Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add xyva-yuangui/XyvaClaw --skill cron-masterygit clone --depth 1 https://github.com/xyva-yuangui/XyvaClawWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/xyva-yuangui/xyvaclaw/cron-mastery)<a href="https://agentmods.dev/skills/xyva-yuangui/xyvaclaw/cron-mastery"><img src="https://agentmods.dev/badge/skills/xyva-yuangui/xyvaclaw/cron-mastery/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/xyva-yuangui/xyvaclaw/cron-mastery"><img src="https://agentmods.dev/badge/skills/xyva-yuangui/xyvaclaw/cron-mastery.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00041 | $0.01706 |
| Opus 5 | $0.00020 | $0.00853 |
| Sonnet 5 | $0.00008 | $0.00341 |
| Haiku 4.5 | $0.00004 | $0.00171 |
Grade A, and why
cron-mastery scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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.
Modern One-Shot Reminder Pattern
Use this payload structure for "remind me in X minutes" tasks.
Key Features (v2026.2.15+):
- Payload Choice: Use AgentTurn with Strict Instructions for push notifications (reminders that ping your phone). Use systemEvent only for silent logs or background state updates.
- Reliability:
nextRunAtMscorruption and "Add-then-Update" deadlocks are resolved. - Auto-Cleanup: One-shot jobs auto-delete after success (
deleteAfterRun: true).
CRITICAL: Push Notifications vs. Silent Logs
- systemEvent (Silent): Injects text into the chat history. Great for background logs, but WILL NOT ping the user's phone on Telegram/WhatsApp.
- AgentTurn (Proactive): Wakes an agent to deliver the message. REQUIRED for push notifications. Use the "Strict" prompt to avoid AI chatter.
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 12d ago First seen · 122 lines · 41 tokens per session scan A b1ef0ff13f7e
cron-mastery is a skill published in the GitHub repository xyva-yuangui/XyvaClaw (21 stars, last pushed 1mo ago), licensed MIT. It adds 41 tokens to every session and 1,706 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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