Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, so the description is not burdened with those. It adds the behavioral nuance that results depend on publish and auth settings, which is useful context beyond the schema, but it does not mention error conditions or output structure. This is moderate added value.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.