Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, so the description need not add safety context. It adds no extra behavioral details (rate limits, auth, etc.), but it is consistent and sufficient for a simple getter. Score 3 because description adds only marginal value beyond annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.