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 document-to-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/document-to-receipt)<a href="https://agentmods.dev/skills/postoaklabs/ainumbers/document-to-receipt"><img src="https://agentmods.dev/badge/skills/postoaklabs/ainumbers/document-to-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/document-to-receipt"><img src="https://agentmods.dev/badge/skills/postoaklabs/ainumbers/document-to-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 | $0.00044 | $0.00553 |
| Opus 5.5 | $0.00018 | $0.00221 |
| Sonnet 5.5 | $0.00009 | $0.00111 |
| Haiku 4.5 | $0.00004 | $0.00055 |
Grade A, and why
document-to-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
Document to receipt
Convert this document deterministically, prove the sanitisation, and emit the digest manifest.
Prompt
Move a document from someone's laptop trust into a verifiable record.
- Take one markdown document and its converted form (the published artifact). Synthetic or public text only.
- Call convert_markdown_document on the source. Record the conversion digest and whether the conversion is deterministic (re-run and compare).
- Diff the fresh conversion against the published artifact. If they differ, the published copy drifted; quote the differing lines.
- Call build_disclosure_manifest over the document's redaction set (the spans that must not ship). Record the manifest digest.
- Call verify_disclosure_inclusion to confirm the manifest covers exactly the redacted spans and nothing more. Record pass/fail.
- Negative test: add one span to the manifest, re-verify, confirm the check flags it. Revert.
- build_session_receipt over the conversion and manifest hashes; give me the ledger link.
- Write the records note: the document id, the conversion digest, the redaction manifest digest, and the ledger link, so records management re-verifies the artifact without keeping the original machine. 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 4e85b9020b57
- 19d ago First seen · 41 lines · 44 tokens per session scan A 2e74cd838a5b
document-to-receipt is a skill published in the GitHub repository PostOakLabs/ainumbers (11 stars, last pushed yesterday), licensed MIT. It adds 44 tokens to every session and 553 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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