Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond the annotations, the description discloses that this creates a new session when a prior one is incomplete, denied, or expired, and that it returns a secure hosted verification URL for the user's browser. It also adds important privacy guidance not to collect sensitive identity details in chat, though it does not cover rate limits or permission requirements.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.