Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint false), and 'Read-only' simply restates that. The one genuinely new behavioral fact is ranking: relevance-ranked when query is supplied, otherwise popularity-ordered; the enumerated result fields (price, rating, review count, duration, book link) duplicate the output schema and earn no credit.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.