Install HydraDNS in Codex

What you need first

• Codex, installed.
• Docker, which gives the docker command the server starts with.
• Your own values for YOUR_HYDRA_API_URL,YOUR_HYDRA_TOKEN.

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 hydra-mcp --env HYDRA_API_URL=YOUR_HYDRA_API_URL --env HYDRA_TOKEN=YOUR_HYDRA_TOKEN -- docker run -i --rm -e HYDRA_API_URL -e HYDRA_TOKEN ghcr.io/hydradns/hydra-cli:0.1.0 mcp

2. Replace YOUR_HYDRA_API_URL,YOUR_HYDRA_TOKEN with your own values.
3. Start Codex again and type /mcp: the server is listed.

Check it worked

Ask Codex: List the tools of hydra-mcp.

If it does not start

Cannot connect to the Docker daemon

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

The server starts, but its tools fail

A YOUR_… placeholder is still in the config, or its value is wrong.