Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, so safety is covered; the description adds the important behavioral caveat that returned state is indexed (i.e., potentially stale) and prescribes a concrete follow-up path for fresh values. No auth, rate-limit, or failure-mode context is given, keeping it below a 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.