Hailbell for ChatGPT

com.hailbell.api/hailbell

In-app support chat and push notifications for iOS, Android and web apps: reply, send pushes.

client:ChatGPT transport:streamable-http

Install Hailbell in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://api.hailbell.com/mcp

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