Borrowing it
Nothing to install: this file belongs to mikechao/metmuseum-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/mikechao/metmuseum-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/mikechao/metmuseum-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/mikechao/metmuseum-mcp/claude-md)<a href="https://agentmods.dev/instructions/mikechao/metmuseum-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/mikechao/metmuseum-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/mikechao/metmuseum-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/mikechao/metmuseum-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 | $0.00917 | $0.00917 |
| Opus 5 | $0.00458 | $0.00458 |
| Sonnet 5 | $0.00183 | $0.00183 |
| Haiku 4.5 | $0.00092 | $0.00092 |
Grade A, and why
metmuseum-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 10d 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 — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/claude-code) when working with code in this repository.
Project Overview
This is a Model Context Protocol (MCP) server that provides access to the Metropolitan Museum of Art Collection API. It exposes tools for searching and browsing artworks, plus an interactive MCP App for visual exploration.
Development Commands
# Install dependencies (requires pnpm)
corepack enable
pnpm install
# Build the project (includes syncing versions and bundling UI apps)
pnpm run build
# Type checking
pnpm run typecheck
# Linting (with auto-fix)
pnpm run lint
# Run both lint and typecheck
pnpm run check
Running the Server
- Stdio mode (default):
node dist/index.jsornpx -y metmuseum-mcp - HTTP mode:
node dist/index.js --http(listens onlocalhost:3001/mcp)
Environment variables for HTTP mode:
PORT(default:3001)HOST(default:127.0.0.1)ALLOWED_HOSTS(default:localhost,127.0.0.1)MET_API_TIMEOUT_MS(default:10000)
Architecture
Entry Point
src/index.ts- Main entry point that determines transport (stdio or HTTP) and starts the server
Server Setup
src/MetMuseumServer.ts- Creates and configures the MCP server, registers tools and resourcessrc/server-utils.ts- Transport layer utilities for stdio and streamable HTTP
API Layer
src/api/MetMuseumApiClient.ts- HTTP client for the Met Museum Collection API with rate limiting (80 req/s)
Tools (MCP Protocol)
src/tools/ListDepartmentsTool.ts- Lists all museum departmentssrc/tools/SearchMuseumObjectsTool.ts- Searches objects with filters (department, images, dates, etc.)src/tools/GetObjectTool.ts- Fetches detailed object data including optional base64 imagesrc/tools/OpenMetExplorerTool.ts- Launches the interactive explorer app
MCP Apps (UI)
Two HTML/JavaScript apps bundled via esbuild:
src/ui/met-explorer/- Main browsing app with search, filtering, paginationsrc/ui/object-details/- Standalone object detail view
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.
- 10d ago First seen · 112 lines · 917 tokens per session scan A c2d7ebf9aea7
metmuseum-mcp CLAUDE.md is an instructions file published in the GitHub repository mikechao/metmuseum-mcp (35 stars, last pushed 4mo ago), licensed MIT. It adds 917 tokens to every session, about $0.0046 per session on Opus 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 2026-08-30.
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