Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It states that the tool returns size, blob count, and last activity, which conveys a read-only nature and the kind of data to expect. However, it does not mention error behavior, such as what happens if the namespace_id is invalid or not found, nor does it explicitly state that the operation is read-only.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.