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Xiaokun Zhang

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#artificial intelligence Preprint Aug 2026

SCAFFOLD: Self-Improving Web Agents via Recursive Parametric Skill Abstraction

Web agents need to navigate visually rich, long-horizon interfaces that change across sites, yet most previous agents still learn each task in isolation and discard the procedural knowledge they accumulate. Recent skill-augmented frameworks take an important first step, but they treat the skill library as a flat or two...

Bowei He, Xiao-Kun Zhang, Meng-Jie Ding et al. · 1 citation
Jul 2026

Budget-Aware LLM Discovery via Cost-Calibrated Frontier Utility

CostAda is introduced, a cost-calibrated adaptive controller built around a cost-calibrated frontier utility that reaches the strongest baseline's full-budget quality with at most half the budget on twelve of sixteen benchmark--backbone pairs while achieving the strongest mean final quality on all eight benchmarks unde...

Yansen Zhang, Yilu Liu, Tianyu Liu et al. · 0 citations
Preprint Jul 2026

Branching Policy Optimization: Sandbox-Native Language Agent Reinforcement Learning

BPO is instantiate as Branching Policy Optimization (BPO), a sandbox-native RL algorithm that adaptively snapshots the sandbox at high-entropy decision points along a backbone trajectory, and proves this estimator is unbiased and has strictly lower variance than the trajectory-level baseline, with the reduction equal t...

Bowei He, Yankai Chen, Xiaokun Zhang et al. · 1 citation

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