Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It usefully discloses that nested subfolders are included, which is a behavioral detail beyond the schema. However, it omits read-only/safety context, permission requirements, and return format expectations for a list operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.