Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the burden. It conveys that this is an inspection/metadata tool with no inputs and enumerates expected output attributes, which implies a read-only lookup. It does not explicitly state a return format, authorization requirements, or error behavior, but the simple, zero-parameter nature limits the severity.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.