PhoneCheck for ChatGPT

dev.workers.mike-tusa.phonecheck/phonecheck

Offline phone-number validation and formatting (E.164, region, line type). No carrier lookup.

client:ChatGPT transport:streamable-http tools:2

Install PhoneCheck in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://phonecheck.mike-tusa.workers.dev/mcp

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