Minecraft-MCP-Server

Python MCP Server to control a Minecraft server via RCON, using FastMCP.

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🔧 Features

• Exposes a set of commands (dictionary) to contextualize the LLM
• Executes commands on the Minecraft server via RCON
• Integration with Claude Desktop or any MCP client
• Simple structure: stdio (local development) or HTTP/SSE (production)

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📦 Project Structure

mcp_server/
├── __pycache__/
├── .env                   # Environment variables for Gemini and paths
├── commands.json          # Commands dictionary and examples  
├── mcp_chat_client.py     # NEW: Client that listens to @ai messages from chat
├── server.py              # Main MCP server  
├── .gitattributes
├── .gitignore
├── readme.md
└── requirements.txt

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⚙️ Installation

1. Clone the repository:

cd Minecraft-MCP-Server/mcp_server  

2. Create an environment and install dependencies:

python -m venv venv  
venv\Scripts\activate  
pip install -r requirements.txt  

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📝 Setup

In the commands.json file, you will have a list of commands like /give, /weather, /gamemode, etc., with descriptions and examples.

Don’t forget to enable RCON in the Minecraft server.properties file:

enable-rcon=true
rcon.password=minemcp
rcon.port=25575

Create a .env file like this:

MINECRAFT_LOG_PATH=C:\Users\YourUser\Desktop\mineserver\logs\latest.log
MCP_SERVER_PATH=mcp_server/server.py
GEMINI_API_KEY=your_gemini_api_key

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🚀 Running the MCP Server

Activate the virtual environment and run:

venv\Scripts\activate
python mcp_server/server.py

Monkey patch: starts MCP server in STDIO by default (apidog.com, reddit.com, github.com)

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💬 Running the Chat Client (@ai)

After starting the server, in a new terminal, run the chat client:

venv\Scripts\activate
python mcp_server/mcp_chat_client.py

This script monitors the Minecraft server log and listens for player chat messages that start with @ai. It sends the message to the Gemini API and executes the resulting command on the server via MCP.

⚠️ Important: The server must be started before running the client.
Current version has a known memory overflow bug if the client starts before the server.

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⚙️ Integration with Claude Desktop

In claude_desktop_config.json (e.g., %APPDATA%\Claude\):

{
  "mcpServers": {
    "minecraft-controller": {
      "type": "stdio",
      "command": "/home/qkeq/Documentos/GitHub/Minecraft-MCP-Server/venv/bin/python3",
      "args": ["C:\\...\\mcp_server\\server.py"],
      "env": {"PATH": "%PATH%"}
    }
  }
}

Then restart Claude — the ‘minecraft-controller’ server will appear.

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🧪 Local Test with Python

from fastmcp import Client
import asyncio

async def test():
    client = Client("mcp_server/server.py")
    async with client:
        res = await client.call_tool("run_minecraft_command", {"command": "/list"})
        print("Players:", res)
        cmds = await client.read_resource("minecraft://commands")
        print("Commands:", list(cmds.keys())[:5])

asyncio.run(test())

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🧰 How It Works

• 🎯 FastMCP automatically loads tools and resources (medium.com, github.com)
• Resource minecraft://commands provides the commands dictionary
• Tool run_minecraft_command uses mcrcon to send commands to Minecraft

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📚 References

• [FastMCP v2 – Sample README] (pypi.org)
• [mcrcon – Python RCON client] (pypi.org)

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🛠 Next Steps

• Support for HTTP/SSE transport with Docker
• Argument validation/autocomplete via commands dictionary
• Logging extra actions: /start, /stop, /backup, /whitelist

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Ready to make your server smart! 🚀