williamlimasilva/prd

Product Requirements Document (PRD)

Overview

Design comprehensive, production-grade Product Requirements Documents (PRDs) that bridge the gap between business vision and technical execution. This skill works for modern software systems, ensuring that requirements are clearly defined.

When to Use

Use this skill when:

• Starting a new product or feature development cycle
• Translating a vague idea into a concrete technical specification
• Defining requirements for AI-powered features
• Stakeholders need a unified "source of truth" for project scope
• User asks to "write a PRD", "document requirements", or "plan a feature"

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Operational Workflow

Phase 1: Discovery (The Interview)

Before writing a single line of the PRD, you MUST interrogate the user to fill knowledge gaps. Do not assume context.

Ask about:

• The Core Problem: Why are we building this now?
• Success Metrics: How do we know it worked?
• Constraints: Budget, tech stack, or deadline?

Phase 2: Analysis & Scoping

Synthesize the user's input. Identify dependencies and hidden complexities.

• Map out the User Flow.
• Define Non-Goals to protect the timeline.

Phase 3: Technical Drafting

Generate the document using the Strict PRD Schema below.

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PRD Quality Standards

Requirements Quality

Use concrete, measurable criteria. Avoid "fast", "easy", or "intuitive".

# Vague (BAD)
- The search should be fast and return relevant results.
- The UI must look modern and be easy to use.

# Concrete (GOOD)
+ The search must return results within 200ms for a 10k record dataset.
+ The search algorithm must achieve >= 85% Precision@10 in benchmark evals.
+ The UI must follow the 'Vercel/Next.js' design system and achieve 100% Lighthouse Accessibility score.

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Strict PRD Schema

You MUST follow this exact structure for the output:

1. Executive Summary

• Problem Statement: 1-2 sentences on the pain point.
• Proposed Solution: 1-2 sentences on the fix.
• Success Criteria: 3-5 measurable KPIs.

2. User Experience & Functionality

• User Personas: Who is this for?
• User Stories: As a [user], I want to [action] so that [benefit].
• Acceptance Criteria: Bulleted list of "Done" definitions for each story.
• Non-Goals: What are we NOT building?

3. AI System Requirements (If Applicable)

• Tool Requirements: What tools and APIs are needed?
• Evaluation Strategy: How to measure output quality and accuracy.

4. Technical Specifications

• Architecture Overview: Data flow and component interaction.
• Integration Points: APIs, DBs, and Auth.
• Security & Privacy: Data handling and compliance.

5. Risks & Roadmap

• Phased Rollout: MVP -> v1.1 -> v2.0.
• Technical Risks: Latency, cost, or dependency failures.

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Implementation Guidelines

DO (Always)

• Define Testing: For AI systems, specify how to test and validate output quality.
• Iterate: Present a draft and ask for feedback on specific sections.

DON'T (Avoid)

• Skip Discovery: Never write a PRD without asking at least 2 clarifying questions first.
• Hallucinate Constraints: If the user didn't specify a tech stack, ask or label it as TBD.

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Example: Intelligent Search System

1. Executive Summary

Problem: Users struggle to find specific documentation snippets in massive repositories. Solution: An intelligent search system that provides direct answers with source citations. Success:

• Reduce search time by 50%.
• Citation accuracy >= 95%.

2. User Stories

• Story: As a developer, I want to ask natural language questions so I don't have to guess keywords.
• AC:
  • Supports multi-turn clarification.
  • Returns code blocks with "Copy" button.

3. AI System Architecture

• Tools Required: codesearch, grep, webfetch.

4. Evaluation

• Benchmark: Test with 50 common developer questions.
• Pass Rate: 90% must match expected citations.