Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, readOnlyHint=false, idempotentHint=false, and openWorldHint=true, so the safety profile is covered structurally. The description adds nothing beyond 'remove' — no note on whether removal is reversible, whether re-adding is possible, what permissions are needed, or what happens to the member's assignments.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.