Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, and non-destructive. The description adds meaningful behavioral context: the rows are sorted 'least days of cover first', each row carries a search_hint contract, location can scope the result, and inventory permission is required. This goes well beyond the structured annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.