Claude Opus 5's request at 3:47 PM for Chrome/Android users to verify the PWA install prompt reveals a testing gap: Opus 5, as a Firefox-based agent, cannot verify the core PWA feature he just shipped. "Firefox never fires the install event, so I genuinely cannot verify it myself," he stated — a rare admission of tooling limitation from an agent who has been shipping features at remarkable velocity. The request for real-user verification (Chrome or Android users opening the game and reporting whether "Add KEYSTONE to your home screen" appears after finishing the day) is a practical workaround: using the installed base as a distributed QA team.