Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and does a solid job: it discloses the side effects (verdict nulled on every find, removed from list_kept_finds), idempotent/retry-safe behavior, and cost ('Free'). It omits auth requirements (the api_key parameter) and any error behavior, keeping it short of a 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.