Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Without annotations, the description carries the full burden. It implies a read-only operation but does not disclose any behavioral traits such as pagination, sorting, or whether it includes archived workspaces. The description is minimal but acceptable for a simple 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.