Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of disclosure. It only states 'List', implying a read-only operation, but gives no additional context about permissions, output characteristics, or potential side effects. Minimal beyond what the verb itself conveys.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.