diff --git a/shortcuts/sheets/backward/lark_sheets_row_column_management.go b/shortcuts/sheets/backward/lark_sheets_row_column_management.go
index ea1e913a8..f2a822c2e 100644
--- a/shortcuts/sheets/backward/lark_sheets_row_column_management.go
+++ b/shortcuts/sheets/backward/lark_sheets_row_column_management.go
@@ -309,9 +309,11 @@ var SheetDeleteDimension = common.Shortcut{
 	Service:     "sheets",
 	Command:     "+delete-dimension",
 	Description: "Delete rows or columns",
-	Risk:        "write",
-	Scopes:      []string{"sheets:spreadsheet:write_only", "sheets:spreadsheet:read"},
-	AuthTypes:   []string{"user", "bot"},
+	// Deleting rows/columns is an irreversible structural change, so it
+	// requires the same confirmation gate (--yes) as +delete-sheet.
+	Risk:      "high-risk-write",
+	Scopes:    []string{"sheets:spreadsheet:write_only", "sheets:spreadsheet:read"},
+	AuthTypes: []string{"user", "bot"},
 	Flags: []common.Flag{
 		{Name: "url", Desc: "spreadsheet URL"},
 		{Name: "spreadsheet-token", Desc: "spreadsheet token"},
diff --git a/shortcuts/sheets/backward/lark_sheets_sheet_dimension_test.go b/shortcuts/sheets/backward/lark_sheets_sheet_dimension_test.go
index 51b13ff5b..7e289df5b 100644
--- a/shortcuts/sheets/backward/lark_sheets_sheet_dimension_test.go
+++ b/shortcuts/sheets/backward/lark_sheets_sheet_dimension_test.go
@@ -6,12 +6,14 @@ package backward
 import (
 	"context"
 	"encoding/json"
+	"net/http"
 	"strconv"
 	"strings"
 	"testing"
 
 	"github.com/spf13/cobra"
 
+	"github.com/larksuite/cli/errs"
 	"github.com/larksuite/cli/internal/cmdutil"
 	"github.com/larksuite/cli/internal/httpmock"
 	"github.com/larksuite/cli/shortcuts/common"
@@ -911,6 +913,7 @@ func TestSheetDeleteDimensionExecuteSuccess(t *testing.T) {
 		"--dimension", "ROWS",
 		"--start-index", "3",
 		"--end-index", "7",
+		"--yes",
 		"--as", "user",
 	}, f, stdout)
 	if err != nil {
@@ -948,6 +951,7 @@ func TestSheetDeleteDimensionExecuteWithURL(t *testing.T) {
 		"--dimension", "COLUMNS",
 		"--start-index", "1",
 		"--end-index", "2",
+		"--yes",
 		"--as", "user",
 	}, f, stdout)
 	if err != nil {
@@ -971,9 +975,116 @@ func TestSheetDeleteDimensionExecuteAPIError(t *testing.T) {
 		"--dimension", "ROWS",
 		"--start-index", "3",
 		"--end-index", "7",
+		"--yes",
 		"--as", "user",
 	}, f, nil)
-	if err == nil {
-		t.Fatal("expected API error, got nil")
+	p, ok := errs.ProblemOf(err)
+	if !ok {
+		t.Fatalf("error type = %T, want typed problem", err)
+	}
+	if p.Category != errs.CategoryAPI {
+		t.Fatalf("got category=%q, want %q", p.Category, errs.CategoryAPI)
+	}
+	if p.Code != 90001 {
+		t.Fatalf("got code=%d, want 90001", p.Code)
+	}
+}
+
+// ── DeleteDimension: high-risk-write confirmation gate (issue #50) ────────────
+
+// TestSheetDeleteDimensionRiskIsHighRiskWrite locks the risk level so a
+// regression cannot silently drop +delete-dimension back below the confirmation
+// gate. Deleting rows/columns is an irreversible structural change and must
+// share the same risk tier as +delete-sheet.
+func TestSheetDeleteDimensionRiskIsHighRiskWrite(t *testing.T) {
+	t.Parallel()
+	if SheetDeleteDimension.Risk != "high-risk-write" {
+		t.Fatalf("SheetDeleteDimension.Risk = %q, want \"high-risk-write\"", SheetDeleteDimension.Risk)
+	}
+}
+
+// TestSheetDeleteDimensionWithoutYesRequiresConfirmation verifies that running
+// +delete-dimension without --yes is blocked by the high-risk confirmation gate
+// and never reaches the server. No HTTP stub is registered on purpose: the gate
+// must short-circuit before Execute, so any outbound request would itself be a
+// failure. Reaching a "requires confirmation" error proves the gate fired first.
+func TestSheetDeleteDimensionWithoutYesRequiresConfirmation(t *testing.T) {
+	f, _, _, _ := cmdutil.TestFactory(t, sheetsTestConfig())
+
+	err := mountAndRunSheets(t, SheetDeleteDimension, []string{
+		"+delete-dimension",
+		"--spreadsheet-token", "shtTOKEN",
+		"--sheet-id", "sheet1",
+		"--dimension", "ROWS",
+		"--start-index", "3",
+		"--end-index", "7",
+		"--as", "user",
+	}, f, nil)
+	p, ok := errs.ProblemOf(err)
+	if !ok {
+		t.Fatalf("error type = %T, want typed problem (gate must produce a typed confirmation error)", err)
+	}
+	if p.Category != errs.CategoryConfirmation || p.Subtype != errs.SubtypeConfirmationRequired {
+		t.Fatalf("got category=%q subtype=%q, want %q/%q",
+			p.Category, p.Subtype, errs.CategoryConfirmation, errs.SubtypeConfirmationRequired)
+	}
+}
+
+// TestSheetDeleteDimensionWithYesExecutes verifies that passing --yes satisfies
+// the confirmation gate and the delete is performed.
+func TestSheetDeleteDimensionWithYesExecutes(t *testing.T) {
+	f, stdout, _, reg := cmdutil.TestFactory(t, sheetsTestConfig())
+	called := false
+	reg.Register(&httpmock.Stub{
+		Method:  "DELETE",
+		URL:     "/open-apis/sheets/v2/spreadsheets/shtTOKEN/dimension_range",
+		Body:    map[string]interface{}{"code": 0, "msg": "success", "data": map[string]interface{}{"delCount": float64(5), "majorDimension": "ROWS"}},
+		OnMatch: func(*http.Request) { called = true },
+	})
+
+	err := mountAndRunSheets(t, SheetDeleteDimension, []string{
+		"+delete-dimension",
+		"--spreadsheet-token", "shtTOKEN",
+		"--sheet-id", "sheet1",
+		"--dimension", "ROWS",
+		"--start-index", "3",
+		"--end-index", "7",
+		"--yes",
+		"--as", "user",
+	}, f, stdout)
+	if err != nil {
+		t.Fatalf("unexpected error with --yes: %v", err)
+	}
+	if !called {
+		t.Fatal("API should be called once confirmation is satisfied with --yes")
+	}
+	if !strings.Contains(stdout.String(), `"delCount"`) {
+		t.Fatalf("stdout missing delCount: %s", stdout.String())
+	}
+}
+
+// TestSheetDeleteDimensionDryRunBypassesConfirmation verifies that --dry-run
+// previews the delete without --yes and without hitting the server: dry-run is
+// the sanctioned safe-preview path for high-risk operations, so the confirmation
+// gate must not block it. No HTTP stub is registered: a dry-run that reached the
+// network would be a failure.
+func TestSheetDeleteDimensionDryRunBypassesConfirmation(t *testing.T) {
+	f, stdout, _, _ := cmdutil.TestFactory(t, sheetsTestConfig())
+
+	err := mountAndRunSheets(t, SheetDeleteDimension, []string{
+		"+delete-dimension",
+		"--spreadsheet-token", "shtTOKEN",
+		"--sheet-id", "sheet1",
+		"--dimension", "ROWS",
+		"--start-index", "3",
+		"--end-index", "7",
+		"--dry-run",
+		"--as", "user",
+	}, f, stdout)
+	if err != nil {
+		t.Fatalf("dry-run should not require --yes, got: %v", err)
+	}
+	if !strings.Contains(stdout.String(), "DELETE") {
+		t.Fatalf("dry-run output should preview the DELETE request: %s", stdout.String())
 	}
 }