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Xiang Zheng

City University of Hong Kong

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#natural language process... Preprint Oct 2026

My FAULT: Self-Diagnosis as Credit Assignment in Self-Evolving Agentic Reinforcement Learning

Agentic reinforcement learning (RL) has emerged as a powerful approach for training large language model agents on multi-step tasks, yet reliance on terminal outcome rewards creates two credit-assignment problems, particularly in long-horizon tasks. First, same-outcome rollout groups provide no learning signal from ter...

Yi-Hua Zhu, Qian-Ying Liu, Wei Qiao et al. · 0 citations
Preprint Aug 2026

Practice Makes Unsafe: Skill Misevolution in Self-Improving LLM Agents

This work proposes SafeEvolve, which checks each skill when it is written and when a later task retrieves it, and introduces SkillMisevo-Gym, which clears every task session but keeps the skill library, so each of these steps can be checked separately.

Xutao Mao, Liang Zhao, Xiang Zheng et al. · 3 citations · ⚡1
Jul 2026

Agent Hacks Agent: Autoresearch for Production-Agent Red-Teaming

This work presents AHA, a falsifiable discovery loop that proposes a vulnerability hypothesis, constructs a falsifier, instantiates a valid attack, executes it in a sandboxed harness, reflects on the trajectory, and promotes confirmed findings into a Vulnerability Concept Graph (VCG), which provides an auditable artifa...

Xutao Mao, Xiang Zheng, Cong Wang · 3 citations
Preprint Jul 2026

Agents Don't Just Agree, They Remember: Benchmarking Persistent Sycophancy in Stateful Personal Agents

The Personal Agent Sycophancy Benchmark (PASB) is introduced, a 1,600-task benchmark that traces whether a conversational claim is accepted, written into durable agent state, and reused in a later neutral query, and shows that agent sycophancy is fundamentally a state-writing governance problem.

Xutao Mao, Liang Zhao, Leyao Wang et al. · 0 citations

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