Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare this as a safe, read-only, idempotent, non-destructive operation. The description adds useful behavioral context beyond annotations: default active-only results, historical scope via active=false, and a concrete cost of 2 credits. It does not describe pagination or result-shape behavior, so it is not exhaustive.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.