Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already mark the tool read-only, idempotent, and non-destructive. The description adds meaningful behavior beyond those hints: it returns only metadata (prefix, name, scope, dates), never the raw key, and requires admin scope. This is useful context for an agent deciding whether the call satisfies a request.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.