MCP in ChatGPT.
Custom connectors, developer mode, done.
ChatGPT connects to MCP servers through connectors. The built-in ones cover the big-name apps; custom connectors cover everything else, including your calendar. The catch is that custom MCP connectors sit behind developer mode and a paid plan, and only remote servers work. Here's the full path.
Set it up
- 1Enable developer mode. Open Settings, go to Connectors, then Advanced settings, and turn on developer mode. This is what unlocks custom MCP connectors; it's available on paid ChatGPT plans.
- 2Create the connector. Back in Connectors, choose Create, name it Amie, and paste the server URL:
https://mcp.amie.so
- 3Sign in and enable it in a chat. Complete the OAuth prompt, then in the conversation composer open the tools menu and switch the connector on. Now ask ChatGPT what's on your calendar tomorrow.
What works, and what doesn't
ChatGPT's MCP support is remote-only: it will never launch a process on your machine, so the local servers you see in GitHub READMEs (the ones started with npx or docker) can't be used directly. Anything with a hosted URL works. Connectors also need to be toggled on per chat, which surprises people coming from Claude, where connected tools are just there.
The practical consequence: for calendar access from ChatGPT you want a hosted server rather than a self-hosted Google Calendar container. Amie's is one URL and covers Google Calendar (multiple accounts), Outlook, todos, and meeting notes together.