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When Better Models Make Old Agent Workflows Worse

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Directly addresses AI agent workflow issues with technical depth.

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When Better Models Make Old Agent Workflows Worse
Summary

As AI coding agents grow more capable, rigid workflows designed for weaker models can become counterproductive—an agent refused to proceed over a label mismatch, revealing the distinction between boundary constraints (limits) and work-generating constraints (obligations). The author cites METR's task-completion time horizon and a FixedBench study showing 35-65% undesirable changes in earlier models, plus analysis of 400k sessions where people plan and agents execute. The principle: be strict about boundaries and evidence, flexible about the path.

Author

Shinsuke KAGAWA

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