Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the full burden of behavioral disclosure. It only says 'Get ... statistics,' which is essentially a restatement of the tool's name. It does not explicitly state that it's read-only, what data it aggregates, or any potential side effects or rate limits.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.