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 askmarcel/AskMarcel-MCP --skill hvac-guided-diagnosisgit clone --depth 1 https://github.com/askmarcel/AskMarcel-MCPWrote 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/askmarcel/askmarcel-mcp/hvac-guided-diagnosis)<a href="https://agentmods.dev/skills/askmarcel/askmarcel-mcp/hvac-guided-diagnosis"><img src="https://agentmods.dev/badge/skills/askmarcel/askmarcel-mcp/hvac-guided-diagnosis/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/askmarcel/askmarcel-mcp/hvac-guided-diagnosis"><img src="https://agentmods.dev/badge/skills/askmarcel/askmarcel-mcp/hvac-guided-diagnosis.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 | $0.00024 | $0.00276 |
| Opus 5 | $0.00012 | $0.00138 |
| Sonnet 5 | $0.00005 | $0.00055 |
| Haiku 4.5 | $0.00002 | $0.00028 |
Grade A, and why
hvac-guided-diagnosis 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 10d 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
Guided HVAC diagnosis (PAC Air/Eau)
Use MCP tool diagnose_guided — not diagnose — for interactive troubleshooting on air-to-water heat pumps.
Loop
request_id is required on every call. Use a new request_id for each turn.
diagnose_guided({ message: "<symptom>", request_id: "<unique-turn-1>" })- If
kind === "question": relayquestionverbatim to the technician (do not rephrase measurement requests). diagnose_guided({ message: "<technician reply>", continuation: "<unchanged>", request_id: "<unique-turn-2>" })- Repeat until
kindisverdict,emergency, orout_of_scope.
Out of scope
If kind === "out_of_scope", fall back to diagnose (one-shot sourced lookup).
Do not
- Invent causes or measurements — trust
ledgerfrom the server. - Modify the
continuationstring. - Use
diagnose_guidedfor boilers, split AC, or unknown equipment families.
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.
- 10d ago First seen · 28 lines · 24 tokens per session scan A 68cb35001c47
hvac-guided-diagnosis is a skill published in the GitHub repository askmarcel/AskMarcel-MCP (0 stars, last pushed 15d ago), licensed MIT. It adds 24 tokens to every session and 276 once invoked, about $0.0001 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 2026-08-31.
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