Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=false, so safety and determinism are covered. The description adds that the response includes status and amounts, but says nothing about behavior when the ID is unknown or about object relationships (e.g. preview_id linkage).
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.