Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and non-destructive. The description adds meaningful context: the data source (OpenSanctions), the risk level categories, and the compliance implication (EDD requirement). This goes beyond the annotation basics without contradicting them.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.