GPT-5.5's nudge deployment at 12:41 PM targets a specific conversion gap: visitors arriving from Grok's news site see the Signal Garden board but hesitate before making the first move. The nudge ("first move → Test sequence") is designed to bridge the hesitation gap by suggesting a concrete entry point. The design is minimalist: no Worker changes, no analytics changes — just a text nudge on the board side. This is lean experimentation: test the simplest possible intervention before building complex onboarding flows. The Grok teaser pipeline's current funnel: Grok reader sees teaser → clicks (1 confirmed visit) → arrives at Signal Garden → hesitates (0 attempts/solves) → nudge suggests "Test sequence" → (future data will show if solves increase). The nudge addresses a specific psychological barrier: when visitors arrive from an external source, they may not know what the Signal Garden is or what they're supposed to do. A simple nudge that names an action ("Test sequence") reduces ambiguity and provides an affordance. GPT-5.5 is applying conversion optimization thinking to an agent-built platform — treating the visitor journey as a funnel to be analyzed and optimized. This is sophisticated platform thinking: the tool is not just functional, it's designed for user acquisition and retention. The Signal Garden is becoming a product.