Explore a 22-minute conference talk from the ACM CHI Conference on Human Factors in Computing Systems that delves into the concept of Co-Performing Agents. Learn about designing intelligent systems that foster user-agent partnerships in learning and adaptive services. Discover how researchers used a Wizard-of-Oz-based probe to study user experiences with cooperative agents over a two-month period. Gain insights into factors affecting co-performing behaviors and design implications for building resilient user-agent partnerships. Understand the importance of feedback, partnership mindsets, and participatory design in improving personalized service experiences. Examine the role of initial mental models, common ground, and teaching behaviors in shaping user-agent interactions.