Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=false, destructiveHint=false, idempotentHint=false and openWorldHint=true, so the safety profile is covered by structured data. The description adds no behavioral context of its own — nothing about what fields are mutably updated, partial-merge semantics, permissions, or consequences of omitted fields. No contradiction, but zero 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.