Let users know when falling back to flash, and update the error messa… (#12640)

packages/core/src/fallback/handler.test.ts

@@ -127,22 +127,6 @@ describe('handleFallback', () => {
     });
   });
 
-  describe('when handler returns "auth"', () => {
-    it('should NOT activate fallback mode and return false', async () => {
-      mockHandler.mockResolvedValue('auth');
-
-      const result = await handleFallback(
-        mockConfig,
-        MOCK_PRO_MODEL,
-        AUTH_OAUTH,
-      );
-
-      expect(result).toBe(false);
-      expect(mockConfig.setFallbackMode).not.toHaveBeenCalled();
-      expect(logFlashFallback).not.toHaveBeenCalled();
-    });
-  });
-
   describe('when handler returns an unexpected value', () => {
     it('should log an error and return null', async () => {
       mockHandler.mockResolvedValue(null);

packages/core/src/fallback/handler.ts

@@ -46,7 +46,7 @@ export async function handleFallback(
         activateFallbackMode(config, authType);
         return false;
 
-      case 'auth':
+      case 'retry_later':
         return false;
 
       default:

packages/core/src/fallback/types.ts

@@ -10,7 +10,7 @@
 export type FallbackIntent =
   | 'retry' // Immediately retry the current request with the fallback model.
   | 'stop' // Switch to fallback for future requests, but stop the current request.
-  | 'auth'; // Stop the current request; user intends to change authentication.
+  | 'retry_later'; // Stop the current request and do not fallback. Intend to try again later with the same model.
 
 /**
  * The interface for the handler provided by the UI layer (e.g., the CLI)