Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description is the sole source of behavioral context. It conveys that this is a read-only list operation, but does not disclose potential details like pagination, sorting, access permissions, or whether archived folders are included. This is adequate for a simple list but lacks depth.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.