11,7 @@ import (
 	"go/token"
 	"io/fs"
 	"path/filepath"
+	"sort"
 	"strconv"
 	"strings"
 
@@ -75,10 +76,40 @@ func skipDir(name string) bool {
 	return false
 }
 
-// ScanRepo walks production .go files under root and flags string literals
-// containing a forbidden resolver host outside the allowlist. Comments and
-// _test.go files are not scanned.
+// ScanRepo runs the resolver-owned endpoint guard and a full repository domain
+// inventory. CI should use ScanRepoWithOptions with a changed-from revision so
+// historical unapproved domains are not attributed to an unrelated change.
 func ScanRepo(root string) ([]lintapi.Violation, error) {
+	return ScanRepoWithOptions(root, ScanOptions{})
+}
+
+type ScanOptions struct {
+	ChangedFrom string
+}
+
+func ScanRepoWithOptions(root string, opts ScanOptions) ([]lintapi.Violation, error) {
+	out, err := scanHardcodedEndpoints(root)
+	if err != nil {
+		return nil, err
+	}
+	domainViolations, err := scanUnapprovedDomains(root, opts)
+	if err != nil {
+		return nil, err
+	}
+	out = append(out, domainViolations...)
+	sort.SliceStable(out, func(i, j int) bool {
+		if out[i].File != out[j].File {
+			return out[i].File < out[j].File
+		}
+		if out[i].Line != out[j].Line {
+			return out[i].Line < out[j].Line
+		}
+		return out[i].Rule < out[j].Rule
+	})
+	return out, nil
+}
+
+func scanHardcodedEndpoints(root string) ([]lintapi.Violation, error) {
 	var out []lintapi.Violation
 	err := filepath.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
 		if err != nil {

lint/domaincontract/unapproved.go

@@ -0,0 +1,911 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package domaincontract
+
+import (
+	"fmt"
+	"go/ast"
+	"go/constant"
+	"go/parser"
+	"go/token"
+	"go/types"
+	"net"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"unicode"
+
+	"github.com/larksuite/cli/lint/lintapi"
+	"golang.org/x/tools/go/packages"
+)
+
+const (
+	unapprovedDomainRule = "unapproved-domain"
+	unusedDomainRule     = "domain-allowlist-unused"
+	incompleteDomainRule = "domain-scan-incomplete"
+)
+
+type typedGoFile struct {
+	File *ast.File
+	Fset *token.FileSet
+	Info *types.Info
+}
+
+type domainEvidence struct {
+	Host string
+	Kind string
+	Expr ast.Expr
+}
+
+type evidenceKey struct {
+	Host       string
+	Start, End token.Pos
+}
+
+type fileDomainScan struct {
+	File             *ast.File
+	Fset             *token.FileSet
+	Info             *types.Info
+	Evidence         []domainEvidence
+	TypeInfoRequired []ast.Expr
+	seen             map[evidenceKey]bool
+	parents          map[ast.Node]ast.Node
+}
+
+type collectionCompositeKind uint8
+
+const (
+	notCollectionComposite collectionCompositeKind = iota
+	sequenceComposite
+	mapComposite
+)
+
+type hostnameFieldID struct {
+	Type  string
+	Field string
+}
+
+var nonNetworkHostnameFields = map[hostnameFieldID]bool{
+	{Type: "github.com/larksuite/cli/events/im.CardActionTriggerOutput", Field: "Host"}: true,
+	{Type: "github.com/larksuite/cli/internal/cmdmeta.Meta", Field: "Domain"}:           true,
+}
+
+func scanUnapprovedDomains(root string, opts ScanOptions) ([]lintapi.Violation, error) {
+	root, err := filepath.Abs(root)
+	if err != nil {
+		return nil, fmt.Errorf("resolve repository root: %w", err)
+	}
+	publicPath := filepath.Join(root, filepath.FromSlash(publicDomainsPath))
+	if _, err := os.Stat(publicPath); err != nil {
+		if os.IsNotExist(err) {
+			if _, goModErr := os.Stat(filepath.Join(root, "go.mod")); os.IsNotExist(goModErr) {
+				return nil, nil
+			}
+		}
+		return nil, fmt.Errorf("domain policy unavailable: %w", err)
+	}
+	policy, err := loadDomainPolicy(root)
+	if err != nil {
+		return nil, err
+	}
+	added, err := changedGoLineRanges(root, opts.ChangedFrom)
+	if err != nil {
+		return nil, err
+	}
+	typed, typeLoadErr := loadTypedGoFiles(root)
+	goFiles, err := trackedGoFiles(root)
+	if err != nil {
+		return nil, err
+	}
+
+	observedPublic := map[string]bool{}
+	observedFixtures := map[string]bool{}
+	inventoryComplete := typeLoadErr == nil
+	var out []lintapi.Violation
+	parseFailureReported := false
+	typeInfoGapReported := false
+	for _, rel := range goFiles {
+		path := filepath.Join(root, filepath.FromSlash(rel))
+		parsedFset := token.NewFileSet()
+		parsedFile, parseErr := parser.ParseFile(parsedFset, path, nil, 0)
+		if parseErr != nil {
+			inventoryComplete = false
+			if opts.ChangedFrom == "" {
+				out = append(out, incompleteDomainViolation(rel, parseErr))
+				parseFailureReported = true
+			} else if _, changed := added[rel]; changed {
+				out = append(out, incompleteDomainViolation(rel, parseErr))
+				parseFailureReported = true
+			}
+			continue
+		}
+		tf, ok := typed[filepath.Clean(path)]
+		if !ok {
+			tf = typedGoFile{File: parsedFile, Fset: parsedFset}
+		}
+
+		scan := newFileDomainScan(tf)
+		scan.collectSemanticEvidence()
+		scan.collectAbsoluteURLEvidence()
+		if len(scan.TypeInfoRequired) > 0 {
+			// Inventory completeness is a property of the whole HEAD. Whether
+			// this PR owns an incomplete-scan diagnostic is decided separately
+			// by the added-line intersection below.
+			inventoryComplete = false
+		}
+		for _, expr := range scan.TypeInfoRequired {
+			start := tf.Fset.Position(expr.Pos()).Line
+			end := tf.Fset.Position(expr.End()).Line
+			line := start
+			if opts.ChangedFrom != "" {
+				var intersects bool
+				line, intersects = firstAddedLineInSpan(added[rel], start, end)
+				if !intersects {
+					continue
+				}
+			}
+			typeInfoGapReported = true
+			out = append(out, incompleteDomainViolationAt(
+				rel,
+				line,
+				fmt.Errorf("Go type information unavailable for hostname-oriented field evidence"),
+			))
+			break
+		}
+		fixture := isDomainFixturePath(rel)
+		// The detector's own policy literals and contract corpus may be
+		// scanned, but they cannot justify keeping an allowlist entry.
+		policyOwner := strings.HasPrefix(rel, "lint/domaincontract/")
+		for _, evidence := range scan.Evidence {
+			if isReservedExampleHostname(evidence.Host) {
+				continue
+			}
+			if _, ok := policy.Public[evidence.Host]; ok {
+				if !fixture && !policyOwner {
+					observedPublic[evidence.Host] = true
+				}
+				continue
+			}
+			if _, ok := policy.Fixtures[evidence.Host]; ok && fixture {
+				if !policyOwner {
+					observedFixtures[evidence.Host] = true
+				}
+				continue
+			}
+			start := tf.Fset.Position(evidence.Expr.Pos()).Line
+			end := tf.Fset.Position(evidence.Expr.End()).Line
+			line := start
+			if opts.ChangedFrom != "" {
+				var intersects bool
+				line, intersects = firstAddedLineInSpan(added[rel], start, end)
+				if !intersects {
+					continue
+				}
+			}
+			suggestion := "remove the hostname or replace it with an approved public endpoint; " +
+				"public allowlist additions require evidence and CODEOWNER approval"
+			if _, fixtureOnly := policy.Fixtures[evidence.Host]; fixtureOnly && !fixture {
+				suggestion = "remove the fixture-only hostname or move this use into an approved fixture scope; " +
+					"fixture entries are not approved for production Go code or skills"
+			}
+			out = append(out, lintapi.Violation{
+				Rule:   unapprovedDomainRule,
+				Action: lintapi.ActionReject,
+				File:   rel,
+				Line:   line,
+				Message: fmt.Sprintf(
+					"unapproved hostname %q found in %s",
+					evidence.Host,
+					evidence.Kind,
+				),
+				Suggestion: suggestion,
+			})
+		}
+	}
+
+	// A syntax error is also surfaced by go/packages. Prefer the file-specific
+	// parse diagnostic when one was already reported; otherwise make a
+	// repository-wide type-loading failure explicit instead of silently
+	// continuing without the type information required by field evidence.
+	if typeLoadErr != nil && !parseFailureReported && !typeInfoGapReported {
+		out = append(out, incompleteDomainViolation("go.mod", typeLoadErr))
+	}
+
+	if inventoryComplete {
+		for host, entry := range policy.Public {
+			if !observedPublic[host] {
+				out = append(out, unusedDomainViolation(entry))
+			}
+		}
+		for host, entry := range policy.Fixtures {
+			if !observedFixtures[host] {
+				out = append(out, unusedDomainViolation(entry))
+			}
+		}
+	}
+	return out, nil
+}
+
+func trackedGoFiles(root string) ([]string, error) {
+	out, err := gitCommandOutput(root, "ls-files", "-z", "--", "*.go")
+	if err != nil {
+		return nil, fmt.Errorf("list tracked Go files: %w", err)
+	}
+	var files []string
+	for _, raw := range strings.Split(string(out), "\x00") {
+		if raw == "" {
+			continue
+		}
+		rel := filepath.ToSlash(raw)
+		if strings.HasPrefix(rel, "vendor/") || strings.HasPrefix(rel, "node_modules/") {
+			continue
+		}
+		files = append(files, rel)
+	}
+	return files, nil
+}
+
+func loadTypedGoFiles(root string) (map[string]typedGoFile, error) {
+	moduleDirs, err := trackedGoModuleDirs(root)
+	if err != nil {
+		return nil, err
+	}
+	out := map[string]typedGoFile{}
+	var firstLoadErr error
+	var loadErrCount int
+	for _, moduleDir := range moduleDirs {
+		moduleRoot := root
+		if moduleDir != "." {
+			moduleRoot = filepath.Join(root, filepath.FromSlash(moduleDir))
+		}
+		files, err := loadTypedGoModule(moduleRoot)
+		for path, file := range files {
+			out[path] = file
+		}
+		if err != nil {
+			loadErrCount++
+			if firstLoadErr == nil {
+				firstLoadErr = err
+			}
+		}
+	}
+	if loadErrCount == 1 {
+		return out, firstLoadErr
+	}
+	if loadErrCount > 1 {
+		return out, fmt.Errorf("%w (and %d more module errors)", firstLoadErr, loadErrCount-1)
+	}
+	return out, nil
+}
+
+func trackedGoModuleDirs(root string) ([]string, error) {
+	raw, err := gitCommandOutput(root, "ls-files", "-z")
+	if err != nil {
+		return nil, fmt.Errorf("list tracked Go modules: %w", err)
+	}
+	var dirs []string
+	for _, path := range strings.Split(string(raw), "\x00") {
+		path = filepath.ToSlash(path)
+		if path != "go.mod" && !strings.HasSuffix(path, "/go.mod") {
+			continue
+		}
+		dir := filepath.ToSlash(filepath.Dir(path))
+		dirs = append(dirs, dir)
+	}
+	return dirs, nil
+}
+
+func loadTypedGoModule(moduleRoot string) (map[string]typedGoFile, error) {
+	fset := token.NewFileSet()
+	cfg := &packages.Config{
+		Mode: packages.NeedName |
+			packages.NeedFiles |
+			packages.NeedCompiledGoFiles |
+			packages.NeedImports |
+			packages.NeedDeps |
+			packages.NeedTypes |
+			packages.NeedSyntax |
+			packages.NeedTypesInfo,
+		Dir:   moduleRoot,
+		Fset:  fset,
+		Tests: true,
+	}
+	pkgs, err := packages.Load(cfg, "./...")
+	if err != nil {
+		return nil, fmt.Errorf("load Go type information: %w", err)
+	}
+	out := map[string]typedGoFile{}
+	var firstPackageErr string
+	var packageErrCount int
+	packages.Visit(pkgs, nil, func(pkg *packages.Package) {
+		if pkg == nil {
+			return
+		}
+		for _, pkgErr := range pkg.Errors {
+			packageErrCount++
+			if firstPackageErr == "" {
+				firstPackageErr = pkgErr.Error()
+			}
+		}
+		if pkg.TypesInfo == nil || pkg.Fset == nil {
+			return
+		}
+		for i, file := range pkg.Syntax {
+			if i >= len(pkg.CompiledGoFiles) {
+				break
+			}
+			path := filepath.Clean(pkg.CompiledGoFiles[i])
+			if _, exists := out[path]; exists {
+				continue
+			}
+			out[path] = typedGoFile{File: file, Fset: pkg.Fset, Info: pkg.TypesInfo}
+		}
+	})
+	if packageErrCount == 1 {
+		return out, fmt.Errorf("load Go type information: %s", firstPackageErr)
+	}
+	if packageErrCount > 1 {
+		return out, fmt.Errorf(
+			"load Go type information: %s (and %d more package errors)",
+			firstPackageErr,
+			packageErrCount-1,
+		)
+	}
+	return out, nil
+}
+
+func newFileDomainScan(file typedGoFile) *fileDomainScan {
+	return &fileDomainScan{
+		File:    file.File,
+		Fset:    file.Fset,
+		Info:    file.Info,
+		seen:    map[evidenceKey]bool{},
+		parents: astParentMap(file.File),
+	}
+}
+
+func (s *fileDomainScan) collectSemanticEvidence() {
+	ast.Inspect(s.File, func(node ast.Node) bool {
+		switch n := node.(type) {
+		case *ast.AssignStmt:
+			if len(n.Lhs) != len(n.Rhs) {
+				return true
+			}
+			for i, lhs := range n.Lhs {
+				if s.Info == nil &&
+					potentialHostnameSelectorTarget(lhs) &&
+					s.hasStaticBareHostnameValue(n.Rhs[i]) {
+					s.requireTypeInfo(n.Rhs[i])
+				}
+				if index, ok := stripParens(lhs).(*ast.IndexExpr); ok {
+					switch {
+					case s.isHostnameTarget(index.X):
+						s.addMapPair(index.Index, n.Rhs[i])
+					case s.isHostnameMapKey(index.Index):
+						s.addHostValue(n.Rhs[i], "host assignment")
+					}
+					continue
+				}
+				if s.isHostnameTarget(lhs) {
+					s.addHostValue(n.Rhs[i], "host assignment")
+				}
+			}
+		case *ast.ValueSpec:
+			if len(n.Names) != len(n.Values) {
+				return true
+			}
+			for i, name := range n.Names {
+				if isHostnameSemanticName(name.Name) {
+					s.addHostValue(n.Values[i], "host assignment")
+				}
+			}
+		case *ast.KeyValueExpr:
+			if s.Info == nil && s.keyValueNeedsTypeInfo(n) {
+				s.requireTypeInfo(n.Value)
+			}
+			if s.isHostnameKeyValue(n) {
+				s.addHostValue(n.Value, "host assignment")
+			}
+		}
+		return true
+	})
+}
+
+func (s *fileDomainScan) requireTypeInfo(expr ast.Expr) {
+	for _, existing := range s.TypeInfoRequired {
+		if existing.Pos() == expr.Pos() && existing.End() == expr.End() {
+			return
+		}
+	}
+	s.TypeInfoRequired = append(s.TypeInfoRequired, expr)
+}
+
+func (s *fileDomainScan) hasStaticBareHostnameValue(expr ast.Expr) bool {
+	value, ok := staticStringValue(expr, s.Info, nil)
+	if !ok {
+		return false
+	}
+	host, ok := semanticHostname(value)
+	return ok && !isReservedExampleHostname(host)
+}
+
+func (s *fileDomainScan) keyValueNeedsTypeInfo(pair *ast.KeyValueExpr) bool {
+	composite, ok := s.parents[pair].(*ast.CompositeLit)
+	if !ok {
+		return false
+	}
+	if _, explicitMap := composite.Type.(*ast.MapType); explicitMap {
+		return false
+	}
+	key, ok := pair.Key.(*ast.Ident)
+	return ok && isHostnameSemanticName(key.Name) && s.hasStaticBareHostnameValue(pair.Value)
+}
+
+func potentialHostnameSelectorTarget(expr ast.Expr) bool {
+	switch n := stripParens(expr).(type) {
+	case *ast.SelectorExpr:
+		return isHostnameSemanticName(n.Sel.Name)
+	case *ast.StarExpr:
+		return potentialHostnameSelectorTarget(n.X)
+	case *ast.IndexExpr:
+		return potentialHostnameSelectorTarget(n.X)
+	default:
+		return false
+	}
+}
+
+func (s *fileDomainScan) collectAbsoluteURLEvidence() {
+	ast.Inspect(s.File, func(node ast.Node) bool {
+		expr, ok := node.(ast.Expr)
+		if !ok {
+			return true
+		}
+		if ident, ok := expr.(*ast.Ident); ok && s.Info != nil && s.Info.Defs[ident] != nil {
+			// A declaration name may carry the constant value in types.Info,
+			// but it is not a second source expression.
+			return true
+		}
+		value, ok := staticStringValue(expr, s.Info, nil)
+		if !ok {
+			return true
+		}
+		if s.hasStaticStringContainer(expr) {
+			return true
+		}
+		host, ok := absoluteURLHostname(value)
+		if ok {
+			s.addEvidence(host, "absolute URL", expr)
+		}
+		return true
+	})
+}
+
+func (s *fileDomainScan) hasStaticStringContainer(expr ast.Expr) bool {
+	parent, ok := s.parents[expr].(ast.Expr)
+	if !ok {
+		return false
+	}
+	switch parent.(type) {
+	case *ast.BinaryExpr, *ast.ParenExpr:
+		_, ok := staticStringValue(parent, s.Info, nil)
+		return ok
+	default:
+		return false
+	}
+}
+
+func (s *fileDomainScan) addHostValue(expr ast.Expr, kind string) {
+	expr = stripParens(expr)
+	if composite, ok := expr.(*ast.CompositeLit); ok {
+		switch s.collectionCompositeKind(composite) {
+		case sequenceComposite:
+			for _, element := range composite.Elts {
+				if valueExpr, ok := element.(ast.Expr); ok {
+					s.addHostValue(valueExpr, "host collection")
+				}
+			}
+		case mapComposite:
+			for _, element := range composite.Elts {
+				pair, ok := element.(*ast.KeyValueExpr)
+				if !ok {
+					continue
+				}
+				keyExpr, ok := pair.Key.(ast.Expr)
+				if !ok {
+					continue
+				}
+				s.addMapPair(keyExpr, pair.Value)
+			}
+		default:
+			if s.Info == nil {
+				s.requireTypeInfoForUnclassifiedCollection(composite)
+			}
+			return
+		}
+		return
+	}
+	if evidence, ok := s.hostnameEvidence(expr, kind); ok {
+		s.addEvidence(evidence.Host, evidence.Kind, evidence.Expr)
+	}
+}
+
+func (s *fileDomainScan) requireTypeInfoForUnclassifiedCollection(composite *ast.CompositeLit) {
+	for _, element := range composite.Elts {
+		if pair, ok := element.(*ast.KeyValueExpr); ok {
+			keyExpr, ok := pair.Key.(ast.Expr)
+			if !ok {
+				continue
+			}
+			keyIsHost := s.hasStaticBareHostnameValue(keyExpr)
+			valueIsHost := s.hasStaticBareHostnameValue(pair.Value)
+			if keyIsHost == valueIsHost {
+				continue
+			}
+			if keyIsHost {
+				s.requireTypeInfo(keyExpr)
+			} else {
+				s.requireTypeInfo(pair.Value)
+			}
+			continue
+		}
+		valueExpr, ok := element.(ast.Expr)
+		if ok && s.hasStaticBareHostnameValue(valueExpr) {
+			s.requireTypeInfo(valueExpr)
+		}
+	}
+}
+
+// addMapPair reports a map side only when it is the sole hostname-shaped
+// static value. A semantic map name does not establish whether a string map
+// is hostname->metadata or alias->hostname, so reporting both sides would turn
+// filenames such as client.pem into blocking hostname evidence.
+func (s *fileDomainScan) addMapPair(key, value ast.Expr) {
+	keyEvidence, keyOK := s.hostnameEvidence(key, "host collection")
+	valueEvidence, valueOK := s.hostnameEvidence(value, "host collection")
+	if keyOK == valueOK {
+		return
+	}
+	if keyOK {
+		s.addEvidence(keyEvidence.Host, keyEvidence.Kind, keyEvidence.Expr)
+		return
+	}
+	s.addEvidence(valueEvidence.Host, valueEvidence.Kind, valueEvidence.Expr)
+}
+
+func (s *fileDomainScan) hostnameEvidence(expr ast.Expr, kind string) (domainEvidence, bool) {
+	expr = stripParens(expr)
+	value, ok := staticStringValue(expr, s.Info, nil)
+	if !ok {
+		return domainEvidence{}, false
+	}
+	if host, ok := absoluteURLHostname(value); ok {
+		return domainEvidence{Host: host, Kind: "absolute URL", Expr: expr}, true
+	}
+	if host, ok := semanticHostname(value); ok {
+		return domainEvidence{Host: host, Kind: kind, Expr: expr}, true
+	}
+	return domainEvidence{}, false
+}
+
+func (s *fileDomainScan) collectionCompositeKind(expr *ast.CompositeLit) collectionCompositeKind {
+	if s.Info != nil {
+		if tv, ok := s.Info.Types[expr]; ok && tv.Type != nil {
+			switch tv.Type.Underlying().(type) {
+			case *types.Array, *types.Slice:
+				return sequenceComposite
+			case *types.Map:
+				return mapComposite
+			}
+		}
+	}
+	switch expr.Type.(type) {
+	case *ast.ArrayType:
+		return sequenceComposite
+	case *ast.MapType:
+		return mapComposite
+	default:
+		return notCollectionComposite
+	}
+}
+
+func (s *fileDomainScan) addEvidence(host, kind string, expr ast.Expr) {
+	key := evidenceKey{Host: host, Start: expr.Pos(), End: expr.End()}
+	if s.seen[key] {
+		return
+	}
+	s.seen[key] = true
+	s.Evidence = append(s.Evidence, domainEvidence{Host: host, Kind: kind, Expr: expr})
+}
+
+func staticStringValue(expr ast.Expr, info *types.Info, seen map[*ast.Object]bool) (string, bool) {
+	if info != nil {
+		if tv, ok := info.Types[expr]; ok && tv.Value != nil && tv.Value.Kind() == constant.String {
+			return constant.StringVal(tv.Value), true
+		}
+	}
+	switch n := expr.(type) {
+	case *ast.BasicLit:
+		if n.Kind != token.STRING {
+			return "", false
+		}
+		value, err := strconv.Unquote(n.Value)
+		return value, err == nil
+	case *ast.ParenExpr:
+		return staticStringValue(n.X, info, seen)
+	case *ast.BinaryExpr:
+		if n.Op != token.ADD {
+			return "", false
+		}
+		left, ok := staticStringValue(n.X, info, seen)
+		if !ok {
+			return "", false
+		}
+		right, ok := staticStringValue(n.Y, info, seen)
+		if !ok {
+			return "", false
+		}
+		return left + right, true
+	case *ast.Ident:
+		if info != nil {
+			if obj := info.ObjectOf(n); obj != nil {
+				if c, ok := obj.(*types.Const); ok {
+					if c.Val().Kind() == constant.String {
+						return constant.StringVal(c.Val()), true
+					}
+				}
+			}
+		}
+		if n.Obj == nil || n.Obj.Kind != ast.Con {
+			return "", false
+		}
+		if seen == nil {
+			seen = map[*ast.Object]bool{}
+		}
+		if seen[n.Obj] {
+			return "", false
+		}
+		seen[n.Obj] = true
+		defer delete(seen, n.Obj)
+		spec, ok := n.Obj.Decl.(*ast.ValueSpec)
+		if !ok {
+			return "", false
+		}
+		for i, name := range spec.Names {
+			if name.Name == n.Name && i < len(spec.Values) {
+				return staticStringValue(spec.Values[i], info, seen)
+			}
+		}
+	}
+	return "", false
+}
+
+func absoluteURLHostname(value string) (string, bool) {
+	value = strings.TrimSpace(value)
+	parsed, err := url.Parse(value)
+	if err != nil || parsed.Host == "" {
+		return "", false
+	}
+	switch strings.ToLower(parsed.Scheme) {
+	case "http", "https", "ws", "wss":
+	default:
+		return "", false
+	}
+	return normalizeCandidateHostname(parsed.Hostname())
+}
+
+func semanticHostname(value string) (string, bool) {
+	value = strings.TrimSpace(value)
+	if value == "" || strings.ContainsAny(value, `/\?#@`) || strings.ContainsAny(value, " \t\r\n") {
+		return "", false
+	}
+	parsed, err := url.Parse("//" + value)
+	if err != nil || parsed.Host == "" || parsed.Path != "" {
+		return "", false
+	}
+	return normalizeCandidateHostname(parsed.Hostname())
+}
+
+func normalizeCandidateHostname(host string) (string, bool) {
+	host = strings.TrimSuffix(strings.ToLower(strings.TrimSpace(host)), ".")
+	if host == "" || !strings.Contains(host, ".") || net.ParseIP(host) != nil {
+		return "", false
+	}
+	labels := strings.Split(host, ".")
+	for _, label := range labels {
+		if label == "" || strings.HasPrefix(label, "-") || strings.HasSuffix(label, "-") {
+			return "", false
+		}
+		for _, r := range label {
+			if unicode.IsLetter(r) || unicode.IsDigit(r) || r == '-' {
+				continue
+			}
+			return "", false
+		}
+	}
+	return host, true
+}
+
+func (s *fileDomainScan) isHostnameTarget(expr ast.Expr) bool {
+	switch n := stripParens(expr).(type) {
+	case *ast.Ident:
+		return isHostnameSemanticName(n.Name)
+	case *ast.SelectorExpr:
+		return s.isHostnameSelector(n)
+	case *ast.StarExpr:
+		return s.isHostnameTarget(n.X)
+	default:
+		return false
+	}
+}
+
+func (s *fileDomainScan) isHostnameKeyValue(pair *ast.KeyValueExpr) bool {
+	composite, ok := s.parents[pair].(*ast.CompositeLit)
+	if !ok {
+		return false
+	}
+	switch s.collectionCompositeKind(composite) {
+	case mapComposite:
+		key, ok := pair.Key.(ast.Expr)
+		return ok && s.isHostnameMapKey(key)
+	case notCollectionComposite:
+		ident, ok := pair.Key.(*ast.Ident)
+		return ok && s.isHostnameStructField(composite, ident.Name)
+	default:
+		return false
+	}
+}
+
+func (s *fileDomainScan) isHostnameMapKey(expr ast.Expr) bool {
+	value, ok := staticStringValue(expr, s.Info, nil)
+	return ok && isHostnameSemanticName(value)
+}
+
+func (s *fileDomainScan) isHostnameSelector(selector *ast.SelectorExpr) bool {
+	if s.Info == nil || !isHostnameSemanticName(selector.Sel.Name) {
+		return false
+	}
+	selection := s.Info.Selections[selector]
+	if selection == nil || selection.Kind() != types.FieldVal {
+		return false
+	}
+	return !nonNetworkHostnameFields[hostnameFieldID{
+		Type:  namedTypeID(selection.Recv()),
+		Field: selector.Sel.Name,
+	}]
+}
+
+func (s *fileDomainScan) isHostnameStructField(composite *ast.CompositeLit, field string) bool {
+	if s.Info == nil || !isHostnameSemanticName(field) {
+		return false
+	}
+	typeID := namedTypeID(s.Info.TypeOf(composite))
+	if typeID == "" {
+		return false
+	}
+	return !nonNetworkHostnameFields[hostnameFieldID{Type: typeID, Field: field}]
+}
+
+func namedTypeID(typ types.Type) string {
+	for {
+		switch t := typ.(type) {
+		case *types.Pointer:
+			typ = t.Elem()
+		case *types.Named:
+			obj := t.Obj()
+			if obj == nil || obj.Pkg() == nil {
+				return ""
+			}
+			return obj.Pkg().Path() + "." + obj.Name()
+		default:
+			return ""
+		}
+	}
+}
+
+func isHostnameSemanticName(name string) bool {
+	lower := strings.ToLower(name)
+	switch lower {
+	case "host", "hosts", "hostname", "hostnames", "domain", "domains":
+		return true
+	}
+	for _, marker := range []string{
+		"HostBy", "HostsBy", "HostnameBy", "HostnamesBy", "DomainBy", "DomainsBy",
+	} {
+		if i := strings.Index(name, marker); i >= 0 {
+			end := i + len(marker)
+			if end < len(name) && unicode.IsUpper(rune(name[end])) {
+				return true
+			}
+		}
+	}
+	for _, prefix := range []string{
+		"hostBy", "hostsBy", "hostnameBy", "hostnamesBy", "domainBy", "domainsBy",
+	} {
+		if strings.HasPrefix(name, prefix) &&
+			len(name) > len(prefix) &&
+			unicode.IsUpper(rune(name[len(prefix)])) {
+			return true
+		}
+	}
+	if i := strings.LastIndexAny(name, "_-"); i >= 0 {
+		return isHostnameSemanticName(name[i+1:])
+	}
+	for _, suffix := range []string{"Hostnames", "Hostname", "Domains", "Domain", "Hosts", "Host"} {
+		if strings.HasSuffix(name, suffix) && len(name) > len(suffix) {
+			return true
+		}
+	}
+	return false
+}
+
+func stripParens(expr ast.Expr) ast.Expr {
+	for {
+		paren, ok := expr.(*ast.ParenExpr)
+		if !ok {
+			return expr
+		}
+		expr = paren.X
+	}
+}
+
+func astParentMap(root ast.Node) map[ast.Node]ast.Node {
+	parents := map[ast.Node]ast.Node{}
+	var stack []ast.Node
+	ast.Inspect(root, func(node ast.Node) bool {
+		if node == nil {
+			stack = stack[:len(stack)-1]
+			return false
+		}
+		if len(stack) > 0 {
+			parents[node] = stack[len(stack)-1]
+		}
+		stack = append(stack, node)
+		return true
+	})
+	return parents
+}
+
+func isDomainFixturePath(rel string) bool {
+	rel = filepath.ToSlash(rel)
+	if strings.HasPrefix(rel, "skills/") {
+		return false
+	}
+	if strings.HasSuffix(rel, "_test.go") || strings.HasPrefix(rel, "tests/") {
+		return true
+	}
+	for _, part := range strings.Split(rel, "/") {
+		if part == "testdata" {
+			return true
+		}
+	}
+	return false
+}
+
+func unusedDomainViolation(entry domainPolicyEntry) lintapi.Violation {
+	return lintapi.Violation{
+		Rule:       unusedDomainRule,
+		Action:     lintapi.ActionReject,
+		File:       entry.File,
+		Line:       entry.Line,
+		Message:    fmt.Sprintf("domain allowlist entry %q has no in-scope Go reference", entry.Host),
+		Suggestion: "remove the unused entry; allowlist entries must be justified by a current in-scope reference",
+	}
+}
+
+func incompleteDomainViolation(file string, err error) lintapi.Violation {
+	return incompleteDomainViolationAt(file, 1, err)
+}
+
+func incompleteDomainViolationAt(file string, line int, err error) lintapi.Violation {
+	return lintapi.Violation{
+		Rule:       incompleteDomainRule,
+		Action:     lintapi.ActionReject,
+		File:       file,
+		Line:       line,
+		Message:    "domain scan incomplete: " + err.Error(),
+		Suggestion: "fix the Go parse or type-loading error so hostname analysis can complete",
+	}
+}

lint/domaincontract/unapproved_repo_test.go

@@ -0,0 +1,462 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package domaincontract
+
+import (
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"github.com/larksuite/cli/lint/lintapi"
+)
+
+func gitTestCommand(t *testing.T, root string, args ...string) string {
+	t.Helper()
+	cmd := exec.Command("git", args...)
+	cmd.Dir = root
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("git %s: %v\n%s", strings.Join(args, " "), err, out)
+	}
+	return strings.TrimSpace(string(out))
+}
+
+func setupDomainDiffRepo(t *testing.T, target string) (root, base string) {
+	t.Helper()
+	root = t.TempDir()
+	writeFile(t, root, "go.mod", "module example.com/domainfixture\n\ngo 1.23.0\n")
+	writeFile(t, root, publicDomainsPath, "# public\npublic.example.com\n")
+	writeFile(t, root, fixtureDomainsPath, "# fixtures\nfixture.example.com\n")
+	writeFile(t, root, "policy_refs.go", "package sample\n\nvar APIHost = \"public.example.com\"\n")
+	writeFile(t, root, "policy_refs_test.go", "package sample\n\nvar FixtureHost = \"fixture.example.com\"\n")
+	writeFile(t, root, "target.go", target)
+
+	gitTestCommand(t, root, "init", "-q")
+	gitTestCommand(t, root, "config", "user.name", "Domain Contract Test")
+	gitTestCommand(t, root, "config", "user.email", "domain-contract@example.com")
+	gitTestCommand(t, root, "add", ".")
+	gitTestCommand(t, root, "-c", "commit.gpgsign=false", "commit", "-qm", "base")
+	return root, gitTestCommand(t, root, "rev-parse", "HEAD")
+}
+
+func commitDomainDiff(t *testing.T, root, message string) {
+	t.Helper()
+	gitTestCommand(t, root, "add", "-A")
+	gitTestCommand(t, root, "-c", "commit.gpgsign=false", "commit", "-qm", message)
+}
+
+func violationsForRule(vs []lintapi.Violation, rule string) []lintapi.Violation {
+	var out []lintapi.Violation
+	for _, v := range vs {
+		if v.Rule == rule {
+			out = append(out, v)
+		}
+	}
+	return out
+}
+
+func scanDomainDiff(t *testing.T, root, base string) []lintapi.Violation {
+	t.Helper()
+	vs, err := ScanRepoWithOptions(root, ScanOptions{ChangedFrom: base})
+	if err != nil {
+		t.Fatal(err)
+	}
+	return vs
+}
+
+func TestUnapprovedDomainDiffContract(t *testing.T) {
+	t.Run("new PR 1975 case", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nvar unrelated = 1\nvar APIHost = \"internal-api-drive-stream.larkoffice.com\"\n")
+		commitDomainDiff(t, root, "add internal host")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "internal-api-drive-stream.larkoffice.com") {
+			t.Fatalf("violations = %+v, want PR 1975 hostname", got)
+		}
+	})
+
+	t.Run("hostname field in nested Go module", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "nested/go.mod", "module example.com/nested\n\ngo 1.23.0\n")
+		writeFile(t, root, "nested/target.go",
+			"package nested\n\ntype Config struct{ Host string }\n\n"+
+				"var config = Config{Host: \"private.corp.internal\"}\n")
+		commitDomainDiff(t, root, "add nested module hostname")
+
+		all := scanDomainDiff(t, root, base)
+		got := violationsForRule(all, unapprovedDomainRule)
+		if len(got) != 1 || filepath.ToSlash(got[0].File) != "nested/target.go" ||
+			!strings.Contains(got[0].Message, "private.corp.internal") {
+			t.Fatalf("violations = %+v, want nested-module hostname rejection", got)
+		}
+		if incomplete := violationsForRule(all, incompleteDomainRule); len(incomplete) != 0 {
+			t.Fatalf("nested module must have complete type information: %+v", incomplete)
+		}
+	})
+
+	t.Run("changed excluded field reports incomplete scan", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "excluded.go",
+			"//go:build domaincontract_never && !domaincontract_never\n\npackage sample\n\n"+
+				"type Config struct{ Host string }\n\n"+
+				"var config = Config{Host: \"private.corp.internal\"}\n")
+		commitDomainDiff(t, root, "add excluded hostname field")
+
+		all := scanDomainDiff(t, root, base)
+		got := violationsForRule(all, incompleteDomainRule)
+		if len(got) != 1 || filepath.Base(got[0].File) != "excluded.go" || got[0].Line != 7 {
+			t.Fatalf("violations = %+v, want changed field scan-incomplete at line 7", got)
+		}
+		if unapproved := violationsForRule(all, unapprovedDomainRule); len(unapproved) != 0 {
+			t.Fatalf("untyped field must not produce an unverified hostname finding: %+v", unapproved)
+		}
+	})
+
+	t.Run("changed excluded selector reports incomplete scan", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "excluded.go",
+			"//go:build domaincontract_never && !domaincontract_never\n\npackage sample\n\n"+
+				"type Config struct{ Host string }\n\n"+
+				"func configure(config *Config) { config.Host = \"private.corp.internal\" }\n")
+		commitDomainDiff(t, root, "add excluded hostname selector")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), incompleteDomainRule)
+		if len(got) != 1 || filepath.Base(got[0].File) != "excluded.go" || got[0].Line != 7 {
+			t.Fatalf("violations = %+v, want changed selector scan-incomplete at line 7", got)
+		}
+	})
+
+	t.Run("changed excluded named slice reports incomplete scan", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "excluded.go",
+			"//go:build domaincontract_never && !domaincontract_never\n\npackage sample\n\n"+
+				"type HostList []string\n\n"+
+				"var AllowedHosts = HostList{\n\t\"attacker.zip\",\n}\n")
+		commitDomainDiff(t, root, "add excluded hostname slice")
+
+		all := scanDomainDiff(t, root, base)
+		got := violationsForRule(all, incompleteDomainRule)
+		if len(got) != 1 || filepath.Base(got[0].File) != "excluded.go" || got[0].Line != 8 {
+			t.Fatalf("violations = %+v, want named-slice scan-incomplete at line 8", got)
+		}
+		if unapproved := violationsForRule(all, unapprovedDomainRule); len(unapproved) != 0 {
+			t.Fatalf("untyped named slice must not produce an unverified hostname finding: %+v", unapproved)
+		}
+	})
+
+	t.Run("changed excluded named map reports incomplete scan", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "excluded.go",
+			"//go:build domaincontract_never && !domaincontract_never\n\npackage sample\n\n"+
+				"type HostSet map[string]struct{}\n\n"+
+				"var AllowedHosts = HostSet{\n\t\"attacker.zip\": {},\n}\n")
+		commitDomainDiff(t, root, "add excluded hostname map")
+
+		all := scanDomainDiff(t, root, base)
+		got := violationsForRule(all, incompleteDomainRule)
+		if len(got) != 1 || filepath.Base(got[0].File) != "excluded.go" || got[0].Line != 8 {
+			t.Fatalf("violations = %+v, want named-map scan-incomplete at line 8", got)
+		}
+		if unapproved := violationsForRule(all, unapprovedDomainRule); len(unapproved) != 0 {
+			t.Fatalf("untyped named map must not produce an unverified hostname finding: %+v", unapproved)
+		}
+	})
+
+	t.Run("changed excluded unrelated code stays allowed", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "excluded.go",
+			"//go:build domaincontract_never && !domaincontract_never\n\npackage sample\n\nvar unrelated = 2\n")
+		commitDomainDiff(t, root, "add excluded unrelated code")
+
+		if got := violationsForRule(scanDomainDiff(t, root, base), incompleteDomainRule); len(got) != 0 {
+			t.Fatalf("unrelated excluded code must not require hostname type information: %+v", got)
+		}
+	})
+
+	t.Run("new element in existing collection", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t,
+			"package sample\n\nvar ExtraHosts = []string{\n\t\"public.example.com\",\n}\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nvar ExtraHosts = []string{\n\t\"public.example.com\",\n\t\"attacker.zip\",\n}\n")
+		commitDomainDiff(t, root, "add collection host")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "attacker.zip") {
+			t.Fatalf("violations = %+v, want attacker.zip", got)
+		}
+		if got[0].Line != 5 {
+			t.Fatalf("violation line = %d, want 5", got[0].Line)
+		}
+	})
+
+	t.Run("multiline expression changed segment", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t,
+			"package sample\n\nvar ExtraHost = \"private.corp.\" +\n\t\"example.com\"\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nvar ExtraHost = \"private.corp.\" +\n\t\"internal\"\n")
+		commitDomainDiff(t, root, "change concatenated host")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "private.corp.internal") {
+			t.Fatalf("violations = %+v, want private.corp.internal", got)
+		}
+		if got[0].Line != 4 {
+			t.Fatalf("violation line = %d, want changed line 4", got[0].Line)
+		}
+	})
+
+	t.Run("unrelated change beside historical hostname", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t,
+			"package sample\n\nvar HistoricalHost = \"historical.private.internal\"\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nvar HistoricalHost = \"historical.private.internal\"\nvar unrelated = 1\n")
+		commitDomainDiff(t, root, "add unrelated value")
+
+		if got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule); len(got) != 0 {
+			t.Fatalf("unexpected historical-domain violation: %+v", got)
+		}
+	})
+
+	t.Run("historical hostname expression changed", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t,
+			"package sample\n\nvar HistoricalHost = \"historical.private.internal\"\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nvar HistoricalHost = \"replacement.private.internal\"\n")
+		commitDomainDiff(t, root, "change historical host")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "replacement.private.internal") {
+			t.Fatalf("violations = %+v, want replacement.private.internal", got)
+		}
+	})
+
+	t.Run("new assignment references existing constant", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t,
+			"package sample\n\nconst existingConst = \"private.corp.internal\"\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nconst existingConst = \"private.corp.internal\"\nvar APIHost = existingConst\n")
+		commitDomainDiff(t, root, "use existing hostname constant")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "private.corp.internal") {
+			t.Fatalf("violations = %+v, want private.corp.internal", got)
+		}
+		if got[0].Line != 4 {
+			t.Fatalf("violation line = %d, want 4", got[0].Line)
+		}
+	})
+
+	t.Run("allowlisted hostname", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nvar unrelated = 1\nvar BackupHost = \"public.example.com\"\n")
+		commitDomainDiff(t, root, "add public host")
+
+		if got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule); len(got) != 0 {
+			t.Fatalf("unexpected public-domain violation: %+v", got)
+		}
+	})
+
+	t.Run("reserved example URL", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nvar unrelated = 1\nfunc fakeValue() string { return \"https://example.test/resource\" }\n")
+		commitDomainDiff(t, root, "add safe example URL")
+
+		if got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule); len(got) != 0 {
+			t.Fatalf("unexpected reserved-example violation: %+v", got)
+		}
+	})
+
+	t.Run("historical type gap suppresses unused policy diagnostics", func(t *testing.T) {
+		root, _ := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, publicDomainsPath,
+			"# public\nplatform.example.com\npublic.example.com\n")
+		writeFile(t, root, "excluded.go",
+			"//go:build domaincontract_never && !domaincontract_never\n\npackage sample\n\n"+
+				"type Config struct{ Host string }\n\n"+
+				"var config = Config{Host: \"platform.example.com\"}\n")
+		commitDomainDiff(t, root, "add historical platform hostname")
+		base := gitTestCommand(t, root, "rev-parse", "HEAD")
+
+		writeFile(t, root, "target.go", "package sample\n\nvar unrelated = 2\n")
+		commitDomainDiff(t, root, "change unrelated code")
+
+		all := scanDomainDiff(t, root, base)
+		if got := violationsForRule(all, incompleteDomainRule); len(got) != 0 {
+			t.Fatalf("historical type gap must not be attributed to this change: %+v", got)
+		}
+		if got := violationsForRule(all, unusedDomainRule); len(got) != 0 {
+			t.Fatalf("incomplete inventory must not produce unused-policy diagnostics: %+v", got)
+		}
+	})
+
+	t.Run("allowlist does not approve subdomains", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nvar unrelated = 1\nvar BackupHost = \"evil.public.example.com\"\n")
+		commitDomainDiff(t, root, "add unapproved public subdomain")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "evil.public.example.com") {
+			t.Fatalf("violations = %+v, want evil.public.example.com", got)
+		}
+	})
+
+	t.Run("multi assignment pairs names and values", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, publicDomainsPath,
+			"# public\nopen.larksuite.com\npublic.example.com\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nvar unrelated = 1\nvar APIHost, BackupHost = \"open.larksuite.com\", \"attacker.zip\"\n")
+		commitDomainDiff(t, root, "add multiple hosts")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "attacker.zip") {
+			t.Fatalf("violations = %+v, want only attacker.zip", got)
+		}
+	})
+
+	t.Run("IDN hostname is rejected", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nvar unrelated = 1\nvar BackupHost = \"例子.公司.cn\"\n")
+		commitDomainDiff(t, root, "add IDN hostname")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "例子.公司.cn") {
+			t.Fatalf("violations = %+v, want IDN hostname", got)
+		}
+	})
+
+	t.Run("fixture limited to test files", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nvar unrelated = 1\nvar ProductionHost = \"fixture.example.com\"\n")
+		commitDomainDiff(t, root, "use fixture in production")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "fixture.example.com") {
+			t.Fatalf("violations = %+v, want production fixture rejection", got)
+		}
+		if !strings.Contains(got[0].Suggestion, "fixture-only hostname") ||
+			strings.Contains(got[0].Suggestion, "public allowlist") {
+			t.Fatalf("suggestion = %q, want fixture-scope guidance", got[0].Suggestion)
+		}
+	})
+
+	t.Run("fixture accepted in test file", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "new_target_test.go",
+			"package sample\n\nvar BackupHost = \"fixture.example.com\"\n")
+		commitDomainDiff(t, root, "use fixture in test")
+
+		if got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule); len(got) != 0 {
+			t.Fatalf("unexpected fixture-domain violation: %+v", got)
+		}
+	})
+
+	t.Run("fixture allowlist does not approve subdomains", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "new_target_test.go",
+			"package sample\n\nvar BackupHost = \"evil.fixture.example.com\"\n")
+		commitDomainDiff(t, root, "use unapproved fixture subdomain")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "evil.fixture.example.com") {
+			t.Fatalf("violations = %+v, want exact fixture match", got)
+		}
+	})
+
+	t.Run("fixture rejected in skills", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "skills/example/example_test.go",
+			"package example\n\nvar BackupHost = \"fixture.example.com\"\n")
+		commitDomainDiff(t, root, "use fixture in skill")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "fixture.example.com") {
+			t.Fatalf("violations = %+v, want skill fixture rejection", got)
+		}
+	})
+
+	t.Run("pure rename", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t,
+			"package sample\n\nvar HistoricalHost = \"historical.private.internal\"\n")
+		gitTestCommand(t, root, "mv", "target.go", "renamed.go")
+		commitDomainDiff(t, root, "rename file")
+
+		if got := violationsForRule(scanDomainDiff(t, root, base), unapprovedDomainRule); len(got) != 0 {
+			t.Fatalf("unexpected rename violation: %+v", got)
+		}
+	})
+}
+
+func TestUnapprovedDomainPolicyAndFailurePaths(t *testing.T) {
+	t.Run("unused policy entry", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, publicDomainsPath,
+			"# public\npublic.example.com\nunused.example.com\n")
+		commitDomainDiff(t, root, "add unused policy")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unusedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "unused.example.com") {
+			t.Fatalf("violations = %+v, want unused.example.com", got)
+		}
+	})
+
+	t.Run("public entry used only by fixture", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, publicDomainsPath,
+			"# public\npublic.example.com\ntest-only.example.com\n")
+		writeFile(t, root, "public_only_test.go",
+			"package sample\n\nvar BackupHost = \"test-only.example.com\"\n")
+		commitDomainDiff(t, root, "add test-only public policy")
+
+		got := violationsForRule(scanDomainDiff(t, root, base), unusedDomainRule)
+		if len(got) != 1 || !strings.Contains(got[0].Message, "test-only.example.com") {
+			t.Fatalf("violations = %+v, want test-only.example.com", got)
+		}
+	})
+
+	t.Run("changed Go parse failure", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "target.go", "package sample\n\nfunc broken(\n")
+		commitDomainDiff(t, root, "break source")
+
+		all := scanDomainDiff(t, root, base)
+		got := violationsForRule(all, incompleteDomainRule)
+		if len(got) != 1 || filepath.Base(got[0].File) != "target.go" {
+			t.Fatalf("violations = %+v, want target.go scan-incomplete", got)
+		}
+		if unused := violationsForRule(all, unusedDomainRule); len(unused) != 0 {
+			t.Fatalf("parse failure must not produce unreliable unused-policy diagnostics: %+v", unused)
+		}
+	})
+
+	t.Run("repository type loading failure", func(t *testing.T) {
+		root, base := setupDomainDiffRepo(t, "package sample\n\nvar unrelated = 1\n")
+		writeFile(t, root, "go.mod", "module example.com/domainfixture\n\ngo 1.23.0\n\n"+
+			"require example.com/missing v0.0.0\n\nreplace example.com/missing => ./missing\n")
+		writeFile(t, root, "target.go",
+			"package sample\n\nimport _ \"example.com/missing\"\n\n"+
+				"type Config struct{ Host string }\nvar config = Config{Host: \"malicious.corp.internal\"}\n")
+		commitDomainDiff(t, root, "break type loading")
+
+		all := scanDomainDiff(t, root, base)
+		got := violationsForRule(all, incompleteDomainRule)
+		if len(got) != 1 || filepath.Base(got[0].File) != "go.mod" {
+			t.Fatalf("violations = %+v, want go.mod scan-incomplete", got)
+		}
+		if !strings.Contains(got[0].Message, "load Go type information") {
+			t.Fatalf("message = %q, want type-loading failure", got[0].Message)
+		}
+		if unused := violationsForRule(all, unusedDomainRule); len(unused) != 0 {
+			t.Fatalf("type-loading failure must not produce unreliable unused-policy diagnostics: %+v", unused)
+		}
+	})
+}

lint/domaincontract/unapproved_test.go

@@ -0,0 +1,380 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package domaincontract
+
+import (
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"go/types"
+	"sort"
+	"testing"
+)
+
+func scanDomainEvidence(t *testing.T, source string) []domainEvidence {
+	t.Helper()
+	fset := token.NewFileSet()
+	file, err := parser.ParseFile(fset, "fixture.go", source, 0)
+	if err != nil {
+		t.Fatalf("parse fixture: %v\n%s", err, source)
+	}
+	scan := newFileDomainScan(typedGoFile{File: file, Fset: fset})
+	scan.collectSemanticEvidence()
+	scan.collectAbsoluteURLEvidence()
+	sort.Slice(scan.Evidence, func(i, j int) bool {
+		if scan.Evidence[i].Host != scan.Evidence[j].Host {
+			return scan.Evidence[i].Host < scan.Evidence[j].Host
+		}
+		return scan.Evidence[i].Expr.Pos() < scan.Evidence[j].Expr.Pos()
+	})
+	return scan.Evidence
+}
+
+func scanTypedDomainEvidence(t *testing.T, source string) []domainEvidence {
+	t.Helper()
+	return scanTypedDomainEvidenceInPackage(t, "fixture", source)
+}
+
+func scanTypedDomainEvidenceInPackage(t *testing.T, packagePath, source string) []domainEvidence {
+	t.Helper()
+	fset := token.NewFileSet()
+	file, err := parser.ParseFile(fset, "fixture.go", source, 0)
+	if err != nil {
+		t.Fatalf("parse fixture: %v\n%s", err, source)
+	}
+	info := &types.Info{
+		Types:      map[ast.Expr]types.TypeAndValue{},
+		Defs:       map[*ast.Ident]types.Object{},
+		Uses:       map[*ast.Ident]types.Object{},
+		Selections: map[*ast.SelectorExpr]*types.Selection{},
+	}
+	if _, err := (&types.Config{}).Check(packagePath, fset, []*ast.File{file}, info); err != nil {
+		t.Fatalf("type-check fixture: %v\n%s", err, source)
+	}
+	scan := newFileDomainScan(typedGoFile{File: file, Fset: fset, Info: info})
+	scan.collectSemanticEvidence()
+	scan.collectAbsoluteURLEvidence()
+	sort.Slice(scan.Evidence, func(i, j int) bool {
+		if scan.Evidence[i].Host != scan.Evidence[j].Host {
+			return scan.Evidence[i].Host < scan.Evidence[j].Host
+		}
+		return scan.Evidence[i].Expr.Pos() < scan.Evidence[j].Expr.Pos()
+	})
+	return scan.Evidence
+}
+
+func evidenceHosts(evidence []domainEvidence) []string {
+	hosts := make([]string, 0, len(evidence))
+	for _, item := range evidence {
+		hosts = append(hosts, item.Host)
+	}
+	return hosts
+}
+
+func TestTypedAbsoluteURLDeclarationProducesOneFinding(t *testing.T) {
+	evidence := scanTypedDomainEvidence(t,
+		"package p\nconst DomainContractE2EURL = \"https://private.corp.internal/v1\"\n")
+	if got := evidenceHosts(evidence); len(got) != 1 || got[0] != "private.corp.internal" {
+		t.Fatalf("hosts = %v, want [private.corp.internal]", got)
+	}
+}
+
+func TestGoDomainEvidenceTruePositives(t *testing.T) {
+	tests := []struct {
+		name   string
+		source string
+		want   []string
+	}{
+		{
+			name:   "PR 1975 Feishu assignment",
+			source: "package p\nfunc f() { host := \"internal-api-drive-stream.feishu.cn\"; _ = host }\n",
+			want:   []string{"internal-api-drive-stream.feishu.cn"},
+		},
+		{
+			name:   "PR 1975 Lark assignment",
+			source: "package p\nfunc f() { var host string; host = \"internal-api-drive-stream.larksuite.com\"; _ = host }\n",
+			want:   []string{"internal-api-drive-stream.larksuite.com"},
+		},
+		{
+			name:   "uppercase snake target",
+			source: "package p\nfunc f() { API_HOST := \"private.corp.internal\"; _ = API_HOST }\n",
+			want:   []string{"private.corp.internal"},
+		},
+		{
+			name:   "typed declaration",
+			source: "package p\nconst APIHost string = \"attacker.zip\"\n",
+			want:   []string{"attacker.zip"},
+		},
+		{
+			name:   "grouped const declaration",
+			source: "package p\nconst (\n APIHost string = \"attacker.zip\"\n)\n",
+			want:   []string{"attacker.zip"},
+		},
+		{
+			name:   "grouped var declaration",
+			source: "package p\nvar (\n APIHost string = \"attacker.zip\"\n)\n",
+			want:   []string{"attacker.zip"},
+		},
+		{
+			name: "multi assignment",
+			source: "package p\nfunc f() {\n" +
+				" APIHost, BackupHost := \"public.example.com\", \"attacker.zip\"\n" +
+				" _, _ = APIHost, BackupHost\n}\n",
+			want: []string{"attacker.zip", "public.example.com"},
+		},
+		{
+			name:   "map semantic key",
+			source: "package p\nvar c = map[string]string{\"host\": \"private.corp.internal\"}\n",
+			want:   []string{"private.corp.internal"},
+		},
+		{
+			name:   "map semantic key assignment",
+			source: "package p\nfunc f() { c := map[string]string{}; c[\"host\"] = \"private.corp.internal\" }\n",
+			want:   []string{"private.corp.internal"},
+		},
+		{
+			name:   "host collection values",
+			source: "package p\nvar ALLOWED_HOSTS = []string{\"private.corp.internal\", \"attacker.zip\"}\n",
+			want:   []string{"attacker.zip", "private.corp.internal"},
+		},
+		{
+			name:   "host collection map keys",
+			source: "package p\nvar allowedHosts = map[string]struct{}{\"attacker.zip\": {}}\n",
+			want:   []string{"attacker.zip"},
+		},
+		{
+			name:   "host collection bool map keys",
+			source: "package p\nvar AllowedHosts = map[string]bool{\"api.example.com\": true}\n",
+			want:   []string{"api.example.com"},
+		},
+		{
+			name:   "host collection map values",
+			source: "package p\nvar HostsByRegion = map[string]string{\"sg\": \"api.example.com\"}\n",
+			want:   []string{"api.example.com"},
+		},
+		{
+			name: "host collection map value assignment",
+			source: "package p\nfunc f() {\n" +
+				" HostsByRegion := map[string]string{}\n" +
+				" HostsByRegion[\"sg\"] = \"api.example.com\"\n" +
+				"}\n",
+			want: []string{"api.example.com"},
+		},
+		{
+			name:   "static concatenation",
+			source: "package p\nvar APIHost = \"attacker.\" + \"zip\"\n",
+			want:   []string{"attacker.zip"},
+		},
+		{
+			name:   "multiline assignment",
+			source: "package p\nfunc f() {\n APIHost :=\n  \"attacker.zip\"\n _ = APIHost\n}\n",
+			want:   []string{"attacker.zip"},
+		},
+		{
+			name:   "escaped hostname",
+			source: "package p\nvar APIHost = \"private\\u002ecorp\\u002einternal\"\n",
+			want:   []string{"private.corp.internal"},
+		},
+		{
+			name:   "hex escaped hostname",
+			source: "package p\nvar APIHost = \"private\\x2ecorp\\x2einternal\"\n",
+			want:   []string{"private.corp.internal"},
+		},
+		{
+			name:   "octal escaped hostname",
+			source: "package p\nvar APIHost = \"private\\056corp\\056internal\"\n",
+			want:   []string{"private.corp.internal"},
+		},
+		{
+			name:   "raw hostname",
+			source: "package p\nvar APIHost = `private.corp.internal`\n",
+			want:   []string{"private.corp.internal"},
+		},
+		{
+			name: "same-file constant reference",
+			source: "package p\nconst existingConst = \"private.corp.internal\"\n" +
+				"func f() { APIHost := existingConst; _ = APIHost }\n",
+			want: []string{"private.corp.internal"},
+		},
+		{
+			name:   "absolute URL",
+			source: "package p\nvar message = \"https://private.corp.internal/v1\"\n",
+			want:   []string{"private.corp.internal"},
+		},
+		{
+			name:   "websocket URL with port",
+			source: "package p\nvar endpoint = \"wss://private.corp.internal:443/v1\"\n",
+			want:   []string{"private.corp.internal"},
+		},
+		{
+			name:   "URL userinfo query and fragment",
+			source: "package p\nvar endpoint = \" https://user:pass@private.corp.internal:8443/v1?q=1#result \"\n",
+			want:   []string{"private.corp.internal"},
+		},
+		{
+			name:   "IDN hostname",
+			source: "package p\nvar APIHost = \"例子.公司.cn\"\n",
+			want:   []string{"例子.公司.cn"},
+		},
+		{
+			name:   "case port and trailing dot normalization",
+			source: "package p\nvar APIHost = \"EXAMPLE.COM.:443\"\n",
+			want:   []string{"example.com"},
+		},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			got := evidenceHosts(scanDomainEvidence(t, tc.source))
+			if len(got) != len(tc.want) {
+				t.Fatalf("hosts = %v, want %v", got, tc.want)
+			}
+			for i := range got {
+				if got[i] != tc.want[i] {
+					t.Fatalf("hosts = %v, want %v", got, tc.want)
+				}
+			}
+		})
+	}
+}
+
+func TestGoDomainEvidenceTrueNegatives(t *testing.T) {
+	source := `package p
+
+import _ "github.com/larksuite/oapi-sdk-go/v3"
+
+var file = "archive.zip"
+var event = "card.action.trigger"
+var schema = "im.messages.list"
+var configFile = "service.prod.json"
+var version = "v1.2.3"
+var email = "name@example.com"
+var lowConfidence = "attacker.zip"
+var downloadURL = "archive.zip/file"
+var prose = "See https://private.corp.internal/v1 for details"
+// https://private.corp.internal/v1
+var ghost = "private.corp.internal"
+var hostnameParser = "private.corp.internal"
+var domainError = "private.corp.internal"
+var APIHost = "localhost"
+var BackupHost = "127.0.0.1"
+var hosts = struct{ File string }{File: "archive.zip"}
+var AllowedHosts = map[string]string{"api.example.com": "client.pem"}
+
+func dynamicValue() string { return "private.corp.internal" }
+var DynamicHost = dynamicValue()
+
+func setAmbiguousHostMetadata() {
+	AllowedHosts["api.example.com"] = "client.pem"
+}
+`
+	if got := scanDomainEvidence(t, source); len(got) != 0 {
+		t.Fatalf("unexpected evidence: %+v", got)
+	}
+}
+
+func TestTypedStructFieldHostnameSemantics(t *testing.T) {
+	t.Run("network fields", func(t *testing.T) {
+		source := `package source
+
+type Config struct { Host string }
+type FeishuSource struct { Domain string }
+
+var config = Config{Host: "api.example.com"}
+var source = FeishuSource{Domain: "events.example.com"}
+`
+		got := evidenceHosts(scanTypedDomainEvidenceInPackage(
+			t,
+			"github.com/larksuite/cli/internal/event/source",
+			source,
+		))
+		want := []string{"api.example.com", "events.example.com"}
+		if len(got) != len(want) || got[0] != want[0] || got[1] != want[1] {
+			t.Fatalf("hosts = %v, want %v", got, want)
+		}
+	})
+
+	t.Run("command metadata domain", func(t *testing.T) {
+		source := `package cmdmeta
+
+type Meta struct { Domain string }
+
+var meta = Meta{Domain: "im.messages"}
+func update(meta *Meta) { meta.Domain = "docs.pages" }
+`
+		if got := scanTypedDomainEvidenceInPackage(
+			t,
+			"github.com/larksuite/cli/internal/cmdmeta",
+			source,
+		); len(got) != 0 {
+			t.Fatalf("unexpected command metadata evidence: %+v", got)
+		}
+	})
+
+	t.Run("card action host", func(t *testing.T) {
+		source := `package im
+
+type CardActionTriggerOutput struct { Host string }
+
+var output = CardActionTriggerOutput{Host: "card.action"}
+func update(output *CardActionTriggerOutput) { output.Host = "im.message" }
+`
+		if got := scanTypedDomainEvidenceInPackage(
+			t,
+			"github.com/larksuite/cli/events/im",
+			source,
+		); len(got) != 0 {
+			t.Fatalf("unexpected card host evidence: %+v", got)
+		}
+	})
+
+	t.Run("unknown field ownership is conservative", func(t *testing.T) {
+		source := "package p\ntype Config struct { Host string }\nvar c = Config{Host: \"api.example.com\"}\n"
+		if got := scanDomainEvidence(t, source); len(got) != 0 {
+			t.Fatalf("unexpected untyped field evidence: %+v", got)
+		}
+	})
+}
+
+func TestHostnameSemanticNames(t *testing.T) {
+	for _, name := range []string{
+		"host", "HOST", "hosts", "hostname", "domains",
+		"api_host", "API_HOST", "ALLOWED_HOSTS",
+		"apiHost", "APIHost", "backupHostname",
+		"HostsByRegion", "APIHostsByRegion", "hostsByRegion",
+	} {
+		if !isHostnameSemanticName(name) {
+			t.Errorf("%q should be hostname-semantic", name)
+		}
+	}
+	for _, name := range []string{
+		"ghost", "hostnameParser", "domainError", "hostValue", "downloadURL", "endpoint", "origin",
+		"HostBypass", "APIHostBypass",
+	} {
+		if isHostnameSemanticName(name) {
+			t.Errorf("%q must not be hostname-semantic", name)
+		}
+	}
+}
+
+func TestDomainFixturePaths(t *testing.T) {
+	for _, path := range []string{
+		"internal/x/x_test.go",
+		"tests/cli_e2e/x.go",
+		"internal/x/testdata/sample.go",
+	} {
+		if !isDomainFixturePath(path) {
+			t.Errorf("%q should be fixture scope", path)
+		}
+	}
+	for _, path := range []string{
+		"internal/x/test_helper.go",
+		"examples/demo.go",
+		"skills/example/testdata/sample.go",
+		"skills/example/example_test.go",
+	} {
+		if isDomainFixturePath(path) {
+			t.Errorf("%q must not be fixture scope", path)
+		}
+	}
+}

lint/main.go

@@ -3,7 +3,7 @@
 
 // Command lintcheck runs repository source-contract guards that golangci-lint
 // cannot express directly. It currently covers typed-error contracts and the
-// resolver-owned endpoint contract.
+// resolver-owned endpoint and approved-domain contracts.
 //
 // lintcheck lives in its own Go module under lint/ so its build-time
 // dependency on golang.org/x/tools/go/packages does not leak into the
@@ -43,8 +43,10 @@ type scanner struct {
 
 var scanners = []scanner{
 	{name: "errscontract", fn: errscontract.ScanRepoWithOptions},
-	{name: "domaincontract", fn: func(root string, _ errscontract.ScanOptions) ([]lintapi.Violation, error) {
-		return domaincontract.ScanRepo(root)
+	{name: "domaincontract", fn: func(root string, opts errscontract.ScanOptions) ([]lintapi.Violation, error) {
+		return domaincontract.ScanRepoWithOptions(root, domaincontract.ScanOptions{
+			ChangedFrom: opts.ChangedFrom,
+		})
 	}},
 }
 
@@ -57,7 +59,7 @@ func main() {
 				"Runs every registered lint domain against repo-root (default: current directory).\n")
 		flag.PrintDefaults()
 	}
-	flag.StringVar(&changedFrom, "changed-from", "", "base revision for incremental boundary-error checks")
+	flag.StringVar(&changedFrom, "changed-from", "", "base revision for incremental source-contract checks")
 	flag.BoolVar(&printLegacyCommandErrorCandidates, "print-legacy-command-error-candidates", false, "print existing command boundary bare errors as allowlist candidates")
 	flag.Parse()
 

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@larksuite/cli",
-  "version": "1.0.76",
+  "version": "1.0.81",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@larksuite/cli",
-      "version": "1.0.76",
+      "version": "1.0.81",
       "cpu": [
         "x64",
         "arm64",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@larksuite/cli",
-  "version": "1.0.76",
+  "version": "1.0.81",
   "description": "The official CLI for Lark/Feishu open platform",
   "bin": {
     "lark-cli": "scripts/run.js"

scripts/semantic-review-workflow.test.sh

@@ -176,7 +176,15 @@ if ! grep -Fq "if: always() && github.event.workflow_run.conclusion == 'success'
   exit 1
 fi
 
-require_in_step "$summary_verify_step" 'workflowPath !== ".github/workflows/ci.yml"' "PR quality summary must verify the triggering workflow path"
+if grep -Fq 'run.name !== "CI"' "$workflow"; then
+  echo "semantic-review must not use the dynamic workflow run name as workflow identity" >&2
+  exit 1
+fi
+
+require_in_step "$summary_verify_step" 'github.rest.actions.getWorkflow' "PR quality summary must resolve static workflow metadata"
+require_in_step "$summary_verify_step" 'workflow.name !== "CI"' "PR quality summary must verify the static workflow name"
+require_in_step "$summary_verify_step" 'workflow.path !== ".github/workflows/ci.yml"' "PR quality summary must verify the static workflow path"
+require_in_step "$summary_verify_step" 'run.path && run.path !== workflow.path' "PR quality summary must reject workflow path metadata mismatches"
 require_in_step "$summary_verify_step" 'run.event !== "pull_request"' "PR quality summary must only handle pull_request workflow_run events"
 require_in_step "$summary_verify_step" 'run.repository.id !== context.payload.repository.id' "PR quality summary must verify workflow_run repository id"
 require_in_step "$summary_verify_step" 'const targetHeadSha = run.head_sha' "PR quality summary must use the CI run head SHA as the verified PR head"
@@ -201,7 +209,10 @@ require_in_step "$summary_publish_step" 'CI_QUALITY_SUMMARY_BASE_SHA' "PR qualit
 require_in_step "$summary_publish_step" 'CI_QUALITY_SUMMARY_RUN_ID' "PR quality summary publisher must receive verified workflow run id"
 require_in_step "$summary_publish_step" 'require("./scripts/ci-quality-summary-publish.js")' "PR quality summary publisher must use the shared CI publisher script"
 
-require_in_step "$verify_step" 'workflowPath !== ".github/workflows/ci.yml"' "semantic-review must verify the triggering workflow path"
+require_in_step "$verify_step" 'github.rest.actions.getWorkflow' "semantic-review must resolve static workflow metadata"
+require_in_step "$verify_step" 'workflow.name !== "CI"' "semantic-review must verify the static workflow name"
+require_in_step "$verify_step" 'workflow.path !== ".github/workflows/ci.yml"' "semantic-review must verify the static workflow path"
+require_in_step "$verify_step" 'run.path && run.path !== workflow.path' "semantic-review must reject workflow path metadata mismatches"
 require_in_step "$verify_step" 'run.repository.id !== context.payload.repository.id' "semantic-review must verify workflow_run repository id"
 require_in_step "$verify_step" 'run.event !== "pull_request"' "semantic-review must only handle pull_request workflow_run events"
 require_in_step "$verify_step" 'run.conclusion !== "success"' "semantic-review must only consume successful CI runs"

shortcuts/apps/apps_cache_clear.go

@@ -0,0 +1,71 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package apps
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"github.com/larksuite/cli/shortcuts/common"
+)
+
+// AppsCacheClear clears all cache entries for the app in the given environment.
+//
+// POST /apps/{app_id}/cache/clear，body {env}。清空当前应用指定环境下全部缓存，用于无法定位
+// 具体 key 的快速恢复；影响面大，定 high-risk-write（框架自动注入 --yes 确认）。
+var AppsCacheClear = common.Shortcut{
+	Service:     appsService,
+	Command:     "+cache-clear",
+	Description: "Clear all cache entries for the app in the given environment",
+	Risk:        "high-risk-write",
+	Tips: []string{
+		"Example: lark-cli apps +cache-clear --app-id <app_id> --environment dev --yes",
+	},
+	Scopes:    []string{"spark:app:write"},
+	AuthTypes: []string{"user"},
+	HasFormat: true,
+	Flags: []common.Flag{
+		{Name: "app-id", Desc: "Miaoda app id", Required: true},
+		cacheEnvFlag(),
+	},
+	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
+		_, err := requireAppID(rctx.Str("app-id"))
+		return err
+	},
+	DryRun: func(ctx context.Context, rctx *common.RuntimeContext) *common.DryRunAPI {
+		appID, _ := requireAppID(rctx.Str("app-id"))
+		return common.NewDryRunAPI().
+			POST(appCacheClearPath(appID)).
+			Desc("Clear all cache entries for the app in the given environment").
+			Body(dbEnvParams(rctx, map[string]interface{}{}))
+	},
+	Execute: func(ctx context.Context, rctx *common.RuntimeContext) error {
+		appID, err := requireAppID(rctx.Str("app-id"))
+		if err != nil {
+			return err
+		}
+		data, err := rctx.CallAPITyped("POST", appCacheClearPath(appID), nil, dbEnvParams(rctx, map[string]interface{}{}))
+		if err != nil {
+			return withAppsHint(err, appIDListHint)
+		}
+		out := map[string]interface{}{
+			"environment":       resolvedEnv(data, rctx),
+			"deleted_key_count": cacheInt(data["deleted_key_count"]),
+		}
+		rctx.OutFormat(out, nil, func(w io.Writer) {
+			renderCacheClearPretty(w, out)
+		})
+		return nil
+	},
+}
+
+// renderCacheClearPretty 打 "✓ cache cleared: N entries (env)"。
+func renderCacheClearPretty(w io.Writer, out map[string]interface{}) {
+	n := int64(0)
+	if f, ok := numericAsFloat(out["deleted_key_count"]); ok {
+		n = int64(f)
+	}
+	fmt.Fprintf(w, "✓ cache cleared: %d entries (%s)\n", n, common.GetString(out, "environment"))
+}

shortcuts/apps/apps_cache_delete.go

@@ -0,0 +1,75 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package apps
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"github.com/larksuite/cli/shortcuts/common"
+)
+
+// AppsCacheDelete deletes a single business cache key (idempotent).
+//
+// DELETE /apps/{app_id}/cache?env=&key=。缓存是派生数据、删单 key 影响面小且可重建，
+// 故定 write（非 high-risk-write、不需 --yes）。目标不存在按幂等成功处理（deleted_key_count=0）。
+var AppsCacheDelete = common.Shortcut{
+	Service:     appsService,
+	Command:     "+cache-delete",
+	Description: "Delete a single business cache key (idempotent)",
+	Risk:        "write",
+	Tips: []string{
+		"Example: lark-cli apps +cache-delete --app-id <app_id> --environment dev --key <key>",
+	},
+	Scopes:    []string{"spark:app:write"},
+	AuthTypes: []string{"user"},
+	HasFormat: true,
+	Flags: []common.Flag{
+		{Name: "app-id", Desc: "Miaoda app id", Required: true},
+		{Name: "key", Desc: "business cache key", Required: true},
+		cacheEnvFlag(),
+	},
+	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
+		_, err := requireAppID(rctx.Str("app-id"))
+		return err
+	},
+	DryRun: func(ctx context.Context, rctx *common.RuntimeContext) *common.DryRunAPI {
+		appID, _ := requireAppID(rctx.Str("app-id"))
+		return common.NewDryRunAPI().
+			DELETE(appCachePath(appID)).
+			Desc("Delete a Miaoda app runtime cache key").
+			Params(dbEnvParams(rctx, map[string]interface{}{"key": rctx.Str("key")}))
+	},
+	Execute: func(ctx context.Context, rctx *common.RuntimeContext) error {
+		appID, err := requireAppID(rctx.Str("app-id"))
+		if err != nil {
+			return err
+		}
+		key := rctx.Str("key")
+		data, err := rctx.CallAPITyped("DELETE", appCachePath(appID), dbEnvParams(rctx, map[string]interface{}{"key": key}), nil)
+		if err != nil {
+			return withAppsHint(err, appIDListHint)
+		}
+		out := map[string]interface{}{
+			"key":               key,
+			"environment":       resolvedEnv(data, rctx),
+			"deleted_key_count": cacheInt(data["deleted_key_count"]),
+		}
+		rctx.OutFormat(out, nil, func(w io.Writer) {
+			renderCacheDeletePretty(w, out)
+		})
+		return nil
+	},
+}
+
+// renderCacheDeletePretty 命中打 "✓ cache deleted"，幂等未命中打 "✓ cache already absent"（措辞区分，都成功）。
+func renderCacheDeletePretty(w io.Writer, out map[string]interface{}) {
+	key := common.GetString(out, "key")
+	if n, ok := numericAsFloat(out["deleted_key_count"]); ok && n > 0 {
+		fmt.Fprintf(w, "✓ cache deleted: %s\n", key)
+		return
+	}
+	fmt.Fprintf(w, "✓ cache already absent: %s\n", key)
+}

shortcuts/apps/apps_cache_get.go

@@ -0,0 +1,105 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package apps
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"github.com/larksuite/cli/shortcuts/common"
+)
+
+// AppsCacheGet reads a single business cache key's value + metadata.
+//
+// GET /apps/{app_id}/cache?env=&key=。value 在 wire 上是 JSON 字符串透传：--format json
+// 原样输出该字符串（不反序列化），--format pretty 反序列化后缩进展开。value_size_bytes 由 CLI
+// 按 value 字节长度算出（端点不返回）；未命中（exists=false）时不带 value，ttl_ms/value_size_bytes 为 null。
+var AppsCacheGet = common.Shortcut{
+	Service:     appsService,
+	Command:     "+cache-get",
+	Description: "Get a business cache key's value and metadata",
+	Risk:        "read",
+	Tips: []string{
+		"Example: lark-cli apps +cache-get --app-id <app_id> --key spotbonus:2026:winners:list:v1",
+		"Example: lark-cli apps +cache-get --app-id <app_id> --environment online --key <key>",
+	},
+	Scopes:    []string{"spark:app:read"},
+	AuthTypes: []string{"user"},
+	HasFormat: true,
+	Flags: []common.Flag{
+		{Name: "app-id", Desc: "Miaoda app id", Required: true},
+		{Name: "key", Desc: "business cache key", Required: true},
+		cacheEnvFlag(),
+	},
+	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
+		_, err := requireAppID(rctx.Str("app-id"))
+		return err
+	},
+	DryRun: func(ctx context.Context, rctx *common.RuntimeContext) *common.DryRunAPI {
+		appID, _ := requireAppID(rctx.Str("app-id"))
+		return common.NewDryRunAPI().
+			GET(appCachePath(appID)).
+			Desc("Get a Miaoda app runtime cache key").
+			Params(dbEnvParams(rctx, map[string]interface{}{"key": rctx.Str("key")}))
+	},
+	Execute: func(ctx context.Context, rctx *common.RuntimeContext) error {
+		appID, err := requireAppID(rctx.Str("app-id"))
+		if err != nil {
+			return err
+		}
+		key := rctx.Str("key")
+		data, err := rctx.CallAPITyped("GET", appCachePath(appID), dbEnvParams(rctx, map[string]interface{}{"key": key}), nil)
+		if err != nil {
+			return withAppsHint(err, appIDListHint)
+		}
+		out := projectCacheGet(data, key, rctx)
+		rctx.OutFormat(out, nil, func(w io.Writer) {
+			renderCacheGetPretty(w, out)
+		})
+		return nil
+	},
+}
+
+// projectCacheGet 组装 cache-get 输出：key 回显、environment 取 resolved env、exists 直读；
+// 命中时带 ttl_ms + value（原始串）+ value_size_bytes（CLI 算），未命中时 ttl_ms/value_size_bytes 为 null、无 value。
+func projectCacheGet(data map[string]interface{}, key string, rctx *common.RuntimeContext) map[string]interface{} {
+	exists := cacheBool(data["exists"])
+	out := map[string]interface{}{
+		"key":         key,
+		"environment": resolvedEnv(data, rctx),
+		"exists":      exists,
+	}
+	if exists {
+		val := common.GetString(data, "value")
+		out["ttl_ms"] = cacheInt(data["ttl_ms"])
+		out["value_size_bytes"] = len([]byte(val))
+		out["value"] = val
+	} else {
+		out["ttl_ms"] = nil
+		out["value_size_bytes"] = nil
+	}
+	return out
+}
+
+// renderCacheGetPretty 打元信息块（key/environment/exists，命中再加 ttl/value_size），命中时末尾展开 value。
+func renderCacheGetPretty(w io.Writer, out map[string]interface{}) {
+	exists, _ := out["exists"].(bool)
+	pairs := [][2]string{
+		{"key", common.GetString(out, "key")},
+		{"environment", common.GetString(out, "environment")},
+		{"exists", fmt.Sprintf("%v", exists)},
+	}
+	if exists {
+		pairs = append(pairs,
+			[2]string{"ttl", formatCacheTTL(out["ttl_ms"])},
+			[2]string{"value_size", humanBytes(out["value_size_bytes"])},
+		)
+	}
+	renderKeyValuePairs(w, pairs)
+	if exists {
+		fmt.Fprintln(w, "value:")
+		printCacheValuePretty(w, common.GetString(out, "value"))
+	}
+}

shortcuts/apps/apps_cache_test.go

@@ -0,0 +1,357 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package apps
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+
+	"github.com/larksuite/cli/internal/httpmock"
+)
+
+const (
+	cacheURL      = "/open-apis/spark/v1/apps/app_x/cache"
+	cacheClearURL = "/open-apis/spark/v1/apps/app_x/cache/clear"
+)
+
+// cacheValueStr 是服务端在 wire 上透传的原始 JSON 字符串（value 不反序列化）。
+const cacheValueStr = `[{"name":"Alice","award":"Gold"},{"name":"Bob","award":"Silver"}]`
+
+// ── cache-get ──
+
+// TestAppsCacheGet_HitJSON：命中时 json 默认——value 原样透传（不反序列化），
+// value_size_bytes 由 CLI 按 value 字节长度算出，environment 取服务端 resolved env。
+func TestAppsCacheGet_HitJSON(t *testing.T) {
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "GET", URL: cacheURL,
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{
+			"env": "online", "exists": true, "ttl_ms": 272000, "value": cacheValueStr,
+		}},
+	})
+	if err := runAppsShortcut(t, AppsCacheGet,
+		[]string{"+cache-get", "--app-id", "app_x", "--environment", "online", "--key", "k:1", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute err=%v", err)
+	}
+	d := parseEnvelopeData(t, stdout)
+	if d["key"] != "k:1" || d["environment"] != "online" || d["exists"] != true {
+		t.Fatalf("get hit data=%v", d)
+	}
+	if v, _ := d["value"].(string); v != cacheValueStr {
+		t.Fatalf("value must be raw passthrough string, got %v", d["value"])
+	}
+	if sz, _ := numericAsFloat(d["value_size_bytes"]); int(sz) != len(cacheValueStr) {
+		t.Fatalf("value_size_bytes = %v, want %d", d["value_size_bytes"], len(cacheValueStr))
+	}
+	// ttl_ms 必须是 JSON number（透传服务端数字，不得变成字符串）；JSON 解析后为 float64。
+	if _, ok := d["ttl_ms"].(float64); !ok {
+		t.Fatalf("ttl_ms must be a JSON number, got %T (%v)", d["ttl_ms"], d["ttl_ms"])
+	}
+}
+
+// TestAppsCacheGet_HitPretty：pretty 把 value 反序列化后展开（含缩进后的字段），并打元信息标签。
+func TestAppsCacheGet_HitPretty(t *testing.T) {
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "GET", URL: cacheURL,
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{
+			"env": "online", "exists": true, "ttl_ms": 272000, "value": cacheValueStr,
+		}},
+	})
+	if err := runAppsShortcut(t, AppsCacheGet,
+		[]string{"+cache-get", "--app-id", "app_x", "--environment", "online", "--key", "k:1", "--format", "pretty", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute err=%v", err)
+	}
+	got := stdout.String()
+	for _, want := range []string{"key", "environment", "exists", "value", "Alice"} {
+		if !strings.Contains(got, want) {
+			t.Errorf("pretty missing %q:\n%s", want, got)
+		}
+	}
+}
+
+// TestAppsCacheGet_Miss：未命中——exists=false，无 value，ttl_ms / value_size_bytes 为 null。
+func TestAppsCacheGet_Miss(t *testing.T) {
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "GET", URL: cacheURL,
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{
+			"env": "online", "exists": false,
+		}},
+	})
+	if err := runAppsShortcut(t, AppsCacheGet,
+		[]string{"+cache-get", "--app-id", "app_x", "--environment", "online", "--key", "k:1", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute err=%v", err)
+	}
+	d := parseEnvelopeData(t, stdout)
+	if d["exists"] != false {
+		t.Fatalf("miss exists=%v", d["exists"])
+	}
+	if _, ok := d["value"]; ok {
+		t.Fatalf("miss must not carry value: %v", d)
+	}
+	if d["ttl_ms"] != nil || d["value_size_bytes"] != nil {
+		t.Fatalf("miss ttl_ms/value_size_bytes must be null: %v", d)
+	}
+}
+
+// TestAppsCacheGet_ExistsAsString：服务端把 exists 返成字符串 "true" 时仍按命中处理
+// （cacheBool 容错，防 exists 以字符串形态出现被误判成未命中、hit→miss 翻转）。
+func TestAppsCacheGet_ExistsAsString(t *testing.T) {
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "GET", URL: cacheURL,
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{
+			"env": "online", "exists": "true", "ttl_ms": 272000, "value": cacheValueStr,
+		}},
+	})
+	if err := runAppsShortcut(t, AppsCacheGet,
+		[]string{"+cache-get", "--app-id", "app_x", "--environment", "online", "--key", "k:1", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute err=%v", err)
+	}
+	d := parseEnvelopeData(t, stdout)
+	if d["exists"] != true {
+		t.Fatalf("exists string \"true\" 应按命中解析, got exists=%v", d["exists"])
+	}
+	if v, _ := d["value"].(string); v != cacheValueStr {
+		t.Fatalf("命中应带 value, got %v", d["value"])
+	}
+}
+
+// TestAppsCacheGet_PrettyNonJSONFallback：pretty 下 value 不是合法 JSON 时降级原样输出
+// （safeParseJSON 解析失败→原样打印，不报错、不吞值）。补齐 HitPretty 只覆盖了"能反序列化"路径的缺口。
+func TestAppsCacheGet_PrettyNonJSONFallback(t *testing.T) {
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "GET", URL: cacheURL,
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{
+			"env": "online", "exists": true, "ttl_ms": 272000, "value": "hello-plain-not-json",
+		}},
+	})
+	if err := runAppsShortcut(t, AppsCacheGet,
+		[]string{"+cache-get", "--app-id", "app_x", "--environment", "online", "--key", "k:1", "--format", "pretty", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute err=%v", err)
+	}
+	if !strings.Contains(stdout.String(), "hello-plain-not-json") {
+		t.Fatalf("非 JSON value 应原样输出（降级）, got:\n%s", stdout.String())
+	}
+}
+
+// TestAppsCacheGet_TTLAsStringNormalized：服务端把 ttl_ms 返成字符串 "272000" 时，
+// 输出的 ttl_ms 必须归一成 JSON number（cacheInt），不得随 wire 形态漂移成字符串。
+func TestAppsCacheGet_TTLAsStringNormalized(t *testing.T) {
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "GET", URL: cacheURL,
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{
+			"env": "online", "exists": true, "ttl_ms": "272000", "value": cacheValueStr,
+		}},
+	})
+	if err := runAppsShortcut(t, AppsCacheGet,
+		[]string{"+cache-get", "--app-id", "app_x", "--environment", "online", "--key", "k:1", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute err=%v", err)
+	}
+	d := parseEnvelopeData(t, stdout)
+	f, ok := d["ttl_ms"].(float64)
+	if !ok {
+		t.Fatalf("ttl_ms string wire 应归一成 JSON number, got %T (%v)", d["ttl_ms"], d["ttl_ms"])
+	}
+	if int(f) != 272000 {
+		t.Fatalf("ttl_ms = %v, want 272000", f)
+	}
+}
+
+// TestAppsCacheDelete_CountAsStringNormalized：服务端把 deleted_key_count 返成字符串 "1" 时，
+// 输出必须归一成 JSON number（cacheInt）。
+func TestAppsCacheDelete_CountAsStringNormalized(t *testing.T) {
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "DELETE", URL: cacheURL,
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{"env": "dev", "deleted_key_count": "1"}},
+	})
+	if err := runAppsShortcut(t, AppsCacheDelete,
+		[]string{"+cache-delete", "--app-id", "app_x", "--environment", "dev", "--key", "k:1", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute err=%v", err)
+	}
+	d := parseEnvelopeData(t, stdout)
+	if _, ok := d["deleted_key_count"].(float64); !ok {
+		t.Fatalf("deleted_key_count string wire 应归一成 JSON number, got %T (%v)", d["deleted_key_count"], d["deleted_key_count"])
+	}
+}
+
+// TestAppsCacheGet_DryRunOmitsEnv：不传 --environment 时 dry-run query 不带 env（服务端自动选），但带 key。
+func TestAppsCacheGet_DryRunOmitsEnv(t *testing.T) {
+	factory, stdout, _ := newAppsExecuteFactory(t)
+	if err := runAppsShortcut(t, AppsCacheGet,
+		[]string{"+cache-get", "--app-id", "app_x", "--key", "k:1", "--dry-run", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("dry-run err=%v", err)
+	}
+	a := firstDryRunAPI(t, stdout.String())
+	if a.Method != "GET" || a.URL != cacheURL {
+		t.Fatalf("dry-run = %s %s", a.Method, a.URL)
+	}
+	if _, ok := a.Params["env"]; ok {
+		t.Fatalf("no --environment → env must be omitted, params=%v", a.Params)
+	}
+	if a.Params["key"] != "k:1" {
+		t.Fatalf("key must be in query, params=%v", a.Params)
+	}
+}
+
+// TestAppsCacheGet_DryRunWithEnv：显式 --environment dev → query 带 env=dev。
+func TestAppsCacheGet_DryRunWithEnv(t *testing.T) {
+	factory, stdout, _ := newAppsExecuteFactory(t)
+	if err := runAppsShortcut(t, AppsCacheGet,
+		[]string{"+cache-get", "--app-id", "app_x", "--environment", "dev", "--key", "k:1", "--dry-run", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("dry-run err=%v", err)
+	}
+	a := firstDryRunAPI(t, stdout.String())
+	if a.Params["env"] != "dev" {
+		t.Fatalf("env must be dev, params=%v", a.Params)
+	}
+}
+
+// TestAppsCacheGet_RequiresKey：缺 --key → 校验错。
+func TestAppsCacheGet_RequiresKey(t *testing.T) {
+	factory, stdout, _ := newAppsExecuteFactory(t)
+	if err := runAppsShortcut(t, AppsCacheGet,
+		[]string{"+cache-get", "--app-id", "app_x", "--as", "user"}, factory, stdout); err == nil {
+		t.Fatalf("expected required --key error")
+	}
+}
+
+// ── cache-delete ──
+
+// TestAppsCacheDelete_Hit：删中命中的 key → deleted_key_count=1；pretty 打 "✓ cache deleted"。
+func TestAppsCacheDelete_Hit(t *testing.T) {
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "DELETE", URL: cacheURL,
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{"env": "dev", "deleted_key_count": 1}},
+	})
+	if err := runAppsShortcut(t, AppsCacheDelete,
+		[]string{"+cache-delete", "--app-id", "app_x", "--environment", "dev", "--key", "k:1", "--format", "pretty", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute err=%v", err)
+	}
+	if !strings.Contains(stdout.String(), "✓ cache deleted") {
+		t.Fatalf("pretty: %s", stdout.String())
+	}
+}
+
+// TestAppsCacheDelete_AbsentJSON：目标不存在 → 幂等成功，deleted_key_count=0，pretty 措辞区分。
+func TestAppsCacheDelete_AbsentJSON(t *testing.T) {
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "DELETE", URL: cacheURL,
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{"env": "dev", "deleted_key_count": 0}},
+	})
+	if err := runAppsShortcut(t, AppsCacheDelete,
+		[]string{"+cache-delete", "--app-id", "app_x", "--environment", "dev", "--key", "k:1", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute err=%v", err)
+	}
+	d := parseEnvelopeData(t, stdout)
+	if sz, _ := numericAsFloat(d["deleted_key_count"]); int(sz) != 0 || d["key"] != "k:1" || d["environment"] != "dev" {
+		t.Fatalf("absent data=%v", d)
+	}
+}
+
+// TestAppsCacheDelete_AbsentPretty：不存在 pretty 打 "✓ cache already absent"。
+func TestAppsCacheDelete_AbsentPretty(t *testing.T) {
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "DELETE", URL: cacheURL,
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{"env": "dev", "deleted_key_count": 0}},
+	})
+	if err := runAppsShortcut(t, AppsCacheDelete,
+		[]string{"+cache-delete", "--app-id", "app_x", "--environment", "dev", "--key", "k:1", "--format", "pretty", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute err=%v", err)
+	}
+	if !strings.Contains(stdout.String(), "already absent") {
+		t.Fatalf("pretty: %s", stdout.String())
+	}
+}
+
+// TestAppsCacheDelete_DryRun：DELETE 方法、/cache 路由，query 带 key + env。
+func TestAppsCacheDelete_DryRun(t *testing.T) {
+	factory, stdout, _ := newAppsExecuteFactory(t)
+	if err := runAppsShortcut(t, AppsCacheDelete,
+		[]string{"+cache-delete", "--app-id", "app_x", "--environment", "dev", "--key", "k:1", "--dry-run", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("dry-run err=%v", err)
+	}
+	a := firstDryRunAPI(t, stdout.String())
+	if a.Method != "DELETE" || a.URL != cacheURL {
+		t.Fatalf("dry-run = %s %s", a.Method, a.URL)
+	}
+	if a.Params["key"] != "k:1" || a.Params["env"] != "dev" {
+		t.Fatalf("params=%v", a.Params)
+	}
+}
+
+// ── cache-clear ──
+
+// TestAppsCacheClear_Success：清空成功 → deleted_key_count=128；pretty 打 "✓ cache cleared: 128 entries (dev)"。
+func TestAppsCacheClear_Success(t *testing.T) {
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "POST", URL: cacheClearURL,
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{"env": "dev", "deleted_key_count": 128}},
+	})
+	if err := runAppsShortcut(t, AppsCacheClear,
+		[]string{"+cache-clear", "--app-id", "app_x", "--environment", "dev", "--yes", "--format", "pretty", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute err=%v", err)
+	}
+	if !strings.Contains(stdout.String(), "✓ cache cleared: 128 entries (dev)") {
+		t.Fatalf("pretty: %s", stdout.String())
+	}
+}
+
+// TestAppsCacheClear_RequiresConfirmation：high-risk-write 无 --yes → 被确认门拦截。
+func TestAppsCacheClear_RequiresConfirmation(t *testing.T) {
+	factory, stdout, _ := newAppsExecuteFactory(t)
+	if err := runAppsShortcut(t, AppsCacheClear,
+		[]string{"+cache-clear", "--app-id", "app_x", "--environment", "dev", "--as", "user"}, factory, stdout); err == nil {
+		t.Fatalf("expected confirmation gate without --yes")
+	}
+}
+
+// TestAppsCacheClear_DryRunBodyWithEnv：dry-run POST /cache/clear，body 带 env=dev。
+func TestAppsCacheClear_DryRunBodyWithEnv(t *testing.T) {
+	factory, stdout, _ := newAppsExecuteFactory(t)
+	if err := runAppsShortcut(t, AppsCacheClear,
+		[]string{"+cache-clear", "--app-id", "app_x", "--environment", "dev", "--dry-run", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("dry-run err=%v", err)
+	}
+	a := firstDryRunAPI(t, stdout.String())
+	if a.Method != "POST" || a.URL != cacheClearURL {
+		t.Fatalf("dry-run = %s %s", a.Method, a.URL)
+	}
+	if a.Body["env"] != "dev" {
+		t.Fatalf("body must carry env=dev, body=%v", a.Body)
+	}
+}
+
+// TestAppsCacheClear_DryRunBodyOmitsEnv：不传 --environment → body 不带 env（服务端自动选）。
+func TestAppsCacheClear_DryRunBodyOmitsEnv(t *testing.T) {
+	factory, stdout, _ := newAppsExecuteFactory(t)
+	if err := runAppsShortcut(t, AppsCacheClear,
+		[]string{"+cache-clear", "--app-id", "app_x", "--dry-run", "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("dry-run err=%v", err)
+	}
+	a := firstDryRunAPI(t, stdout.String())
+	if _, ok := a.Body["env"]; ok {
+		t.Fatalf("no --environment → body env must be omitted, body=%v", a.Body)
+	}
+}
+
+// firstDryRunAPI 解析 dry-run 输出的第一个 api[] 项（method/url/params/body）。
+// 复用本包规范的 dryRunAPIEnvelope（api 现嵌在 data.api 下，见 dryrun_test.go）。
+func firstDryRunAPI(t *testing.T, s string) dryRunAPICall {
+	t.Helper()
+	var env dryRunAPIEnvelope
+	if err := json.Unmarshal([]byte(s), &env); err != nil || len(env.API) == 0 {
+		t.Fatalf("bad dry-run json: %v\n%s", err, s)
+	}
+	return env.API[0]
+}

shortcuts/apps/apps_file_list.go

@@ -12,10 +12,23 @@ import (
 	"github.com/larksuite/cli/shortcuts/common"
 )
 
+// maxFileListPageSize 是 file_list 分页上限，与后端 paas_storage checkMaxKeys 的 (0, 200] 契约对齐：
+// page_size > 200 服务端直接返回 ErrInvalidRequest("maxKeys not in range (0, 200]")。CLI 前置校验避免无谓往返。
+// 注：服务端对 page_size<=0 会兜底为默认值，但 CLI 默认已是 20、显式传 <1 属误用，故与其它 list 命令一致地按 [1, 200] 校验。
+const maxFileListPageSize = 200
+
+// validateFileListPageSize 前置校验 --page-size ∈ [1, maxFileListPageSize]，与后端 checkMaxKeys 的 (0, 200] 契约对齐。
+func validateFileListPageSize(n int) error {
+	if n < 1 || n > maxFileListPageSize {
+		return appsValidationParamError("--page-size", "--page-size must be between 1 and %d", maxFileListPageSize)
+	}
+	return nil
+}
+
 // AppsFileList lists files in a Miaoda app's storage (cursor pagination)。
 //
 // GET /apps/{app_id}/storage/file_list。过滤器：--name / --path / --type / --size-gt /
-// --size-lt / --uploaded-since / --uploaded-until（精确或区间），分页 --page-size/--page-token。
+// --size-lt / --uploaded-since / --uploaded-until（精确或区间），分页 --page-size(1..200)/--page-token。
 // file 域不分 dev/online，无 --env。
 //
 // pretty 渲染 5 列：file_name / path / size / type / uploaded_at；空结果打 "No files found."。
@@ -41,13 +54,17 @@ var AppsFileList = common.Shortcut{
 		{Name: "size-lt", Type: "int", Desc: "filter: size less than (bytes)"},
 		{Name: "uploaded-since", Desc: "filter: uploaded at or after; relative (7d/2h/30s) | date (2026-04-15) | datetime (2026-04-15T10:00:00) | ISO 8601 w/ TZ (bare date/datetime read in local timezone)"},
 		{Name: "uploaded-until", Desc: "filter: uploaded at or before; relative (7d/2h/30s) | date (2026-04-15) | datetime (2026-04-15T10:00:00) | ISO 8601 w/ TZ (bare date/datetime read in local timezone)"},
-		{Name: "page-size", Type: "int", Default: "20", Desc: "page size"},
+		{Name: "page-size", Type: "int", Default: "20", Desc: "page size (1..200)"},
 		{Name: "page-token", Desc: "pagination cursor from previous response"},
 	},
 	Validate: func(ctx context.Context, rctx *common.RuntimeContext) error {
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
 		}
+		// page_size 前置校验：对齐后端 checkMaxKeys 的 (0, 200] 契约，避免 >200 触发服务端 ErrInvalidRequest。
+		if err := validateFileListPageSize(rctx.Int("page-size")); err != nil {
+			return err
+		}
 		// 设计原则三：<timestamp> 多格式 → 归一化为 RFC3339 UTC，回写到 flag 供 buildFileListParams 透传。
 		for _, f := range []string{"uploaded-since", "uploaded-until"} {
 			if strings.TrimSpace(rctx.Str(f)) == "" {

shortcuts/apps/apps_file_list_test.go

@@ -82,6 +82,34 @@ func TestAppsFileList_RequiresAppID(t *testing.T) {
 	}
 }
 
+// TestAppsFileList_PageSizeOutOfRange 验证 --page-size 超出 (0, 200] 契约时前置报 --page-size 校验错误，不发请求。
+func TestAppsFileList_PageSizeOutOfRange(t *testing.T) {
+	for _, ps := range []string{"0", "201", "500"} {
+		factory, stdout, _ := newAppsExecuteFactory(t)
+		err := runAppsShortcut(t, AppsFileList,
+			[]string{"+file-list", "--app-id", "app_x", "--page-size", ps, "--as", "user"}, factory, stdout)
+		var ve *errs.ValidationError
+		if !errors.As(err, &ve) {
+			t.Fatalf("page-size=%s: err = %T %v, want *errs.ValidationError", ps, err, err)
+		}
+		if ve.Param != "--page-size" {
+			t.Fatalf("page-size=%s: Param = %q, want --page-size", ps, ve.Param)
+		}
+	}
+}
+
+// TestAppsFileList_PageSizeBoundaryOK 验证边界值 1 与 200 通过校验（dry-run 不报错并把 page_size 下发）。
+func TestAppsFileList_PageSizeBoundaryOK(t *testing.T) {
+	for _, ps := range []string{"1", "200"} {
+		factory, stdout, _ := newAppsExecuteFactory(t)
+		if err := runAppsShortcut(t, AppsFileList,
+			[]string{"+file-list", "--app-id", "app_x", "--page-size", ps, "--dry-run", "--as", "user"},
+			factory, stdout); err != nil {
+			t.Fatalf("page-size=%s: dry-run err=%v", ps, err)
+		}
+	}
+}
+
 // 过滤器 + 分页全部进 query（size-gt/lt 走 int，uploaded_since/until 原样）。
 func TestAppsFileList_DryRunSendsFiltersAndPagination(t *testing.T) {
 	factory, stdout, _ := newAppsExecuteFactory(t)

shortcuts/apps/apps_file_upload.go

@@ -14,7 +14,6 @@ import (
 	"strings"
 
 	"github.com/larksuite/cli/errs"
-	"github.com/larksuite/cli/internal/cmdutil"
 	"github.com/larksuite/cli/shortcuts/common"
 )
 
@@ -47,21 +46,7 @@ var AppsFileUpload = common.Shortcut{
 		if _, err := requireAppID(rctx.Str("app-id")); err != nil {
 			return err
 		}
-		f := strings.TrimSpace(rctx.Str("file"))
-		if f == "" {
-			return errs.NewValidationError(errs.SubtypeInvalidArgument, "--file is required").WithParam("--file")
-		}
-		st, err := rctx.FileIO().Stat(f)
-		if err != nil {
-			return errs.NewValidationError(errs.SubtypeInvalidArgument, "--file: %v", err).WithParam("--file").WithCause(err)
-		}
-		if st.IsDir() {
-			return errs.NewValidationError(errs.SubtypeInvalidArgument, "--file must be a file, not a directory").WithParam("--file")
-		}
-		if st.Size() > fileUploadMaxBytes {
-			return errs.NewValidationError(errs.SubtypeInvalidArgument, "file size %d bytes exceeds the 100 MB upload limit", st.Size()).WithParam("--file")
-		}
-		return nil
+		return rctx.ValidateLocalFileFlag("file", fileUploadMaxBytes)
 	},
 	DryRun: func(ctx context.Context, rctx *common.RuntimeContext) *common.DryRunAPI {
 		appID, _ := requireAppID(rctx.Str("app-id"))
@@ -76,9 +61,9 @@ var AppsFileUpload = common.Shortcut{
 			return err
 		}
 		localPath := strings.TrimSpace(rctx.Str("file"))
-		content, err := cmdutil.ReadInputFile(rctx.FileIO(), localPath)
+		content, err := rctx.ReadLocalFileFlag("file", fileUploadMaxBytes)
 		if err != nil {
-			return errs.NewValidationError(errs.SubtypeInvalidArgument, "--file: %v", err).WithParam("--file").WithCause(err)
+			return err
 		}
 		fileName := filepath.Base(localPath)
 		contentType := mimeByExt(fileName)

shortcuts/apps/apps_file_upload_test.go

@@ -12,6 +12,7 @@ import (
 	"net/http/httptest"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"testing"
 
@@ -58,22 +59,17 @@ func TestAppsFileUpload_RejectsDirectory(t *testing.T) {
 	}
 }
 
-// TestAppsFileUpload_DryRunPreUpload 验证 dry-run 输出 POST file_pre_upload，body.file_name 取文件 basename。
+// TestAppsFileUpload_DryRunPreUpload verifies that dry-run validates the local
+// file and previews the pre-upload request without reading or uploading it.
 func TestAppsFileUpload_DryRunPreUpload(t *testing.T) {
-	// Validate 会 Stat --file（在 DryRun 之前），故 dry-run 也需要真实存在的文件。
-	dir := t.TempDir()
-	if err := os.WriteFile(filepath.Join(dir, "logo.png"), []byte("x"), 0o600); err != nil {
+	absolutePath := filepath.Join(t.TempDir(), "logo.png")
+	if err := os.WriteFile(absolutePath, []byte("not-read-by-dry-run"), 0o600); err != nil {
 		t.Fatal(err)
 	}
-	oldWD, _ := os.Getwd()
-	if err := os.Chdir(dir); err != nil {
-		t.Fatal(err)
-	}
-	t.Cleanup(func() { _ = os.Chdir(oldWD) })
 
 	factory, stdout, _ := newAppsExecuteFactory(t)
 	if err := runAppsShortcut(t, AppsFileUpload,
-		[]string{"+file-upload", "--app-id", "app_x", "--file", "logo.png", "--dry-run", "--as", "user"}, factory, stdout); err != nil {
+		[]string{"+file-upload", "--app-id", "app_x", "--file", absolutePath, "--dry-run", "--as", "user"}, factory, stdout); err != nil {
 		t.Fatalf("dry-run err=%v", err)
 	}
 	var env dryRunAPIEnvelope
@@ -87,6 +83,18 @@ func TestAppsFileUpload_DryRunPreUpload(t *testing.T) {
 	}
 }
 
+func TestAppsFileUpload_DryRunRejectsMissingFile(t *testing.T) {
+	missingAbsolutePath := filepath.Join(t.TempDir(), "does-not-exist", "logo.png")
+
+	factory, stdout, _ := newAppsExecuteFactory(t)
+	err := runAppsShortcut(t, AppsFileUpload,
+		[]string{"+file-upload", "--app-id", "app_x", "--file", missingAbsolutePath, "--dry-run", "--as", "user"}, factory, stdout)
+	var validationErr *errs.ValidationError
+	if !errors.As(err, &validationErr) || validationErr.Subtype != errs.SubtypeInvalidArgument || validationErr.Param != "--file" {
+		t.Fatalf("error = %T %v, want invalid_argument for --file", err, err)
+	}
+}
+
 // 三步直传：pre-upload → 客户端 PUT 字节 → callback。
 func TestAppsFileUpload_EndToEnd(t *testing.T) {
 	var putBody []byte
@@ -149,6 +157,142 @@ func TestAppsFileUpload_EndToEnd(t *testing.T) {
 	}
 }
 
+// TestAppsFileUpload_AcceptsAbsolutePath verifies that file-upload can read an
+// absolute path outside the current working directory.
+func TestAppsFileUpload_AcceptsAbsolutePath(t *testing.T) {
+	var putBody []byte
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPut {
+			w.WriteHeader(http.StatusMethodNotAllowed)
+			return
+		}
+		putBody, _ = io.ReadAll(r.Body)
+		w.Header().Set("ETag", `"etag-abs"`)
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer srv.Close()
+
+	// Keep the process cwd unchanged so the temporary file is outside it.
+	dir := t.TempDir()
+	absFile := filepath.Join(dir, "report.pdf")
+	if !filepath.IsAbs(absFile) {
+		t.Fatalf("test setup: %q is not absolute", absFile)
+	}
+	if err := os.WriteFile(absFile, []byte("PDFBYTES"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "POST", URL: "/open-apis/spark/v1/apps/app_x/storage/file_pre_upload",
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{"upload_url": srv.URL, "upload_id": "up-abs"}},
+	})
+	reg.Register(&httpmock.Stub{
+		Method: "POST", URL: "/open-apis/spark/v1/apps/app_x/storage/file_upload_callback",
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{
+			"file_name": "report.pdf", "path": "/1858537546760999.pdf", "size_bytes": 8,
+		}},
+	})
+
+	if err := runAppsShortcut(t, AppsFileUpload,
+		[]string{"+file-upload", "--app-id", "app_x", "--file", absFile, "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute with absolute path err=%v", err)
+	}
+	if string(putBody) != "PDFBYTES" {
+		t.Fatalf("PUT body = %q, want file bytes", putBody)
+	}
+}
+
+func TestAppsFileUpload_AcceptsParentRelativePathOutsideCWD(t *testing.T) {
+	var putBody []byte
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		putBody, _ = io.ReadAll(r.Body)
+		w.Header().Set("ETag", `"etag-parent"`)
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer srv.Close()
+
+	root := t.TempDir()
+	workDir := filepath.Join(root, "work")
+	if err := os.Mkdir(workDir, 0o755); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(filepath.Join(root, "report.pdf"), []byte("PARENT"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	oldWD, _ := os.Getwd()
+	if err := os.Chdir(workDir); err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _ = os.Chdir(oldWD) })
+
+	factory, stdout, reg := newAppsExecuteFactory(t)
+	reg.Register(&httpmock.Stub{
+		Method: "POST", URL: "/open-apis/spark/v1/apps/app_x/storage/file_pre_upload",
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{"upload_url": srv.URL, "upload_id": "up-parent"}},
+	})
+	reg.Register(&httpmock.Stub{
+		Method: "POST", URL: "/open-apis/spark/v1/apps/app_x/storage/file_upload_callback",
+		Body: map[string]interface{}{"code": 0, "data": map[string]interface{}{
+			"file_name": "report.pdf", "path": "/parent.pdf", "size_bytes": 6,
+		}},
+	})
+
+	if err := runAppsShortcut(t, AppsFileUpload,
+		[]string{"+file-upload", "--app-id", "app_x", "--file", filepath.Join("..", "report.pdf"), "--as", "user"}, factory, stdout); err != nil {
+		t.Fatalf("execute with parent-relative path err=%v", err)
+	}
+	if string(putBody) != "PARENT" {
+		t.Fatalf("PUT body = %q, want PARENT", putBody)
+	}
+}
+
+func TestAppsFileUpload_RejectsFileAboveLimit(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "too-large.bin")
+	f, err := os.Create(path)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := f.Truncate(fileUploadMaxBytes + 1); err != nil {
+		_ = f.Close()
+		t.Fatal(err)
+	}
+	if err := f.Close(); err != nil {
+		t.Fatal(err)
+	}
+
+	factory, stdout, _ := newAppsExecuteFactory(t)
+	err = runAppsShortcut(t, AppsFileUpload,
+		[]string{"+file-upload", "--app-id", "app_x", "--file", path, "--as", "user"}, factory, stdout)
+	var validationErr *errs.ValidationError
+	if !errors.As(err, &validationErr) || validationErr.Param != "--file" {
+		t.Fatalf("error = %T %v, want --file ValidationError", err, err)
+	}
+	if !strings.Contains(validationErr.Error(), "limit") {
+		t.Fatalf("error = %v, want size limit context", validationErr)
+	}
+}
+
+func TestAppsFileUpload_RejectsDeviceWithoutReadingIt(t *testing.T) {
+	if runtime.GOOS == "windows" {
+		t.Skip("/dev/zero is unavailable on Windows")
+	}
+	if _, err := os.Stat("/dev/zero"); err != nil {
+		t.Skipf("/dev/zero unavailable: %v", err)
+	}
+
+	factory, stdout, _ := newAppsExecuteFactory(t)
+	err := runAppsShortcut(t, AppsFileUpload,
+		[]string{"+file-upload", "--app-id", "app_x", "--file", "/dev/zero", "--as", "user"}, factory, stdout)
+	var validationErr *errs.ValidationError
+	if !errors.As(err, &validationErr) || validationErr.Param != "--file" {
+		t.Fatalf("error = %T %v, want --file ValidationError", err, err)
+	}
+	if !strings.Contains(validationErr.Error(), "regular file") {
+		t.Fatalf("error = %v, want non-regular-file context", validationErr)
+	}
+}
+
 // TestSanitizeUploadFileName_Cases 验证 sanitizeUploadFileName：空格转 %20、去 TOS 非法字符、全非法兜底、非 ASCII 百分号编码。
 func TestSanitizeUploadFileName_Cases(t *testing.T) {
 	cases := []struct{ in, want string }{

shortcuts/apps/cache_common.go

@@ -0,0 +1,99 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package apps
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"strings"
+	"time"
+
+	"github.com/larksuite/cli/internal/validate"
+	"github.com/larksuite/cli/shortcuts/common"
+)
+
+// 应用运行时缓存（Cache）调试命令共享件：路由 + 环境 flag + 渲染。
+//
+// 三条命令都走 spark OpenAPI `/apps/{app_id}/cache[/clear]`，按运行环境（env→dbBranch）隔离：
+// 环境 flag 用 cacheEnvFlag()（只 --environment，不带 db 家族的旧名 --env），env 值经 dbEnv 读、
+// 经 dbEnvParams 注入——get/delete 放 query，clear 放 body（省略即服务端自动选分支）。
+
+// appCachePath 返回缓存单 key 读/删 URL：cache（GET 读、DELETE 删，靠方法区分）。
+func appCachePath(appID string) string {
+	return fmt.Sprintf("%s/apps/%s/cache", apiBasePath, validate.EncodePathSegment(appID))
+}
+
+// appCacheClearPath 返回清空指定环境缓存 URL：cache/clear。
+func appCacheClearPath(appID string) string {
+	return fmt.Sprintf("%s/apps/%s/cache/clear", apiBasePath, validate.EncodePathSegment(appID))
+}
+
+// cacheEnvFlag 返回缓存命令的运行环境 flag。cache 是全新命令、从无旧名 --env，
+// 故只注册干净的 --environment（不带 db 家族那套隐藏 --env + 拒收逻辑）。
+// 省略即服务端按应用多环境状态自动选分支（多环境→dev，非多环境→online）。
+func cacheEnvFlag() common.Flag {
+	return common.Flag{
+		Name: "environment",
+		Enum: []string{"dev", "online"},
+		Desc: "target runtime environment; leave unset to auto-select (multi-env app uses dev, single-env uses online), or pass dev/online",
+	}
+}
+
+// cacheBool 防御性解析布尔：真 bool 直接用；若服务端把 exists 返成字符串 "true"/"false" 也归一成 bool，
+// 其它类型按 false。避免 exists 万一以字符串形态出现时被误判成未命中（hit→miss 翻转）。
+func cacheBool(v interface{}) bool {
+	switch x := v.(type) {
+	case bool:
+		return x
+	case string:
+		return strings.EqualFold(strings.TrimSpace(x), "true")
+	}
+	return false
+}
+
+// cacheInt 把服务端下发的数值字段归一成 int64（无法解析→nil）。本仓惯例：数值可能以字符串下发
+// （见 numericAsFloat 的 string 分支），若直接透传，--format json 的字段类型会随服务端 wire 形态漂移
+// （number ↔ string）。归一后输出类型恒定为数字或 null，消费方无需自己容忍字符串。
+func cacheInt(raw interface{}) interface{} {
+	if f, ok := numericAsFloat(raw); ok {
+		return int64(f)
+	}
+	return nil
+}
+
+// resolvedEnv 取服务端回吐的 resolved env；缺失时兜底成请求侧 --environment（可能为空）。
+// 省略 --environment 时服务端自动选分支，靠服务端回吐才知道实际命中 dev / online。
+func resolvedEnv(data map[string]interface{}, rctx *common.RuntimeContext) string {
+	if env := common.GetString(data, "env"); env != "" {
+		return env
+	}
+	return dbEnv(rctx)
+}
+
+// formatCacheTTL 把剩余 TTL（毫秒）格式化成 4m32s 这样的时长串；非数字返回 "—"。
+func formatCacheTTL(ms interface{}) string {
+	f, ok := numericAsFloat(ms)
+	if !ok {
+		return "—"
+	}
+	return (time.Duration(int64(f)) * time.Millisecond).String()
+}
+
+// printCacheValuePretty 把 value 反序列化后缩进展开（pretty 口径）；非 JSON 则原样打印。
+// 与「json 原样字符串、pretty 才反序列化」的设计一致。
+func printCacheValuePretty(w io.Writer, raw string) {
+	v := safeParseJSON(raw)
+	if s, ok := v.(string); ok {
+		fmt.Fprintln(w, s)
+		return
+	}
+	b, err := json.MarshalIndent(v, "", "  ")
+	if err != nil {
+		fmt.Fprintln(w, raw)
+		return
+	}
+	w.Write(b)
+	fmt.Fprintln(w)
+}

shortcuts/apps/file_common.go

@@ -14,6 +14,7 @@ import (
 	"time"
 
 	"github.com/larksuite/cli/errs"
+	"github.com/larksuite/cli/internal/transport"
 	"github.com/larksuite/cli/internal/validate"
 	"github.com/larksuite/cli/shortcuts/common"
 )
@@ -74,11 +75,9 @@ func normalizeTimestamp(raw string) (string, error) {
 	return "", errs.NewValidationError(errs.SubtypeInvalidArgument, "invalid timestamp %q (want relative 7d/2h/30s, date 2026-04-15, datetime 2026-04-15T10:00:00, or ISO 8601 with TZ)", s)
 }
 
-// newFileTransferClient 直传 / 直下对象存储 presigned URL 用（绕开 Lark 网关，无需 auth、无超时以容纳大文件）。
-//
-//nolint:forbidigo // presigned object-storage transfer bypasses the Lark gateway — raw http.Client is required (no Lark auth, no gateway routing); not a Lark API call, so RuntimeContext.DoAPI does not apply.
+//nolint:forbidigo // Presigned transfers use the external HTTP policy.
 func newFileTransferClient() *http.Client {
-	return &http.Client{Transport: http.DefaultTransport}
+	return transport.NewExternalHTTPClient(0)
 }
 
 // URL helpers for the file (storage) CLI commands.

shortcuts/apps/file_common_test.go

@@ -0,0 +1,79 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package apps
+
+import (
+	"context"
+	"net/http"
+	"testing"
+
+	exttransport "github.com/larksuite/cli/extension/transport"
+)
+
+type appsExternalProvider struct {
+	interceptor exttransport.Interceptor
+}
+
+func (p appsExternalProvider) Name() string { return "apps-external-test" }
+
+func (p appsExternalProvider) ResolveInterceptor(context.Context) exttransport.Interceptor {
+	return p.interceptor
+}
+
+func (appsExternalProvider) SupportsRequestClass(class exttransport.RequestClass) bool {
+	return class == exttransport.RequestClassExternal
+}
+
+type appsExternalInterceptor struct {
+	calls int
+}
+
+func (i *appsExternalInterceptor) PreRoundTrip(req *http.Request) func(*http.Response, error) {
+	i.calls++
+	req.Header.Set("X-External-Route", "1")
+	return nil
+}
+
+type appsRoundTripFunc func(*http.Request) (*http.Response, error)
+
+func (f appsRoundTripFunc) RoundTrip(req *http.Request) (*http.Response, error) {
+	return f(req)
+}
+
+func TestFileTransferClientUsesExternalRequestClass(t *testing.T) {
+	t.Setenv("LARKSUITE_CLI_CONFIG_DIR", t.TempDir())
+	t.Setenv("LARK_CLI_NO_PROXY", "")
+
+	previousProvider := exttransport.GetProvider()
+	interceptor := &appsExternalInterceptor{}
+	exttransport.Register(appsExternalProvider{interceptor: interceptor})
+	t.Cleanup(func() { exttransport.Register(previousProvider) })
+
+	previousTransport := http.DefaultTransport
+	var receivedHeader string
+	http.DefaultTransport = appsRoundTripFunc(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/presigned/file", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	resp, err := newFileTransferClient().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")
+	}
+}

shortcuts/apps/shortcuts.go

@@ -64,6 +64,9 @@ func Shortcuts() []common.Shortcut {
 		AppsFileUpload,
 		AppsFileDelete,
 		AppsFileQuotaGet,
+		AppsCacheGet,
+		AppsCacheDelete,
+		AppsCacheClear,
 		AppsGitCredentialInit,
 		AppsGitCredentialList,
 		AppsGitCredentialRemove,

shortcuts/apps/shortcuts_test.go

@@ -20,13 +20,14 @@ import (
 //   - 3 git-credential
 //   - 5 session（create/list/get/stop/chat）+ 1 session-messages-list
 //   - 8 openapi-key（list/get/create/update/enable/disable/delete/reset）
+//   - 3 cache（get/delete/clear）
 //   - 3 plugin（install/uninstall/list）
 //   - 6 automation（list/get/create/update/enable/disable）
-//   - 9 role（role CRUD + role-member list/add/remove + role-match-list）= 79。
-func TestAppsShortcuts_Returns79(t *testing.T) {
+//   - 9 role（role CRUD + role-member list/add/remove + role-match-list）= 82。
+func TestAppsShortcuts_Returns82(t *testing.T) {
 	got := Shortcuts()
-	if len(got) != 79 {
-		t.Fatalf("Shortcuts() returned %d entries, want 79", len(got))
+	if len(got) != 82 {
+		t.Fatalf("Shortcuts() returned %d entries, want 82", len(got))
 	}
 }