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 agentmods add skills/hkuds/openopc/cronnpx skills add HKUDS/OpenOPC --skill crongit clone --depth 1 https://github.com/HKUDS/OpenOPCWrote 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/hkuds/openopc/cron)<a href="https://agentmods.dev/skills/hkuds/openopc/cron"><img src="https://agentmods.dev/badge/skills/hkuds/openopc/cron.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00018 | $0.00403 |
| Opus 5 | $0.00009 | $0.00201 |
| Sonnet 5 | $0.00004 | $0.00081 |
| Haiku 4.5 | $0.00002 | $0.00040 |
Grade A, and why
cron 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 4d 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.
What it actually says
Cron
Schedule tasks using the system crontab via shell_exec.
List current cron jobs
crontab -l
Add a recurring job
(crontab -l 2>/dev/null; echo "*/20 * * * * echo 'Time to take a break!' >> /tmp/opc-reminders.log") | crontab -
Common schedules
| Schedule | Cron expression |
|---|---|
| Every 20 minutes | */20 * * * * |
| Every hour | 0 * * * * |
| Every day at 8am | 0 8 * * * |
| Weekdays at 5pm | 0 17 * * 1-5 |
| Every Monday at 9am | 0 9 * * 1 |
One-time scheduled task
Use at for one-time jobs:
echo "echo 'Meeting reminder' >> /tmp/opc-reminders.log" | at 14:30
Or schedule with a specific date:
echo "echo 'Deadline reminder' >> /tmp/opc-reminders.log" | at 10:00 2026-03-20
Remove a job
Edit the crontab directly:
crontab -e
Or filter out a specific job:
crontab -l | grep -v 'pattern-to-remove' | crontab -
Notes
- Use full paths in cron commands (cron has a minimal
$PATH). - Redirect output to a log file or
/dev/nullto avoid mail noise. - Check
atavailability:which at(install withapt install atif missing).
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.
- 4d ago First seen · 61 lines · 18 tokens per session scan A 0f8adf93b0de
cron is a skill published in the GitHub repository HKUDS/OpenOPC (1,610 stars, last pushed today), licensed MIT. It adds 18 tokens to every session and 403 once invoked, about $0.0001 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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