Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden; it does disclose the key state transition (winner remains active, loser becomes superseded) rather than deleted, which is real value. It omits reversibility, permission/auth requirements, and failure behavior for already-superseded or missing records.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.