Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full disclosure burden. It does add genuinely useful behavior: the special ["all"] argument performs a bulk wipe of every shape, which an agent must know before calling. However, it is silent on undo/irreversibility, behavior when a name is not found, and what happens when the optional layer argument is omitted (the active layer?).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.