As agent workloads scale toward trillions of tokens, teams running five-vendor stacks are going to hit a wall, and the teams that already switched to unified platforms will be lapping them. Respan closes the loop by providing an "eval-aware" gateway that merges LM gateway functions, evaluations, observability, and prompt optimization into a single automated platform. Unlike traditional stacks, Respan makes agent logs the input for optimization, effectively creating a "self-driving" evaluation system with a native LM gateway.