Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover read-only, idempotent, non-destructive behavior. The description adds useful behavioral context by clarifying the tool returns the full procedure body and should be treated as an instruction source rather than a reference lookup. It does not disclose error behavior, but the output schema mitigates the need for return-detail disclosure.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.