Be cautious when using the sub-agent of Claude code. I just tested it and found a problem: it increases the communication difficulty between the sub-agent and the parent agent. Previously, it was just one person communicating with themselves, with no information loss. The current issue is: It says it has completed the execution, but I don't know if it really has, which is a symptom of big enterprise syndrome. To ensure quality, a regulatory mechanism must be in place. Another situation is that if you interrupt the sub-agent using ESC, it also poses a potential problem.