Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations indicate openWorldHint=false and destructiveHint=false, so the description does not need to restate safety. It adds context about the return structure and ordering dependencies, which is valuable beyond annotations. Minor gap: it doesn't describe failure modes or state-specific validation, but this is acceptable given annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.