Borrowing it
Nothing to install: this file belongs to cyanheads/faa-aircraft-registry-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/cyanheads/faa-aircraft-registry-mcp-server/main/CLAUDE.mdgit clone --depth 1 https://github.com/cyanheads/faa-aircraft-registry-mcp-serverWrote 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/instructions/cyanheads/faa-aircraft-registry-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/cyanheads/faa-aircraft-registry-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/cyanheads/faa-aircraft-registry-mcp-server/claude-md/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/instructions/cyanheads/faa-aircraft-registry-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/cyanheads/faa-aircraft-registry-mcp-server/claude-md.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 | $0.06739 | $0.06739 |
| Opus 5 | $0.03370 | $0.03370 |
| Sonnet 5 | $0.01348 | $0.01348 |
| Haiku 4.5 | $0.00674 | $0.00674 |
Grade A, and why
faa-aircraft-registry-mcp-server CLAUDE.md 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 11d 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.
This is a copy
69% identical to obsidian-mcp-server AGENTS.md — 384 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 440 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Developer Protocol
Server: faa-aircraft-registry-mcp-server
Version: 0.1.8
Framework: @cyanheads/mcp-ts-core ^0.12.3
Engines: Bun ≥1.3.0, Node ≥24.0.0
MCP SDK: @modelcontextprotocol/server ^2.0.0 (protocol revisions 2026-07-28 and 2025-*)
Zod: ^4.4.3
Read the framework docs first:
node_modules/@cyanheads/mcp-ts-core/CLAUDE.mdcontains the full API reference — builders, Context, error codes, exports, patterns. This file covers server-specific conventions only.
What This Server Is
An offline lookup server for the US civil aircraft registry. It indexes the FAA's public-domain Releasable Aircraft Database into an embedded SQLite + FTS5 mirror (built via the framework MirrorService), pre-joining MASTER → ACFTREF → ENGINE and decoding coded fields at query time. Keyless, no runtime network — every query hits the local index.
Server-as-source. The mirror is the source of truth at runtime; there is no upstream API to retry. The index is built out-of-band by mirror:init (never on startup) and refreshed daily; a cold (never-initialized) index is a hard ServiceUnavailable, not a silent empty result. See the api-mirror skill for the MirrorService model.
Owner-PII redaction is a first-class, fail-safe feature. FAA_REDACT_OWNER_PII defaults to redacted; unset/empty/malformed resolves to redacted. When redacted, owner name/address are dropped from output AND owner-name search is disabled. The redaction gate (a single chokepoint in registry-service) and the baked .mirror/ data are load-bearing — do not weaken either.
Core Rules
- Logic throws, framework catches. Tool/resource handlers are pure — throw on failure, no
try/catch. PlainErroris fine; the framework catches, classifies, and formats. Use error factories (notFound(),validationError(), etc.) when the error code matters. - Use
ctx.logfor request-scoped logging. Noconsolecalls. - Use
ctx.statefor tenant-scoped storage. Never access persistence directly. - Need input the caller didn't supply?
return ctx.requestInput(...)and readctx.inputswhen the handler is re-entered. Never await input mid-handler. - Secrets in env vars only — never hardcoded.
- Close the loop on issues. When implementing work tracked by a GitHub issue, comment on the issue with what landed and close it. Do both — a comment without a close leaves stale issues open; a close without a comment leaves no record of what shipped. The comment is for future readers — state the concrete changes, not the conversation that produced them.
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.
- 11d ago First seen · 440 lines · 6,739 tokens per session scan A b25e5c742e8e
faa-aircraft-registry-mcp-server CLAUDE.md is an instructions file published in the GitHub repository cyanheads/faa-aircraft-registry-mcp-server (2 stars, last pushed 17d ago), licensed Apache-2.0. It adds 6,739 tokens to every session, about $0.0337 per session on Opus 5. A static security scan graded it A with 0 findings. It is 69% identical to obsidian-mcp-server AGENTS.md, differing in 384 lines, and is treated as a copy.
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