Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden. It discloses the returned content but does not mention side effects, authentication, or failure modes. However, as a read-only metadata tool, the description is minimally adequate but could be more explicit about the return format.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.