An assistant must check order status through an API and, when authorized, request a return through a separate tool. Which capability distinguishes this workflow from a model that only drafts text responses?

1. An embedding vector whose numerical values automatically submit the return request.
2. A longer generated paragraph that merely says the return has been requested without calling the return system.
3. Agent orchestration that selects and invokes authorized tools and uses their results to progress toward the user goal.
4. A larger context window with no tool or application integration.