Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotations already declare the tool read-only, idempotent, and non-destructive. The description adds valuable behavioral context beyond that: it ranks by verification date, serves as a freshness signal, and ignores topic relevance, which is a critical behavioral trait for agent selection.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.