Content
# Unity MCP ✨
**Connect your Unity Editor to LLMs using the Model Context Protocol.**
Unity MCP acts as a bridge, allowing AI assistants (like Claude, Cursor) to interact directly with your Unity Editor via a local **MCP (Model Context Protocol) Client**. Give your LLM tools to manage assets, control scenes, edit scripts, and automate tasks within Unity.
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## <picture><source media="(prefers-color-scheme: dark)" srcset="https://github.com/justinpbarnett/unity-mcp/assets/11047284/c279675a-dd58-406b-9613-5b16b5c6bb63"><source media="(prefers-color-scheme: light)" srcset="https://github.com/justinpbarnett/unity-mcp/assets/11047284/b54f891d-961b-4048-a9c4-3af46e2a52fc"><img alt="UnityMCP Workflow" width="100%" style="max-width: 600px; display: block; margin-left: auto; margin-right: auto;"></picture>
## Key Features 🚀
* **🗣️ Natural Language Control:** Instruct your LLM to perform Unity tasks.
* **🛠️ Powerful Tools:** Manage assets, scenes, materials, scripts, and editor functions.
* **🤖 Automation:** Automate repetitive Unity workflows.
* **🧩 Extensible:** Designed to work with various MCP Clients.
<details>
<summary><strong>Expand for Available Tools...</strong></summary>
Your LLM can use functions like:
* `read_console`: Gets messages from or clears the console.
* `manage_script`: Manages C# scripts (create, read, update, delete).
* `manage_editor`: Controls and queries the editor's state and settings.
* `manage_scene`: Manages scenes (load, save, create, get hierarchy, etc.).
* `manage_asset`: Performs asset operations (import, create, modify, delete, etc.).
* `manage_gameobject`: Manages GameObjects: create, modify, delete, find, and component operations.
* `execute_menu_item`: Executes a menu item via its path (e.g., "File/Save Project").
</details>
---
## How It Works 🤔
Unity MCP connects your tools using two components:
1. **Unity MCP Bridge:** A Unity package running inside the Editor. (Installed via Package Manager).
2. **Unity MCP Server:** A Python server that runs locally, communicating between the Unity Bridge and your MCP Client. (Installed manually).
**Flow:** `[Your LLM via MCP Client] <-> [Unity MCP Server (Python)] <-> [Unity MCP Bridge (Unity Editor)]`
---
## Installation ⚙️
> **Note:** The setup is constantly improving as we update the package. Check back if you randomly start to run into issues.
### Prerequisites
<details>
<summary><strong>Click to view required software...</strong></summary>
* **Git CLI:** For cloning the server code. [Download Git](https://git-scm.com/downloads)
* **Python:** Version 3.12 or newer. [Download Python](https://www.python.org/downloads/)
* **Unity Hub & Editor:** Version 2020.3 LTS or newer. [Download Unity](https://unity.com/download)
* **uv (Python package manager):**
```bash
pip install uv
# Or see: https://docs.astral.sh/uv/getting-started/installation/
```
* **An MCP Client:**
* [Claude Desktop](https://claude.ai/download)
* [Cursor](https://www.cursor.com/en/downloads)
* *(Others may work with manual config)*
</details>
### Step 1: Install the Unity Package (Bridge)
1. Open your Unity project.
2. Go to `Window > Package Manager`.
3. Click `+` -> `Add package from git URL...`.
4. Enter:
```
https://github.com/justinpbarnett/unity-mcp.git?path=/UnityMcpBridge
```
5. Click `Add`.
6. The MCP Server should automatically be installed onto your machine as a result of this process.
### Step 2: Configure Your MCP Client
Connect your MCP Client (Claude, Cursor, etc.) to the Python server you installed in Step 1.
**Option A: Auto-Configure (Recommended for Claude/Cursor)**
1. In Unity, go to `Window > Unity MCP`.
2. Click `Auto Configure Claude` or `Auto Configure Cursor`.
3. Look for a green status indicator 🟢 and "Connected". *(This attempts to modify the MCP Client's config file automatically)*.
**Option B: Manual Configuration**
If Auto-Configure fails or you use a different client:
1. **Find your MCP Client's configuration file.** (Check client documentation).
* *Claude Example (macOS):* `~/Library/Application Support/Claude/claude_desktop_config.json`
* *Claude Example (Windows):* `%APPDATA%\Claude\claude_desktop_config.json`
2. **Edit the file** to add/update the `mcpServers` section, using the *exact* paths from Step 1.
<details>
<summary><strong>Click for OS-Specific JSON Configuration Snippets...</strong></summary>
**Windows:**
```json
{
"mcpServers": {
"UnityMCP": {
"command": "uv",
"args": [
"run",
"--directory",
"C:\\Users\\YOUR_USERNAME\\AppData\\Local\\Programs\\UnityMCP\\UnityMcpServer\\src",
"server.py"
]
}
// ... other servers might be here ...
}
}
```
(Remember to replace YOUR_USERNAME and use double backslashes \\)
**macOS:**
```json
{
"mcpServers": {
"UnityMCP": {
"command": "uv",
"args": [
"run",
"--directory",
"/usr/local/bin/UnityMCP/UnityMcpServer/src",
"server.py"
]
}
// ... other servers might be here ...
}
}
```
(Replace YOUR_USERNAME if using ~/bin)
**Linux:**
```json
{
"mcpServers": {
"UnityMCP": {
"command": "uv",
"args": [
"run",
"--directory",
"/home/YOUR_USERNAME/bin/UnityMCP/UnityMcpServer/src",
"server.py"
]
}
// ... other servers might be here ...
}
}
```
(Replace YOUR_USERNAME)
</details>
---
## Usage ▶️
1. **Open your Unity Project.** The Unity MCP Bridge (package) should connect automatically. Check status via Window > Unity MCP.
2. **Start your MCP Client** (Claude, Cursor, etc.). It should automatically launch the Unity MCP Server (Python) using the configuration from Installation Step 3.
3. **Interact!** Unity tools should now be available in your MCP Client.
Example Prompt: `Create a 3D player controller.`
---
## Contributing 🤝
Help make Unity MCP better!
1. **Fork** the main repository.
2. **Create a branch** (`feature/your-idea` or `bugfix/your-fix`).
3. **Make changes.**
4. **Commit** (feat: Add cool new feature).
5. **Push** your branch.
6. **Open a Pull Request** against the master branch.
---
## Troubleshooting ❓
<details>
<summary><strong>Click to view common issues and fixes...</strong></summary>
- **Unity Bridge Not Running/Connecting:**
- Ensure Unity Editor is open.
- Check the status window: Window > Unity MCP.
- Restart Unity.
- **MCP Client Not Connecting / Server Not Starting:**
- **Verify Server Path:** Double-check the --directory path in your MCP Client's JSON config. It must exactly match the location where you cloned the UnityMCP repository in Installation Step 1 (e.g., .../Programs/UnityMCP/UnityMcpServer/src).
- **Verify uv:** Make sure uv is installed and working (pip show uv).
- **Run Manually:** Try running the server directly from the terminal to see errors: `# Navigate to the src directory first! cd /path/to/your/UnityMCP/UnityMcpServer/src uv run server.py`
- **Permissions (macOS/Linux):** If you installed the server in a system location like /usr/local/bin, ensure the user running the MCP client has permission to execute uv and access files there. Installing in ~/bin might be easier.
- **Auto-Configure Failed:**
- Use the Manual Configuration steps. Auto-configure might lack permissions to write to the MCP client's config file.
</details>
Still stuck? [Open an Issue](https://www.google.com/url?sa=E&q=https%3A%2F%2Fgithub.com%2Fjustinpbarnett%2Funity-mcp%2Fissues).
---
## License 📜
MIT License. See [LICENSE](https://www.google.com/url?sa=E&q=https%3A%2F%2Fgithub.com%2Fjustinpbarnett%2Funity-mcp%2Fblob%2Fmaster%2FLICENSE) file.
---
## Contact 👋
- **X/Twitter:** [@justinpbarnett](https://www.google.com/url?sa=E&q=https%3A%2F%2Fx.com%2Fjustinpbarnett)
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## Acknowledgments 🙏
Thanks to the contributors and the Unity team.
