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How to install Fonoster 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 Fonoster MCP by running "gemini mcp add fonoster-mcp npx -y @fonoster/mcp", then type /mcp to check it.
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Run the install command
In a terminal, run:
gemini mcp add fonoster-mcp npx -y @fonoster/mcp - 2
Check it
Inside Gemini CLI, type /mcp to list servers and tools.
MCP servers run with your permissions. If Fonoster MCP needs an API key, add it under env in the config. Check its README.
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Questions
Does Fonoster MCP work in Gemini CLI?
Yes. Gemini CLI supports local and remote mcp servers, extensions (legacy), and Fonoster MCP installs with the steps above.
Fonoster 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 Fonoster MCP safe?
It scores 91 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.