thebacons/mcp-server-claude-llm

MCP Server for Claude LLM

A Model Context Protocol (MCP) server that provides access to Claude 3.5 Sonnet and Claude 3 Opus models through Gemini CLI.

Features

• 🤖 Access to Claude 3.5 Sonnet - Latest and most capable model
• 🧠 Access to Claude 3 Opus - Powerful model for complex tasks
• 🔧 Full Gemini CLI integration
• 📦 Easy setup with npm
• 🔒 Secure API key handling via environment variables
• ⚡ CommonJS compatible for wide Node.js support

Prerequisites

• Node.js 18+
• Gemini CLI installed (npm install -g @google/gemini-cli)
• Anthropic API key from console.anthropic.com

Installation

# Clone the repository
git clone https://github.com/yourusername/mcp-server-claude-llm
cd mcp-server-claude-llm

# Install dependencies
npm install

# Create .env file
echo "ANTHROPIC_API_KEY=your-api-key-here" > .env

Configuration

1. Set up your API key

Create a .env file in the project root:

ANTHROPIC_API_KEY=sk-ant-api03-your-key-here

2. Configure Gemini CLI

Add to your Gemini CLI settings (~/.gemini/settings.json on macOS/Linux or C:\Users\YOUR_USERNAME\.gemini\settings.json on Windows):

{
  "mcpServers": {
    "claude": {
      "command": "node",
      "args": ["/absolute/path/to/mcp-server-claude-llm/server.js"],
      "cwd": "/absolute/path/to/mcp-server-claude-llm",
      "timeout": 30000,
      "trust": false
    }
  }
}

Windows example:

{
  "mcpServers": {
    "claude": {
      "command": "node",
      "args": ["C:\\path\\to\\mcp-server-claude-llm\\server.js"],
      "cwd": "C:\\path\\to\\mcp-server-claude-llm",
      "timeout": 30000,
      "trust": false
    }
  }
}

3. Restart Gemini CLI

# Close any running Gemini instances
# Then start fresh
gemini

Usage

Once configured, you can use Claude models directly in Gemini CLI:

Basic Usage

Use claude_sonnet to explain quantum computing in simple terms

Use claude_opus to write a detailed analysis of climate change

Example Commands

# Code assistance
Use claude_sonnet to review this code and suggest improvements

# Creative writing
Use claude_opus to write a short story about AI and humanity

# Technical documentation
Use claude_sonnet to create API documentation for this project

# Data analysis
Use claude_opus to analyze this data and provide insights

Verification

To verify your setup is working:

1. In Gemini CLI, type:

   /mcp
   

   You should see:

   🟢 claude - Ready (2 tools)
     - claude_sonnet
     - claude_opus
   

2. Test a simple query:

   Use claude_sonnet to say hello
   

Troubleshooting

Server shows as disconnected

• Ensure the paths in settings.json are absolute paths
• Check that .env file exists and contains valid API key
• Try running node server.js directly to see any errors

Authentication errors

• Verify your API key is valid at console.anthropic.com
• Ensure no extra spaces or quotes in .env file
• Check API key starts with sk-ant-api03-

CommonJS errors

• This server uses dynamic imports for ESM compatibility
• Requires Node.js 18 or higher
• If issues persist, check node --version

Development

Running Tests

# Test environment setup
node test-env.js

# Test API connection
node test-api.js

# Run server directly
node server.js

Project Structure

mcp-server-claude-llm/
├── server.js           # Main MCP server implementation
├── test-env.js         # Environment testing utility
├── test-api.js         # API connection tester
├── package.json        # Dependencies and scripts
├── .env               # API key configuration (not in git)
├── .gitignore         # Git ignore rules
├── LICENSE            # MIT License
└── README.md          # This file

Contributing

Contributions are welcome! Please feel free to submit a Pull Request. Some ideas for improvements:

• Add support for Claude 3 Haiku model
• Implement streaming responses
• Add configuration for model parameters (temperature, max_tokens)
• Token usage tracking and reporting
• Conversation history management
• Rate limiting for API calls

License

MIT License - see file for details

Acknowledgments

• Built for use with Gemini CLI
• Uses Anthropic's Claude API
• Implements Model Context Protocol (MCP)

Author

Created with ❤️ for the MCP and Gemini CLI community

Note: This is an unofficial integration. Not affiliated with Anthropic or Google.