Claude Code Explorer MCP

warrioraashuu Codemaster — MCP Server

A standalone Model Context Protocol (MCP) server that lets any MCP-compatible client explore the Claude Code source code. Rebranded and published by warrioraashuu. Supports STDIO, Streamable HTTP, and SSE transports.

What It Does

Exposes 8 tools, 3 resources, and 5 prompts for navigating the ~1,900-file, 512K+ line Claude Code codebase. This is the official npm package: warrioraashuu-codemaster.

Transports

Tools

Resources

Prompts

Setup

cd mcp-servernpm installnpm run build

Run Locally (STDIO)

npm start# or with custom source path:CLAUDE_CODE_SRC_ROOT=/path/to/src npm start

Run Locally (HTTP)

npm run start:http# Streamable HTTP at http://localhost:3000/mcp# Legacy SSE at http://localhost:3000/sse# Health check at http://localhost:3000/health

With Authentication

MCP_API_KEY=your-secret-token npm run start:http# Clients must include: Authorization: Bearer your-secret-token

Configuration

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):

{  "mcpServers": {    "warrioraashuu-codemaster": {      "command": "node",      "args": ["/absolute/path/to/claude-code/mcp-server/dist/index.js"],      "env": {        "CLAUDE_CODE_SRC_ROOT": "/absolute/path/to/claude-code/src"      }    }  }}

VS Code (GitHub Copilot)

Add to .vscode/mcp.json in your workspace:

{  "servers": {    "claude-code-explorer": {      "type": "stdio",      "command": "node",      "args": ["${workspaceFolder}/mcp-server/dist/index.js"],      "env": {        "CLAUDE_CODE_SRC_ROOT": "${workspaceFolder}/src"      }    }  }}

Cursor

Add to ~/.cursor/mcp.json:

{  "mcpServers": {    "claude-code-explorer": {      "command": "node",      "args": ["/absolute/path/to/claude-code/mcp-server/dist/index.js"],      "env": {        "CLAUDE_CODE_SRC_ROOT": "/absolute/path/to/claude-code/src"      }    }  }}

Environment Variables

Remote HTTP Client Configuration

For Claude Desktop connecting to a remote server:

{  "mcpServers": {    "claude-code-explorer": {      "url": "https://your-deployment.railway.app/mcp",      "headers": {        "Authorization": "Bearer your-secret-key"      }    }  }}

Deployment

Railway

1. Connect your GitHub repo to Railway
2. Railway automatically detects the mcp-server/Dockerfile
3. Set environment variables in the Railway dashboard:
   • MCP_API_KEY — a secret bearer token
   • PORT is set automatically by Railway
4. Deploy — available at your-app.railway.app

Or via CLI:

railway initrailway up

Vercel

npx vercel

Set environment variables in the Vercel dashboard:

• CLAUDE_CODE_SRC_ROOT — path where src/ files are bundled
• MCP_API_KEY — bearer token

Note: Vercel functions are stateless with execution time limits (10s hobby / 60s pro). Best for simple tool calls. For persistent SSE streams, use Railway or Docker.

Docker

# From repo rootdocker build -f mcp-server/Dockerfile -t claude-code-mcp .docker run -p 3000:3000 -e MCP_API_KEY=your-secret claude-code-mcp

Works on any Docker host: Fly.io, Render, AWS ECS, Google Cloud Run, etc.

Prompts

The server also exposes prompt templates for guided exploration:

Example Usage

Once connected, you can ask your AI assistant things like:

• "List all Claude Code tools"
• "Show me the BashTool implementation"
• "Search for how permissions are checked"
• "What files are in the bridge directory?"
• "Read the QueryEngine.ts file, lines 1-100"
• "How does the MCP client connection work?"
• Use the explain_tool prompt with "FileEditTool" to get a full breakdown
• Use how_does_it_work with "bridge" to understand IDE integration

Publishing to MCP Registry

This server is published to the MCP Registry via GitHub Actions. On a tagged release (v*), the workflow:

1. Publishes the npm package to npmjs.org
2. Authenticates with the MCP Registry using GitHub OIDC
3. Publishes the server.json metadata to the registry

To publish manually:

# Install the MCP Publisher CLIcurl -L "https://github.com/modelcontextprotocol/registry/releases/latest/download/mcp-publisher_$(uname -s | tr '[:upper:]' '[:lower:]')_$(uname -m | sed 's/x86_64/amd64/;s/aarch64/arm64/').tar.gz" | tar xz mcp-publisher
# Authenticate (GitHub OAuth)./mcp-publisher login github
# Publishcd mcp-server../mcp-publisher publish

Registry name: warrioraashuu-codemaster

Development

npm installnpm run dev    # Watch mode TypeScript compilationnpm run build  # Compile TypeScript to dist/npm start      # Run STDIO servernpm run start:http  # Run HTTP server

Architecture

mcp-server/├── src/│   ├── server.ts    — Shared MCP server (tools, resources, prompts) — transport-agnostic│   ├── index.ts     — STDIO entrypoint (local)│   └── http.ts      — HTTP + SSE entrypoint (remote)├── api/│   ├── index.ts     — Vercel serverless function│   └── vercelApp.ts — Express app for Vercel├── Dockerfile       — Docker build (Railway, Fly.io, etc.)├── railway.json     — Railway deployment config├── package.json└── tsconfig.json