Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false and openWorldHint=true, so the mutating, externally-visible nature is partly covered. The description adds nothing beyond the word 'Remove' — no reversibility, idempotency, permission requirement, or effect on the member's other data is disclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.