Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description must carry the full burden of behavioral disclosure. It only states 'check' implying a read-only operation, but does not describe what the response contains, whether authentication is needed, or any side effects. This is a significant gap for a tool that checks API key status.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.