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

packages/core/src/services/modelConfigService.ts

@@ -11,6 +11,7 @@ import {
   PREVIEW_GEMINI_3_1_MODEL,
   PREVIEW_GEMINI_3_1_FLASH_LITE_MODEL,
   isProModel,
+  getAutoModelDescription,
 } from '../config/models.js';
 
 // The primary key for the ModelConfig is the model string. However, we also
@@ -101,6 +102,7 @@ export interface ResolutionContext {
   hasAccessToPreview?: boolean;
   hasAccessToProModel?: boolean;
   requestedModel?: string;
+  releaseChannel?: string;
 }
 
 /** The requirements defined in the registry. */
@@ -111,6 +113,7 @@ export interface ResolutionCondition {
   hasAccessToPreview?: boolean;
   /** Matches if the current model is in this list. */
   requestedModels?: string[];
+  releaseChannel?: string;
 }
 
 export interface ModelConfigServiceConfig {
@@ -156,6 +159,7 @@ export class ModelConfigService {
     const shouldShowPreviewModels = context.hasAccessToPreview ?? false;
     const useGemini31 = context.useGemini3_1 ?? false;
     const useGemini31FlashLite = context.useGemini3_1FlashLite ?? false;
+    const releaseChannel = context.releaseChannel ?? 'stable';
 
     const mainOptions = Object.entries(definitions)
       .filter(([_, m]) => {
@@ -164,18 +168,21 @@ export class ModelConfigService {
         if (m.tier !== 'auto') return false;
         return true;
       })
-      .map(([id, m]) => ({
-        modelId: id,
-        name: m.displayName ?? getDisplayString(id),
-        description:
-          id === 'auto-gemini-3' && useGemini31
-            ? (m.dialogDescription ?? '').replace(
-                'gemini-3-pro',
-                'gemini-3.1-pro',
-              )
-            : (m.dialogDescription ?? ''),
-        tier: m.tier ?? 'auto',
-      }));
+      .map(([id, m]) => {
+        let description = m.dialogDescription ?? '';
+        if (id === 'auto') {
+          description = getAutoModelDescription(releaseChannel, useGemini31);
+        } else if (id === 'auto-gemini-3' && useGemini31) {
+          description = description.replace('gemini-3-pro', 'gemini-3.1-pro');
+        }
+
+        return {
+          modelId: id,
+          name: m.displayName ?? getDisplayString(id),
+          description,
+          tier: m.tier ?? 'auto',
+        };
+      });
 
     const manualOptions = Object.entries(definitions)
       .filter(([id, m]) => {
@@ -258,6 +265,8 @@ export class ModelConfigService {
             !!context.requestedModel &&
             value.includes(context.requestedModel)
           );
+        case 'releaseChannel':
+          return value === context.releaseChannel;
         default:
           return false;
       }