Twilio Communications

Build communication features with Twilio: SMS messaging, voice calls, WhatsApp Business API, and user verification (2FA). Covers the full spectrum from simple notifications to complex IVR systems and multi-channel authentication. Critical focus on compliance, rate limits, and error handling.

Catalog modification notice: qualified rate/segmentation and verification claims, repaired signature coverage, serialization and pacing examples. The imported Apache-2.0 source attribution is retained.

Use this to implement the requested integration, not to activate calls/campaigns by implication. Establish exact recipients/senders, approved message/purpose/spend and recording scope; use owned test numbers and preserve opt-outs. Verify current channel, region, sender-registration and recording requirements with official provider guidance before activation. SMS possession alone is not phishing-resistant authentication or proof of account ownership; bind OTP challenges to authenticated sessions/destination/purpose, limit attempts and prevent enumeration/pumping. All examples are partial: storage, opt-out and delivery handlers are stubs, and a successful create response means accepted/queued, not delivered.

Detailed Guide

Read the detailed guide before executing this skill. It retains the complete procedure and reference material. Treat its safety, prerequisites, and validation requirements as mandatory. For focused work, load the relevant sections; for end-to-end work, read the guide completely.