Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden. It discloses that deletion affects members (they become unassigned but not deleted), which is valuable behavioral context. However, it doesn't mention permissions needed, whether deletion is reversible, error conditions, or what happens to other party-associated data like quests or inventory.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.