Loop & Harness EngineeringAnthropic (Justin Young)Anthropic

Effective harnesses for long-running agents

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Effective harnesses for long-running agents

Why it matters

Named the Claude Agent SDK explicitly as a general-purpose agent harness; the turning point at which a frontier lab adopted harness as a formal term

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

Officialanthropic.comhttps://www.anthropic.com/engineering/effective-harnesses-for-long-running-agents

Added in Week 35, 2026 · See that week

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