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 PostOakLabs/ainumbers --skill find-the-right-toolgit clone --depth 1 https://github.com/PostOakLabs/ainumbersWrote 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/postoaklabs/ainumbers/find-the-right-tool)<a href="https://agentmods.dev/skills/postoaklabs/ainumbers/find-the-right-tool"><img src="https://agentmods.dev/badge/skills/postoaklabs/ainumbers/find-the-right-tool/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/postoaklabs/ainumbers/find-the-right-tool"><img src="https://agentmods.dev/badge/skills/postoaklabs/ainumbers/find-the-right-tool.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 | $0.00054 | $0.00513 |
| Opus 5.5 | $0.00022 | $0.00205 |
| Sonnet 5.5 | $0.00011 | $0.00103 |
| Haiku 4.5 | $0.00005 | $0.00051 |
Grade A, and why
find-the-right-tool 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 15d 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
Find the right tool
I need to check X. Find the tool, run the sample once, and give me a link that reproduces it.
Prompt
Find the right tool for a check you have in mind, prove it runs, and leave a reproducible link.
- State the check you want in one sentence (for example: does this reserve attestation add up).
- Call find_tool with that sentence. List the top three candidate tools with their one-line descriptions.
- Pick one candidate. Read its declared inputSchema and confirm the fields make sense for your check; if none fit, take the next candidate.
- Run the tool once with its synthetic sample inputs via the worker. Record the verdict and the execution_hash.
- Call find_chain to see whether the tool belongs to a longer chain; note the chain name if so.
- Call build_workflow_links for the node. Give me the deep link that re-opens the node page with the same inputs.
- Write a note for a colleague who has never used the site: what you wanted checked, which tool you found, the verdict, and the deep link. If a named tool is not in your tool list, call call_tool with { "name": "", "arguments": { … } }. It runs the same validation and returns the same receipt.
How to run
Connect an MCP-capable host to https://mcp.ainumbers.co/mcp, then give the prompt above to the assistant.
Use synthetic inputs only. Never paste personal or production data.
Verify what came back
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.
- 15d ago Changed bed11b60308a
- 19d ago First seen · 39 lines · 54 tokens per session scan A e2750e36adb8
find-the-right-tool is a skill published in the GitHub repository PostOakLabs/ainumbers (11 stars, last pushed yesterday), licensed MIT. It adds 54 tokens to every session and 513 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-27.
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