There’s a failure mode in on-device AI agents that doesn’t show up in testing. It shows up five minutes into a real session. The device gets warm. The CPU downclocks. Latency spikes. The agent that responded in 200ms is now taking 800ms. Users don’t report “thermal throttling” — they report “it got slow” or “it stopped working.” By the time you’re debugging, it looks like a model problem. It’s not. What’s actually happening Android’s thermal system throttles CPU and GPU frequency ...