Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It indicates a read-only operation ('Get balance') and no destructive behavior. However, it does not mention any limitations such as rate limits or address validation, but for a simple balance check, the provided information is adequate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.