Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full behavioral disclosure burden, but it adds little beyond the schema. The DELETE method and "Requires confirm: true" echo information already present in the schema (the confirm property describes this as a destructive action). It does not disclose irreversibility, permissions needed, side effects, or what happens to related data, leaving significant behavioral ambiguity.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.