Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructveHint, so safety is covered. The description adds useful account-scope context and the automatic-reuse behavior, but does not disclose output shape, ordering, or whether results are paginated. No contradiction with annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.