Gemini RAG MCP Server

A Model Context Protocol (MCP) server that provides RAG (Retrieval-Augmented Generation) capabilities using Google's Gemini API File Search feature. This server enables AI applications to create knowledge bases and retrieve information from uploaded documents.

Features

• File Search RAG: Create and manage knowledge bases using Gemini's File Search API
• Document Upload: Upload files and text content to create searchable knowledge bases
• Information Retrieval: Query knowledge bases to retrieve relevant information
• Configurable Models: Choose Gemini models via environment variable
• MCP Protocol: Full compatibility with Model Context Protocol
• Type-Safe: Full TypeScript support with strict mode enabled
• Dual Transport Support: stdio (default) and HTTP transports
• Production-Ready: Logging, error handling, and configuration management

Prerequisites

• Node.js >= 22.10.0
• pnpm >= 10.19.0
• Google API Key with Gemini API access

Installation

Using with Claude Desktop (Recommended)

Add the following to your Claude Desktop configuration file:

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

{
  "mcpServers": {
    "gemini-rag-mcp": {
      "command": "npx",
      "args": ["-y", "@r_masseater/gemini-rag-mcp"],
      "env": {
        "GOOGLE_API_KEY": "your_google_api_key_here",
        "STORE_DISPLAY_NAME": "your_store_name"
      }
    }
  }
}

Required Environment Variables:

• GOOGLE_API_KEY: Your Google API key with Gemini API access
• STORE_DISPLAY_NAME: Display name for your vector store/knowledge base

Optional Environment Variables:

• GEMINI_MODEL: Gemini model to use for queries (default: gemini-2.5-pro)
  • Options: gemini-2.5-pro, gemini-2.5-flash

After configuration, restart Claude Desktop to load the server.

Development

1. Clone the repository

git clone https://github.com/masseater/gemini-rag-mcp.git
cd gemini-rag-mcp

2. Install dependencies

pnpm install

3. Run in development mode

# stdio transport (default)
pnpm run dev

# HTTP transport (with hot reload)
pnpm run dev:http

Environment Variables

Required:

• GOOGLE_API_KEY: Google API key with Gemini API access
• STORE_DISPLAY_NAME: Display name for vector store/knowledge base

Optional:

• GEMINI_MODEL: Gemini model for queries (default: gemini-2.5-pro)
• LOG_LEVEL: Logging level (error|warn|info|debug, default: info)
• DEBUG: Enable debug console output (true|false, default: false)
• PORT: HTTP server port (default: 3000)

Available Tools

Once configured with Claude Desktop, the following tools are available:

• upload_file: Upload document files to the knowledge base
• upload_content: Upload text content directly to the knowledge base
• query: Query the knowledge base using RAG

Resources

• Model Context Protocol Documentation
• Gemini API Documentation

License

MIT License