Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already mark the tool read-only, idempotent, and non-destructive, so the description does not need to restate safety. It adds value by disclosing the return shape (text snippets, authors, citations) but not search behavior details such as required query, optional filtering, pagination, or limitations. This adds modest context beyond the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.