Unity MCP server for AI agents

The Unity MCP Server is a powerful tool that connects Large Language Models (LLMs) like Claude or GPT to your Unity projects, enabling AI-assisted game development through natural language commands. This server implements the Model Context Protocol (MCP) to provide a standardized interface between AI models and Unity.

Installation Options

There are two main ways to use the Unity MCP Server:

Using Docker

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

For STDIO transport (recommended for local development):

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 pre-compiled binary for your system architecture from the GitHub Release Page.

Run the server with:

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

Configuration Options

The server supports configuration through either 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	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 your server, you'll need to configure your MCP client (like Claude Code, Claude Desktop, or GitHub Copilot) to connect to it.

For HTTP transport:

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

For STDIO transport:

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

Using with Claude Code (Recommended)

For Windows:

claude mcp add Unity-MCP "<unityProjectPath>/Library/mcp-server/win-x64/unity-mcp-server.exe" client-transport=stdio

For macOS (Apple Silicon):

claude mcp add Unity-MCP "<unityProjectPath>/Library/mcp-server/osx-arm64/unity-mcp-server" client-transport=stdio

For macOS (Intel):

claude mcp add Unity-MCP "<unityProjectPath>/Library/mcp-server/osx-x64/unity-mcp-server" client-transport=stdio

For Linux (x64):

claude mcp add Unity-MCP "<unityProjectPath>/Library/mcp-server/linux-x64/unity-mcp-server" client-transport=stdio

Usage Examples

Once connected, you can interact with your Unity project through natural language commands in your MCP client:

Create 3 cubes in a circle with radius 2

Explain my scene hierarchy

Create metallic golden material and attach it to a sphere gameObject

Advanced Features

The Unity MCP Server provides powerful capabilities to LLMs:

Full access to Unity's API
Object reference handling
Code compilation using Roslyn
Asset creation and modification
Method discovery and execution across your codebase
Reading and writing to C# scripts
Intelligent feedback with detailed error information

By setting up the Unity MCP Server properly, you can enable AI assistants to help with many aspects of your Unity development workflow.

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