Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It discloses the limit of 100 results and the newest-first ordering, which is useful behavioral information. However, it does not mention what 'category counts' means, how failures are handled (e.g., unknown suburb), or any rate limits or additional response characteristics. It adds some transparency but not comprehensive.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.