Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It explains that the tool returns a URL for browser opening, requires interactive consent, and produces a one-time code. This is valuable context, though it omits potential error conditions or expiration behavior.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.