Effective Harnesses for Long-Running Agents
BlogAnthropic EngineeringJun 14, 2026
AI Summary
How to make an agent stay coherent across hours or days when each session starts with a blank context window. Anthropic's solution: an initializer agent that sets up the environment once, plus a coding agent that makes incremental progress and writes a claude-progress.txt file alongside git history for the next session to consume. The post that finally gave 'long-running agent' an answer that isn't just 'bigger context window.'
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