Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It discloses that results are scoped to the caller's private orders and include statuses, but it does not state that this is read-only, whether authentication is required, pagination behavior, or 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.