Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry full behavioral disclosure. It explains the semantics of 'to' (highest height, defaults to current tip, can be lowered) and the range for 'limit', but it does not describe the return value structure, ordering, or how orphan blocks are identified. This leaves significant ambiguity for an agent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.