Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so safety is covered. The description adds genuinely non-redundant behavior: provenance (source regulation, UN Comtrade 2023, World Bank indicator prices) and the fact that it returns a verification date, which signals a static snapshot rather than live data. Missing only pagination or table-size behavior, hence not a 5.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.