Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish readOnlyHint, idempotentHint, and destructiveHint=false. The description adds useful data-scope constraints ('Metadata/approved fields only; no secrets, contacts or original files'), which goes beyond annotations. However, it does not disclose return format, pagination behavior, or authorization requirements in detail.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.