Minecraft MCP Integration

A Model Context Protocol (MCP) integration for Minecraft that enables AI assistants to interact with a Minecraft server. This integration allows AI models to observe and interact with the Minecraft world through a bot.

Prerequisites

1. Minecraft Java Edition v1.21
2. Node.js 18 or higher
3. Claude Desktop App

⚠️ Note: Currently only tested on macOS/Linux. Windows compatibility is not guaranteed.

Installation Steps

1. Download and Setup Minecraft Server

   • Download Minecraft server v1.21 from minecraft.net/download/server
   • Create a dedicated directory (e.g., ~/minecraft-server/)
   • Place the downloaded server.jar file in this directory
   • Note down the absolute path to your server.jar file

2. Configure Claude Desktop

   • Install Claude Desktop
   • Navigate to ~/Library/Application Support/Claude/claude_desktop_config.json
   • Add the MCP server configuration:

   {
     "mcpServers": {
       "mcp-minecraft": {
         "command": "npx",
         "args": [
           "-y",
           "mcp-minecraft@latest",
           "--server-jar",
           "/absolute/path/to/minecraft-server/server.jar"
         ]
       }
     }
   }   

   ⚠️ Replace /absolute/path/to/minecraft-server/server.jar with your actual server.jar path

3. Launch Claude Desktop

   • Start Claude Desktop after completing the configuration

4. Connect to Server

   • Launch Minecraft Java Edition
   • Select "Multiplayer"
   • Click "Add Server"
   • Enter server details:
     • Server Name: Minecraft Server
     • Server Address: localhost:25565
   • Click "Done"

Features

Resources

The integration exposes these MCP resources:

• minecraft://bot/location - Current bot position in the world
• minecraft://bot/status - Bot connection status

Tools

Available MCP tools:

• chat - Send chat messages to the server
• jump - Make the bot jump
• moveForward - Make the bot move forward
• moveBack - Make the bot move backward
• turnLeft - Make the bot turn left
• turnRight - Make the bot turn right
• placeBlock - Place a block at specified coordinates
• digBlock - Break a block at specified coordinates
• getBlockInfo - Get information about a block at specified coordinates
• selectSlot - Select a hotbar slot (0-8)
• getInventory - Get contents of bot's inventory
• equipItem - Equip an item by name to specified destination
• getStatus - Get bot's current status (health, food, position, etc.)
• getNearbyEntities - Get list of nearby entities within range
• attack - Attack a nearby entity by name
• useItem - Use/activate the currently held item
• stopUsingItem - Stop using/deactivate the current item
• lookAt - Make the bot look at specific coordinates
• followPlayer - Follow a specific player
• stopFollowing - Stop following current target
• goToPosition - Navigate to specific coordinates

Technical Details

• Server runs in offline mode for local development
• Default memory allocation: 2GB
• Default port: 25565
• Bot username: MCPBot

Troubleshooting

Common Issues

1. Server Won't Start

   • Verify Java is installed
   • Check server.jar path is correct
   • Ensure port 25565 is available

2. Can't Connect to Server

   • Verify server is running (check logs)
   • Confirm you're using "localhost" as server address
   • Check firewall settings

3. MCP Connection Failed

   • Restart Claude Desktop
   • Verify config.json syntax
   • Check server.jar path is absolute

4. Java Process Persists After Closing

   • If you experience issues reconnecting after closing Claude, check for lingering Java processes
   • You may need to manually terminate the Java process:
     • Windows: Use Task Manager (untested)
     • Mac/Linux: Use ps aux | grep java and kill <PID>
   • If process termination doesn't work, restart your computer
   • This issue should auto-resolve in most cases with the latest version

Logs Location

• Server logs: Check the minecraft-server directory
• Claude Desktop logs: ~/Library/Logs/Claude/mcp*.log

Contributing

Contributions, big or small, are welcome!

License

This project is licensed under the MIT License - see the LICENSE file for details.