We think of agents as systems that can complete tasks and act in a range of digital and physical environments on behalf of the user. Today, such agents are still in an early stage. The Nova Act SDK is a crucial step forward, toward building reliable agents by enabling developers to break down complex workflows into atomic commands (e.g., search, checkout, answer questions about the screen). It also enables developers to add more detailed instructions to those commands where needed (e.g., “don’t accept the insurance upsell”), call APIs, and more to further strengthen reliability.