Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the transparency burden. It discloses the return content (workspace names, IDs, access levels) and implies a read-only list operation. It does not detail potential side effects, rate limits, or error behavior, but for a simple list tool with no parameters, this is reasonably transparent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.