Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full transparency burden. It clearly signals a read-only metadata operation and discloses the type of content returned. It does not detail response format or error behavior, but for a zero-parameter introspection tool these gaps are minor.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.