Implement cron job management system for scheduled tasks (similar to OpenAI's Pulse but the AI can also schedule jobs)

- Introduced a new cron job system allowing users to schedule automated tasks via the CLI, supporting one-time reminders and recurring jobs.
- Added commands for managing cron jobs: `/cron` to list jobs, `/cron add` to create new jobs, and `/cron remove` to delete jobs.
- Implemented job storage in `~/.hermes/cron/jobs.json` with output saved to `~/.hermes/cron/output/{job_id}/{timestamp}.md`.
- Enhanced the CLI and README documentation to include detailed usage instructions and examples for cron job management.
- Integrated cron job tools into the hermes-cli toolset, ensuring they are only available in interactive CLI mode.
- Added support for cron expression parsing with the `croniter` package, enabling flexible scheduling options.

cron/scheduler.py

@@ -0,0 +1,188 @@
+"""
+Cron job scheduler - executes due jobs.
+
+This module provides:
+- tick(): Run all due jobs once (for system cron integration)
+- run_daemon(): Run continuously, checking every 60 seconds
+"""
+
+import os
+import sys
+import time
+import traceback
+from datetime import datetime
+from pathlib import Path
+from typing import Optional
+
+# Add parent directory to path for imports
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+from cron.jobs import get_due_jobs, mark_job_run, save_job_output
+
+
+def run_job(job: dict) -> tuple[bool, str, Optional[str]]:
+    """
+    Execute a single cron job.
+    
+    Returns:
+        Tuple of (success, output, error_message)
+    """
+    from run_agent import AIAgent
+    
+    job_id = job["id"]
+    job_name = job["name"]
+    prompt = job["prompt"]
+    
+    print(f"[cron] Running job '{job_name}' (ID: {job_id})")
+    print(f"[cron] Prompt: {prompt[:100]}{'...' if len(prompt) > 100 else ''}")
+    
+    try:
+        # Create agent with default settings
+        # Jobs run in isolated sessions (no prior context)
+        agent = AIAgent(
+            model=os.getenv("HERMES_MODEL", "anthropic/claude-sonnet-4"),
+            quiet_mode=True,
+            session_id=f"cron_{job_id}_{datetime.now().strftime('%Y%m%d_%H%M%S')}"
+        )
+        
+        # Run the conversation
+        result = agent.run_conversation(prompt)
+        
+        # Extract final response
+        final_response = result.get("final_response", "")
+        if not final_response:
+            final_response = "(No response generated)"
+        
+        # Build output document
+        output = f"""# Cron Job: {job_name}
+
+**Job ID:** {job_id}
+**Run Time:** {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}
+**Schedule:** {job.get('schedule_display', 'N/A')}
+
+## Prompt
+
+{prompt}
+
+## Response
+
+{final_response}
+"""
+        
+        print(f"[cron] Job '{job_name}' completed successfully")
+        return True, output, None
+        
+    except Exception as e:
+        error_msg = f"{type(e).__name__}: {str(e)}"
+        print(f"[cron] Job '{job_name}' failed: {error_msg}")
+        
+        # Build error output
+        output = f"""# Cron Job: {job_name} (FAILED)
+
+**Job ID:** {job_id}
+**Run Time:** {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}
+**Schedule:** {job.get('schedule_display', 'N/A')}
+
+## Prompt
+
+{prompt}
+
+## Error
+
+```
+{error_msg}
+
+{traceback.format_exc()}
+```
+"""
+        return False, output, error_msg
+
+
+def tick(verbose: bool = True) -> int:
+    """
+    Check and run all due jobs.
+    
+    This is designed to be called by system cron every minute:
+        */1 * * * * cd ~/hermes-agent && python -c "from cron import tick; tick()"
+    
+    Args:
+        verbose: Whether to print status messages
+    
+    Returns:
+        Number of jobs executed
+    """
+    due_jobs = get_due_jobs()
+    
+    if verbose and not due_jobs:
+        print(f"[cron] {datetime.now().strftime('%H:%M:%S')} - No jobs due")
+        return 0
+    
+    if verbose:
+        print(f"[cron] {datetime.now().strftime('%H:%M:%S')} - {len(due_jobs)} job(s) due")
+    
+    executed = 0
+    for job in due_jobs:
+        try:
+            success, output, error = run_job(job)
+            
+            # Save output to file
+            output_file = save_job_output(job["id"], output)
+            if verbose:
+                print(f"[cron] Output saved to: {output_file}")
+            
+            # Mark job as run (handles repeat counting, next_run computation)
+            mark_job_run(job["id"], success, error)
+            executed += 1
+            
+        except Exception as e:
+            print(f"[cron] Error processing job {job['id']}: {e}")
+            mark_job_run(job["id"], False, str(e))
+    
+    return executed
+
+
+def run_daemon(check_interval: int = 60, verbose: bool = True):
+    """
+    Run the cron daemon continuously.
+    
+    Checks for due jobs every `check_interval` seconds.
+    
+    Args:
+        check_interval: Seconds between checks (default: 60)
+        verbose: Whether to print status messages
+    """
+    print(f"[cron] Starting daemon (checking every {check_interval}s)")
+    print(f"[cron] Press Ctrl+C to stop")
+    print()
+    
+    try:
+        while True:
+            try:
+                tick(verbose=verbose)
+            except Exception as e:
+                print(f"[cron] Tick error: {e}")
+            
+            time.sleep(check_interval)
+            
+    except KeyboardInterrupt:
+        print("\n[cron] Daemon stopped")
+
+
+if __name__ == "__main__":
+    # Allow running directly: python cron/scheduler.py [daemon|tick]
+    import argparse
+    
+    parser = argparse.ArgumentParser(description="Hermes Cron Scheduler")
+    parser.add_argument("mode", choices=["daemon", "tick"], default="tick", nargs="?",
+                        help="Mode: 'tick' to run once, 'daemon' to run continuously")
+    parser.add_argument("--interval", type=int, default=60,
+                        help="Check interval in seconds for daemon mode")
+    parser.add_argument("--quiet", "-q", action="store_true",
+                        help="Suppress status messages")
+    
+    args = parser.parse_args()
+    
+    if args.mode == "daemon":
+        run_daemon(check_interval=args.interval, verbose=not args.quiet)
+    else:
+        tick(verbose=not args.quiet)