Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It states that it lists objects and data-blocks but does not clarify whether this is a read-only operation, what data is returned, or whether it has any side effects. It implies a non-destructive action but fails to explicitly state that.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.