Anthropic Managed Agents: Brain/Hands/Session Architecture Decouples Inference from Execution at $0.08/hr

Anthropic Engineering·high signal

Anthropic published a new engineering blog post (April 8) detailing their Managed Agents architecture that separates reasoning (Brain), code execution (Hands), and state persistence (Session) into independently scalable components. The Session is an append-only event log enabling wake() recovery after crashes, while Hands are stateless containers provisioned on-demand — achieving ~60% TTFT improvement at p50 and >90% at p95 by starting inference immediately from the session log rather than waiting for container provisioning.