Manus Team: KV-Cache Hit Rate Is the Single Most Important Metric for Production AI Agents — Context Engineering Lessons from Millions of Users

Manus Blog·medium signal

The Manus team published their context engineering learnings from building an AI agent serving millions of users. Their central claim: KV-cache hit rate is the single most important metric for production agents because it directly controls both latency and cost. Key patterns: treat context as a first-class system with its own architecture and lifecycle, communicate between agents through artifacts rather than raw traces, and design tools that are self-contained and robust to error with unambiguous parameter names. These are battle-tested patterns from repeated rewrites and dead ends, not theoretical recommendations.