Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already establish readOnlyHint=true and openWorldHint=true. The description adds useful behavioral context about what the standings include: humans plus registered AI agents, ranking by total points, and separate skill points, though it does not discuss pagination or return ordering beyond rank.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.