How to install Unity Open MCP in Gemini CLI

Gemini CLI was replaced by Antigravity CLI in June 2026. On an enterprise licence or paid API key you can still install Unity Open MCP by running "gemini mcp add unity-open-mcp npx -y unity-open-mcp", then type /mcp to check it.

Built from the published package · server updated 11 days ago

Run the install command

In a terminal, run:

gemini mcp add unity-open-mcp npx -y unity-open-mcp

2
Check it
Inside Gemini CLI, type /mcp to list servers and tools.

MCP servers run with your permissions. If Unity Open MCP needs an API key, add it under env in the config. Check its README.

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Questions

Does Unity Open MCP work in Gemini CLI?

Yes. Gemini CLI supports local and remote mcp servers, extensions (legacy), and Unity Open MCP installs with the steps above.

Unity Open MCP does not show up in Gemini CLI. What now?

Restart Gemini CLI fully, check the JSON is valid, and make sure Node.js (for npx) is installed. See common MCP errors and fixes.

Is Unity Open MCP safe?

It scores 79 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.