feat(cron): add distinct Cron message type and exit summary

- Introduce SendMessageType.Cron to differentiate cron-triggered prompts
  from user queries
- Skip UserPromptSubmit hook for cron messages
- Add getExitSummary() to display active loops when session ends
- Add tests for exit summary functionality

This improves cron loop handling by treating scheduled prompts
differently from user-initiated queries and provides better UX
when sessions end with active loops running.

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

packages/core/src/core/client.ts

@@ -92,6 +92,8 @@ export enum SendMessageType {
   ToolResult = 'toolResult',
   Retry = 'retry',
   Hook = 'hook',
+  /** Cron-fired prompt. Behaves like UserQuery but skips UserPromptSubmit hook. */
+  Cron = 'cron',
 }
 
 export interface SendMessageOptions {
@@ -465,7 +467,12 @@ export class GeminiClient {
     // Fire UserPromptSubmit hook through MessageBus (only if hooks are enabled)
     const hooksEnabled = this.config.getEnableHooks();
     const messageBus = this.config.getMessageBus();
-    if (messageType !== SendMessageType.Retry && hooksEnabled && messageBus) {
+    if (
+      messageType !== SendMessageType.Retry &&
+      messageType !== SendMessageType.Cron &&
+      hooksEnabled &&
+      messageBus
+    ) {
       const promptText = partToString(request);
       const response = await messageBus.request<
         HookExecutionRequest,
@@ -507,7 +514,10 @@ export class GeminiClient {
       }
     }
 
-    if (messageType === SendMessageType.UserQuery) {
+    if (
+      messageType === SendMessageType.UserQuery ||
+      messageType === SendMessageType.Cron
+    ) {
       this.loopDetector.reset(prompt_id);
       this.lastPromptId = prompt_id;
 
@@ -605,7 +615,10 @@ export class GeminiClient {
 
     // append system reminders to the request
     let requestToSent = await flatMapTextParts(request, async (text) => [text]);
-    if (messageType === SendMessageType.UserQuery) {
+    if (
+      messageType === SendMessageType.UserQuery ||
+      messageType === SendMessageType.Cron
+    ) {
       const systemReminders = [];
 
       // add subagent system reminder if there are subagents

packages/core/src/services/cronScheduler.test.ts

@@ -203,6 +203,44 @@ describe('CronScheduler', () => {
     });
   });
 
+  describe('getExitSummary', () => {
+    it('returns null when no jobs', () => {
+      expect(scheduler.getExitSummary()).toBeNull();
+    });
+
+    it('returns summary with single job', () => {
+      scheduler.create('*/5 * * * *', 'check the build', true);
+      const summary = scheduler.getExitSummary()!;
+      expect(summary).toContain('1 active loop cancelled:');
+      expect(summary).toContain('Every 5 minutes');
+      expect(summary).toContain('check the build');
+    });
+
+    it('returns summary with multiple jobs', () => {
+      scheduler.create('*/5 * * * *', 'check the build', true);
+      scheduler.create('*/30 * * * *', 'check PR reviews', true);
+      const summary = scheduler.getExitSummary()!;
+      expect(summary).toContain('2 active loops cancelled:');
+      expect(summary).toContain('check the build');
+      expect(summary).toContain('check PR reviews');
+    });
+
+    it('truncates long prompts', () => {
+      const longPrompt = 'a'.repeat(100);
+      scheduler.create('*/1 * * * *', longPrompt, true);
+      const summary = scheduler.getExitSummary()!;
+      expect(summary).toContain('...');
+      // Should not contain the full 100-char prompt
+      expect(summary).not.toContain(longPrompt);
+    });
+
+    it('returns null after all jobs are deleted', () => {
+      const job = scheduler.create('*/1 * * * *', 'temp', true);
+      scheduler.delete(job.id);
+      expect(scheduler.getExitSummary()).toBeNull();
+    });
+  });
+
   describe('destroy', () => {
     it('stops and clears all jobs', () => {
       scheduler.create('*/1 * * * *', 'a', true);

packages/core/src/services/cronScheduler.ts

@@ -4,6 +4,7 @@
  */
 
 import { matches, nextFireTime } from '../utils/cronParser.js';
+import { humanReadableCron } from '../utils/cronDisplay.js';
 
 const MAX_JOBS = 50;
 const THREE_DAYS_MS = 3 * 24 * 60 * 60 * 1000;
@@ -224,6 +225,27 @@ export class CronScheduler {
     }
   }
 
+  /**
+   * Returns a human-readable summary of active jobs for display on session
+   * exit. Returns null if there are no active jobs.
+   */
+  getExitSummary(): string | null {
+    if (this.jobs.size === 0) return null;
+
+    const count = this.jobs.size;
+    const lines = [
+      `Session ending. ${count} active loop${count === 1 ? '' : 's'} cancelled:`,
+    ];
+    for (const job of this.jobs.values()) {
+      const schedule = humanReadableCron(job.cronExpr);
+      // Truncate long prompts
+      const prompt =
+        job.prompt.length > 60 ? job.prompt.slice(0, 57) + '...' : job.prompt;
+      lines.push(`  - [${job.id}] ${schedule}: ${prompt}`);
+    }
+    return lines.join('\n');
+  }
+
   /**
    * Clears all jobs and stops the scheduler.
    */