Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond the readOnlyHint/idempotentHint annotations, the description discloses meaningful behaviors: case- and diacritic-insensitive matching, English fallback for localized guides, and the meaning of response_size_limited with a concrete follow-up action. This adds real value and contains no contradictions.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.