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

Built from the published package · server updated 2 days ago

  1. 1

    Run the install command

    In a terminal, run:

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

    Check it

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

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

Install Claude Mermaid in another app

Claude CodeClaude DesktopCursor VS CodeWindsurf Codex Antigravity CLI ChatGPT

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Questions

Does Claude Mermaid work in Gemini CLI?

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

Claude Mermaid 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 Claude Mermaid safe?

It scores 78 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.