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 communicates that the operation deletes exactly one item, which implies destructiveness, but it does not mention whether the deletion is irreversible, requires special permissions, cascades, or returns any confirmation. This is minimally informative but not zero.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.