Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, description carries full burden. It discloses key error conditions (NOT_FOUND for missing/non-owner, CONFLICT if not CLOSED), but does not mention side effects, reversibility, authentication needs, or rate limits. Partial disclosure but insufficient for a mutation tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.