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, but it only says 'List trash.' It does not clarify what 'trash' refers to, whether the operation is read-only, what scope is covered, or any side effects. The verb 'list' implies reading, but that is inference, not disclosure.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.