Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the behavioral disclosure burden. It discloses authentication/permission requirements, identifies the return content, and notes that the response may include a step only the person can do. The read-only nature is conveyed by the title and the word 'Returns', though error or not-found behavior is not discussed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.