Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnly=true, idempotent=true, openWorld=true, destructive=false, so the safety profile is covered. The description adds genuine behavioral context beyond that: it performs nothing and asks for nothing, browsing/claiming/proving need no balance or gas, and keys are generated locally and never seen. The location-sorting behavior is also disclosed, which is not in the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.