Summary
One capability, and phone-number format is where it goes wrong.
Every number has to be E.164 — a leading plus and the country code — and anything else comes back with exactly that error. Past that, your Twilio account's rate limits and per-message pricing apply, so an agent that texts freely spends real money.
What it is
A small Node server that lets an assistant send SMS and MMS messages with your Twilio account, plus prompt templates for common messaging situations.
What you get
- SMS sent to a number you give, from your Twilio number
- MMS as well as plain text messages
- Pre-built prompts for the messaging scenarios people ask for most
- Credentials read from the environment rather than typed into the conversation
Requirements
Node.js >= 18 and three environment variables: `ACCOUNT_SID`, `AUTH_TOKEN` and `FROM_NUMBER` — your Twilio number in E.164 format, for example +11234567890. Launch it with `npx -y @yiyang.1i/sms-mcp-server`.
Setup effort
One command plus a key — npx -y @yiyang.1i/sms-mcp-server, then supply credentials