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 cross-chain-transfer-checkgit 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/cross-chain-transfer-check)<a href="https://agentmods.dev/skills/postoaklabs/ainumbers/cross-chain-transfer-check"><img src="https://agentmods.dev/badge/skills/postoaklabs/ainumbers/cross-chain-transfer-check/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/cross-chain-transfer-check"><img src="https://agentmods.dev/badge/skills/postoaklabs/ainumbers/cross-chain-transfer-check.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 | $0.00049 | $0.00536 |
| Opus 5.5 | $0.00020 | $0.00214 |
| Sonnet 5.5 | $0.00010 | $0.00107 |
| Haiku 4.5 | $0.00005 | $0.00054 |
Grade A, and why
cross-chain-transfer-check 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
Cross-chain transfer check
Validate a CCTP v2 transfer and classify L2 finality before you rely on it.
Prompt
Check a bridged transfer before you treat it as settled.
- Take the synthetic CCTP v2 message attestation for the transfer (nonce, amount, source/destination domain).
- Call validate_cctp_v2_transfer. Record the attestation verdict and the mint/destroy pair it implies.
- Call check_linea_l2_finality_window for the source chain state. Record whether the finality window has fully elapsed and what remains exposed before it does.
- Run the chain arc-dvp-settlement with run_chain to place the transfer in a settlement context. Record execution_hash.
- Failure test: re-validate with the fast-transfer flag set but the finality window not elapsed; confirm the tool flags the gap. Quote the flag.
- build_session_receipt over the checks; give me the ledger link.
- Write the treasury note: transfer id, attestation verdict, finality status, the exposure window in minutes, and the ledger link. 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 672458d6c7e7
- 19d ago First seen · 40 lines · 49 tokens per session scan A 45bf2217afb5
cross-chain-transfer-check is a skill published in the GitHub repository PostOakLabs/ainumbers (11 stars, last pushed yesterday), licensed MIT. It adds 49 tokens to every session and 536 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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