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How to install Three.js DevTools 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 Three.js DevTools MCP by running "gemini mcp add three-js-devtools-mcp npx -y threejs-devtools-mcp", then type /mcp to check it.

Built from the published package · server updated 6 days ago

  1. 1

    Run the install command

    In a terminal, run:

    gemini mcp add three-js-devtools-mcp npx -y threejs-devtools-mcp
  2. 2

    Check it

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

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

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Questions

Does Three.js DevTools MCP work in Gemini CLI?

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

Three.js DevTools 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 Three.js DevTools 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.