PDD (Prompt Driven Development) treats prompts as first-class artifacts — not throwaway inputs. It gives Claude nine structured workflows to scaffold projects, write persistent context, search for existing solutions, plan implementations, generate versioned prompts, review AI-generated output with automated quality checks, and evaluate prompt reliability over time. Supports 16 project types (frontend, backend, mobile, ML, DevOps, blockchain, robotics, and more) with tailored conventions and review checklists for each.