Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already provide readOnlyHint=true, destructiveHint=false, openWorldHint=true, and idempotentHint=true, indicating safe, non-destructive, and repeatable operations. The description adds value by specifying the return data (order status, recipient, costs, items, shipment info) and the format option, which are not covered by annotations. No contradiction with annotations exists.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.