Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds one genuine behavioral fact beyond that: all_pages may issue multiple read-only requests, which signals extra latency/request volume. It says nothing about pagination behavior, ordering, or result size, so it adds only modest value over the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.