Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of disclosing behavior. It clearly states the destructive action ('Delete') and the HTTP method, which is transparent at a basic level. However, it does not mention whether deletion is permanent, irreversible, or whether it affects related resources like contacts or campaigns.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.