Claude Code MCP server

The claude-code-mcp project is an MCP server that lets you access Claude Code's capabilities through a standardized interface. It acts as a bridge between MCP clients and the Claude Code command-line tool, providing functions like code explanation, review, fixing, editing, testing, and more.

Installation

Prerequisites

• Node.js (>= v18 recommended, tested with v22.14.0)
• npm (or yarn)
• Claude Code command installed and authenticated (https://docs.anthropic.com/en/docs/agents-and-tools/claude-code/overview)

Installation Methods

Using npx (Recommended)

Run the server directly without installation:

npx @kunihiros/claude-code-mcp

Global Installation

Install the package globally:

npm install -g claude-code-mcp

Then run it as a command:

claude-code-mcp

Local Installation

Clone and install dependencies:

git clone https://github.com/KunihiroS/claude-code-mcp.git
cd claude-code-mcp/claude-code-server
npm install
npm run build

Run the built script:

node build/index.js

Configuration

Environment Variables

Configure using one of these methods:

MCP Host Settings (Recommended for npx)

Add to your MCP Host application settings:

"claude-code-server": {
  "command": "npx",
  "args": [
    "-y",
    "@kunihiros/claude-code-mcp"
  ],
  "env": {
    "CLAUDE_BIN": "/path/to/your/claude/executable",
    "LOG_LEVEL": "info"
  },
  "disabled": false
}

Using .env File

Create a .env file where you run the command or a global ~/.claude-code-mcp.env file:

CLAUDE_BIN=/path/to/your/claude/executable
LOG_LEVEL=info

Environment Variables Details

• CLAUDE_BIN: Path to Claude CLI executable (Required)
  • Example: /home/linuxbrew/.linuxbrew/bin/claude or C:\Users\YourUser\AppData\Local\bin\claude.exe
• LOG_LEVEL: Log level (Optional, defaults to info)
  • Values: debug, info, warn, error

Available Tools

The server provides these tools:

• explain_code: Provides detailed explanation of code
• review_code: Reviews given code
• fix_code: Fixes bugs or issues in code
• edit_code: Edits code based on instructions
• test_code: Generates tests for code
• simulate_command: Simulates command execution
• your_own_query: Sends custom queries with context

Usage Notes

• Log file (claude-code-mcp.log) is created in:
  • Project root (first attempt)
  • User's home directory (fallback)
  • /tmp/claude-code-mcp.log (final fallback)
• Log rotation is not yet implemented
• Primarily tested with Claude CLI on Ubuntu/WSL2

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "claude-code-server" '{"command":"npx","args":["-y","@kunihiros/claude-code-mcp"],"env":{"CLAUDE_BIN":"/path/to/your/claude/executable","LOG_LEVEL":"info"},"disabled":false}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "claude-code-server": {
            "command": "npx",
            "args": [
                "-y",
                "@kunihiros/claude-code-mcp"
            ],
            "env": {
                "CLAUDE_BIN": "/path/to/your/claude/executable",
                "LOG_LEVEL": "info"
            },
            "disabled": false
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "claude-code-server": {
            "command": "npx",
            "args": [
                "-y",
                "@kunihiros/claude-code-mcp"
            ],
            "env": {
                "CLAUDE_BIN": "/path/to/your/claude/executable",
                "LOG_LEVEL": "info"
            },
            "disabled": false
        }
    }
}

3. Restart Claude Desktop for the changes to take effect