Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full responsibility for behavioral disclosure. It only says 'Get reusable blocks' with no mention of return format, pagination, filtering, ordering, or any side effects. This is insufficient for an agent to know what to expect or what it can do with the result.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.