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 explicitly states that files are deleted 'from disk', making the destructive nature clear, but it omits any mention of irreversibility, partial failure behavior, or permission requirements that would be valuable for a destructive operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.