Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries full responsibility for behavioral disclosure. It says 'Return', implying a read-only operation, but does not explicitly state that it is safe or non-mutating. It also does not mention potential size, latency, or error behavior. The reference to a rule about truth authority is content, not tool behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.