Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description must carry the full behavioral burden. It only says the tool returns generated decisions; it does not disclose whether the call has side effects, how the decision categories are derived, whether this is read-only, or how the output schema relates to the decision value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.