Unity MCP server

Unity MCP Server is a powerful interface that connects large language models (LLMs) with Unity, allowing AI to assist with game development tasks. This server acts as a bridge between MCP Clients (like Claude, GitHub Copilot, etc.) and Unity, enabling AI-powered development assistance through natural language conversations.

Installation

The Unity MCP Server can be run in several ways, with Docker being the simplest option for most users.

Using Docker

Docker provides the easiest way to run the MCP server:

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

For STDIO transport (where the MCP client launches the server):

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

If you need to use a custom port:

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

Using Binary Executables

You can also run the server directly using pre-compiled binaries specific to your CPU architecture:

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

Configuration Options

The server supports various configuration options through environment variables or command-line arguments:

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

MCP Client Configuration

After setting up the server, you'll need to configure your MCP client to connect to it. For HTTP transport, use this configuration:

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

For STDIO transport, where the client launches the server:

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

Command Line Configuration Examples

Different MCP clients might require specific command-line configuration. Replace <unityProjectPath> with your actual project path and <port> with your desired port number:

For Gemini:

gemini mcp add ai-game-developer "<unityProjectPath>/Library/mcp-server/win-x64/unity-mcp-server.exe" port=<port> client-transport=stdio

For Claude Code:

claude mcp add ai-game-developer "<unityProjectPath>/Library/mcp-server/win-x64/unity-mcp-server.exe" port=<port> client-transport=stdio

For GitHub Copilot CLI, use the interactive commands:

/mcp add

Then input:

• Server name: ai-game-developer
• Server type: local
• Command: <unityProjectPath>/Library/mcp-server/win-x64/unity-mcp-server.exe port=<port> client-transport=stdio

Usage

Once configured, you can use natural language to interact with Unity through your MCP client. Examples include:

• "Explain my scene hierarchy"
• "Create 3 cubes in a circle with radius 2"
• "Create metallic golden material and attach it to a sphere gameObject"

Make sure the "Agent" mode is enabled in your MCP client for the best experience.

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