Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description alone must disclose behavior. It states the basic mutation ('Duplicate an entire page') but does not mention side effects, such as whether child content is copied, where the duplicate is placed, or whether an existing page is modified. It also does not clarify permissions or reversibility.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.