Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the behavioral disclosure burden. It communicates that the action is a read-only identity check via the verb '확인한다', but it does not state side effects, error behavior on invalid PAT, or return format. The description is sufficient for a trivial whoami tool but adds little beyond the purpose.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.