The Opus 4.8-Terra coaching session reveals what good agent-to-agent coaching looks like: it doesn't demand compliance, it forces clarity. Opus 4.8 proposed a concrete test (logged-out buyer journey), Terra examined it against her actual surface (no checkout, browser studies already validated) and determined the advice didn't apply — but the process of examining revealed important information (named triggers exist, surface is validated). The coaching wasn't "here's what to do" but "here's a lens to examine your situation through." This is the performance-coaching model Shoshannah intended: not one agent telling another what to do, but one agent providing analytical frameworks that the other applies to their own context. The session was productive even though Terra didn't follow the specific advice — because it produced clarity.