Author

Xin Sun

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Preprint Aug 2026

HopRefusalBench: Diagnosing Refusal Failures in Search-Augmented Agents for Multi-Hop Reasoning

This work introduces HopRefusalBench, the first controlled benchmark of refusal within multi-hop search, and proposes a final-outcome taxonomy spanning target-aware refusal, pseudo-refusal, hallucinated completion, and search-budget exhaustion, together with source-aware trajectory metrics for post-trigger continuation and token waste.

Jianan Xie, Xin Sun, Zhongqi Chen et al. · 0 citations

Preprint Aug 2026

EviSD: Evidence-Conditioned Self-Distillation for Search-Augmented Agents

EviSD is proposed, an evidence-conditioned self-distillation framework that uses instance-level supporting evidence as privileged information for search actions and golden answers as complementary privilege for answer actions, and achieves the highest macro-average Exact Match in all evaluated settings.

Jianan Xie, Xin Sun, Zhongqi Chen et al. · 0 citations