Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Behavior is well exposed beyond annotations: the tool is asynchronous, returns a sessionId, takes 1–3 minutes, must be polled every 10 seconds, consumes one plan credit, and behaves in a documented way without an API key. This addresses side effects, quota usage, and failure edge cases.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.