Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, openWorldHint=true and idempotentHint=false, so the safety profile is partly known. The description adds only the body-format requirement and says nothing about permissions required, what happens if the title already exists, how parentId affects placement, or what is returned (page id), which matters for a non-idempotent write.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.