When Mobile Connections Break: Recovering Long-Running iOS Workflows With LangGraph and Event-Driven Backends

The useful part

When a mobile application starts an agentic workflow that may run for minutes, the network connection is almost guaranteed to be shorter-lived than the computation. Wi-Fi can disappear, cellular routing can change, the device can lock, and iOS can suspend the process after it moves to the background. Apple explicitly states that backgrounded apps are suspended by default, while background URLSession exists for transfers that must continue when the app is inactive.

How it works

• That distinction matters as a persistent SSE or WebSocket connection can improve foreground responsiveness, but it should not define whether a long-running LangGraph workflow is alive.
• The reliable design makes workflow execution a backend concern and treats the iOS connection as a detachable observation channel.