cron SKILL.md skillA
cron from volcengine/openviking is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add volcengine/openviking/cron@git:20260228.006a06fPins git:20260228.006a06f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- volcengine/openviking
- Path
bot/workspace/skills/cron/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260228.006a06f, committed Feb 28, 2026
- Size
- 1,171 bytes
- Repository stars
- 41,269
- License
- AGPL-3.0
Schedule reminders and recurring tasks.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Cron Use the `cron` tool to schedule reminders or recurring tasks. ## Three Modes 1. **Reminder** - message is sent directly to user 2. **Task** - message is a task description, agent executes and sends result 3. **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) |
Read the whole file at its exact version.
How to install
mdr add volcengine/openviking/cron@sha256:f64094d2752dc53cThe line at the top of this page pins the label git:20260228.006a06f, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_tewd7suzqojzoqxd)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Feb 28, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (1171 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
volcengine/openviking · 41,269 stars · license AGPL-3.0 · pushed 2026-11-01 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_tewd7suzqojzoqxd GET https://markdownregistry.com/api/v1/resolve?ref=volcengine/openviking/cron GET https://markdownregistry.com/api/v1/blob/f64094d2752dc53cf1ff87c0f359a881ca8617b7f095547ebe1013ebf84ce75e
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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