Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already disclose this is a non-read-only, non-destructive, closed-world operation, so the bar is lower. The description still adds real behavior: the page is created empty and no agent is involved, telling the agent this is a blank scaffold it must fill itself rather than a generative call. It omits what is returned (page id/handle) or any failure/idempotency behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.