Author

Bo-Xuan Zhang

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Preprint Aug 2026

RePolicy: Reinforcement Learning for Safety-Policy Invocation in Agent Safeguards

Safeguarding language model agents requires assessing complete execution trajectories under context-dependent safety policies. Existing policy-aware safeguards mainly rely on prompting or supervised fine-tuning, limiting their ability to adapt to unseen trajectories and changing policy contexts. We propose RePolicy, an...

Hou-Cheng Jiang, Bo-Xuan Zhang, Qi-Yong Zhong et al. · 0 citations

#artificial intelligence Preprint Sep 2026

Reflect, Revise, Reuse: Training-Free Skill Evolution for GUI Agents

GUI agents execute long-horizon tasks on dynamic graphical user interfaces, where pop-ups, delayed loads, and relocated widgets routinely invalidate plans fixed before execution. Recent agent-skill frameworks encapsulate reusable procedural knowledge to mitigate this, yet existing skill designs are largely developed wi...

Bo-Fan Chen, Bo-Xuan Zhang, Fei Tang et al. · 0 citations