Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations available, the description must fully disclose behavioral traits. It only states 'Read-only', which is a useful safety hint, but omits other important behavior such as whether userId is required, what happens if no groups exist, or any permission requirements. The description carries a heavy burden and fails to provide enough detail.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.