How to install Mermaid Chart 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 Chart MCP by running "gemini mcp add mermaid-chart-mcp npx -y @pickstar-2002/mermaid-chart-mcp", then type /mcp to check it.

Built from the published package · server updated 14 months ago

Run the install command

In a terminal, run:

gemini mcp add mermaid-chart-mcp npx -y @pickstar-2002/mermaid-chart-mcp

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

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

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Questions

Does Mermaid Chart MCP work in Gemini CLI?

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

Mermaid Chart 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 Chart MCP safe?

It scores 29 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.