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How to install Claude Mermaid in Codex

To install Claude Mermaid in Codex, run "codex mcp add claude-mermaid -- npx -y claude-mermaid" in your terminal, then type /mcp in Codex to check it.

Built from the published package · server updated 2 days ago

  1. 1

    Run the install command

    In a terminal, run:

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

    Check it

    Inside Codex, type /mcp to see the server and its 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 CodeWindsurfGemini CLI Antigravity CLI ChatGPT

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Questions

Does Claude Mermaid work in Codex?

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

Claude Mermaid 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 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.