Harness design for long-running agents: how Anthropic engineers build an app from scratch

Ash, Andrew

Talks worth your time · Agentic engineering · 2026-09-29 · 40 min · 11 pages

Anthropic engineers just showed how they build a full app from scratch, using a loop of agents 40 minutes from the team behind Claude Code they used three agents: one to plan, one to build, one to judge, cycling until the app actually works the winners won't have the smartest model, they'll have the best loop watch it, then read the full guide on how to actually use loops below

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