Add a setting to disable auth mode validation on startup (#5358)

packages/cli/src/ui/App.test.tsx

@@ -26,6 +26,7 @@ import { Tips } from './components/Tips.js';
 import { checkForUpdates, UpdateObject } from './utils/updateCheck.js';
 import { EventEmitter } from 'events';
 import { updateEventEmitter } from '../utils/updateEventEmitter.js';
+import * as auth from '../config/auth.js';
 
 // Define a more complete mock server config based on actual Config
 interface MockServerConfig {
@@ -232,6 +233,10 @@ vi.mock('./utils/updateCheck.js', () => ({
   checkForUpdates: vi.fn(),
 }));
 
+vi.mock('./config/auth.js', () => ({
+  validateAuthMethod: vi.fn(),
+}));
+
 const mockedCheckForUpdates = vi.mocked(checkForUpdates);
 const { isGitRepository: mockedIsGitRepository } = vi.mocked(
   await import('@google/gemini-cli-core'),
@@ -1005,4 +1010,50 @@ describe('App UI', () => {
       expect(lastFrame()).toContain('5 errors');
     });
   });
+
+  describe('auth validation', () => {
+    it('should call validateAuthMethod when useExternalAuth is false', async () => {
+      const validateAuthMethodSpy = vi.spyOn(auth, 'validateAuthMethod');
+      mockSettings = createMockSettings({
+        workspace: {
+          selectedAuthType: 'USE_GEMINI' as AuthType,
+          useExternalAuth: false,
+          theme: 'Default',
+        },
+      });
+
+      const { unmount } = render(
+        <App
+          config={mockConfig as unknown as ServerConfig}
+          settings={mockSettings}
+          version={mockVersion}
+        />,
+      );
+      currentUnmount = unmount;
+
+      expect(validateAuthMethodSpy).toHaveBeenCalledWith('USE_GEMINI');
+    });
+
+    it('should NOT call validateAuthMethod when useExternalAuth is true', async () => {
+      const validateAuthMethodSpy = vi.spyOn(auth, 'validateAuthMethod');
+      mockSettings = createMockSettings({
+        workspace: {
+          selectedAuthType: 'USE_GEMINI' as AuthType,
+          useExternalAuth: true,
+          theme: 'Default',
+        },
+      });
+
+      const { unmount } = render(
+        <App
+          config={mockConfig as unknown as ServerConfig}
+          settings={mockSettings}
+          version={mockVersion}
+        />,
+      );
+      currentUnmount = unmount;
+
+      expect(validateAuthMethodSpy).not.toHaveBeenCalled();
+    });
+  });
 });

packages/cli/src/ui/App.tsx

@@ -234,14 +234,19 @@ const App = ({ config, settings, startupWarnings = [], version }: AppProps) => {
   } = useAuthCommand(settings, setAuthError, config);
 
   useEffect(() => {
-    if (settings.merged.selectedAuthType) {
+    if (settings.merged.selectedAuthType && !settings.merged.useExternalAuth) {
       const error = validateAuthMethod(settings.merged.selectedAuthType);
       if (error) {
         setAuthError(error);
         openAuthDialog();
       }
     }
-  }, [settings.merged.selectedAuthType, openAuthDialog, setAuthError]);
+  }, [
+    settings.merged.selectedAuthType,
+    settings.merged.useExternalAuth,
+    openAuthDialog,
+    setAuthError,
+  ]);
 
   // Sync user tier from config when authentication changes
   useEffect(() => {