Install ultranix-mcp in Codex

What you need first

• Codex, installed.
• Docker, which gives the docker command the server starts with.

Steps

1. Run this in a terminal. It writes the server into ~/.codex/config.toml, which the Codex CLI, its IDE extension and the ChatGPT desktop app share.

codex mcp add ultranix-mcp -- docker run -i --rm ghcr.io/jxoesneon/ultranix-mcp:1.4.0

2. Start Codex again and type /mcp: the server is listed.

Check it worked

Ask Codex: List the tools of ultranix-mcp.

If it does not start

Cannot connect to the Docker daemon

Docker is not running. Start it, then restart Codex.