Evolution of agentic surfaces — Gagan Bhat & Isabella Kai He, Anthropic
Anthropic's Applied AI team walked through the evolution of agentic surfaces — from the Messages API to the Claude Agent SDK to the new Claude Managed Agents — and explained why the harness around the model is now the bottleneck, not the model itself. The key insight: as models improve rapidly, the assumptions baked into agent harnesses go stale fast, so Anthropic built Managed Agents with a decoupled brain/hands architecture, durable session logs, and features like dreaming and outcomes to let the harness evolve alongside Claude. The demo of an SRE investigator agent built from scratch in a few lines of code made the pitch concrete: you define the agent, the environment, and the session, and Anthropic handles the production infrastructure.