Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full behavioral burden and falls short. It does not say that this is a mutating, effectively destructive operation, whether removals are reversible, what permissions are required, or what happens if a listed participant is not in the group. For an opaque 2-parameter mutation tool this is a meaningful disclosure gap.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.