{"name":"Send SMS (Textbelt)","description":"Send a text message (SMS) to a phone number via Textbelt. Input: `to` (E.164 phone number like +12125551234), `body` (message text, max 1600 chars). Returns: delivery status with message ID. $0.015 per message. To send to multiple recipients, make one call per number. DELIVERABILITY WARNING: this service rides Textbelt's shared long-code numbers. US carriers (AT&T/Verizon/T-Mobile) silently filter A2P traffic on shared LCs that contains URLs OR bare domains (e.g. `zclk.cc`, `example.com/foo`) — the message will be DROPPED at the carrier with no error from Textbelt. Protocol URLs (`http://`, `https://`) are also rejected by Textbelt itself with a clear error. For URL-bearing messages, use a verified-sender path (Vonage toll-free) instead. This service polls Textbelt for delivery status and throws if the carrier drops the message — so you will get a clear 502 instead of a silent paid-but-not-delivered."}