Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden for a destructive operation. It discloses what is removed (guide layers) and that the scope is the entire stack, but says nothing about whether the removal is undoable, what happens to guides inside groups or nested layers, or what the result is when no guides exist.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.