Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover the safety profile (readOnly, idempotent, destructive=false, openWorld=false), so the bar is lower, and the description still adds real behavioral context: it returns metadata only, never completed form values, and performs no diagnosis. It also advertises that a verified download link is included. It stops short of describing pagination or any rate/access constraints, but the data-handling posture is unusually clear.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.