Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description must carry the burden. It clearly states the core behavior: logging out the current user. It adds nuance with 'currently authenticated', implying that it operates on an existing session. However, it does not disclose edge cases (e.g., what happens if no user is logged in) or whether tokens are invalidated, though these are not critical for such a simple operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.