Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It simply says 'Get participants' with no mention of read-only guarantees, potential side effects, authorization requirements, return format, or error behavior. The only implied trait is that it is a read operation, but this is not explicitly stated.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.