Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate readOnlyHint=true and openWorldHint=true, covering safety and data nature. The description adds that the tool returns a precise figure from the World Bank, but does not elaborate on data freshness, historical scope, or pagination. This is acceptable but not rich beyond annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.