Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The annotations already provide readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is well covered. The description adds only modest behavioral context beyond annotations, such as the signed nature of the receipt and the explicit no-state-change guarantee, but does not disclose additional traits like exact response semantics (covered by output schema) or failure modes.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.