Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations only declare readOnlyHint=true, so safety is covered, and the description does usefully disclose that story/account may be null while the census is always returned. However, an output schema already exists to carry return-value detail, and there is no mention of auth, rate limits, or freshness/latency behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.