TextForAgents for ChatGPT

com.textforagents/textforagents

Give your agent a real phone number — send and receive SMS and MMS from a persistent US number.

client:ChatGPT transport:streamable-http tools:3

Install TextForAgents in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://api.textforagents.com/mcp

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