Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
While annotations already indicate mutation and non-idempotence, the description adds meaningful context: the one-time supersede limit, the already_recorded error on a second attestation, authorization requirement, and conditional routing to order_dispute. This goes well beyond the structured annotation hints.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.