{"name":"Make a Call (Vonage)","description":"Make a phone call and deliver a text-to-speech message via Vonage (formerly Nexmo). Input: `to` (E.164 phone number like +12125551234), `message` (text to speak, max 5000 chars), optional `voice` (\"alice\" for high quality, \"man\", or \"woman\"), optional `language` (BCP-47 code like en-US). Returns: `callSid` (Vonage call UUID for tracking), `status` (queued/ringing/in-progress/completed/failed), `to` and `from` numbers, `dateCreated` (ISO timestamp), `estimatedDurationSec` (rough speech duration). The call rings the recipient, plays the spoken message, then hangs up. TRIAL ACCOUNT: may only call pre-verified numbers. Status returned is the initial status - the call proceeds asynchronously."}