How to install Mermaid MCP Server in Codex

To install Mermaid MCP Server in Codex, run "codex mcp add mermaid-mcp-server -- npx -y @mseep/mermaid-mcp-server" in your terminal, then type /mcp in Codex to check it.

Built from the published package · server updated 16 months ago

Run the install command

In a terminal, run:

codex mcp add mermaid-mcp-server -- npx -y @mseep/mermaid-mcp-server

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Check it
Inside Codex, type /mcp to see the server and its 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 Codex?

Yes. Codex supports mcp servers in the codex cli and ide extension, and Mermaid MCP Server installs with the steps above.

Mermaid MCP Server does not show up in Codex. What now?

Restart Codex 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 58 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.