Cron

A straightforward scheduling tool that handles both static reminders and dynamic tasks where Claude actually executes something each time the cron fires. The three-mode setup is smart: fixed reminders for things like break notifications, recurring tasks where the agent checks GitHub stars or pulls fresh data, and one-time scheduled events that clean themselves up. It supports both simple interval timers (every_seconds) and proper cron expressions for "weekdays at 5pm" scenarios. The dynamic task mode is the interesting bit here, since most cron tools just send you a message, but this one lets Claude run a task description and report back with current results each time.

skills.sh installs: 228
GitHub stars: 41.9K
last updated: Aug 21, 2026

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Install

$ npx -y skills add volcengine/openviking --skill cron --agent claude-code

Installs into .claude/skills of the current project.

Files

Cron

Use the cron tool to schedule reminders or recurring tasks.

Three Modes

Reminder - message is sent directly to user
Task - message is a task description, agent executes and sends result
One-time - runs once at a specific time, then auto-deletes

Examples

Fixed reminder:

cron(action="add", message="Time to take a break!", every_seconds=1200)

Dynamic task (agent executes each time):

cron(action="add", message="Check HKUDS/vikingbot GitHub stars and report", every_seconds=600)

One-time scheduled task (compute ISO datetime from current time):

cron(action="add", message="Remind me about the meeting", at="<ISO datetime>")

List/remove:

cron(action="list")
cron(action="remove", job_id="abc123")

Time Expressions

User says	Parameters
every 20 minutes	every_seconds: 1200
every hour	every_seconds: 3600
every day at 8am	cron_expr: "0 8 * * *"
weekdays at 5pm	cron_expr: "0 17 * * 1-5"
at a specific time	at: ISO datetime string (compute from current time)