Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotations already declare this read-only and non-destructive, so the description is not responsible for that burden. It adds helpful context about what metrics are included, but does not disclose operational behavior such as exact units, time ranges, or any limitations. There is no contradiction with the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.