Borrowing it
Nothing to install: this file belongs to Frihet-io/frihet-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/Frihet-io/frihet-mcp/main/AGENTS.mdgit clone --depth 1 https://github.com/Frihet-io/frihet-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/frihet-io/frihet-mcp/agents-md)<a href="https://agentmods.dev/instructions/frihet-io/frihet-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/frihet-io/frihet-mcp/agents-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/frihet-io/frihet-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/frihet-io/frihet-mcp/agents-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 | $0.00801 | $0.00801 |
| Opus 5.5 | $0.00320 | $0.00320 |
| Sonnet 5.5 | $0.00160 | $0.00160 |
| Haiku 4.5 | $0.00080 | $0.00080 |
Grade A, and why
frihet-mcp AGENTS.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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Frihet MCP Server
Open-source MCP server for Frihet ERP. TypeScript, Node >= 20, MIT license. Distributed via npm + Cloudflare Worker (mcp.frihet.io) + Smithery + Anthropic registry.
Build & Test
npm install # Install deps
npm run build # tsc → dist/
npm test # Run native node test suite
npm start # Run server via stdio (local debug)
Pre-commit: npm run build must succeed. npm test must pass.
Code Style
- TypeScript strict mode (
strict: true) - ES2022 target, NodeNext module resolution
- Tools use the established canonical snake_case names, such as
create_invoice - Return human-readable MCP
contentplus outputSchema-validstructuredContent - Zod schemas on
inputSchema(strict) - Preserve actionable, sanitized API errors through the shared error helpers
- One tool per logical operation — no batching unless explicit
- Async/await throughout, no callbacks
- Logger from
src/logger.ts— neverconsole.login tool code - Observability: every tool wrapped via
src/observability.ts(Langfuse)
Conventions
- Commit messages:
feat(tools): add <family> CRUD/fix(invoices): handle null totals - Branch names:
feat/<descriptive-slug> - Atomic commits — one tool family per commit minimum
- Update README.md tool count badge when adding tools
- Tool descriptions are concise and bilingual (English / Spanish)
- Test fixtures in
src/__tests__/fixtures/
Testing standards
- Every mutating tool must have at least 1 idempotency test
- Every tool must have at least 1 schema rejection test (bad input)
- Every tool must have at least 1 happy path test
- Coverage target: > 80% lines, 100% on auth/scope branches
Gotchas
- NEVER mutate
process.env— read once into config object - API client must respect
Idempotency-Key— propagate from tool input when present - Don't log full request bodies — PII (NIF/IBAN/email). Use
mask()from logger - Cloudflare Worker is a separate deployment surface — pinging the Worker is not a substitute for testing the npm package locally
- MCP SDK breaking changes — pin
@modelcontextprotocol/sdkminor; major bumps require manual review - Postinstall script —
node scripts/postinstall.js || trueruns harmlessly. Do not make required
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.
- 1mo ago First seen · 73 lines · 801 tokens per session scan A beb12f4ed5ff
frihet-mcp AGENTS.md is an instructions file published in the GitHub repository Frihet-io/frihet-mcp (12 stars, last pushed today), licensed MIT. It adds 801 tokens to every session, about $0.0032 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.
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