Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description conveys several key behaviors: sponsored products are always labelled and only shown when genuinely suitable, cart changes require explicit user approval, and an expected runtime of ~15s. These operational details exceed what is minimally expected.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.