Claude Code MCP

Claude Code MCP is an implementation of Claude Code as a Model Context Protocol (MCP) server. This project allows you to use Claude Code's powerful software engineering capabilities through the standardized MCP interface.

What is Claude Code?

Claude Code is Anthropic's CLI tool for software engineering tasks, powered by Claude. It provides a set of tools and capabilities that help developers with:

• Code generation and editing
• Code review and analysis
• Debugging and troubleshooting
• File system operations
• Shell command execution
• Project exploration and understanding

The original implementation is available as a JavaScript module that defines prompts and tools for interacting with Claude's API.

What is MCP?

The Model Context Protocol (MCP) is a standardized interface for AI models that enables consistent interaction patterns across different models and providers. MCP defines:

• Tools: Functions that models can call to perform actions
• Resources: External data that models can access
• Prompts: Predefined conversation templates

By implementing Claude Code as an MCP server, we make its capabilities available to any MCP-compatible client, allowing for greater interoperability and flexibility.

Features

• Full implementation of Claude Code functionality as an MCP server
• Provides tools for file operations, shell commands, and code analysis
• Exposes resources for accessing file system and environment information
• Includes prompts for general CLI interaction and code review
• Compatible with any MCP client
• TypeScript implementation with full type safety

Installation

# Clone the repository
git clone https://github.com/auchenberg/claude-code-mcp.git
cd claude-code-mcp

# Install dependencies
npm install

# Build the project
npm run build

Usage

Running as a standalone server

# Start the server
npm start

Using with MCP clients

Claude Code MCP can be used with any MCP client. Here's an example of how to connect to it using the MCP TypeScript SDK:

import { Client } from "@modelcontextprotocol/sdk/client/index.js";
import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";

const transport = new StdioClientTransport({
  command: "node",
  args: ["dist/index.js"]
});

const client = new Client(
  {
    name: "example-client",
    version: "1.0.0"
  },
  {
    capabilities: {
      prompts: {},
      resources: {},
      tools: {}
    }
  }
);

await client.connect(transport);

// Use Claude Code through MCP
const result = await client.callTool({
  name: "bash",
  arguments: {
    command: "ls -la"
  }
});

console.log(result);

Available Tools

Claude Code MCP provides the following tools:

• bash: Execute shell commands with security restrictions and timeout options
• readFile: Read files from the filesystem with options for line offsets and limits
• listFiles: List files and directories with detailed metadata
• searchGlob: Search for files matching a glob pattern
• grep: Search for text in files with regex pattern support
• think: A no-op tool for thinking through complex problems
• codeReview: Analyze and review code for bugs, security issues, and best practices
• editFile: Create or edit files with specified content

Tool Details

bash

{
  command: string;  // The shell command to execute
  timeout?: number; // Optional timeout in milliseconds (max 600000)
}

The bash tool includes security restrictions that prevent execution of potentially dangerous commands like curl, wget, and others.

readFile

{
  file_path: string; // The absolute path to the file to read
  offset?: number;   // The line number to start reading from
  limit?: number;    // The number of lines to read
}

searchGlob

{
  pattern: string;  // The glob pattern to match files against
  path?: string;    // The directory to search in (defaults to current working directory)
}

grep

{
  pattern: string;   // The regular expression pattern to search for
  path?: string;     // The directory to search in (defaults to current working directory)
  include?: string;  // File pattern to include in the search (e.g. "*.js", "*.{ts,tsx}")
}

Available Resources

• file: Access file contents (file://{path})

  • Provides direct access to file contents with proper error handling
  • Returns the full text content of the specified file

• directory: List directory contents (dir://{path})

  • Returns a JSON array of file information objects
  • Each object includes name, path, isDirectory, size, and modified date

• environment: Get system environment information (env://info)

  • Returns information about the system environment
  • Includes Node.js version, npm version, OS info, and environment variables

Available Prompts

• generalCLI: General CLI prompt for Claude Code

  • Provides a comprehensive system prompt for Claude to act as a CLI tool
  • Includes guidelines for tone, style, proactiveness, and following conventions
  • Automatically includes environment details

• codeReview: Prompt for reviewing code

  • Specialized prompt for code review tasks
  • Analyzes code for bugs, security vulnerabilities, performance issues, and best practices

• prReview: Prompt for reviewing pull requests

  • Specialized prompt for PR review tasks
  • Analyzes PR changes and provides comprehensive feedback

• initCodebase: Initialize a new CLAUDE.md file with codebase documentation

  • Creates documentation for build/lint/test commands and code style guidelines
  • Useful for setting up a new project with Claude Code

Development

# Run in development mode with auto-reload
npm run dev

Architecture

Claude Code MCP is built with a modular architecture:

claude-code-mcp/
├── src/
│   ├── server/
│   │   ├── claude-code-server.ts  # Main server setup
│   │   ├── tools.ts               # Tool implementations
│   │   ├── prompts.ts             # Prompt definitions
│   │   └── resources.ts           # Resource implementations
│   ├── utils/
│   │   ├── bash.ts                # Shell command utilities
│   │   └── file.ts                # File system utilities
│   └── index.ts                   # Entry point
├── package.json
├── tsconfig.json
└── README.md

The implementation follows these key principles:

1. Modularity: Each component (tools, prompts, resources) is implemented in a separate module
2. Type Safety: Full TypeScript type definitions for all components
3. Error Handling: Comprehensive error handling for all operations
4. Security: Security restrictions for potentially dangerous operations

Implementation Details

MCP Server Setup

The main server is set up in claude-code-server.ts:

export async function setupClaudeCodeServer(server: McpServer): Promise<void> {
  // Set up Claude Code tools
  setupTools(server);
  
  // Set up Claude Code prompts
  setupPrompts(server);
  
  // Set up Claude Code resources
  setupResources(server);
}

Tool Implementation

Tools are implemented using the MCP SDK's tool registration method:

server.tool(
  "toolName",
  "Tool description",
  {
    // Zod schema for tool arguments
    param1: z.string().describe("Parameter description"),
    param2: z.number().optional().describe("Optional parameter description")
  },
  async ({ param1, param2 }) => {
    // Tool implementation
    return {
      content: [{ type: "text", text: "Result" }]
    };
  }
);

Resource Implementation

Resources are implemented using the MCP SDK's resource registration method:

server.resource(
  "resourceName",
  new ResourceTemplate("resource://{variable}", { list: undefined }),
  async (uri, variables) => {
    // Resource implementation
    return {
      contents: [{
        uri: uri.href,
        text: "Resource content"
      }]
    };
  }
);

License

MIT

Acknowledgements

• Claude Code by Anthropic
• Model Context Protocol
• MCP TypeScript SDK

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Disclaimer

This project is not officially affiliated with Anthropic. Claude Code is a product of Anthropic, and this project is an independent implementation of Claude Code as an MCP server.