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 Launcher
2. Node.js 18 or higher
3. Claude Desktop App
4. Java 21.0.5 (recommended)

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

Important Note

1. Use the F3+P Shortcut: Press F3 + P together. This toggles the "Pause on Lost Focus" feature. Once turned off, you can switch to claude desktop and Minecraft will continue running without pausing.

2. Connection Issues on Claude Restart: If you restart Claude while the Minecraft server is running, you may experience MCP connection issues on the next claude launch due to lingering java process. See Troubleshooting: MCP Connection Failed for resolution steps.

Installation Steps

1. Download and Setup Minecraft Server

   • Download Minecraft server v1.21 from mcversions.net/1.21
   • Install Java 21.0.5 if not already installed (other versions are untested)
   • 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. Install and Configure MCP Integration

   Quick Install (Recommended):

   npx -y @smithery/cli install mcp-minecraft --client claude
   

   Follow the CLI prompts to complete the setup.

   Or Manual Setup:

   • 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

   • Open Minecraft Launcher
   • Install and launch Minecraft Java Edition v1.21
   • Click "Play" and 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. MCP Connection Failed

   • Look for lingering Java processes
   • Terminate them manually:
     • Windows: Use Task Manager (untested)
     • Mac/Linux:
       • Go to 'Activity Monitor' and 'Force Quit' java
   • Restart computer if process termination fails
   • Note: Latest version should auto-resolve these issues

2. Server Won't Start

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

3. Can't Connect to Server

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

Logs Location

• Minecraft 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.