LiteLLM Server Bridge

A Model Context Protocol (MCP) server that connects Antigravity to your deployed LiteLLM instance.

Features

This MCP server provides the following tools:

• chat_completion - Generate chat completions using any model in your LiteLLM instance
• completion - Generate text completions using the legacy endpoint
• list_models - List all available models
• health_check - Check LiteLLM instance health status
• create_embedding - Generate embeddings
• model_info - Get detailed information about a specific model
• create_image - Generate images using models available in your instance
• create_speech - Generate speech audio from text (TTS)
• rerank - Rerank documents based on a search query
• key_generate - Generate a new LiteLLM Proxy API key (admin feature)
• key_info - Get details and spend info for a LiteLLM Proxy API key (admin feature)

Setup

1. Configure Antigravity

Add the following to your Antigravity MCP configuration. This will use npx to fetch and run the latest version of the published package on-the-fly.

{
  "mcpServers": {
    "litellm": {
      "command": "npx",
      "args": [
        "-y",
        "litellm-mcp-server@latest"
      ],
      "env": {
        "LITELLM_BASE_URL": "https://your-litellm-url",
        "LITELLM_API_KEY": "your-api-key-here"
      }
    }
  }
}

2. Set Your Secrets

Replace your-litellm-url and your-api-key-here in the configuration with your actual LiteLLM Base URL and API key.

Usage Examples

Once configured, you can use the MCP tools in Antigravity:

Chat Completion

Use the chat_completion tool to generate a response using gpt-4

List Models

Use the list_models tool to see what models are available

Health Check

Use the health_check tool to verify the LiteLLM instance is running

Environment Variables

• LITELLM_BASE_URL - Your LiteLLM instance URL
• LITELLM_API_KEY - Your LiteLLM API key for authentication

Troubleshooting

Server won't start

1. Ensure Node.js is installed: node --version
2. Check dependencies are installed: npm install
3. Verify the script path in your Antigravity config is correct
4. Check that your API key is valid

Connection errors

1. Verify your LiteLLM instance is accessible: curl https://your-litellm-url/health
2. Check your API key has proper permissions
3. Ensure your network allows connections to the LiteLLM instance

Tool not showing up

1. Restart Antigravity after adding the MCP server configuration
2. Check Antigravity logs for any error messages
3. Verify the JSON configuration is valid

Architecture

The MCP server acts as a bridge:

Antigravity ←→ MCP Server (this script) ←→ LiteLLM Instance

All requests from Antigravity are forwarded to your LiteLLM instance with proper authentication headers.

License

MIT