Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already cover readOnlyHint, idempotentHint, and destructiveHint, so the description does not need to repeat safety traits. The word 'deterministically' adds a small behavioral guarantee, but it is largely aligned with the existing idempotence hint and no other behavioral details (e.g., markdown dialect, sanitization) are disclosed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.