Holdbird for ChatGPT

com.holdbird/holdbird

Holdbird calls customer-service lines for you, gets through phone menus and hold, then rings you.

client:ChatGPT transport:streamable-http

Install Holdbird in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://api.holdbird.com/mcp

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