Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral disclosure burden. 'Delete' clearly signals a destructive operation and the key list indicates what subset of metadata is affected. It does not disclose irreversibility, error behavior, or whether deletion requires specific order status or permissions, though for this simple delete the core behavior is apparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.