What is mcp-agents-hub CLAUDE.md?

A set of development instructions for an application with a React client, an Express server, and a Node.js 22.16.0 requirement. It lists setup, development, production-build, lint, preview, and Vitest test commands.

Installing dependencies, starting the client and server together or separately, building for production, running ESLint, previewing the client, and running unit, mock, or integration tests.

It gives contributors a consistent way to prepare the environment and check both the client and server without guessing which command to run.

How mcp-agents-ai/mcp-agents-hub configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to mcp-agents-ai/mcp-agents-hub. 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/mcp-agents-ai/mcp-agents-hub/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/mcp-agents-ai/mcp-agents-hub

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/mcp-agents-ai/mcp-agents-hub/claude-md/github.svg)](https://agentmods.dev/instructions/mcp-agents-ai/mcp-agents-hub/claude-md)

Your own site

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

Per session 1,236 This file is loaded in full into every session.

When invoked 1,236 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	$0.01236	$0.01236
Opus 5.5	$0.00494	$0.00494
Sonnet 5.5	$0.00247	$0.00247
Haiku 4.5	$0.00124	$0.00124

Measured 2mo ago against content hash e11235239733, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-agents-hub 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 · 119 lines

How it starts

The opening of the file, as written. The whole thing — 119 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/code) when working with code in this repository.

Common Development Commands

Environment Setup

Node Version Management: This project requires Node.js 22.16.0 (specified in .nvmrc)
- Always run nvm use when switching to this project
- Use ./setup.sh for automated environment setup including nvm and dependencies
- Alternative: manually run nvm use followed by npm ci

Development Commands

npm run dev - Start both client and server in development mode (uses concurrently)
npm run client:dev - Start only the React client (Vite dev server)
npm run server:dev - Start only the Express server with tsx watch mode
npm run build - Build both client and server for production
npm run lint - Run ESLint across the entire project
npm run preview - Preview production build of client

Testing

cd server && npm run test - Run all tests with Vitest
cd server && npm run test:watch - Run tests in watch mode
cd server && npm run test:integration - Run integration tests only
cd server && npm run test:mock - Run mock/unit tests only

Data Processing Scripts (Server)

cd server && npm run crawl-servers - Crawl MCP servers from the main repository
cd server && npm run crawl-servers-postprocess - Post-process crawled server data
cd server && npm run clean-duplicates - Remove duplicate entries
cd server && npm run process_categories - Process and organize category data
cd server && npm run process_locales - Process internationalization data
cd server && npm run process_githubinfo - Enrich servers with GitHub metadata

Architecture Overview

Project Structure

This is a monorepo workspace with two main packages:

client/: React frontend (Vite + TypeScript + Tailwind CSS)
server/: Express.js backend (TypeScript + Node.js)

Backend Architecture (server/)

Core Server Files

server.ts: Main Express application with route registration
routes/: API route handlers
- mcp.ts: MCP server-related endpoints
- hub.ts: Hub-specific endpoints
lib/: Core business logic
- mcpServers.ts: MCP server data management with locale-aware caching
- config.ts: Environment configuration
- githubEnrichment.ts: GitHub API integration for server metadata
- llm.ts & llmTools.ts: LLM integration for data processing

Read the full file on GitHub · 119 lines

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 · 119 lines · 1,236 tokens per session scan A e11235239733

Subscribe to this mod's changes

mcp-agents-hub CLAUDE.md is an instructions file published in the GitHub repository mcp-agents-ai/mcp-agents-hub (44 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 1,236 tokens to every session, about $0.0049 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 2026-08-30.

mcp-agents-hub CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mcp-agents-hub CLAUDE.mdmcp-agents-ai/mcp-agents-hub	Instructions file	44	7mo ago	Apache-2.0	A	1,236	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
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vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
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mcp-agents-hub: Instructions file for Claude Code