Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover the safety profile (readOnlyHint, idempotentHint, destructiveHint=false), so the bar is lower. The description does add one genuinely useful behavioral fact beyond the annotations: unauthorized related fields are masked in the response. It does not say which fields get masked or what permission governs that, so the disclosure is only partial credit.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.