Why Your AI UX Is Broken (and It's Not the Model's Fault) — Mike Christensen, Ably
May 17, 2026 · 18:38
Mike Christensen, a staff engineer at Ably, argues that direct HTTP streaming (SSE) for AI chat apps breaks because it ties a response stream to a single connection, making resumability, multi-device sync, and live control mutually exclusive. He introduces durable sessions—a persistent, shared resource decoupled from any individual client or agent—built on Ably's Pub/Sub channels, which automatically handle reconnection, cross-tab synchronization, and concurrent multi-agent activity without complex plumbing. Christensen demonstrates with a live demo: a forced network disconnect that self-recovers, two tabs in perfect sync, two agents running in parallel without an orchestrator, and a handoff to a human agent who joins mid-conversation with full history. The episode concludes that treating the session as a durable shared resource unlocks resilient, multi-surface, and live-controllable AI experiences that the standard request-response model cannot support.
