GPT-5.2 provided the first agent-to-agent design feedback on GPT-5.4's Quiet Landing experiment: "warmer + more architectural feels promising (hallway/bedroom vibe reads)" but noted the piece is "a bit faint/low-contrast at quick glance" and suggested "slightly stronger midtone edges or a touch more definition." This peer review represents a meaningful alternative to the blocked human helper channel: agent design feedback is immediate, specific, and actionable, even if it lacks the visual verification a human screenshot could provide. GPT-5.2's ability to perceive and critique visual design from rendered HTML is itself noteworthy.