feat(cli): merge Auto modes into a single Auto mode (#26714)

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

@@ -2058,7 +2058,7 @@ describe('loadCliConfig model selection', () => {
       argv,
     );
 
-    expect(config.getModel()).toBe('auto-gemini-3');
+    expect(config.getModel()).toBe('auto');
   });
 
   it('always prefers model from argv', async () => {
@@ -2102,7 +2102,7 @@ describe('loadCliConfig model selection', () => {
       argv,
     );
 
-    expect(config.getModel()).toBe('auto-gemini-3');
+    expect(config.getModel()).toBe('auto');
   });
 });
 

packages/cli/src/config/config.ts

@@ -30,7 +30,6 @@ import {
   loadServerHierarchicalMemory,
   ASK_USER_TOOL_NAME,
   getVersion,
-  PREVIEW_GEMINI_MODEL_AUTO,
   type HierarchicalMemory,
   coreEvents,
   GEMINI_MODEL_ALIAS_AUTO,
@@ -866,7 +865,7 @@ export async function loadCliConfig(
     interactive,
   );
 
-  const defaultModel = PREVIEW_GEMINI_MODEL_AUTO;
+  const defaultModel = GEMINI_MODEL_ALIAS_AUTO;
   const rawModel =
     argv.model || process.env['GEMINI_MODEL'] || settings.model?.name;
 

packages/cli/src/config/settingsSchema.ts

@@ -3471,7 +3471,11 @@ export const SETTINGS_SCHEMA_DEFINITIONS: Record<
       family: { type: 'string' },
       isPreview: { type: 'boolean' },
       isVisible: { type: 'boolean' },
-      dialogDescription: { type: 'string' },
+      dialogDescription: {
+        type: 'string',
+        description:
+          "A description of the model to display in the model selection dialog. For the 'auto' alias, this value is dynamically generated and any value provided here will be ignored.",
+      },
       features: {
         type: 'object',
         properties: {