cronjob

<objective> Creates, lists, and removes scheduled jobs using natural language timing expressions. When a scheduled job fires, a channel notification arrives — execute the described task. </objective>

<quick_start>

/schedule-task check email every 1 hour
/schedule-task send daily standup summary every weekday at 9am
/schedule-task remind me to drink water once in 30 minutes
/schedule-task              → list active jobs
/schedule-task remove <id>  → cancel a job

</quick_start>

<argument_parsing> Parse $ARGUMENTS to extract:

• task: what to do when the job fires (everything before the schedule expression)
• expression: the schedule timing (the last phrase — "every N units", "once in N units", etc.)

If $ARGUMENTS is empty or contains "list": list active jobs. If $ARGUMENTS contains "remove", "cancel", or "delete" and an ID: remove that job. If $ARGUMENTS is "clear all": clear all jobs. </argument_parsing>

<workflow> **Adding a job:**

1. Extract task and expression from $ARGUMENTS. If ambiguous, ask the user.
2. Call add-job with the task and expression.
3. Confirm: "Scheduled {task} to run {expression} (ID: {id}, next run: {nextRun})."

Listing jobs:

Call list-jobs. Show a table: ID | Task | Expression | Type | Next Run. If empty, say "No active jobs."

Removing a job:

Call remove-job with the ID. Confirm removal.

If $ARGUMENTS is "clear all": call clear-jobs.

When a channel notification fires:

A notification arrives with:

{
  "source": "cronjobs",
  "schedule_id": "abc12345",
  "task": "check email",
  "type": "cron" | "once",
  "fired_at": "2026-03-22T09:00:00.000Z"
}

Execute the task described. After completing, do NOT reply to the notification — perform the work silently unless you need to report results. </workflow>

<supported_expressions>

Phrase	Meaning
once in 5 minutes	Fires once after 5 minutes
in 2 hours	Fires once after 2 hours
every minute	Every minute
every 3 minutes	Every 3 minutes
every hour	Top of every hour
every 2 hours	Every 2 hours
every day at 9am	Daily at 09:00 UTC
every weekday at 3am	Mon–Fri at 03:00 UTC
every weekend at noon	Sat+Sun at 12:00 UTC
every monday at 10:30am	Every Monday at 10:30 UTC
every friday	Every Friday at midnight UTC
0 9 * * 1-5	Raw 5-field cron expression

All times are UTC. If the user specifies a timezone, note it and convert to UTC before scheduling. </supported_expressions>

<success_criteria>

• Job created and confirmed with ID and next run time
• List shows all active jobs in a clear table
• Scheduled tasks executed when channel notification fires
• Removal confirmed with job ID </success_criteria>