PRD Skill

Create and manage Product Requirements Documents (PRDs) for feature planning.

What is a PRD?

A PRD (Product Requirements Document) is a structured specification that:

1. Breaks a feature into small, independent user stories
2. Defines verifiable acceptance criteria for each story
3. Orders tasks by dependency (schema → backend → UI)

Quick Start

1. Create/edit agents/prd.json in the project
2. Define user stories with acceptance criteria
3. Track progress by updating passes: false → true

prd.json Format

{
  "project": "MyApp",
  "branchName": "ralph/feature-name",
  "description": "Short description of the feature",
  "userStories": [
    {
      "id": "US-001",
      "title": "Add priority field to database",
      "description": "As a developer, I need to store task priority.",
      "acceptanceCriteria": [
        "Add priority column: 'high' | 'medium' | 'low'",
        "Generate and run migration",
        "Typecheck passes"
      ],
      "priority": 1,
      "passes": false,
      "notes": ""
    }
  ]
}

Field Descriptions

| Field | Description | |-------|-------------| | project | Project name for context | | branchName | Git branch for this feature (prefix with ralph/) | | description | One-line feature summary | | userStories | List of stories to complete | | userStories[].id | Unique identifier (US-001, US-002) | | userStories[].title | Short descriptive title | | userStories[].description | "As a [user], I want [feature] so that [benefit]" | | userStories[].acceptanceCriteria | Verifiable checklist items | | userStories[].priority | Execution order (1 = first) | | userStories[].passes | Completion status (false → true when done) | | userStories[].notes | Runtime notes added by agent |

Story Sizing

Each story should be completable in one context window.

✅ Right-sized:

• Add a database column and migration
• Add a UI component to an existing page
• Update a server action with new logic
• Add a filter dropdown to a list

❌ Too large (split these):

• "Build the entire dashboard" → Split into: schema, queries, UI, filters
• "Add authentication" → Split into: schema, middleware, login UI, session

Story Ordering

Stories execute in priority order. Earlier stories must NOT depend on later ones.

Correct order:

1. Schema/database changes (migrations)
2. Server actions / backend logic
3. UI components that use the backend
4. Dashboard/summary views

Acceptance Criteria

Must be verifiable, not vague.

✅ Good:

• "Add status column to tasks table with default 'pending'"
• "Filter dropdown has options: All, Active, Completed"
• "Typecheck passes"

❌ Bad:

• "Works correctly"
• "User can do X easily"

Always include: "Typecheck passes"

Progress Tracking

Update passes: true when a story is complete. Use notes field for runtime observations:

"notes": "Used IF NOT EXISTS for migrations"

Quick Reference

| Action | Command | |--------|---------| | Create PRD | Save to agents/prd.json | | Check status | cat prd.json | jq '.userStories[] | {id, passes}' | | View incomplete | jq '.userStories[] | select(.passes == false)' prd.json |

Resources

See references/ for detailed documentation:

• agent-usage.md - How AI agents execute PRDs (Claude Code, OpenCode, etc.)
• workflows.md - Sequential workflow patterns
• output-patterns.md - Templates and examples