Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
The description discloses important behavior beyond the annotations: it queues work asynchronously, does not imply completion, requires explicit user confirmation, and does not send anything through the provider. These are non-obvious traits that help an agent avoid incorrect assumptions about a sync operation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.