Borrowing it
Nothing to install: this file belongs to MrGo2/aena-mcp. 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/MrGo2/aena-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/MrGo2/aena-mcpWrote 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/mrgo2/aena-mcp/claude-md)<a href="https://agentmods.dev/instructions/mrgo2/aena-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/mrgo2/aena-mcp/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/mrgo2/aena-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/mrgo2/aena-mcp/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 | $0.00466 | $0.00466 |
| Opus 5.5 | $0.00186 | $0.00186 |
| Sonnet 5.5 | $0.00093 | $0.00093 |
| Haiku 4.5 | $0.00047 | $0.00047 |
Grade A, and why
aena-mcp 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 2mo 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
aena-mcp — agent notes
MCP server (TypeScript, stdio) exposing AENA flight data for the 50 Spanish
airports. Published as mcp-aena on npm.
Layout
src/index.ts— server, tool registration, tool handlers.src/aena/client.ts— the two API clients plus the pure normalizers (normalizeWebsiteRow,normalizeRestRow) and theFlighttype.src/aena/status.ts— flight status code → label map (shared by both APIs).src/format.ts—norm,matchesFlight,formatFlight(all pure).src/config.ts— env loading; REST credential defaults.test/*.test.mjs— node:test over fixtures, import fromdist/.
The two APIs, unified
- Website (public, no auth): ~14 days ahead, no past, local times.
- REST (OAuth2 Azure AD): ~54h past / ~24h future, UTC, gives codeshare operator.
Three API quirks the normalizers hide, each covered by a test:
- Arrivals is
"A"in REST but"L"in the website API. - REST
flightID.airlineIATAactually carries the ICAO code. mainFlight.aiportIATAis misspelled in AENA's API (missing "r").
Rules
- New parsing goes in a pure normalizer with a fixture-based test. Handlers do no parsing.
- A field the source cannot provide is left undefined, never faked.
pnpm testmust be green. A bug fix ships with the fixture that catches it.- Version lives in
package.json,manifest.jsonandserver.json— the release workflow fails if they disagree with the tag. Bump all three.
Credentials
REST needs AENA_CLIENT_SECRET (id and tenant have working defaults). Without
it the server runs website-only. The secret is stored in
~/Edelwyss/infrastructure/_CREDENTIALS_BACKUP/credentials.toml under [aena].
Never commit .env.
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.
- 2mo ago First seen · 41 lines · 466 tokens per session scan A 7ad6b6d3b198
aena-mcp CLAUDE.md is an instructions file published in the GitHub repository MrGo2/aena-mcp (2 stars, last pushed 2mo ago), licensed MIT. It adds 466 tokens to every session, about $0.0019 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 2026-08-31.
aena-mcp CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| aena-mcp CLAUDE.mdMrGo2/aena-mcp | Instructions file | 2 | 2mo ago | MIT | A | 466 | Claude Code |
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| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |