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Loop & Harness EngineeringAnthropic Labs (Prithvi Rajasekaran)Anthropic

Harness design for long-running application development

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Harness design for long-running application development

Why it matters

3 agents — Planner, Generator, Evaluator; a single agent ran 20 minutes for $9 versus 6 hours for $200 with the full harness

Source — Primary sources first; secondary reports are labelled “Press”

Officialanthropic.comhttps://www.anthropic.com/engineering/harness-design-long-running-apps

Added in Week 35, 2026 · See that week

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