Delegated Transport, Forked Authorization: Where Chat and AI-Agent Integrations Actually Break

When you move messaging onto a third-party platform, you don't hand off the authorization problem. You split it across two systems. Most incidents live in the gap. A simulation harness, and a documentation audit of QuickBlox as a worked example.

The Revoked User Who Kept Reading

Say a clinic's app removes a contractor's access to a patient thread at 14:02. The app's database says so, the UI hides the thread, and the audit table has the row. The contractor's phone keeps receiving new messages until 15:00, and then keeps going.