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MIT License
Copyright (c) 2025 Justin P Barnett
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# Unity Model Context Protocol (MCP) Server
# Unity MCP Package
A bridge between Python and Unity that allows for programmatic control of the Unity Editor through Python scripts.
A Unity package that enables seamless communication between Unity and Large Language Models (LLMs) like Claude Desktop via the **Model Context Protocol (MCP)**. This server acts as a bridge, allowing Unity to send commands to and receive responses from MCP-compliant tools, empowering developers to automate workflows, manipulate assets, and control the Unity Editor programmatically.
Welcome to the initial release of this open-source project! Whether you're looking to integrate LLMs into your Unity workflow or contribute to an exciting new tool, we’re thrilled to have you here.
## Overview
The Unity MCP Server provides a bidirectional communication channel between Python and the Unity Editor, enabling:
The Unity MCP Server provides a bidirectional communication channel between Unity (via C#) and a Python server, enabling:
- Creation and manipulation of Unity assets
- Scene management and object manipulation
- Material and script editing
- Editor control and automation
- **Asset Management**: Create, import, and manipulate Unity assets programmatically.
- **Scene Control**: Manage scenes, objects, and their properties.
- **Material Editing**: Modify materials and their properties.
- **Script Integration**: View, create, and update Unity scripts.
- **Editor Automation**: Control Unity Editor functions like undo, redo, play, and build.
This system is designed to make Unity Editor operations programmable through Python, allowing for more complex automation workflows and integrations.
## Structure
- **Editor/**: C# implementation of Unity-side command handlers
- **Commands/**: Command handlers organized by functionality
- **Models/**: Data models and contract definitions
- **Helpers/**: Utility classes for common operations
- **MCPServerWindow.cs**: Unity Editor window for controlling the MCP Server
- **UnityMCPBridge.cs**: Core communication bridge implementation
- **Python/**: Python server implementation
- **tools/**: Python tool implementations that map to Unity commands
- **server.py**: FastAPI server implementation
- **unity_connection.py**: Communication layer for Unity connection
This project is perfect for developers who want to leverage LLMs to enhance their Unity projects or automate repetitive tasks.
## Installation
1. Import this package into your Unity project
2. Install Python requirements:
```bash
cd Assets/MCPServer/Python
pip install -e .
```
Getting started is simple! Follow these steps to add the Unity MCP Server to your project:
### Unity Package
1. **Download the Package**
Add via the Unity package manager using this link
```text
https://github.com/justinpbarnett/unity-mcp.git
```
2. **Add to Unity**
- Open Unity and navigate to `Window > Package Manager`.
- Click the `+` button and select `Add package from disk...`.
- Locate the downloaded package and select the `package.json` file.
### Python Environment
1. **Prerequisites**
Ensure you have:
- **Python** (version 3.7 or higher) installed. Download it from [python.org](https://www.python.org/downloads/).
- **`uv`** installed for managing Python dependencies. Install it via:
```bash
pip install uv
```
2. **Set Up the Python Server**
- Navigate to the `Python` directory within the package (e.g., `Assets/MCPServer/Python`).
- Create a virtual environment and install dependencies:
```bash
uv venv
uv pip install -e .
```
## Configuration
To connect the MCP Server to tools like Claude Desktop or Cursor:
1. **Open the Unity MCP Window**
In Unity, go to `Window > Unity MCP` to open the editor window.
2. **Configure Your Tools**
- In the Unity MCP window, you’ll see buttons to configure **Claude Desktop** or **Cursor**.
- Click the appropriate button and follow the on-screen instructions to set up the integration.
3. **Verify Server Status**
- Check the server status in the Unity MCP window. It will display:
- **Unity Bridge**: Should show "Running" when active.
- **Python Server**: Should show "Connected" (green) when successfully linked.
## Usage
1. Set up MCP integration in Unity:
- Open Window > Unity MCP
- Click the configuration button to set up integration with MCP clients like Claude Desktop or Cursor
Once configured, you can use the MCP Server to interact with LLMs directly from Unity or Python. Here are a couple of examples:
2. The Unity Bridge will start automatically when the Unity Editor launches, and the Python server will be started by the MCP client when needed.
### Creating a Cube in the Scene
3. Use Python tools to control Unity through the MCP client:
```python
# Example: Create a new cube in the scene
create_primitive(primitive_type="Cube", position=[0, 0, 0])
# Example: Change material color
set_material_color(material_name="MyMaterial", color=[1, 0, 0, 1])
```
## Adding New Tools
See [HOW_TO_ADD_A_TOOL.md](HOW_TO_ADD_A_TOOL.md) for detailed instructions on extending the MCP Server with your own tools.
## Best Practices
- Always validate parameters on both Python and C# sides
- Use try-catch blocks for error handling in both environments
- Follow the established naming conventions (UPPER_SNAKE_CASE for commands, snake_case for Python tools)
- Group related functionality in appropriate tool modules and command handlers
## Testing
Run Python tests with:
```bash
python -m unittest discover Assets/MCPServer/Python/tests
```python
# Send a command to create a cube at position (0, 0, 0)
create_primitive(primitive_type="Cube", position=[0, 0, 0])
```
### Changing a Material’s Color
```python
# Set a material’s color to red (RGBA: 1, 0, 0, 1)
set_material_color(material_name="MyMaterial", color=[1, 0, 0, 1])
```
Explore more commands in the [HOW_TO_ADD_A_TOOL.md](HOW_TO_ADD_A_TOOL.md) file for detailed examples and instructions on extending functionality.
## Features
- **Bidirectional Communication**: Seamlessly send and receive data between Unity and LLMs.
- **Asset Management**: Import assets, instantiate prefabs, and create new prefabs programmatically.
- **Scene Control**: Open, save, and modify scenes, plus create and manipulate game objects.
- **Material Editing**: Apply and modify materials with ease.
- **Script Integration**: Create, view, and update C# scripts within Unity.
- **Editor Automation**: Automate Unity Editor tasks like building projects or entering play mode.
## Contributing
We’d love your help to make the Unity MCP Server even better! Here’s how to contribute:
1. **Fork the Repository**
Fork [github.com/justinpbarnett/unity-mcp](https://github.com/justinpbarnett/unity-mcp) to your GitHub account.
2. **Create a Branch**
```bash
git checkout -b feature/your-feature-name
```
3. **Make Changes**
Implement your feature or fix, following the project’s coding standards (see [HOW_TO_ADD_A_TOOL.md](HOW_TO_ADD_A_TOOL.md) for guidance).
4. **Commit and Push**
Use clear, descriptive commit messages:
```bash
git commit -m "Add feature: your feature description"
git push origin feature/your-feature-name
```
5. **Submit a Pull Request**
Open a pull request to the `master` branch. Include a description of your changes and any relevant details.
For more details, check out [CONTRIBUTING.md](CONTRIBUTING.md) (to be created).
## License
This project is licensed under the **MIT License**. Feel free to use, modify, and distribute it as you see fit. See the full license [here](https://github.com/justinpbarnett/unity-mcp/blob/master/LICENSE).
## Troubleshooting
- Check Unity Console for C# errors
- Verify your MCP client (Claude Desktop, Cursor) is properly configured
- Check the MCP integration status in Window > Unity MCP
- Check network connectivity between Unity and the MCP client
- Ensure commands are properly registered in CommandRegistry.cs
- Verify Python tools are properly imported and registered
Encountering issues? Here are some common fixes:
- **Unity Bridge Not Running**
Ensure the Unity Editor is open and the MCP window is active. Restart Unity if needed.
- **Python Server Not Connected**
- Verify the Python server is running (`python server.py` in the `Python` directory).
- Check `config.json` (in `Assets/MCPServer`) for correct port settings (default: `unity_port: 6400`, `mcp_port: 6500`).
- Ensure `uv` and dependencies are installed correctly.
- **Configuration Issues with Claude Desktop or Cursor**
Confirm the paths and settings in the configuration dialog match your tool’s installation.
For additional help, check the [issue tracker](https://github.com/justinpbarnett/unity-mcp/issues) or file a new issue.
## Contact
Have questions or want to chat about the project? Reach out!
- **X**: [@justinpbarnett](https://x.com/justinpbarnett)
- **GitHub**: [justinpbarnett](https://github.com/justinpbarnett)
- **Discord**: Join our community (link coming soon!).
## Acknowledgments
A huge thanks to everyone who’s supported this project’s initial release. Special shoutout to Unity Technologies for inspiring tools that push creative boundaries, and to the open-source community for making projects like this possible.
Happy coding, and enjoy integrating LLMs with Unity!