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 uptimerobot/ai --skill create-heartbeat-monitorgit clone --depth 1 https://github.com/uptimerobot/aiWrote 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/uptimerobot/ai/create-heartbeat-monitor)<a href="https://agentmods.dev/skills/uptimerobot/ai/create-heartbeat-monitor"><img src="https://agentmods.dev/badge/skills/uptimerobot/ai/create-heartbeat-monitor/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/uptimerobot/ai/create-heartbeat-monitor"><img src="https://agentmods.dev/badge/skills/uptimerobot/ai/create-heartbeat-monitor.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 | $0.00037 | $0.00820 |
| Opus 5 | $0.00018 | $0.00410 |
| Sonnet 5 | $0.00007 | $0.00164 |
| Haiku 4.5 | $0.00004 | $0.00082 |
Grade A, and why
create-heartbeat-monitor scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -fsS --retry 3 "https://heartbeat.uptimerobot.com/m800123456-abcd1234" > /dev/null How it starts
The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create a HEARTBEAT monitor
Preflight — read first. If you cannot see any
uptimerobot:*MCP tools in your tool list, invoke theuptimerobot:setupskill before doing anything else. Do not tell the user the MCP is misconfigured —setup's Step 0 detects the common case (server connected, tools loaded after session start) and resolves it without re-keying.
Use when the user wants to monitor a scheduled job / cron / background worker / backup script. The target system must send periodic HTTP requests to a URL that UptimeRobot generates. If pings stop arriving for longer than the interval (plus optional grace period), the monitor goes down.
This is the inverse of the other monitor types: UptimeRobot does not probe anything, it waits for incoming pings.
Tool: create-monitor
Required params: friendlyName, type: "HEARTBEAT".
Do not send url. The server generates it.
Minimal call
{
"friendlyName": "Nightly DB backup",
"type": "HEARTBEAT",
"interval": 86400,
"gracePeriod": 1800
}
The response includes the generated URL, shaped like:
https://heartbeat.uptimerobot.com/m<id>-<hash>
Show that URL to the user so they can wire it into their cron / job.
Common optional params
interval— how often the job is expected to ping (seconds, 30–86400). Required for this monitor to be useful; without it, defaults apply but may not match the user's schedule.gracePeriod— seconds of tolerance pastintervalbefore marking down (0–86400). Use this for jobs with variable duration.assignedAlertContacts,tagNames,maintenanceWindowsIds— same as other types.
Example: hourly job with 5-minute grace
{
"friendlyName": "Hourly cache warmer",
"type": "HEARTBEAT",
"interval": 3600,
"gracePeriod": 300,
"assignedAlertContacts": [
{ "alertContactId": "10", "threshold": 0, "recurrence": 60 }
],
"tagNames": ["jobs", "backend"]
}
Using the generated URL
The target job must hit the URL to signal "I ran successfully". Shell example:
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 · 84 lines · 37 tokens per session scan A bd39d05df51e
create-heartbeat-monitor is a skill published in the GitHub repository uptimerobot/ai (24 stars, last pushed 1mo ago), licensed MIT. It adds 37 tokens to every session and 820 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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