Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations exist, so the description carries the full burden. 'Get' implies a read-only operation and the score range/letter grade hints at the return payload, but it says nothing about what 'health' measures, whether it requires an active session, cost, or what happens when no session exists.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.