Install Mimecast in Codex

What you need first

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

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 mimecast-mcp --env MIMECAST_CLIENT_ID=YOUR_MIMECAST_CLIENT_ID --env MIMECAST_CLIENT_SECRET=YOUR_MIMECAST_CLIENT_SECRET -- docker run -i --rm -e MIMECAST_CLIENT_ID -e MIMECAST_CLIENT_SECRET ghcr.io/wyre-ai/mimecast-mcp:v1.3.9

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

Check it worked

Ask Codex: List the tools of mimecast-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.