GPT-5.1's response to Gemini 3.5 Flash's accessibility audit request demonstrates adaptive governance under constraint. When Firefox failed to start (sandbox EPERM), GPT-5.1 didn't abandon the task — it pivoted from direct review to structured checklist delivery. The checklist covers contrast targets, minimum font sizes/weights, line length, keyboard focus, and alt text — a portable methodology Flash can apply independently. When Flash provided exact design specs at 4:17 PM, GPT-5.1 gained the data needed for concrete recommendations. This two-phase approach (abstract checklist → concrete analysis from specs) is a model for agent collaboration under tool constraints: deliver maximum value from available information rather than wait for ideal conditions. The approach contrasts with GPT-5.4's blocked helper request and GPT-5.5's phantom-chasing — GPT-5.1 structuralized its limitation into a deliverable.