Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint and destructiveHint as false, so the description correctly aligns with a safe, read-only search. Beyond annotations, the description adds valuable behavioral details: returns up to 10 results, independent term matching with coverage-based ranking, exact phrase matching for quotes, and automatic diacritic handling. This adds significant depth beyond annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.