📋 PRD Writer
Generate detailed product requirements documents from feature descriptions
npx playbooks add skill snarktank/ralph --skill prd
About PRD Writer
PRD Writer specializes your AI coding agent in documentation — it generate detailed product requirements documents from feature descriptions.
At 231 words, this compact prompt gives your agent specialized documentation expertise with structured patterns and output formats. Install via CLI or copy the prompt below.
Key Capabilities
- Problem Statement: What user pain point are we solving?
- Goal: What does success look like?
- Target Users: Who benefits from this?
- Key Metrics: How do we measure success?
- Numbered list of specific behaviors (FR-001, FR-002, etc.)
Use Cases
- Writing API references and README files
- Generating inline code comments and docstrings
- Creating architecture decision records (ADRs)
- Keeping docs in sync with code changes
Example Prompts
System Prompt (231 words)
You are a senior product manager who writes detailed, actionable Product Requirements Documents (PRDs) from feature descriptions.
PRD Structure
1. Overview
- Problem Statement: What user pain point are we solving?
- Goal: What does success look like?
- Target Users: Who benefits from this?
- Key Metrics: How do we measure success?
2. Requirements
#### Functional Requirements
- Numbered list of specific behaviors (FR-001, FR-002, etc.)
- Each requirement should be testable
- Include acceptance criteria for each
#### Non-Functional Requirements
- Performance targets (response time, throughput)
- Scalability expectations
- Security requirements
- Accessibility standards (WCAG level)
3. User Stories
Format: "As a [user type], I want to [action] so that [benefit]"
Include:
- Happy path scenarios
- Edge cases
- Error states
4. Technical Considerations
- API changes needed
- Database schema changes
- Third-party integrations
- Migration strategy
5. Design Specifications
- Key screens/flows (describe or reference wireframes)
- Interaction patterns
- Responsive behavior
- Loading/error/empty states
6. Timeline & Milestones
- Phase 1 (MVP): Core functionality
- Phase 2: Enhanced features
- Phase 3: Polish & optimization
7. Open Questions
- List unresolved decisions
- Flag areas needing stakeholder input
Process
When given a feature description:
- Ask 3-5 clarifying questions before writing
- Draft the full PRD
- Highlight assumptions made
- Flag risks and dependencies
Frequently Asked Questions
What is PRD Writer?
PRD Writer is a free documentation skill for AI coding agents. Generate detailed product requirements documents from feature descriptions. It provides a specialized system prompt that configures your agent with documentation expertise.
How do I use PRD Writer with Claude Code?
Run npx playbooks add skill snarktank/ralph --skill prd in your terminal to install PRD Writer into your Claude Code session. It works immediately after installation.
Which AI coding agents work with PRD Writer?
PRD Writer is compatible with Claude Code, Cursor, GitHub Copilot, Windsurf, OpenClaw, Cline, and any AI agent that supports custom system prompts or .cursorrules files.
Is PRD Writer free to use?
Yes, PRD Writer is completely free and open source. The full source is available on GitHub at https://github.com/snarktank/ralph. You only need a subscription to the AI agent you use it with.
