Minecraft-MCP-Server

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

🔧 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)

📦 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

⚙️ 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

📝 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

🚀 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][1], [reddit.com][2], [github.com][3])

💬 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.

⚙️ 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.

🧪 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())

🧰 How It Works

• 🎯 `FastMCP` automatically loads tools and resources ([medium.com][4], [github.com][5])
• Resource `minecraft://commands` provides the commands dictionary
• Tool `run_minecraft_command` uses `mcrcon` to send commands to Minecraft

📚 References

• [FastMCP v2 – Sample README] ([pypi.org][6])
• [mcrcon – Python RCON client] ([pypi.org][6])

🛠 Next Steps

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

Ready to make your server smart! 🚀

[1]: https://apidog.com/blog/fastmcp/?utm_source=chatgpt.com "A Beginner's Guide to Use FastMCP - Apidog"

[2]: https://www.reddit.com/r/mcp/comments/1hrq0au/how_to_build_mcp_servers_with_fastmcp_stepbystep/?utm_source=chatgpt.com

[3]: https://github.com/GanonUchiha/My-FastMCP-Example?utm_source=chatgpt.com

[4]: https://medium.com/data-engineering-with-dremio/building-a-basic-mcp-server-with-python-4c34c41031ed?utm_source=chatgpt.com

[5]: https://github.com/jlowin/fastmcp?utm_source=chatgpt.com

[6]: https://pypi.org/project/mcrcon/?utm_source=chatgpt.com