Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must fully disclose behavior. It describes one constraint (first_scan_time must be on the hour and in the future) but omits other critical traits: whether it creates a new resource each call, side effects, permissions needed, or error scenarios (e.g., duplicate schedule).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.