OpenOPC is a system for building and operating an AI-run company, where specialized AI workers are recruited, assigned tasks, and organized into roles. It is for people who want automated task delegation, collaboration, and organizational learning through AI agents.
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 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/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/hkuds/openopc/cron"><img src="https://agentmods.dev/badge/skills/hkuds/openopc/cron.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 4 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Rogue Agent · line 13 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Rogue Agent · line 19 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Rogue Agent · line 53 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
- medium Rogue Agent · line 48 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
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 | $0.00018 | $0.00403 |
| Opus 5.5 | $0.00007 | $0.00161 |
| Sonnet 5.5 | $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 1mo 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.
- 1mo ago First seen · 61 lines · 18 tokens per session scan A 0f8adf93b0de
cron is a skill published in the GitHub repository HKUDS/OpenOPC (1,852 stars, last pushed 8d ago), licensed MIT. It adds 18 tokens to every session and 403 once invoked, about $0.0001 per session on Opus 5.5. 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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