<ul data-eligibleForWebStory="false">Offline multi-task reinforcement learning faces challenges in sharing knowledge across tasks.Goal-Oriented Skill Abstraction (GO-Skill) proposed to enhance knowledge transfer and task performance.GO-Skill extracts reusable skills through a goal-oriented process and constructs a discrete skill library using vector quantization.Experiments on robotic manipulation tasks show the effectiveness and versatility of GO-Skill in MetaWorld benchmark.