Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=true, so the tool's safety is clear. The description adds no additional behavioral context, but does not contradict annotations. A 3 is appropriate as it meets the baseline without adding value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.