Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description discloses key behavioral traits: it starts a login process, returns a sessionRequestId and loginUrl, and requires polling. It does not contradict annotations, and since annotations provide no safety hints, the description carries the full burden effectively.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.