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 states content is moved but does not explain what happens to the source page afterward, whether the operation is destructive, or whether content is appended or replaced in the target. These are significant side effects for a merge operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.