feat(core): remove unnecessary login verbiage from Code Assist auth (google-gemini#19861)

Author: NTaylorMullen

packages/core/src/code_assist/oauth2.ts

@@ -271,7 +271,7 @@ async function initOauthClient(
 
     await triggerPostAuthCallbacks(client.credentials);
   } else {
-    const userConsent = await getConsentForOauth('Code Assist login required.');
+    const userConsent = await getConsentForOauth('');
     if (!userConsent) {
       throw new FatalCancellationError('Authentication cancelled by user.');
     }
@@ -281,8 +281,7 @@ async function initOauthClient(
     coreEvents.emit(CoreEvent.UserFeedback, {
       severity: 'info',
       message:
-        `\n\nCode Assist login required.\n` +
-        `Attempting to open authentication page in your browser.\n` +
+        `\n\nAttempting to open authentication page in your browser.\n` +
         `Otherwise navigate to:\n\n${webLogin.authUrl}\n\n\n`,
     });
     try {

packages/core/src/utils/authConsent.test.ts

@@ -56,6 +56,25 @@ describe('getConsentForOauth', () => {
       );
     });
 
+    it('should handle empty prompt correctly', async () => {
+      const mockEmitConsentRequest = vi.spyOn(coreEvents, 'emitConsentRequest');
+      vi.spyOn(coreEvents, 'listenerCount').mockReturnValue(1);
+
+      mockEmitConsentRequest.mockImplementation((payload) => {
+        payload.onConfirm(true);
+      });
+
+      await getConsentForOauth('');
+
+      expect(mockEmitConsentRequest).toHaveBeenCalledWith(
+        expect.objectContaining({
+          prompt: expect.stringMatching(
+            /^Opening authentication page in your browser\./,
+          ),
+        }),
+      );
+    });
+
     it('should return false when user declines via UI', async () => {
       const mockEmitConsentRequest = vi.spyOn(coreEvents, 'emitConsentRequest');
       vi.spyOn(coreEvents, 'listenerCount').mockReturnValue(1);

packages/core/src/utils/authConsent.ts

@@ -15,7 +15,9 @@ import { isHeadlessMode } from './headless.js';
  * Handles both interactive and non-interactive (headless) modes.
  */
 export async function getConsentForOauth(prompt: string): Promise<boolean> {
-  const finalPrompt = prompt + ' Opening authentication page in your browser. ';
+  const finalPrompt =
+    (prompt ? prompt + ' ' : '') +
+    'Opening authentication page in your browser. ';
 
   if (isHeadlessMode()) {
     return getOauthConsentNonInteractive(finalPrompt);