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/modimihir07/agentic-os/heartbeatnpx skills add modimihir07/agentic-os --skill heartbeatgit clone --depth 1 https://github.com/modimihir07/agentic-osWrote 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/modimihir07/agentic-os/heartbeat)<a href="https://agentmods.dev/skills/modimihir07/agentic-os/heartbeat"><img src="https://agentmods.dev/badge/skills/modimihir07/agentic-os/heartbeat.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 5.1 | $0.00008 | $0.00212 |
| Opus 5 | $0.00004 | $0.00106 |
| Sonnet 5 | $0.00002 | $0.00042 |
| Haiku 4.5 | $0.00001 | $0.00021 |
Grade A, and why
heartbeat 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 6d 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
Heartbeat — System Health Monitor
Description
Checks system health at regular intervals: agent status, disk usage, memory pressure, and recent audit errors. Flags anomalies and triggers alerts if thresholds are breached.
When to Use
- Every 5 minutes as a scheduled cron job
- On-demand to check system health
- Before and after running other skills
Process
- Check all 3 agents (opencode, hermes, agy) are online
- Check disk usage (< 90%)
- Check memory pressure (< 80%)
- Scan recent audit log for errors
- Update brain/recent-decisions.md if issues found
- Return health summary
Output
JSON health report with pass/fail per check
Agent Assignment
- Primary: opencode
- Fallback: hermes
What ships with it
3 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.
- 6d ago First seen · 33 lines · 8 tokens per session scan A a96b05556dd8
heartbeat is a skill published in the GitHub repository modimihir07/agentic-os (164 stars, last pushed 25d ago), licensed MIT. It adds 8 tokens to every session and 212 once invoked, about $0.0000 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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Run a lightweight, non-destructive system healthcheck — disk usage, memory, CPU load, process count, hostname — and store a structured snapshot in session memory. Use when the user says "run a healthcheck", "check system health", "how's the server doing", "is everything ok", or asks for a status/diagnostics snapshot…
system-info
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screen_lock
Password-lock the machine's screen while every process keeps running.