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 the operation deletes 'all its objects,' which is a key destructive side-effect. However, it does not mention irreversibility, whether confirmation is required, or what happens if the layer is current, locked, or referenced elsewhere. This is a minimal but honest disclosure, so a 3 is appropriate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.