feat(cron): make cron tools opt-in via experimental settings

Change cron/loop tools from opt-out to opt-in. Cron tools are now
disabled by default and can be enabled via:
- settings.json: { "experimental": { "cron": true } }
- Environment variable: QWEN_CODE_ENABLE_CRON=1

This ensures experimental features are explicitly enabled by users
who want to try them.

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

packages/cli/src/config/config.ts

@@ -1089,6 +1089,7 @@ export async function loadCliConfig(
     maxSessionTurns:
       argv.maxSessionTurns ?? settings.model?.maxSessionTurns ?? -1,
     experimentalZedIntegration: argv.acp || argv.experimentalAcp || false,
+    cronEnabled: settings.experimental?.cron ?? false,
     listExtensions: argv.listExtensions || false,
     overrideExtensions: overrideExtensions || argv.extensions,
     noBrowser: !!process.env['NO_BROWSER'],

packages/cli/src/config/settingsSchema.ts

@@ -1594,9 +1594,20 @@ const SETTINGS_SCHEMA = {
     category: 'Experimental',
     requiresRestart: true,
     default: {},
-    description: 'Setting to enable experimental features',
+    description: 'Settings to enable experimental features.',
     showInDialog: false,
-    properties: {},
+    properties: {
+      cron: {
+        type: 'boolean',
+        label: 'Enable Cron/Loop Tools',
+        category: 'Experimental',
+        requiresRestart: true,
+        default: false,
+        description:
+          'Enable in-session cron/loop tools (experimental). When enabled, the model can create recurring prompts using cron_create, cron_list, and cron_delete tools. Can also be enabled via QWEN_CODE_ENABLE_CRON=1 environment variable.',
+        showInDialog: true,
+      },
+    },
   },
 } as const satisfies SettingsSchema;
 

packages/cli/src/nonInteractiveCli.test.ts

@@ -144,7 +144,7 @@ describe('runNonInteractive', () => {
       }),
       getExperimentalZedIntegration: vi.fn().mockReturnValue(false),
       isInteractive: vi.fn().mockReturnValue(false),
-      isCronDisabled: vi.fn().mockReturnValue(true),
+      isCronEnabled: vi.fn().mockReturnValue(false),
       getCronScheduler: vi.fn().mockReturnValue(null),
     } as unknown as Config;
 

packages/cli/src/nonInteractiveCli.ts

@@ -372,7 +372,7 @@ export async function runNonInteractive(
           currentMessages = [{ role: 'user', parts: toolResponseParts }];
         } else {
           // No more tool calls — check if cron jobs are keeping us alive
-          const scheduler = config.isCronDisabled()
+          const scheduler = !config.isCronEnabled()
             ? null
             : config.getCronScheduler();
           if (scheduler && scheduler.size > 0) {

packages/cli/src/ui/hooks/useGeminiStream.test.tsx

@@ -204,7 +204,7 @@ describe('useGeminiStream', () => {
         .mockReturnValue(contentGeneratorConfig),
       getMaxSessionTurns: vi.fn(() => 50),
       getArenaAgentClient: vi.fn(() => null),
-      isCronDisabled: vi.fn(() => true),
+      isCronEnabled: vi.fn(() => false),
       getCronScheduler: vi.fn(() => null),
     } as unknown as Config;
     mockOnDebugMessage = vi.fn();

packages/cli/src/ui/hooks/useGeminiStream.ts

@@ -1643,7 +1643,7 @@ export const useGeminiStream = (
 
   // Start the scheduler on mount, stop on unmount
   useEffect(() => {
-    if (config.isCronDisabled()) return;
+    if (!config.isCronEnabled()) return;
     const scheduler = config.getCronScheduler();
     scheduler.start((job: { prompt: string }) => {
       cronQueueRef.current.push(job.prompt);