How to install Fettle in Codex

To install Fettle in Codex, run "codex mcp add fettle --env FETTLE_API_KEY=YOUR_FETTLE_API_KEY -- npx -y fettle-mcp" in your terminal, then type /mcp in Codex to check it.

Built from the published package · server updated 3 days ago

Run the install command

In a terminal, run:

codex mcp add fettle --env FETTLE_API_KEY=YOUR_FETTLE_API_KEY -- npx -y fettle-mcp

2
Check it
Inside Codex, type /mcp to see the server and its tools.

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

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Questions

Does Fettle work in Codex?

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

Fettle 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 Fettle safe?

It scores 83 of 100. Review the code before you install it, and only give it the access it needs. Grades and details.