Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish read-only, idempotent, non-destructive behavior; the description adds meaningful behavioral context: NOT_FOUND on unknown or foreign IDs, conditional inclusion of outcome, and tier access restrictions. 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.