Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover read-only, idempotent, and non-destructive behavior, and the description adds useful behavioral context: the results are 'curated', limited to ABS/RBA/APRA sources, and 'unranked' compared to search. This goes beyond the structured annotations without contradicting them, though it does not detail pagination or response shape.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.