Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry behavioral disclosure. It clearly warns that deletion is permanent ('cannot be undone') and cascades to associated data, which is the critical behavioral trait for a delete tool. It does not address authentication or return values, but the core destructive behavior is well-covered.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.