Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. The verb 'List' clearly indicates a read-only operation, which is useful. However, it does not disclose details such as whether composite roles are included, pagination behavior, or the response structure. For a simple list operation, the basic transparency is adequate, but richer context would improve it.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.