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 agent-identity-gategit 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/agent-identity-gate)<a href="https://agentmods.dev/skills/postoaklabs/ainumbers/agent-identity-gate"><img src="https://agentmods.dev/badge/skills/postoaklabs/ainumbers/agent-identity-gate/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/agent-identity-gate"><img src="https://agentmods.dev/badge/skills/postoaklabs/ainumbers/agent-identity-gate.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 | $0.00048 | $0.00580 |
| Opus 5.5 | $0.00019 | $0.00232 |
| Sonnet 5.5 | $0.00010 | $0.00116 |
| Haiku 4.5 | $0.00005 | $0.00058 |
Grade A, and why
agent-identity-gate 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
Agent identity gate
Verify a bot’s RFC 9421 signature, replay window, and pinned JWKS before letting it in.
Prompt
Decide whether an automated client may enter, and keep the decision receipt.
- Capture the client's request signature headers (RFC 9421 signature-input, signature, and the webbotauth document).
- Call verify_webbotauth_signature on the captured headers and the served webbotauth document. Record pass/fail and the key id used.
- Call check_webbotauth_nonce_replay with the nonce and timestamp window. Record whether the nonce was seen before.
- Call check_jwks_pinned_directory to confirm the signing key is the key the operator pinned in the directory. Record the pin match.
- Run the chain visa-tap-agent-verification with run_chain, which composes the three checks. Record the chain verdict and execution_hash.
- Negative test: replay step 2 with a one-byte-changed signature and confirm it fails. Quote the error.
- Give me the ledger link for the chain receipt.
- Write the gate note for your security log: client identity, which checks passed, the one negative test, and the ledger link. State what the gate does not cover (authorization and rate limits are your edge's job, not the signature's). 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 eb2f02a42978
- 19d ago First seen · 41 lines · 48 tokens per session scan A 5e42e9d9185a
agent-identity-gate is a skill published in the GitHub repository PostOakLabs/ainumbers (11 stars, last pushed yesterday), licensed MIT. It adds 48 tokens to every session and 580 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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