Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already mark readOnlyHint=true, destructiveHint=false, idempotentHint=true. The description adds context: explains the data fields (action, filename, actor_username, created_at), ordering (newest first), scope (own vault), and authentication requirement. 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.