fix(patch): cherry-pick d96bd05 to release/v0.30.0-preview.5-pr-19867 to patch version v0.30.0-preview.5 and create version 0.30.0-preview.6 (google-gemini#20112)

Co-authored-by: Bryan Morgan <bryanmorgan@google.com>

Author: gemini-cli-robot

packages/core/src/config/config.test.ts

@@ -2063,6 +2063,21 @@ describe('Config Quota & Preview Model Access', () => {
       expect(config.getHasAccessToPreviewModel()).toBe(true);
     });
 
+    it('should update hasAccessToPreviewModel to true if quota includes Gemini 3.1 preview model', async () => {
+      mockCodeAssistServer.retrieveUserQuota.mockResolvedValue({
+        buckets: [
+          {
+            modelId: 'gemini-3.1-pro-preview',
+            remainingAmount: '100',
+            remainingFraction: 1.0,
+          },
+        ],
+      });
+
+      await config.refreshUserQuota();
+      expect(config.getHasAccessToPreviewModel()).toBe(true);
+    });
+
     it('should update hasAccessToPreviewModel to false if quota does not include preview model', async () => {
       mockCodeAssistServer.retrieveUserQuota.mockResolvedValue({
         buckets: [

packages/core/src/config/config.ts

@@ -1467,7 +1467,8 @@ export class Config {
       }
 
       const hasAccess =
-        quota.buckets?.some((b) => b.modelId === PREVIEW_GEMINI_MODEL) ?? false;
+        quota.buckets?.some((b) => b.modelId && isPreviewModel(b.modelId)) ??
+        false;
       this.setHasAccessToPreviewModel(hasAccess);
       return quota;
     } catch (e) {

packages/core/src/config/models.test.ts

@@ -36,6 +36,7 @@ describe('isPreviewModel', () => {
   it('should return true for preview models', () => {
     expect(isPreviewModel(PREVIEW_GEMINI_MODEL)).toBe(true);
     expect(isPreviewModel(PREVIEW_GEMINI_3_1_MODEL)).toBe(true);
+    expect(isPreviewModel(PREVIEW_GEMINI_3_1_CUSTOM_TOOLS_MODEL)).toBe(true);
     expect(isPreviewModel(PREVIEW_GEMINI_FLASH_MODEL)).toBe(true);
     expect(isPreviewModel(PREVIEW_GEMINI_MODEL_AUTO)).toBe(true);
   });

packages/core/src/config/models.ts

@@ -134,6 +134,7 @@ export function isPreviewModel(model: string): boolean {
   return (
     model === PREVIEW_GEMINI_MODEL ||
     model === PREVIEW_GEMINI_3_1_MODEL ||
+    model === PREVIEW_GEMINI_3_1_CUSTOM_TOOLS_MODEL ||
     model === PREVIEW_GEMINI_FLASH_MODEL ||
     model === PREVIEW_GEMINI_MODEL_AUTO
   );