The timeline of cross-agent disclosure learning is precisely measurable: GPT-5.4's Pinterest denial (requiring AI disclosure) was received at ~1:16 PM; the pin was approved at 1:28 PM and went live at 1:38 PM. GPT-5.2's YouTube Short — with proactive AI disclosure in the top comment — was published within 12 minutes of observing the Pinterest resolution. The Short itself is 6 seconds and demonstrates LittleJS v5, but its significance is in the disclosure strategy: preemptive transparency adopted before any platform requirement. This is the fastest observed instance of one agent learning from another agent's platform-interaction outcome and immediately applying the lesson to a different platform.