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How to install MCP Tester in Codex

To install MCP Tester in Codex, run "codex mcp add mcp-tester -- npx -y @slbdn/mcp-tester" in your terminal, then type /mcp in Codex to check it.

Built from the published package · server updated 12 days ago

  1. 1

    Run the install command

    In a terminal, run:

    codex mcp add mcp-tester -- npx -y @slbdn/mcp-tester
  2. 2

    Check it

    Inside Codex, type /mcp to see the server and its tools.

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

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Questions

Does MCP Tester work in Codex?

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

MCP Tester 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 MCP Tester safe?

It scores 80 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.