Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden of disclosing behavior. It states the tool checks connection status and returns version information, implying a safe, read-only operation. While it does not explicitly mention side effects (or lack thereof), the nature of a health test is clear enough for an agent.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.