🍃 Embabel Framework: MongoDB MCP Server

This repository demonstrates how to build a MongoDB MCP Server using the Embabel Framework and Spring Boot. The application acts as a bridge between AI agents (like Claude Desktop) and your MongoDB Database, allowing the AI to list databases, run complex queries, and insert documents through natural language.

⚠️ Note: This is not an official MongoDB MCP server. It is a demo MCP server created specifically to demonstrate how developers can build their own MCP servers that interact with databases using the Embabel Framework.

📖 Complete Guide: For detailed explanations and a full code walkthrough, read our comprehensive tutorial. 👉 Build MongoDB MCP Server Using Embabel Framework

🎥 Video Tutorial: Prefer hands-on learning? Watch our step-by-step implementation guide. 👉 YouTube Tutorial - Build a MongoDB MCP Server Using Embabel Framework | Chat With Your Database using AI

✨ What This Project Demonstrates

This application showcases how to connect AI agents to a Database using the MCP Server:

• Model Context Protocol (MCP) implementation using Embabel framework.
• Database Integration connecting an AI agent to MongoDB.
• Tool Exposure using Embabel's @Export annotation to turn Java service methods into AI tools.
• Data Operations including listing databases/collections, executing simple & complex JSON queries, managing indexes, and inserting documents.

📋 Prerequisites

Before running this application, ensure you have:

• Java 21 or higher
• OpenRouter API Key (free tier available at OpenRouter.ai)
• MongoDB Instance (Running locally on port 27017 or via MongoDB Atlas)
• Node.js (Optional, required if testing with MCP Inspector)
• Claude Desktop App (Optional, for real-world agent testing)

🚀 Quick Start

1️⃣ Clone the Repository

git clone https://github.com/BootcampToProd/embabel-mongo-mcp-server.git
cd embabel-mongo-mcp-server

2️⃣ Configure Environment Variables

Provide your OpenRouter API key and MongoDB connection details.

OPENAI_API_KEY={YOUR_OPENROUTER_API_KEY}
MONGO_HOST=localhost
MONGO_PORT=27017

3️⃣ Build the Project

mvn clean install

4️⃣ Run the Application

mvn spring-boot:run

The server will start on http://localhost:8080. The MCP endpoint is exposed at /sse.

💡 How to Test

You can test the server using Claude Desktop or the MCP Inspector.

🤖 Option 1: Claude Desktop (Recommended)

1. Open your Claude Desktop configuration file:

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

2. Add the following configuration:

{
  "mcpServers": {
    "embabel-mongo-server": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "http://localhost:8080/sse"
      ]
    }
  }
}

1. Restart Claude Desktop. You should see your mcp server and available tools.

2. Ask Claude:

   • "List all databases."
   • "Create a collection named 'users' in 'test_db'."
   • "Insert a user named Alice with age 28 into 'test_db.users'."
   • "Find all users in 'test_db.users' where age is greater than 25."

🔍 Option 2: MCP Inspector

If you want to debug the tools manually:

1. Ensure the Spring Boot app is running.
2. Run the inspector in your terminal:

   npx @modelcontextprotocol/inspector
   

3. In the browser window that opens:
   • Select SSE.
   • Enter URL: http://localhost:8080/sse.
   • Click Connect and test the tools via the UI.