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Pruning Failed Attempts From Chat History Beats Accumulating Them for Coding Agents

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A benchmark test of coding agent memory compared keeping failed code patches and full error traces in conversation history against rolling back failed attempts and retaining only a short lesson. Both approaches ultimately passed all 20 hidden test cases on a three-module payment settlement task. The pruned approach needed one fewer model call and used about 93% fewer cumulative input tokens, cutting API cost by roughly 80%. It also finished about 1.57 times faster, suggesting that accumulated failed history can poison an agent's later reasoning.

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