Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the description didn't need to restate safety. The description adds useful behavioral context: it requires the buyer key issued at confirmation (an authorization credential), and it lists the specific data dimensions returned, which helps the agent understand the scope of the read operation. It could add a bit more about error conditions (e.g., invalid key, unregistered agency), but the annotations plus the detailed field list give strong transparency.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.