Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare read-only, idempotent, closed-world and non-destructive behavior, so the safety profile is covered. The description adds little beyond the scope hint, and it never explains what 'recovered' means (backfilled? re-derived?), how large results can be, or the meaning of the limit/offset window.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.