Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds behavioral value by specifying the exact output fields (hotel name, dates, room type, rate, status, cancellation policy) and confirming that either a booking ID or confirmation number can be used.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.