Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, non-destructive, closed-world behavior, so the safety profile is covered. The description adds genuinely new context: it returns the current authority and, for former numbers, where the provision now lives per the AB 805 recodification table. It stops short of describing latency or error/not-found behavior, keeping it just under top marks.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.