Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish that this is read-only, non-destructive, and closed-world, and the description adds useful behavioral context: it returns a canonical record plus related data, and it explains URL alias semantics including a permanent 301 redirect. It does not cover pagination, response size, or error behavior, so it is strong but not fully exhaustive.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.