Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. It implies a read operation ('Get') and that authentication is needed ('for the authenticated user'), but lacks details on idempotency, permissions, error conditions, or rate limits. Adequate for a simple getter but minimal.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.