Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full disclosure, and it does signal that this is a read-only enumeration returning three named fields. It says nothing about result size, ordering, pagination, or whether tools needing other setup are excluded — relevant for a tool that dumps an entire catalog.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.