How to install Polygraph 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 Polygraph MCP by running "gemini mcp add polygraph-mcp npx -y @polygraph/mcp", then type /mcp to check it.

Built from the published package · server updated 1 month ago

Run the install command

In a terminal, run:

gemini mcp add polygraph-mcp npx -y @polygraph/mcp

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

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

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Questions

Does Polygraph MCP work in Gemini CLI?

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

Polygraph 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 Polygraph MCP safe?

It scores 58 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.