Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure, but it only says 'Get memory usage information' without stating whether it is read-only, what data is returned (RAM, swap, per-process), or whether any permissions are required. It is not misleading, but it is behaviorally thin.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.