Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With annotations providing idempotentHint=true, destructiveHint=false, and readOnlyHint=false, the description adds the important return-value nuance ('single scalar status, not a per-order array'). This helps prevent the agent from expecting an array, adding behavioral context beyond annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.