Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full behavioral burden. It conveys that the operation is a query/read, which implies non-mutating behavior, and scopes the query to 'currently active workspaces' in the local IDE. It does not mention error cases, whether it contacts a remote service, or how 'active' is determined, but for a parameterless query tool the description 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.