Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With readOnlyHint and destructiveHint annotations already covering safety, the description adds valuable behavioral detail: scoring affects ordering, non-scored venue types are grouped after scored ones, ordering is by recency within groups, and pre-2026-06-06 dates are estimates. These are exactly the kind of non-obvious behaviors an agent needs to interpret results correctly.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.