Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden and does provide a key behavioral trait beyond the tool name: 'Robot itself stays open'. This clarifies that the operation does not terminate the application. However, it does not mention the potential loss of unsaved changes, which is a notable omission for a close operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.