Add PRD generation workflow for Ralph Loop

[Copilot]

Ralph Loop requires structured PRD files with atomic user stories. This adds a workflow that generates Ralph-compatible prd.json from feature descriptions.

Workflow: ralph-prd-generator

Inputs:

• feature_description (required): Feature requirements in natural language
• branch_name (optional): Target branch name

Output:
Creates PR with prd.json containing:

{
  "feature": "Task Management System",
  "branchName": "add-task-management-system",
  "userStories": [
    {
      "id": 1,
      "title": "Create Task data model and context",
      "description": "Define TypeScript interface...",
      "acceptanceCriteria": [
        "Task interface includes id, title, description, priority",
        "TaskContext provides state and actions"
      ],
      "passes": false
    }
  ]
}

The workflow prompt enforces:

• Atomic stories (1-2 hours each, single focus)
• 2-4 testable acceptance criteria per story
• Sequential IDs starting from 1
• kebab-case branch naming

Examples

examples/ralph/prd-samples/ contains:

• feature-example.md: Task management feature with technical context
• prd-output.json: 8-story PRD demonstrating proper decomposition
• README.md: Format specification and best practices

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[plan] Add PRD generation workflow for Ralph Loop</issue_title>
<issue_description>## Objective

Create a workflow that generates a structured PRD (Product Requirements Document) in JSON format, similar to Ralph's prd.json.

Context

Ralph uses a skill to convert markdown PRDs into structured JSON with user stories. We need a workflow that takes a feature description and generates a PRD suitable for the Ralph Loop workflow.

Approach

1. Create .github/workflows/ralph-prd-generator.md that:

   • Takes a feature description as input
   • Uses AI engine to generate structured PRD
   • Asks clarifying questions if needed
   • Outputs prd.json with user stories format:

     {
       "feature": "...",
       "branchName": "...",
       "userStories": [
         {
           "id": 1,
           "title": "...",
           "description": "...",
           "acceptanceCriteria": [],
           "passes": false
         }
       ]
     }

2. Include validation to ensure tasks are small and atomic

3. Add examples in examples/ralph/prd-samples/

Files to Create

• .github/workflows/ralph-prd-generator.md - PRD generation workflow
• examples/ralph/prd-samples/feature-example.md - Sample input
• examples/ralph/prd-samples/prd-output.json - Sample output

Acceptance Criteria

• Workflow generates structured PRD from description
• PRD includes properly formatted user stories
• Each story has title, description, criteria, and passes flag
• Workflow validates stories are appropriately sized
• Examples demonstrate various feature types
  Related to Add Ralph Loop examples for agentic workflows #11132

AI generated by Plan Command for #11132

Comments on the Issue (you are @copilot in this section)

• Fixes [plan] Add PRD generation workflow for Ralph Loop #11136

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