Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden for behavioral disclosure. It simply says 'Delete a file' and does not mention whether deletion is permanent, irreversible, permission-gated, or destructive to any related state. For a destructive operation, more transparency is required.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.