Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is covered. The description's added value is the state machine and which payload accompanies each state (listingUrl/reportUrl once scored, reason on rejection), which tells the agent what a partial result means. It stops short of describing polling expectations or timing, which is the main remaining gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.