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 does reveal that the action won't take effect immediately, which is valuable, and implies a manual verification step by the owner. However, it does not disclose whether this is a mutation, whether it modifies or creates records, whether it is reversible, or what the side effects are. The transparency is partial at best.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.