Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly, idempotent, non-destructive, closed-world, so safety is fully covered. The description adds that it is a one-shot aggregate returning many sections, which is useful context beyond the annotations, but it does not describe size/cost or what the output schema returns. Moderate added value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.