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 certified-payroll-recomputegit 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/certified-payroll-recompute)<a href="https://agentmods.dev/skills/postoaklabs/ainumbers/certified-payroll-recompute"><img src="https://agentmods.dev/badge/skills/postoaklabs/ainumbers/certified-payroll-recompute/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/certified-payroll-recompute"><img src="https://agentmods.dev/badge/skills/postoaklabs/ainumbers/certified-payroll-recompute.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 | $0.00040 | $0.00531 |
| Opus 5.5 | $0.00016 | $0.00212 |
| Sonnet 5.5 | $0.00008 | $0.00106 |
| Haiku 4.5 | $0.00004 | $0.00053 |
Grade A, and why
certified-payroll-recompute 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
Certified payroll recompute
Recompute certified payroll against prevailing wage and sign the receipt.
Prompt
Recompute a certified payroll from the raw timesheets so the certification has a hash behind it.
- Prepare a synthetic weekly payroll: workers, classifications, hours per day, fringe payments.
- Call recompute_certified_payroll_pwa with the synthetic data and the applicable prevailing-wage determinations. Record the computed wage rates, the underpayments flagged, and the per-worker totals.
- Confirm the recomputation matches what was certified for the week; quote any line that differs with both numbers.
- Call verify_execution_hash (send the artifact or its hash as claimed_hash) over the recompute output. Record the hash.
- Negative test: change one worker's hours by one, re-run, confirm both the totals and the hash change. Revert.
- build_session_receipt over the runs; give me the ledger link.
- Write the note for the compliance officer: the week covered, the flagged lines, the hash, and the ledger link. The certification now points at a receipt instead of a spreadsheet. Call shape: every ChainGraph node tool takes its arguments nested under one wrapper object, e.g. {"policy_parameters": { ... }}; flat arguments are discarded by schema validation. 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 a460558422ba
- 19d ago First seen · 40 lines · 40 tokens per session scan A c118b060eaec
certified-payroll-recompute is a skill published in the GitHub repository PostOakLabs/ainumbers (11 stars, last pushed yesterday), licensed MIT. It adds 40 tokens to every session and 531 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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