Followup from #10719 (#13243)

packages/cli/src/config/config.test.ts

@@ -22,6 +22,7 @@ import type { Settings } from './settings.js';
 import * as ServerConfig from '@google/gemini-cli-core';
 import { isWorkspaceTrusted } from './trustedFolders.js';
 import { ExtensionManager } from './extension-manager.js';
+import { RESUME_LATEST } from '../utils/sessionUtils.js';
 
 vi.mock('./trustedFolders.js', () => ({
   isWorkspaceTrusted: vi
@@ -482,6 +483,20 @@ describe('parseArguments', () => {
     }
   });
 
+  it('should return RESUME_LATEST constant when --resume is passed without a value', async () => {
+    const originalIsTTY = process.stdin.isTTY;
+    process.stdin.isTTY = true; // Make it interactive to avoid validation error
+    process.argv = ['node', 'script.js', '--resume'];
+
+    try {
+      const argv = await parseArguments({} as Settings);
+      expect(argv.resume).toBe(RESUME_LATEST);
+      expect(argv.resume).toBe('latest');
+    } finally {
+      process.stdin.isTTY = originalIsTTY;
+    }
+  });
+
   it('should support comma-separated values for --allowed-tools', async () => {
     process.argv = [
       'node',

packages/cli/src/config/config.ts

@@ -37,6 +37,7 @@ import { getCliVersion } from '../utils/version.js';
 import { loadSandboxConfig } from './sandboxConfig.js';
 import { resolvePath } from '../utils/resolvePath.js';
 import { appEvents } from '../utils/events.js';
+import { RESUME_LATEST } from '../utils/sessionUtils.js';
 
 import { isWorkspaceTrusted } from './trustedFolders.js';
 import { createPolicyEngineConfig } from './policy.js';
@@ -61,7 +62,7 @@ export interface CliArgs {
   experimentalAcp: boolean | undefined;
   extensions: string[] | undefined;
   listExtensions: boolean | undefined;
-  resume: string | 'latest' | undefined;
+  resume: string | typeof RESUME_LATEST | undefined;
   listSessions: boolean | undefined;
   deleteSession: string | undefined;
   includeDirectories: string[] | undefined;
@@ -189,7 +190,7 @@ export async function parseArguments(settings: Settings): Promise<CliArgs> {
             // When --resume not passed at all: this `coerce` function is not called at all, and
             //   `yargsInstance.argv.resume` is undefined.
             if (value === '') {
-              return 'latest';
+              return RESUME_LATEST;
             }
             return value;
           },