What problem does it solve? Turning a raw product idea into a PRD that engineers can actually plan milestones from is hard: problems get asserted without evidence, metrics are unmeasurable, NFRs stay vague, and scope creeps without an MVP boundary. This Skill supplies the authoring method that fills a PRD template with grounded, decision-complete content. ## Core Features & Use Cases - Evidence-grounded method: Frames the problem as a job-to-be-done backed by research, defines 2-4 measurable success metrics with guardrails, and draws a defensible MVP boundary with explicit non-goals. - NFR taxonomy with numeric targets: Covers performance, availability, security, accessibility (WCAG 2.2 AA), and more, each with checkable targets proportional to the product archetype. - Versioned amendments: Edits an existing PRD in place as a versioned delta with changelog, superseded-content marking, and ripple analysis instead of silent rewrites. - Use Case: Hand the agent a product idea for a freelancer invoicing tool; it researches the domain, fills the PRD template with an evidenced problem, measurable metrics, traceable features with acceptance criteria, and a 12-condition self-check before handoff. ## Quick Start Use authoring-prd to turn my product idea for a freelancer invoicing tool into a comprehensive PRD an engineer can plan milestones from.