Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations declare readOnlyHint=false, destructiveHint=false, idempotentHint=false, and openWorldHint=true, but not the async lifecycle. The description usefully adds that the operation queues work and returns either a durable task or a job ID depending on client type, plus the webhook completion signal. This is meaningful behavioral context beyond the structured fields.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.