TopMessage for ChatGPT

com.topmessage/mcp

Send and schedule SMS and WhatsApp messages, manage contacts and templates, and track delivery.

client:ChatGPT transport:streamable-http

Install TopMessage in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://api.topmessage.com/mcp

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