Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true and openWorldHint=true, so the tool is known to be read-only. The description adds no further behavioral context, such as what specific stats are returned or any caveats about invalid URLs. It does not contradict annotations, but adds minimal value beyond them.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.