Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry behavioral transparency. It identifies the operation as 'Get' (implying a read), but does not disclose whether the URL expires, whether authentication is needed, or any side effects. This is minimal and adds little beyond the tool name.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.