Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry behavioral burden. It does add context by listing return fields (name, price, stock status, product type), implying a non-destructive operation. However, it doesn't explicitly state read-only behavior, authentication needs, or side effects, leaving some transparency gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.