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 render-examples/nanobot-render --skill crongit clone --depth 1 https://github.com/render-examples/nanobot-renderWrote 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/render-examples/nanobot-render/cron)<a href="https://agentmods.dev/skills/render-examples/nanobot-render/cron"><img src="https://agentmods.dev/badge/skills/render-examples/nanobot-render/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/render-examples/nanobot-render/cron"><img src="https://agentmods.dev/badge/skills/render-examples/nanobot-render/cron.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00008 | $0.00468 |
| Opus 5.5 | $0.00003 | $0.00187 |
| Sonnet 5.5 | $0.00002 | $0.00094 |
| Haiku 4.5 | $0.00001 | $0.00047 |
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.
This is a copy
100% identical to cron — 14 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Cron
Use the cron tool to schedule reminders or recurring tasks that should report back to the originating chat/session when they run.
Do not use cron for periodic background checks that should stay quiet when there is nothing useful to report. For those, update HEARTBEAT.md; the protected heartbeat job runs those checks and only delivers results that pass the notification gate.
Three Modes
- Reminder - message is sent directly to user
- Task - message is a task description, agent executes and sends result
- One-time - runs once at a specific time, then auto-deletes
Examples
Fixed reminder:
cron(action="add", message="Time to take a break!", every_seconds=1200)
Dynamic task (agent executes each time):
cron(action="add", message="Check HKUDS/nanobot GitHub stars and report", every_seconds=600)
One-time scheduled task (compute ISO datetime from current time):
cron(action="add", message="Remind me about the meeting", at="<ISO datetime>")
Timezone-aware cron:
cron(action="add", message="Morning standup", cron_expr="0 9 * * 1-5", tz="America/Vancouver")
List/remove:
cron(action="list")
cron(action="remove", job_id="abc123")
Time Expressions
| User says | Parameters |
|---|---|
| every 20 minutes | every_seconds: 1200 |
| every hour | every_seconds: 3600 |
| every day at 8am | cron_expr: "0 8 * * *" |
| weekdays at 5pm | cron_expr: "0 17 * * 1-5" |
| 9am Vancouver time daily | cron_expr: "0 9 * * *", tz: "America/Vancouver" |
| at a specific time | at: ISO datetime string (compute from current time) |
Timezone
Use tz with cron_expr to schedule in a specific IANA timezone. Without tz, the server's local timezone is used.
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 · 60 lines · 8 tokens per session scan A 5f050ee98a94
cron is a skill published in the GitHub repository render-examples/nanobot-render (5 stars, last pushed 3mo ago), licensed MIT. It adds 8 tokens to every session and 468 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to cron, differing in 14 lines, and is treated as a copy.
Other skills, from other repositories
windows-shell
Manage long-running background jobs and interactive workflows on Windows using PowerShell Jobs (Start-Job, Receive-Job) — the Windows equivalent of tmux sessions.
apple-reminders
Manage Apple Reminders via remindctl CLI: list, add, edit, complete, delete. Supports lists, date filters, and JSON output. Syncs to iOS devices.
bear-notes
Create, search, and manage Bear notes via the grizzly CLI. Supports tags, x-callback-url, and JSON output.
obsidian
Work with Obsidian vaults: create, search, move, delete notes. Plain Markdown files with wikilink-aware operations via obsidian-cli.
things
Manage Things 3 on macOS: add/update todos and projects via URL scheme, read inbox/today/upcoming, search tasks. Syncs to iOS.
schedule_manage
Tool: schedulemanage. All ops use action field.