Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, idempotentHint=true and readOnlyHint=false, so safety is covered. The description adds value beyond that by stating the real-world consequence ('removes the stop from the technician's day') and the required auth scope (work_order_schedules:write), which are not in the structured fields.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.