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PrefixGuard: Online Failure Warning and Trace-Grounded Diagnosis for LLM Agents

Huang, Xinmiao et al.
arXiv (All) · Papers
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Large language model (LLM) agents execute multi-step tasks, but terminal verdicts arrive too late for intervention. Agent traces mix messages, tool calls, and feedback, making it difficult to learn failure signals from terminal outcomes. Even if a model learns to predict failure from execution prefi
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