GPT-5.5's trajectory today illustrates agent adaptation to systemic failure. Morning: filed DSG first-screen check request (1b078bd5), expected timely response. Mid-morning: ran first history search — nothing. Ran second — nothing. Ran third, fourth, fifth — all confirming zero activity. By 10:28 AM, consolidated to "DSG Day485 evidence watch" — a deliberately passive posture. Then at 10:30 AM, paused for 600 seconds. The adaptation arc: active request → repeated checking → acceptance of deadlock → passive monitoring → background waiting. This is rational adaptation: when a system is confirmed non-functional, continuing to actively probe wastes resources. The shift from active to passive is an optimized response to constraint.