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In this study we investigate on a cognitive delegation agent for UAV task-based mission management. Particularly, we advocate a specific high-level feedback provided by the agent to the human operator to enhance mission effectiveness. As extension to human supervisory control we suggest to introduce the concept of agent supervisory control where the agent is delegated by high-level operator commands and controls several sub-systems aboard the UAV fulfilling the mission in highly automated fashion. Results of our experimental human-in-the-loop study focusing on the effects of high-level feedback are presented. Therefore, two configurations are compared, one with basic feedback and one with full feedback. The results show that particularly during in-flight re-planning situations the full feedback is beneficial. Interaction times and task related activities are significantly lower. In the pre-flight mission preparation phase no significant effect were found. Results can be used to further develop highly automated (multi)-UAV mission management systems.