| name | prp-generator |
| description | Generate comprehensive Product Requirement Plans (PRPs) for feature implementation with thorough codebase analysis and external research. Use when the user requests a PRP, PRD, or detailed implementation plan for a new feature. Conducts systematic research, identifies patterns, and creates executable validation gates for one-pass implementation success. Do NOT use for client discovery, requirements gathering, or scope definition - use scope-clarifier for those. |
| context | fork |
| agent | Plan |
PRP Generator
Overview
Generates comprehensive Product Requirement Plans (PRPs) that enable AI agents to implement features in a single pass. Combines systematic codebase analysis with external research to create detailed, context-rich implementation blueprints.
When to Use
- User requests a PRP, PRD, or detailed implementation plan
- User asks to "plan out" or "design" a complex feature
- Beginning significant feature development that benefits from structured planning
- User provides a feature description file and asks for implementation guidance
Core Principle
Context is Everything: The implementing agent only receives the PRP content, training data knowledge, codebase access, and WebSearch. Your PRP must be self-contained with all necessary context, specific references, and executable validation gates.
Workflow
Phase 1: Understand the Feature
- Read the feature request - if a file path is given, read it completely; if verbal, clarify requirements
- Clarify ambiguities - use AskUserQuestion for unclear requirements, confirm tech stack, verify integration points
- Identify the core problem being solved and acceptance criteria
Phase 2: Codebase Analysis (Mandatory)
Goal: Understand existing patterns, conventions, and integration points.
Systematically analyse the codebase across five dimensions:
| Area | What to Capture |
|---|
| Similar features | File paths, line numbers, code snippets, adaptations needed |
| Architecture | Directory conventions, component organisation, state management, API patterns |
| Coding conventions | TypeScript usage, component patterns, styling, import ordering, naming |
| Test patterns | Framework, file naming, mock strategies, coverage expectations |
| Configuration | Dependencies, build setup, path aliases, TypeScript settings |
For detailed sub-steps, examples, and documentation templates, see references/codebase-analysis-guide.md.
Also refer to references/research_methodology.md for the full research process.
Phase 3: External Research (Mandatory)
Goal: Find best practices, documentation, examples, and gotchas.
Research across four areas:
| Area | Key Actions |
|---|
| Library documentation | Find official docs for the SPECIFIC version from package.json; note version-specific gotchas |
| Implementation examples | Search GitHub, StackOverflow, official examples; prefer recent, production-grade code |
| Best practices | Search "[technology] best practices [current year]"; check OWASP for security |
| Performance and security | Bundle size implications, runtime patterns, vulnerabilities, accessibility |
Always document exact URLs, versions, and specific sections. See references/research_methodology.md for detailed guidance.
Phase 4: Ultra-Thinking (Critical)
STOP AND THINK DEEPLY BEFORE WRITING THE PRP.
Analyse integration points, implementation ordering, validation strategy, and context completeness. Verify the PRP will enable one-pass implementation without questions.
For the full set of analysis questions and the quality checklist, see references/quality-assessment.md.
Phase 5: Generate the PRP
Use assets/prp_template.md as the base structure. Populate all sections:
- Metadata - feature name, timeline, confidence score (1-10), date
- Executive Summary - 2-3 sentences with core value proposition
- Research Findings - codebase analysis (file:line refs) and external research (URLs, versions)
- Technical Specification - architecture, components, data models, API endpoints
- Implementation Blueprint - prerequisites, step-by-step with pseudocode, file changes, error handling, edge cases
- Testing Strategy - unit, integration, and manual testing approaches
- Validation Gates - must be EXECUTABLE commands (e.g.
npm run test && npm run build)
- Success Criteria - clear, measurable checklist
Phase 6: Quality Scoring
Score the PRP for one-pass implementation success:
| Score | Meaning |
|---|
| 9-10 | Exceptionally detailed, all context included, clear path, executable gates |
| 7-8 | Very good, minor gaps, mostly clear implementation path |
| 5-6 | Adequate, some ambiguity, may require clarification |
| 3-4 | Incomplete research, missing context, unclear path |
| 1-2 | Insufficient for implementation |
If score is below 7: Go back and improve the PRP before delivering.
Phase 7: Save and Deliver
- Save the PRP to
PRPs/[feature-name].md (kebab-case, create directory if needed)
- Deliver summary to user with: brief feature summary, file location, confidence score with rationale, and next steps
Common Pitfalls
| Pitfall | Bad | Good |
|---|
| Vague references | "There's a similar component somewhere" | "See UserProfile at src/components/UserProfile.tsx:45-67" |
| Missing versions | "Use React Query" | "Use @tanstack/react-query v5.28.0" |
| Non-executable gates | "Run tests and make sure they pass" | npm run test && npm run build |
| Generic advice | "Follow React best practices" | "Use named exports (see src/components/Button.tsx:1)" |
| Incomplete research | Skipping codebase analysis | Thoroughly document existing patterns |
| Missing gotchas | Assuming smooth implementation | Document known issues and edge cases |
Example Usage
User: "Create a PRP for adding dark mode support to the application"
- Clarify: "Should dark mode preference persist across sessions? Should it respect system preferences?"
- Research codebase for theme-related code
- Research external resources (dark mode best practices, library options)
- Ultra-think about implementation approach
- Generate comprehensive PRP using template
- Score the PRP
- Save to
PRPs/dark-mode-support.md
- Deliver summary with confidence score
Resources
Key Reminders
- Research is mandatory - never skip codebase or external research
- Be specific - always include file paths, line numbers, URLs, versions
- Think deeply - Phase 4 (Ultra-Thinking) is critical for success
- Validate everything - all validation gates must be executable
- Score honestly - if confidence is below 7, improve the PRP
- Context is king - the implementer only has what you put in the PRP
