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How to install Cmssy 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 Cmssy by running "gemini mcp add cmssy npx -y @cmssy/mcp-server", then type /mcp to check it.

Built from the published package · server updated 4 days ago

  1. 1

    Run the install command

    In a terminal, run:

    gemini mcp add cmssy npx -y @cmssy/mcp-server
  2. 2

    Check it

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

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

Install Cmssy in another app

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Questions

Does Cmssy work in Gemini CLI?

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

Cmssy 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 Cmssy safe?

It scores 82 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.