How to install Keryx 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 Keryx by running "gemini mcp add keryx npx -y @mrciphersmith/keryx", then type /mcp to check it.

Built from the published package · server updated 2 days ago

Run the install command

In a terminal, run:

gemini mcp add keryx npx -y @mrciphersmith/keryx

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

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

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Questions

Does Keryx work in Gemini CLI?

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

Keryx 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 Keryx safe?

It scores 83 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.