Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the burden of behavioral disclosure. It states only the action 'List' with no details on return format, authentication needs, permissions, or whether the listing includes subfolders. It does not contradict any annotations (since none exist), but it fails to reveal important behavioral characteristics beyond the minimal action.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.