Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the agent knows this is a destructive, repeatable write. The description adds only the REST endpoint mapping; it says nothing about whether the removed user's tasks, schedules, or permissions are reassigned or lost. With annotations carrying the safety profile, a 3 is appropriate.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.