Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations present, the description carries the behavioral transparency burden. It adds only the claim '(safe)', which is useful for a GET-based tool, but it does not explain API_BASE resolution, response behavior, error handling, or whether authentication is required.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.