Text Agents

Two-way SMS conversations powered by the same agent runtime.

How SMS works

A Text Agent replies to inbound SMS on a Twilio number. Each message runs through the LLM (with the agent's prompt, tools, and knowledge) and the reply is sent back as a text. Conversation state is kept per phone number so the agent remembers the thread.

  1. Provision an SMS-capable Twilio number under Phone Numbers.
  2. Point the number's Messaging webhook at the platform's inbound SMS endpoint.
  3. Assign the number to a published Text Agent.

Pricing

SMS is billed per message: the Twilio carrier cost (≈ $0.0079/message) plus the LLM cost for the reply, all at cost. Because there's no STT/TTS/telephony minute, text is the cheapest channel.