Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are present, so the description carries the disclosure burden. It reveals the city fallback behavior but does not explicitly state whether the operation is read-only, whether a valid session must exist, or what happens if session.city is absent. The output schema covers return structure, but side effects and preconditions remain under-specified.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.