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How to install Mermaid MCP Server 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 Mermaid MCP Server by running "gemini mcp add mermaid-mcp-server npx -y mermaid-mcp-server", then type /mcp to check it.

Built from the published package · server updated 16 months ago

  1. 1

    Run the install command

    In a terminal, run:

    gemini mcp add mermaid-mcp-server npx -y mermaid-mcp-server
  2. 2

    Check it

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

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

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Questions

Does Mermaid MCP Server work in Gemini CLI?

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

Mermaid MCP Server 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 Mermaid MCP Server safe?

It scores 34 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.