What is yamcp CLAUDE.md?

Repository instructions for yamcp, a project that turns OpenAPI descriptions into secure MCP servers. OpenAPI is a machine-readable description of web APIs, and MCP is a standard way for AI tools to call services.

Use them when changing yamcp, especially its API parsing, authentication, access policies, rate limits, proxy, audit logging, or server code.

They define the project’s conventions and require builds, linting, formatting checks, and tests to pass before reporting a change as finished.

How adamgalmor/yamcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to adamgalmor/yamcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/adamgalmor/yamcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/adamgalmor/yamcp

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/adamgalmor/yamcp/claude-md/github.svg)](https://agentmods.dev/instructions/adamgalmor/yamcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/adamgalmor/yamcp/claude-md"><img src="https://agentmods.dev/badge/instructions/adamgalmor/yamcp/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/adamgalmor/yamcp/claude-md"><img src="https://agentmods.dev/badge/instructions/adamgalmor/yamcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 214 This file is loaded in full into every session.

When invoked 214 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00214	$0.00214
Opus 5.5	$0.00086	$0.00086
Sonnet 5.5	$0.00043	$0.00043
Haiku 4.5	$0.00021	$0.00021

Measured 2mo ago against content hash 912c5b2c99fe, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

yamcp 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.

CLAUDE.md · 21 lines

What it actually says

yamcp

OpenAPI → secure MCP server (scoped auth, allow/deny policy, rate limiting, redacted audit log). See README.md for the request pipeline and architecture.

Verification loop (run before reporting any change done)

npm run build   # tsc
npm run lint    # eslint src test
npx prettier --check .
npm test        # vitest run

This is the same gate CI runs (.github/workflows/ci.yml). All four must pass before a change is considered finished — don't hand back a diff you haven't run this against.

Conventions

Tests live in test/*.test.ts (vitest), fixtures in test/fixtures.
Source is organized by pipeline stage: src/spec (OpenAPI parsing), src/security (auth/policy/rate-limit), src/proxy, src/audit, src/server, src/config.
Format with npm run format (prettier) rather than hand-formatting.

Changes

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 · 21 lines · 214 tokens per session scan A 912c5b2c99fe

Subscribe to this mod's changes

yamcp CLAUDE.md is an instructions file published in the GitHub repository adamgalmor/yamcp (0 stars, last pushed 3mo ago), licensed MIT. It adds 214 tokens to every session, about $0.0009 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.

Building agents ai-agents api-gateway mcp mcp-server openapi

yamcp CLAUDE.md next to 6 instructions from other repositories
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yamcp: Instructions file for Claude Code