Unity MCP server

The Unity MCP Server acts as a bridge between Large Language Models (LLMs) and Unity, allowing AI assistance in game development through simple chat interactions. It follows the Model Context Protocol (MCP) to enable LLMs to interact with Unity's tools and features.

Installation

To set up the Unity MCP Server, you need to follow these steps:

Step 1: Install the MCP Server

The MCP server can be run using Docker or as a binary executable:

Using Docker

docker run -p 8080:8080 ivanmurzakdev/unity-mcp-server

For STDIO transport mode:

docker run -t -e UNITY_MCP_CLIENT_TRANSPORT=stdio -p 8080:8080 ivanmurzakdev/unity-mcp-server

To use a custom port:

docker run -e UNITY_MCP_PORT=123 -p 123:123 ivanmurzakdev/unity-mcp-server

Using Binary Executable

Download the appropriate binary for your platform from the GitHub Releases page and run:

./unity-mcp-server --port 8080 --plugin-timeout 10000 --client-transport stdio

Step 2: Install an MCP Client

Choose one of the following MCP clients to communicate with the MCP server:

• Claude Code (highly recommended)
• Claude Desktop
• GitHub Copilot in VS Code
• Cursor
• Windsurf
• Any other MCP-compatible client

Step 3: Configure the MCP Client

Configure your MCP client to connect to the MCP server using the appropriate settings:

For HTTP transport:

{
  "mcpServers": {
    "Unity-MCP": {
      "url": "http://localhost:8080"
    }
  }
}

For STDIO transport with Docker:

{
  "mcpServers": {
    "Unity-MCP": {
      "command": "docker",
      "args": [
        "run",
        "-t",
        "-e",
        "UNITY_MCP_CLIENT_TRANSPORT=stdio",
        "-p",
        "8080:8080",
        "ivanmurzakdev/unity-mcp-server"
      ]
    }
  }
}

Configuration Options

The MCP server supports the following configuration options through environment variables or command-line arguments:

Environment Variable	Command Line Args	Description
UNITY_MCP_PORT	--port	Client to Server to Plugin connection port (default: 8080)
UNITY_MCP_PLUGIN_TIMEOUT	--plugin-timeout	Plugin to Server connection timeout in ms (default: 10000)
UNITY_MCP_CLIENT_TRANSPORT	--client-transport	Client to Server transport type: stdio or http (default: http)

Usage

Once the MCP server is running and connected to your MCP client, you can interact with it by typing natural language requests in the chat interface. The LLM will interpret your requests and execute the appropriate Unity operations through the MCP protocol.

Example commands:

Explain my scene hierarchy

Create 3 cubes in a circle with radius 2

Create metallic golden material and attach it to a sphere gameObject

Runtime Usage

You can also use the Unity MCP in runtime (in-game) to enable AI features in your applications. To use it at runtime:

// Initialize the Unity MCP Plugin
UnityMcpPlugin.BuildAndStart();

// Connect to the MCP Server
UnityMcpPlugin.Connect();

// Disconnect when done
UnityMcpPlugin.Disconnect();

This allows you to create AI-powered features in your games, such as AI opponents or assistants that can respond dynamically to player actions.

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "unity-mcp" '{"command":"dotnet","args":["run","--project","path/to/unity-mcp"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "unity-mcp": {
            "command": "dotnet",
            "args": [
                "run",
                "--project",
                "path/to/unity-mcp"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "unity-mcp": {
            "command": "dotnet",
            "args": [
                "run",
                "--project",
                "path/to/unity-mcp"
            ]
        }
    }
}

3. Restart Claude Desktop for the changes to take effect