Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the full burden of behavioral disclosure. It only says 'List all components' and does not disclose return format, pagination, whether nested components are included, or any side effects (though listing implies read-only). This is minimal and lacks context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.