Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral burden. It usefully discloses irreversibility via 'Permanently delete,' which is the single most important trait for a destructive tool, but says nothing about required permissions, behavior on a nonexistent id, or whether any confirmation/soft-delete path exists.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.