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 tao12345666333/ankaloop --skill heartbeatgit clone --depth 1 https://github.com/tao12345666333/ankaloopWrote 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/tao12345666333/ankaloop/heartbeat)<a href="https://agentmods.dev/skills/tao12345666333/ankaloop/heartbeat"><img src="https://agentmods.dev/badge/skills/tao12345666333/ankaloop/heartbeat/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/tao12345666333/ankaloop/heartbeat"><img src="https://agentmods.dev/badge/skills/tao12345666333/ankaloop/heartbeat.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00042 | $0.00507 |
| Opus 5 | $0.00021 | $0.00253 |
| Sonnet 5 | $0.00008 | $0.00101 |
| Haiku 4.5 | $0.00004 | $0.00051 |
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 12d 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
Periodic agent wake-up to check for tasks in HEARTBEAT.md.
How It Works
- Every 30 minutes, the scheduler triggers this skill
- Read
HEARTBEAT.mdfrom the workspace root - If file is empty or has no actionable content → reply
HEARTBEAT_OKand stop - If file has tasks → execute them one by one
- Mark completed tasks by moving them to the
## Completedsection - If
telegram-senderskill is available and the task warrants notification, send a Telegram update
HEARTBEAT.md Format
# Heartbeat Tasks
## Active Tasks
- Check CI status for open PRs and fix any failures
- Review and merge dependabot PRs if tests pass
## Completed
- [2026-02-17] Cleaned up stale branches
Rules
- Empty = skip: If
HEARTBEAT.mdis missing, empty, or only has headers/comments, replyHEARTBEAT_OK - Task markers: Lines starting with
-under## Active Tasksare actionable - Completion: After finishing a task, move it to
## Completedwith today's date prefix - Errors: If a task fails, leave it in Active Tasks and append
(FAILED: reason)to the line - Safety: Never delete
HEARTBEAT.md, only modify task entries - Scope: Tasks should be self-contained and completable within the timeout (5 minutes)
Skipable Content
These are not actionable (skip them):
- Empty lines
- Lines starting with
#(headers) - Lines starting with
<!--(HTML comments) - Lines with only
- [ ]or- [x](empty checkboxes)
What ships with it
2 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.
- 12d ago First seen · 55 lines · 42 tokens per session scan A ec00b4f289f2
heartbeat is a skill published in the GitHub repository tao12345666333/ankaloop (48 stars, last pushed 13d ago), licensed Apache-2.0. It adds 42 tokens to every session and 507 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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