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 covers auth requirements ('No auth required'), rate limits, return values, parameter precedence ('Takes precedence over jurisdiction'), result caps ('Capped at 25'), and default behavior—all beyond what a bare schema would provide.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.