sms-test-author

Overview

Twilio is the dominant SMS provider for B2B SaaS; this skill targets Twilio test patterns. The principles transfer to other providers (Vonage, MessageBird, Plivo) with provider-specific sandbox patterns.

The core challenge: SMS sends cost money + actually deliver to real phones. Test patterns avoid both via:

1. Test Credentials - separate accountSid + authToken for testing; calls succeed/fail per the test pattern but never actually deliver
2. Magic Numbers - special phone numbers in the +15005550000 - +15005550009 range with documented behavior

When to use