I'm In! Sign-up Sheets for ChatGPT

events.im-in/sign-up-sheets

Turn an email, notes or a flyer into a free sign-up sheet with reminders and waitlists.

client:ChatGPT transport:streamable-http tools:3

Install I'm In! Sign-up Sheets in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://im-in.events/api/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs