Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations cover read-only, non-destructive, idempotent, and open-world hints, so the agent knows it's a safe, repeatable query. The description adds minimal context with 'POST', but this doesn't contradict annotations—it's a neutral addition. However, it lacks details like rate limits or authentication needs, offering little beyond annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.