Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It only states 'List products' and does not disclose the return format, default limit, inclusion of inactive products, or any side effects. The schema hints at an 'active' filter, but the description does not elaborate on behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.