# Unity-MCP Common
[](https://www.nuget.org/packages/com.IvanMurzak.Unity.MCP.Common/)  [](https://stand-with-ukraine.pp.ua)
Shared source code for [Unity-MCP Plugin](https://github.com/IvanMurzak/Unity-MCP) and [Unity-MCP Server](https://github.com/IvanMurzak/Unity-MCP) projects.
### Topology subjects
- **Client** is the MCP client, such as VS Code, Cursor, Claude Desktop, Claude Code etc.
- **Server** is the MCP server, this is Unity-MCP server implementation which works closely in pair with Unity MCP Plugin
- **Plugin** is the Unity-MCP Plugin, this is deeply connected with Unity Editor and runtime game build SDK, that exposes API for the Server and lets the AI magic to happen.
### Connection chain
**Client** <-> **Server** <-> **Plugin** (Unity Editor / Game)
## Variables
| Environment Variable | Command Line Variable | Description |
|-----------------------------|-----------------------|-----------------------------------------------------------------------------|
| `UNITY_MCP_PORT` | `--port` | **Client** -> **Server** <- **Plugin** connection port (default: 8080) |
| `UNITY_MCP_PLUGIN_TIMEOUT` | `--plugin-timeout` | **Plugin** -> **Server** connection timeout (ms) (default: 10000) |
| `UNITY_MCP_CLIENT_TRANSPORT`| `--client-transport` | **Client** -> **Server** transport type: `stdio` or `http` (default: `http`) |
