Factorio MCP Server 🏭

A Model Context Protocol (MCP) server for managing Factorio servers using Claude. This repository contains two main components:

1. An HTTP backend that securely wraps RCON commands (backend/server.py)
2. An MCP server that provides a high-level interface for Claude (factorio_mcp.py)

Architecture

flowchart LR
    Claude --> MCP_API --> HTTP_Backend --> Factorio_Server

Backend Server

The backend server provides a secure HTTP interface to Factorio’s RCON, requiring API key authentication. This isolates the RCON password and provides a clean HTTP interface for the MCP server.

Setup

1. Install requirements:

pip install fastapi uvicorn python-dotenv mcrcon

2. Create a .env file:

RCON_HOST=localhost  # Your Factorio server hostname
RCON_PORT=27015     # Your Factorio RCON port
RCON_PASSWORD=xxx   # Your Factorio RCON password
API_KEY=xxx         # Generate a secure API key (only supports one api key, for your MCP server to use)

3. Run the server:

uvicorn backend.server:app --host 0.0.0.0 --port 8000

API Endpoints

• GET / - Health check
• POST /execute_command - Execute RCON command
  • Requires X-API-Key header
  • Body: {"command": "your command"}

MCP Server

The MCP server provides a high-level interface for Claude to interact with Factorio, built using FastMCP.

Features

• Execute arbitrary Lua commands with explanations
• Player management (teleport, give items)
• Server monitoring
• Screenshot capabilities

Setup

1. Install fastmcp:

pip install fastmcp

2. Install the MCP server:

fastmcp install factorio_mcp.py -e API_KEY=your_backend_api_key

Available Tools

• execute_command(command: str) - Execute raw RCON commands
• run_lua(code: str, explanation: str) - Run Lua code with announcements
• get_player_count() - Check online players
• send_message(message: str) - Broadcast to all players
• give_items(player: str, item: str, count: int) - Give items to players
• teleport_player(player: str, x: float, y: float) - Teleport players
• get_player_info(player: str) - Get player details
• take_screenshot(player?: str, resolution?: Dict) - Take screenshots