Agent Skills: OpenSpec to Prompts Pipeline

OpenSpec to Prompts Pipeline

Transform an OpenSpec change phase into actionable UI build prompts through a structured 3-step process.

Overview

This skill orchestrates three sub-skills in sequence:

OpenSpec Phase → [prd-lite + prd-clarifier] → [prd-to-ux] → [ux-spec-to-prompts] → Build Prompts

Input: OpenSpec change-id and phase number Output: Three documents ready for UI generation tools

When to Use

• Starting implementation of an OpenSpec feature phase
• Converting spec requirements into UI build prompts
• User says "run the feature pipeline" or "openspec-to-prompts"
• User wants to prepare a phase for frontend development

Required Inputs

Before starting, confirm these inputs with the user:

| Input | Description | Example | |-------|-------------|---------| | change-id | OpenSpec change directory name | add-launch-features | | phase | Section number from tasks.md | 1 (for "1. Pocket Import") |

Pipeline Execution

Pre-Flight: Gather Context

Before running the pipeline, read and understand:

1. Tasks file: openspec/changes/{change-id}/tasks.md

   • Extract the specific phase section (e.g., "## 1. Pocket Import")
   • Note all sub-tasks and requirements

2. Proposal file: openspec/changes/{change-id}/proposal.md

   • Understand the "Why" and context
   • Note any constraints or dependencies

3. Spec files: openspec/changes/{change-id}/specs/{capability}/spec.md

   • Read relevant capability specs
   • Extract scenarios and requirements

Create a summary of the phase for use in Step 1.

Step 1: PRD Generation + Clarification

Invoke: prd-lite skill, then prd-clarifier skill

Process:

1. Generate a demo-grade PRD from the phase requirements
2. Run clarification session (recommend "Long" depth = 20 questions)
3. Document all decisions in the clarification session log

Output file: {change-id}/specs/{capability}/{capability}-prd-clarification-session.md

Example: For phase "1. Pocket Import" in change "add-launch-features":

• Output: add-launch-features/specs/article-import/article-import-prd-clarification-session.md

Step 2: UX Specification

Invoke: prd-to-ux skill

Process:

1. Read the clarification session from Step 1
2. Execute all 6 UX passes (NO shortcuts):
   • Pass 1: Mental Model
   • Pass 2: Information Architecture
   • Pass 3: Affordances
   • Pass 4: Cognitive Load
   • Pass 5: State Design
   • Pass 6: Flow Integrity
3. Generate visual specifications

Output file: {prd-clarification-file}-ux-spec.md (same directory as Step 1 output)

Step 3: Build-Order Prompts

Invoke: ux-spec-to-prompts skill

Process:

1. Read the UX spec from Step 2
2. Extract atomic buildable units
3. Map dependencies between units
4. Sequence by build order (foundation → components → assembly)
5. Generate self-contained prompts

Output file: {capability}-build-prompts.md (same directory)

Output Summary

After completion, report all generated files:

Pipeline Complete: {change-id} Phase {phase}

Generated Files:
1. PRD + Clarifications: {path}
2. UX Specification: {path}
3. Build Prompts: {path}

Next Steps:
- Use build prompts with v0, Bolt, or frontend-design skill
- Update tasks.md with any new requirements discovered
- Update spec.md with new scenarios from clarifications

File Naming Convention

All outputs go in the openspec change's specs directory for the relevant capability:

openspec/changes/{change-id}/specs/{capability}/
├── spec.md                                          # Original spec (don't modify)
├── {capability}-prd-clarification-session.md        # Step 1 output
├── {capability}-prd-clarification-session-ux-spec.md  # Step 2 output
└── {capability}-build-prompts.md                    # Step 3 output

Determining Capability Name

Map phase numbers to capability names by reading the change's spec structure:

| Phase | tasks.md Section | Likely Capability | |-------|-----------------|-------------------| | 1 | "1. Pocket Import" | article-import | | 2 | "2. Browser Extension" | browser-extension | | 3 | "3. Offline Reading" | offline-reading |

Check openspec/changes/{change-id}/specs/ for exact capability directory names.

Error Handling

| Issue | Resolution | |-------|------------| | Phase not found in tasks.md | List available phases, ask user to confirm | | No specs directory for capability | Create it, or output to change root | | User wants to skip clarification | Not allowed - clarification prevents implementation bugs | | User wants fewer than 20 questions | Recommend "Long" but accept "Medium" (10) minimum |

Important Constraints

1. No shortcuts - Each step must complete fully before the next begins
2. Clarification is mandatory - The questions prevent costly rework
3. UX passes are mandatory - All 6 passes, no skipping to visuals
4. Self-contained prompts - Each build prompt must stand alone
5. Track progress - Use TodoWrite to show pipeline progress

Example Invocation

User: "Run openspec-to-prompts for add-launch-features phase 2"

Response:

1. Read tasks.md section "2. Browser Extension"
2. Read proposal.md for context
3. Read specs/browser-extension/spec.md for requirements
4. Invoke prd-lite → generate PRD
5. Invoke prd-clarifier → clarification questions (Long depth)
6. Invoke prd-to-ux → 6-pass UX spec
7. Invoke ux-spec-to-prompts → build prompts
8. Report all generated files