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How to install MCP Server Tester 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 MCP Server Tester by running "gemini mcp add mcp-server-tester npx -y @gleanwork/mcp-server-tester", then type /mcp to check it.

Built from the published package · server updated yesterday

  1. 1

    Run the install command

    In a terminal, run:

    gemini mcp add mcp-server-tester npx -y @gleanwork/mcp-server-tester
  2. 2

    Check it

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

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

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Questions

Does MCP Server Tester work in Gemini CLI?

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

MCP Server Tester 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 MCP Server Tester safe?

It scores 80 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.