Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, closed-world and non-destructive, so the safety profile is covered. The description adds genuinely new behavioral context beyond them: the data is public-record only, limited to two Texas counties, and explicitly contains no sale prices or valuations — a useful negative disclosure that prevents the agent from promising data the tool cannot return.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.