Agent Interface
REST APIWebhooks (Status Callbacks)TwiMLTwilio Functions (Serverless)
What an agent can do
- ✓Send and receive SMS, MMS, and WhatsApp messages
- ✓Make and receive phone calls with programmable voice
- ✓Handle real-time call routing with TwiML instructions
- ✓Send email via SendGrid API (Twilio subsidiary)
- ✓Look up phone number details and carrier information
- ✓Create and manage video rooms for conferencing
What it can't do
- ✗Access call audio recordings in real-time (post-call only)
- ✗Modify account billing or pricing plans via API
- ✗Bypass carrier-level spam filtering on messages
- ✗Send messages to unsubscribed recipients (compliance-enforced)
- ✗Access Twilio AI Assistants training data
Auth Model
Account SID + Auth Token (Basic Auth)API Key + Secret
Builder Notes
Industry-standard communications API. Webhook-driven architecture makes it naturally agent-friendly. TwiML enables voice agents to handle calls programmatically. Rate limits vary by product (SMS: 1 msg/sec default, upgradeable).
Sources
Last verified: 2026-03-15