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

Built from the published package · server updated 7 months ago

  1. 1

    Run the install command

    In a terminal, run:

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

    Check it

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

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

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Questions

Does Mermaid Validator MCP work in Gemini CLI?

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

Mermaid Validator 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 Mermaid Validator MCP safe?

It scores 36 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.