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 only says 'move items to bin', which is a terse statement of intent. It does not mention side effects (e.g., whether the move is destructive to original positioning, whether a specific bin is always used, permissions, or return values). The word 'expanded' hints at additional behavior but is not specific.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.