Agent quality is becoming a workflow-and-trace problem.
Vercel and GitHub are treating the efficiency of agentic workflows as an engineering performance problem, not merely an API-billing issue. Vercel has added deeper visibility into subagent activity and distributed traces. GitHub, meanwhile, redesigned the workflow and tool instructions behind Copilot code review, lowering its average review cost by roughly 20% without reducing review quality. Together, the updates suggest that agent performance increasingly depends on how workflows are structured, instrumented, and debugged—not just on which model is used.











