Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the burden of disclosing behavior. 'List' clearly signals a read-only operation and 'in an account' establishes scope, but the description does not mention response shape, pagination, or authentication requirements. For a simple account-level list tool, this is adequate but not richly transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.