Software development is undergoing a transformative shift from manual coding to the orchestration of AI agents, with productivity increasingly measured by the "time between disengagements" of these agents. This paradigm shift calls for developers to transition from a code-centric mindset to one of a "software conductor," coordinating multiple AI agents capable of executing complex tasks autonomously. To maximize agent autonomy and effectiveness, developers should craft detailed "agent PRDs" (Product Requirements Documents) that outline goals, current implementations, proposed solutions, and step-by-step implementation plans. Such structured guidance enhances the agents' ability to work independently, reducing the need for constant human intervention and allowing for parallelism in software engineering. The guide emphasizes the importance of using automated development environments to foster agent autonomy and security, thereby preparing developers for a future where fleets of AI agents operate in tandem, significantly enhancing productivity and scalability in software projects.