GBrain is a memory and retrieval layer for AI agents that searches, connects, and synthesizes information from stored sources. It is used to give coding agents and autonomous agents access to knowledge beyond their current code, including shared company information with access controls. The catalogue add-ons help agents operate GBrain and connect it to agent workflows.
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 garrytan/gbrain --skill cron-schedulergit clone --depth 1 https://github.com/garrytan/gbrainWrote 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/garrytan/gbrain/cron-scheduler)<a href="https://agentmods.dev/skills/garrytan/gbrain/cron-scheduler"><img src="https://agentmods.dev/badge/skills/garrytan/gbrain/cron-scheduler/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/garrytan/gbrain/cron-scheduler"><img src="https://agentmods.dev/badge/skills/garrytan/gbrain/cron-scheduler.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
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 →
- high YARA Match · line 69 YARA rule matched a known malware signature (reverse shell, backdoor, ransomware, C2 framework, or info stealer).Fix: Remove the malware payload or compromised file entirely. Investigate how it entered the skill and audit all other artifacts for additional indicators of compromise.
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 | $0.00031 | $0.01050 |
| Opus 5 | $0.00015 | $0.00525 |
| Sonnet 5 | $0.00006 | $0.00210 |
| Haiku 4.5 | $0.00003 | $0.00105 |
Grade A, and why
cron-scheduler 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 9d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- cron-scheduler — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 94 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cron Scheduler
Convention: See
skills/conventions/test-before-bulk.md— test every cron job on 3-5 items first.
Contract
This skill guarantees:
- Schedule staggering: max 1 job per 5-minute slot, no collisions
- Quiet hours gating: timezone-aware, with user-awake override
- Thin job prompts: jobs say "Read skills/X/SKILL.md and run it" (no inline 3000-word prompts)
- Idempotency: jobs can run twice without duplicate side effects
- Results saved as reports:
reports/{job-name}/{YYYY-MM-DD-HHMM}.md
Phases
- Define job. Name, schedule (cron expression), skill to run, timeout.
- Validate schedule. Check no collision with existing jobs (5-minute offset rule).
- Slots: :05, :10, :15, :20, :25, :30, :35, :40, :45, :50
- If collision detected, suggest the next available slot
- Check quiet hours. Default: 11 PM - 8 AM local time.
- Override: user-awake flag (if user is active, quiet hours suspended)
- During quiet hours: save output to held queue
- Morning contact releases the backlog
- Register with host scheduler. OpenClaw cron, Railway cron, crontab, or process manager. Each registered entry should execute via Minions, not
agentTurn. Seeskills/conventions/cron-via-minions.mdfor the rewrite pattern (PGLite uses--follow, Postgres uses fire-and-forget +--idempotency-keyon the cycle slot). GBrain's v0.11.0 migration auto-rewrites entries for built-in handlers; host-specific handlers need a code-level registration perdocs/guides/plugin-handlers.md. - Write thin prompt. Job prompt is one line: "Read skills/{name}/SKILL.md and run it."
Idempotency Requirement
Every cron job MUST be idempotent:
- Running the same job twice produces the same result (no duplicate pages, no duplicate timeline entries)
- Use checkpoint state files to track progress and resume interrupted runs
- Check for existing output before creating new output
Output Format
Job configuration saved. Report: "Job '{name}' scheduled at {cron expression}. Next run: {time}."
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.
- 9d ago First seen · 94 lines · 31 tokens per session scan A e3f9745c4f8e
cron-scheduler is a skill published in the GitHub repository garrytan/gbrain (29,702 stars, last pushed today), licensed MIT. It adds 31 tokens to every session and 1,050 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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