Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, so the safety profile is covered; the description reinforces this with 'without mutating cart or checkout,' which adds minor domain context (cart/checkout are untouched). It discloses nothing further about pagination, limits behavior, or result quality, and an output schema already covers return shape.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.