Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Since no annotations are provided, the description carries the full burden. It discloses a key behavioral trait: 'No auth required', which is useful for an agent to know before invoking. It also implicitly indicates a read-only operation (getting version info), and the description is transparent about the expected output (version and build date).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.