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 authz-decision-receiptgit 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/authz-decision-receipt)<a href="https://agentmods.dev/skills/postoaklabs/ainumbers/authz-decision-receipt"><img src="https://agentmods.dev/badge/skills/postoaklabs/ainumbers/authz-decision-receipt/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/authz-decision-receipt"><img src="https://agentmods.dev/badge/skills/postoaklabs/ainumbers/authz-decision-receipt.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 | $0.00042 | $0.00545 |
| Opus 5.5 | $0.00017 | $0.00218 |
| Sonnet 5.5 | $0.00008 | $0.00109 |
| Haiku 4.5 | $0.00004 | $0.00055 |
Grade A, and why
authz-decision-receipt 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
AuthZ decision receipt
Make an AuthZEN decision, then prove the gate decision in the receipt.
Prompt
Prove that the access decision your gate claims is the decision it made.
- Call compute_authzen_conformance_fixture for one AuthZEN evaluation request (subject, action, resource). Record the expected decision.
- Send the same request to your gate. Record what it actually decided. If expected and actual differ, that difference is the whole finding.
- Call checklist_validate_definition on the checklist that defines this decision step. Record pass/fail and the definition digest.
- Call checklist_step_receipt for the step: this binds the decision, the definition digest, and the inputs into one receipt. Record execution_hash.
- Negative test: change the resource id in the request, re-run the step, confirm the receipt's hash changes. Quote both hashes.
- build_session_receipt over the fixture, the definition check, and both step receipts. Give me the ledger link.
- Write the note for the IAM review: the decision, the definition digest, the two hashes, and the ledger link, so an auditor re-verifies the gate without your help. 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 1b2a2dbfb6a1
- 19d ago First seen · 40 lines · 42 tokens per session scan A 96556c7bacb9
authz-decision-receipt is a skill published in the GitHub repository PostOakLabs/ainumbers (11 stars, last pushed yesterday), licensed MIT. It adds 42 tokens to every session and 545 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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