cron-mastery SKILL.md skillA
cron-mastery from pr-e/openclaw-master-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add pr-e/openclaw-master-skills/cron-mastery@git:20260311.3e83ceePins git:20260311.3e83cee in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- pr-e/openclaw-master-skills
- Path
skills/cron-mastery/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260311.3e83cee, committed Mar 11, 2026
- Size
- 6,068 bytes
- Repository stars
- 4
- License
- MIT
Master OpenClaw's timing systems. Use for scheduling reliable reminders, setting up periodic maintenance (janitor jobs), and understanding when to use Cron vs Heartbeat for time-sensitive 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 Mastery
**Rule #1: Heartbeats drift. Cron is precise.**
This skill provides the definitive guide for managing time in OpenClaw 2026.2.15+. It solves the "I missed my reminder" problem by enforcing a strict separation between casual checks (heartbeat) and hard schedules (cron).
## The Core Principle
| System | Behavior | Best For | Risk |
| :--- | :--- | :--- | :--- |
| **Heartbeat** | "I'll check in when I can" (e.g., every 30-60m) | Email checks, casual news summaries, low-priority polling. | **Drift:** A "remind me in 10m" task will fail if the heartbeat is 30m. |
| **Cron** | "I will run at exactly X time" | Reminders ("in 5 mins"), daily reports, system maintenance. | **Clutter:** Creates one-off jobs that need cleanup. |
## 1. Setting Reliable Reminders (2026.2.15+ Standard)
**Rule:** Never use `act:wait` or internal loops for long delays (>1 min). Use `cron:add` with a one-shot `at` schedule.
### Precision & The "Scheduler Tick"
While Cron is precise, execution depends on the **Gateway Heartbeat** (typically every 10-60s). A job set for `:00` seconds will fire on the first "tick" after that time. Expect up to ~30s of variance depending on your gateway config.
…Read the whole file at its exact version.
How to install
mdr add pr-e/openclaw-master-skills/cron-mastery@sha256:f7a7d3dd5f1817d5The line at the top of this page pins the label git:20260311.3e83cee, 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_guz6irlguo4licao)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Mar 11, 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 (6068 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
pr-e/openclaw-master-skills · 4 stars · license MIT · pushed 2026-10-13 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_guz6irlguo4licao GET https://markdownregistry.com/api/v1/resolve?ref=pr-e/openclaw-master-skills/cron-mastery GET https://markdownregistry.com/api/v1/blob/f7a7d3dd5f1817d566c804072eac93c6a699f1db5417a07c76ca5af1287e5743
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.