Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the safe read-only behavior is covered. The description adds the 'mandatory' and 'educational / non-advice' framing but does not disclose additional behavioral details such as output structure or side effects, which are partially covered by the output schema.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.