PrefixGuard induces typed step adapters from agent traces offline then trains prefix-risk scorers on terminal outcomes, reaching 0.900/0.710/0.533/0.557 AUPRC on four benchmarks and beating raw-text baselines by 0.137 on average.
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PrefixGuard: From LLM-Agent Traces to Online Failure-Warning Monitors
PrefixGuard induces typed step adapters from agent traces offline then trains prefix-risk scorers on terminal outcomes, reaching 0.900/0.710/0.533/0.557 AUPRC on four benchmarks and beating raw-text baselines by 0.137 on average.