diff --git a/shortcuts/application/shortcuts.go b/shortcuts/application/shortcuts.go
index 549455d0a..f6fdc9b63 100644
--- a/shortcuts/application/shortcuts.go
+++ b/shortcuts/application/shortcuts.go
@@ -12,5 +12,6 @@ func Shortcuts() []common.Shortcut {
 	return []common.Shortcut{
 		SlashCommandList,
 		SlashCommandCreate,
+		SlashCommandUpdate,
 	}
 }
diff --git a/shortcuts/application/slash_command_update.go b/shortcuts/application/slash_command_update.go
new file mode 100644
index 000000000..369292791
--- /dev/null
+++ b/shortcuts/application/slash_command_update.go
@@ -0,0 +1,119 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package application
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"strings"
+
+	"github.com/larksuite/cli/errs"
+	"github.com/larksuite/cli/internal/validate"
+	"github.com/larksuite/cli/shortcuts/common"
+)
+
+// validateUpdateTarget enforces: exactly one of --command-id/--command, and at
+// least one editable field; --description-i18n requires --description (PATCH
+// replaces the whole description object - sending i18n alone would drop
+// default_value; conservative rule, see spec amendment #3).
+func validateUpdateTarget(runtime *common.RuntimeContext) error {
+	id := strings.TrimSpace(runtime.Str("command-id"))
+	name := strings.TrimSpace(runtime.Str("command"))
+	if (id == "") == (name == "") {
+		return errs.NewValidationError(errs.SubtypeInvalidArgument,
+			"provide exactly one of --command-id or --command").WithParam("--command-id")
+	}
+	if name != "" {
+		if err := validateCommandName(name, "--command"); err != nil {
+			return err
+		}
+	}
+	hasDesc := strings.TrimSpace(runtime.Str("description")) != ""
+	hasI18n := len(runtime.StrArray("description-i18n")) > 0
+	hasIcon := strings.TrimSpace(runtime.Str("icon-key")) != ""
+	if !hasDesc && !hasI18n && !hasIcon {
+		return errs.NewValidationError(errs.SubtypeInvalidArgument,
+			"provide at least one of --description / --description-i18n / --icon-key").WithParam("--description")
+	}
+	if hasI18n && !hasDesc {
+		return errs.NewValidationError(errs.SubtypeInvalidArgument,
+			"--description-i18n requires --description: PATCH replaces the whole description object, so default_value must be provided together").WithParam("--description-i18n")
+	}
+	if _, err := parseDescriptionI18n(runtime.StrArray("description-i18n")); err != nil {
+		return err
+	}
+	return nil
+}
+
+// SlashCommandUpdate updates description/i18n/icon of an existing slash command.
+var SlashCommandUpdate = common.Shortcut{
+	Service:     "application",
+	Command:     "+slash-command-update",
+	Description: "Update description / localized descriptions / icon of a slash command on the current bound app, addressed by --command-id or by name via --command",
+	Risk:        "write",
+	BotScopes:   []string{"application:app_slash_command:write"},
+	ConditionalBotScopes: []string{
+		"application:app_slash_command:read", // only the --command by-name path lists to resolve the id
+	},
+	AuthTypes: []string{"bot", "user"},
+	Flags: []common.Flag{
+		{Name: "command-id", Desc: "target command_id (from +slash-command-list or create output); mutually exclusive with --command"},
+		{Name: "command", Desc: "target command name WITHOUT leading slash; resolved via live list (needs read scope); mutually exclusive with --command-id"},
+		{Name: "description", Desc: "new default description (description.default_value)"},
+		{Name: "description-i18n", Type: "string_array", Desc: "localized description, repeatable <lang>=<text>; REPLACES the whole i18n map (missing languages are dropped); requires --description"},
+		{Name: "icon-key", Desc: "new icon key (invalid keys rejected server-side with code 40000031)"},
+	},
+	Tips: []string{
+		`lark-cli application +slash-command-update --command greet --description "new text" --as bot`,
+		"PATCH is field-level partial: fields you do not pass are preserved server-side",
+		"the command NAME itself cannot be changed (API limitation): rename = delete + create (new command_id)",
+	},
+	Validate: func(ctx context.Context, runtime *common.RuntimeContext) error {
+		return validateUpdateTarget(runtime)
+	},
+	DryRun: func(ctx context.Context, runtime *common.RuntimeContext) *common.DryRunAPI {
+		i18n, err := parseDescriptionI18n(runtime.StrArray("description-i18n"))
+		if err != nil {
+			return common.NewDryRunAPI().Set("error", err.Error())
+		}
+		body := buildSlashCommandBody("", runtime.Str("description"), i18n, runtime.Str("icon-key"))
+		d := common.NewDryRunAPI()
+		target := runtime.Str("command-id")
+		if target == "" {
+			d.Desc(fmt.Sprintf("resolve command_id by name %q via GET list first", runtime.Str("command"))).
+				GET(slashCommandBasePath)
+			target = "<resolved_command_id>"
+		}
+		return d.PATCH(slashCommandBasePath + "/" + target).Body(body)
+	},
+	Execute: func(ctx context.Context, runtime *common.RuntimeContext) error {
+		id := strings.TrimSpace(runtime.Str("command-id"))
+		if id == "" {
+			resolved, _, err := resolveCommandID(runtime, strings.TrimSpace(runtime.Str("command")))
+			if err != nil {
+				return err
+			}
+			id = resolved
+		}
+		i18n, err := parseDescriptionI18n(runtime.StrArray("description-i18n"))
+		if err != nil {
+			return err
+		}
+		body := buildSlashCommandBody("", runtime.Str("description"), i18n, runtime.Str("icon-key"))
+		data, err := runtime.CallAPITyped("PATCH", slashCommandBasePath+"/"+validate.EncodePathSegment(id), nil, body)
+		if err != nil {
+			return err
+		}
+		if data == nil {
+			data = map[string]interface{}{}
+		}
+		data["action"] = "updated"
+		fmt.Fprintln(runtime.IO().ErrOut, clientCacheHint)
+		runtime.OutFormat(data, nil, func(w io.Writer) {
+			fmt.Fprintf(w, "updated /%v (command_id: %v)\n", data["command"], data["command_id"])
+		})
+		return nil
+	},
+}
diff --git a/shortcuts/application/slash_command_update_test.go b/shortcuts/application/slash_command_update_test.go
new file mode 100644
index 000000000..7533bafbd
--- /dev/null
+++ b/shortcuts/application/slash_command_update_test.go
@@ -0,0 +1,79 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package application
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+
+	"github.com/larksuite/cli/errs"
+	"github.com/larksuite/cli/internal/cmdutil"
+)
+
+func TestSlashCommandUpdate_ByID(t *testing.T) {
+	f, stdout, _, reg := cmdutil.TestFactory(t, appTestConfig())
+	reg.Register(patchOKStub("id1"))
+
+	err := mountAndRun(t, SlashCommandUpdate, []string{"+slash-command-update",
+		"--command-id", "id1", "--description", "new", "--format", "json", "--as", "bot"}, f, stdout)
+	if err != nil {
+		t.Fatalf("execute: %v", err)
+	}
+	var got map[string]interface{}
+	if err := json.Unmarshal(stdout.Bytes(), &got); err != nil {
+		t.Fatalf("json: %v", err)
+	}
+	data := got["data"].(map[string]interface{})
+	if data["action"] != "updated" {
+		t.Fatalf("action = %v", data["action"])
+	}
+}
+
+func TestSlashCommandUpdate_ByName(t *testing.T) {
+	f, stdout, _, reg := cmdutil.TestFactory(t, appTestConfig())
+	reg.Register(listStub([]interface{}{sampleItem("greet", "id9")}))
+	reg.Register(patchOKStub("id9"))
+
+	err := mountAndRun(t, SlashCommandUpdate, []string{"+slash-command-update",
+		"--command", "greet", "--icon-key", "skill_outlined", "--format", "json", "--as", "bot"}, f, stdout)
+	if err != nil {
+		t.Fatalf("execute: %v", err)
+	}
+}
+
+func TestSlashCommandUpdate_ByNameNotFound(t *testing.T) {
+	f, stdout, _, reg := cmdutil.TestFactory(t, appTestConfig())
+	reg.Register(listStub(nil))
+
+	err := mountAndRun(t, SlashCommandUpdate, []string{"+slash-command-update",
+		"--command", "nope", "--description", "x", "--as", "bot"}, f, stdout)
+	if err == nil || !strings.Contains(err.Error(), "not found") {
+		t.Fatalf("expected not found, got %v", err)
+	}
+}
+
+func TestSlashCommandUpdate_Validate(t *testing.T) {
+	f, stdout, _, _ := cmdutil.TestFactory(t, appTestConfig())
+	cases := []struct {
+		name string
+		args []string
+	}{
+		{"both id and name", []string{"+slash-command-update", "--command-id", "id1", "--command", "greet", "--description", "x", "--as", "bot"}},
+		{"neither id nor name", []string{"+slash-command-update", "--description", "x", "--as", "bot"}},
+		{"no editable field", []string{"+slash-command-update", "--command-id", "id1", "--as", "bot"}},
+		{"i18n without description", []string{"+slash-command-update", "--command-id", "id1", "--description-i18n", "zh_cn=x", "--as", "bot"}},
+	}
+	for _, c := range cases {
+		err := mountAndRun(t, SlashCommandUpdate, c.args, f, stdout)
+		if err == nil {
+			t.Errorf("%s: expected validation error", c.name)
+			continue
+		}
+		p, ok := errs.ProblemOf(err)
+		if !ok || p.Category != errs.CategoryValidation {
+			t.Errorf("%s: expected validation problem, got %v", c.name, err)
+		}
+	}
+}