Union - Unity MCP Server

[!IMPORTANT] Union is deprecated. UseUnity's official MCP server.

📅Always Current: Kept up-to-date with the latest MCP protocol version — currently2025-06-18via theOfficial MCP C# SDK.

{ "mcpServers": { "unity": { "command": "npx", "args": ["-y", "@nurture-tech/unity-mcp-runner", "-unityPath", "<path to unity editor>", "-projectPath", "<path to unity project>"] } } }

This will automatically install theis.nurture.mcppackage in your unity project. Feel free to commit those changes to source control.

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The Google External Dependency Manager (EDMU) causes Unity to hang forever on startup when launched via Cursor on Windows. This is under investigation.

Thetest_active_scenetool sometimes fails with the error messageMaximum call stack size exceeded.

Thesearchtool occasionally fails with the error messageSearch index is not ready yet. Please try again later.
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Create a static class to hold your tools. Add the[McpServerToolType]annotation to the class.

Declare static methods to implement each tool. Add the[McpServerTool]annotation to each method.

Reference theServicesdirectory for examples.

{ "mcpServers": { "unity": { "command": "npx", "args": [ "-y", "@nurture-tech/unity-mcp-runner" "-unityPath", "<path to unity editor>", "-projectPath", ".", "--", "-batchmode", "-nographics" ] } } }

⚠️Important: Do not use the-logFilecommand-line argument. The MCP server relies on Unity's standard output for communication.

🖥️Split screen for vision: For tools likescreenshot, ensure the Unity editor is visible on your screen otherwise it will end up screenshotting the foreground window.

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