Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare readOnlyHint=true and openWorldHint=false, so safety is covered. The description adds a useful scoping note that possession is 5v5 only and states a cost (5 credits), which is real behavioral context. However, it doesn't mention caching, rate limits, or season/league default behavior beyond what the schema says.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.