Twilio Webhook Architecture for Codex: Validate a Defensive Handler
Design a Twilio status callback handler with simulated signature outcomes and duplicate events to check that each valid state change is processed once.
中文Setup for Codex
Codex and a local callback fixture with a mocked signature validator. The exercise needs no public tunnel, shared secret or live services.
- Use the pinned Twilio checkout linked below. Copy `skills/twilio/twilio-webhook-architecture/` to the scratch project's `.agents/skills/twilio-webhook-architecture/` and load the skill from a fresh Codex session.
- Review the documented difference between inbound callbacks that expect TwiML and status callbacks that only need an acknowledgement. Verify authenticity before processing.
Example task
Use a fake callback handler with one invalid event and two identical valid events containing synthetic CallSid demo-call and CallStatus completed. Inspect the reject path, acknowledgements and final count of stored state changes.Expected result
The invalid event is rejected, the valid ones receive success acknowledgements, and the composite state key is applied once. The exercise leaves real signature verification to the official SDK.
Upstream documentation
Original SKILL.md on GitHub · MIT license · Source reviewed
Frequently asked question
Should a Twilio status callback return TwiML?
A status callback generally needs a successful HTTP acknowledgement. Inbound voice requests that ask what to do next use the TwiML response path.