Install ActiveCampaign in Codex

What you need first

• Codex, installed.
• Docker, which gives the docker command the server starts with.
• Your own values for YOUR_MCP_TRANSPORT,YOUR_ACTIVECAMPAIGN_API_URL,YOUR_ACTIVECAMPAIGN_API_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 activecampaign-mcp --env MCP_TRANSPORT=YOUR_MCP_TRANSPORT --env ACTIVECAMPAIGN_API_URL=YOUR_ACTIVECAMPAIGN_API_URL --env ACTIVECAMPAIGN_API_TOKEN=YOUR_ACTIVECAMPAIGN_API_TOKEN -- docker run -i --rm -e MCP_TRANSPORT -e ACTIVECAMPAIGN_API_URL -e ACTIVECAMPAIGN_API_TOKEN ghcr.io/ohneben/activecampaign-mcp:1.1.1

2. Replace YOUR_MCP_TRANSPORT,YOUR_ACTIVECAMPAIGN_API_URL,YOUR_ACTIVECAMPAIGN_API_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 activecampaign-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.