Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are present, so the description must carry the full burden. It only states the action and placement, but does not disclose whether the cell's content, outputs, or configuration are copied, whether a new cell ID is generated, or whether special permissions are needed. It also doesn't mention if the original is unaffected, though that is implied by 'duplicate'.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.