feat(sheets): add +get-revision shortcut

Return a spreadsheet's current document revision without pulling the full
sub-sheet listing. +get-revision is a read-only derivative over
get_workbook_structure (the lightest read — token only, no range) that
projects the response down to the single revision field.

Adds flag-defs entries and a unit test for the projection helper.

shortcuts/sheets/data/flag-defs.json

@@ -25,6 +25,32 @@
       }
     ]
   },
+  "+get-revision": {
+    "risk": "read",
+    "flags": [
+      {
+        "name": "url",
+        "kind": "public",
+        "type": "string",
+        "required": "xor",
+        "desc": "Spreadsheet locator"
+      },
+      {
+        "name": "spreadsheet-token",
+        "kind": "public",
+        "type": "string",
+        "required": "xor",
+        "desc": "Spreadsheet locator"
+      },
+      {
+        "name": "dry-run",
+        "kind": "system",
+        "type": "bool",
+        "required": "optional",
+        "desc": ""
+      }
+    ]
+  },
   "+sheet-create": {
     "risk": "write",
     "flags": [

shortcuts/sheets/flag_defs_gen.go

@@ -976,4 +976,12 @@ var flagDefs = map[string]commandDef{
 			{Name: "dry-run", Kind: "system", Type: "bool", Required: "optional"},
 		},
 	},
+	"+get-revision": {
+		Risk: "read",
+		Flags: []flagDef{
+			{Name: "url", Kind: "public", Type: "string", Required: "xor", Desc: "Spreadsheet locator"},
+			{Name: "spreadsheet-token", Kind: "public", Type: "string", Required: "xor", Desc: "Spreadsheet locator"},
+			{Name: "dry-run", Kind: "system", Type: "bool", Required: "optional"},
+		},
+	},
 }

shortcuts/sheets/lark_sheet_get_revision.go

@@ -0,0 +1,83 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package sheets
+
+import (
+	"context"
+
+	"github.com/larksuite/cli/errs"
+	"github.com/larksuite/cli/shortcuts/common"
+)
+
+// ─── lark_sheet_get_revision ───────────────────────────────────────────
+//
+// GetRevision is a read-only derivative over get_workbook_structure that
+// projects out only the document revision (version number). The backend
+// surfaces `revision` on every read/write tool response, so this shortcut
+// needs no dedicated backend tool — it issues the lightest existing read
+// (no range, just the workbook token) and narrows the payload to the single
+// field callers want.
+//
+// The revision is the anchor for recover / undo. Callers that have just run a
+// write already have it in that write's response; +get-revision is the
+// explicit, zero-side-effect way to fetch the current value on its own.
+var GetRevision = common.Shortcut{
+	Service:     "sheets",
+	Command:     "+get-revision",
+	Description: "Get the spreadsheet's current document revision (version number).",
+	Risk:        "read",
+	Scopes:      []string{"sheets:spreadsheet:read"},
+	AuthTypes:   []string{"user", "bot"},
+	HasFormat:   true,
+	Flags:       flagsFor("+get-revision"),
+	Validate: func(ctx context.Context, runtime *common.RuntimeContext) error {
+		_, err := resolveSpreadsheetToken(runtime)
+		return err
+	},
+	DryRun: func(ctx context.Context, runtime *common.RuntimeContext) *common.DryRunAPI {
+		token, _ := resolveSpreadsheetToken(runtime)
+		return invokeToolDryRun(token, ToolKindRead, "get_workbook_structure", map[string]interface{}{
+			"excel_id": token,
+		})
+	},
+	Execute: func(ctx context.Context, runtime *common.RuntimeContext) error {
+		token, err := resolveSpreadsheetTokenExec(runtime)
+		if err != nil {
+			return err
+		}
+		out, err := callTool(ctx, runtime, token, ToolKindRead, "get_workbook_structure", map[string]interface{}{
+			"excel_id": token,
+		})
+		if err != nil {
+			return err
+		}
+		rev, err := projectRevision(out)
+		if err != nil {
+			return err
+		}
+		runtime.Out(map[string]interface{}{"revision": rev}, nil)
+		return nil
+	},
+	Tips: []string{
+		"The revision is the version anchor for recover / undo; every read and write tool response already carries it.",
+	},
+}
+
+// projectRevision narrows a get_workbook_structure response to its `revision`
+// field. An absent revision means the backend predates revision injection on
+// read responses; surface that as an explicit error rather than emitting a
+// silent null.
+func projectRevision(out interface{}) (interface{}, error) {
+	obj, ok := out.(map[string]interface{})
+	if !ok {
+		return nil, errs.NewInternalError(errs.SubtypeInvalidResponse,
+			"get_workbook_structure returned non-object output")
+	}
+	rev, ok := obj["revision"]
+	if !ok {
+		return nil, errs.NewInternalError(errs.SubtypeInvalidResponse,
+			"get_workbook_structure did not return a revision (backend may not support it yet)")
+	}
+	return rev, nil
+}

shortcuts/sheets/lark_sheet_get_revision_test.go

@@ -0,0 +1,37 @@
+// Copyright (c) 2026 Lark Technologies Pte. Ltd.
+// SPDX-License-Identifier: MIT
+
+package sheets
+
+import "testing"
+
+func TestProjectRevision(t *testing.T) {
+	t.Parallel()
+
+	t.Run("extracts revision from a workbook-structure object", func(t *testing.T) {
+		out := map[string]interface{}{
+			"revision": float64(60),
+			"sheets":   []interface{}{map[string]interface{}{"sheet_id": "Nh34WX"}},
+		}
+		got, err := projectRevision(out)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if got != float64(60) {
+			t.Errorf("revision = %v, want 60", got)
+		}
+	})
+
+	t.Run("errors when revision is absent", func(t *testing.T) {
+		out := map[string]interface{}{"sheets": []interface{}{}}
+		if _, err := projectRevision(out); err == nil {
+			t.Error("expected an error when revision is missing, got nil")
+		}
+	})
+
+	t.Run("errors on a non-object output", func(t *testing.T) {
+		if _, err := projectRevision("not-an-object"); err == nil {
+			t.Error("expected an error for non-object output, got nil")
+		}
+	})
+}

shortcuts/sheets/shortcuts.go

@@ -70,6 +70,7 @@ func shortcutList() []common.Shortcut {
 	return []common.Shortcut{
 		// lark_sheet_workbook
 		WorkbookInfo,
+		GetRevision,
 		SheetCreate,
 		SheetDelete,
 		SheetRename,