Global Rules: Adheres to rules/archflow-rules.md.

Model: Opus required. UI derivation needs domain knowledge and pattern matching.

UI Workflow

Generate UI specification from requirements + backend API endpoints.

Tool Fallback

Tool	Alternative
Read	Request user to copy-paste document content
AskQuestion	"Select: 1) A 2) B" format

Document Structure

docs/{serviceName}/
  ├── spec.md      # Input (requirements)
  ├── arch-be.md   # Input (backend API)
  └── ui.md        # ← This skill's output

---

Phase -1: Service Discovery

Scan docs/, select service, resolve spec.md and arch-be.md paths.

Phase 0: Skill Entry

0-1. Collect Document Input

If Service Discovery successful: verify spec.md and arch-be.md exist. Both exist → auto-load. Missing → guide to /spec or /arch.

If Service Discovery failed:

{
  "title": "UI Specification",
  "questions": [
    {
      "id": "has_spec",
      "prompt": "Do you have a requirements document? (docs/{serviceName}/spec.md)",
      "options": [
        {"id": "yes", "label": "Yes - I will provide via @filepath"},
        {"id": "no", "label": "No - Run /spec first"}
      ]
    },
    {
      "id": "has_arch_be",
      "prompt": "Do you have a backend design document? (docs/{serviceName}/arch-be.md)",
      "options": [
        {"id": "yes", "label": "Yes - I will provide via @filepath"},
        {"id": "no", "label": "No - Run /arch (Backend) first"}
      ]
    }
  ]
}

Either no → guide to required skill. Both yes → request paths → 0-1.5.

0-1.5. Responsive Option

{
  "title": "Target Platform",
  "questions": [
    {
      "id": "responsive",
      "prompt": "What platforms are you targeting?",
      "options": [
        {"id": "mobile", "label": "Mobile only - 375px viewport"},
        {"id": "desktop", "label": "Desktop only - 1280px+"},
        {"id": "responsive", "label": "Both (Responsive) - Mobile First"}
      ]
    }
  ]
}

Breakpoint hints for responsive:

breakpoints:
  mobile: "< 640px"
  tablet: "640-1024px"
  desktop: "> 1024px"

Record selection in ui.md header, apply to all wireframes.

0-2. Infer serviceName

Extract from path: docs/blog/spec.md → serviceName = "blog" → output: docs/blog/ui.md

0-3. Load Documents

Read spec.md (functional requirements) and arch-be.md (API endpoints, schemas).

---

Phase 1: Derive Screen List

1-1. Analyze Endpoints

Endpoint Pattern	Screen Derivation
GET /resources	List screen
GET /resources/:id	Detail screen
POST /resources	Create form
PUT /resources/:id	Edit form
DELETE /resources/:id	Delete confirmation (modal)
POST /auth/login	Login screen
POST /auth/register	Registration screen

1-2. Map Requirements to Screens

Cross-reference spec.md with derived screens. Flag screens without requirements or requirements without screens.

1-3. Generate Screen List

#	Screen	Route	Related Endpoints	Auth Required	Spec Reference
1	{name}	{route}	{endpoints}	Yes/No	FR-xxx

1-4. User Checkpoint

"I've derived {N} screens from the API endpoints. Please review:

{Screen List Table}

Should I proceed with detailed UI specifications?"

---

Phase 2: Screen Specifications

For each screen:

2-1. UI Components (ASCII Wireframe)

┌─────────────────────────────────────────────┐
│ [Logo]                    [Login/Profile]   │
├─────────────────────────────────────────────┤
│                                             │
│  Main content area                          │
│                                             │
└─────────────────────────────────────────────┘

2-2. Component Hierarchy

{ScreenName}Page:
  - Header:
      - Logo
      - Navigation
      - AuthButton
  - MainContent:
      - {Feature}Section:
          - {Component}
          - {Component}
  - Footer

2-3. States Definition

State	Trigger	UI Behavior
loading	Initial fetch	Show skeleton/spinner
empty	No data	Show empty state message
error	API error	Show error message + retry
loaded	Data received	Render content

2-4. User Interactions

#	Action	Trigger	API Call	Result
1	{action}	{event}	{endpoint}	{outcome}

---

Phase 3: Shared Components

3-1. Identify Reusable Components

Component	Used In	Props	Description
Header	All pages	-	Global navigation
AuthButton	Header	isLoggedIn, user	Login/profile toggle
Pagination	List pages	page, total, onChange	Page navigation
ConfirmModal	Delete actions	title, onConfirm	Confirmation dialog
LoadingSkeleton	All pages	variant	Loading placeholder
EmptyState	List pages	message, action	No data state
ErrorMessage	Forms	message	Validation/API error

3-2. Design System Reference

recommendation:
  ui_library: "{recommended library}"
  styling: "{styling approach}"
  icons: "{icon library}"
patterns:
  layout: "{layout pattern}"          # e.g., max-w-4xl mx-auto
  spacing: "{spacing system}"         # e.g., Tailwind default scale
  typography: "{typography approach}"  # e.g., prose class for content

---

Phase 4: Generate ui.md

Template

# UI Specification: {Feature Name}

> Created: {date}
> Service: {serviceName}
> Platform: {mobile|desktop|responsive}
> Requirements: docs/{serviceName}/spec.md
> Backend API: docs/{serviceName}/arch-be.md

## 0. Responsive Strategy
```yaml
platform: "{type}"
breakpoints:              # responsive only
  mobile: "< 640px"
  tablet: "640-1024px"
  desktop: "> 1024px"
approach: "Mobile First"

1. Screen List

#	Screen	Route	Related Endpoints	Auth Required	Spec Reference

2. Screen Specifications

2.1 {ScreenName} ({route})

Purpose: {description} UI Components:

{ASCII wireframe}

Component Hierarchy:

{component tree}

States:

State	Trigger	UI Behavior
loading	{behavior}	{detail}
empty	{behavior}	{detail}
error	{behavior}	{detail}
loaded	{behavior}	{detail}

User Interactions:

#	Action	Trigger	API Call	Result

(Repeat for each screen)

3. Shared Components

Component	Props	Usage

4. Design System Reference

recommendation:
  ui_library: "{lib}"
  styling: "{approach}"
  icons: "{lib}"

5. Next Steps

Run /arch Frontend to generate technical architecture. Input: docs/{serviceName}/spec.md + docs/{serviceName}/ui.md

Save: `docs/{serviceName}/ui.md`

## Phase 5: Completion Report

Report: service, screen count, component count, derived-from docs. Next: run `/arch` Frontend.

---

# Integration Flow

[spec] → spec.md ↓ [arch] (Backend) → arch-be.md ↓ [ui] → ui.md ↓ [arch] (Frontend) → arch-fe.md ↓ [build] (Frontend) → Implementation

## Important Notes

1. **Endpoint-driven**: every screen maps to at least one endpoint; screens without endpoints may indicate missing backend features
2. **Domain patterns**: use common UI patterns for the domain (e-commerce, blog, dashboard, etc.)
3. **State handling**: every screen must define all 4 states (loading/empty/error/loaded)
4. **ASCII wireframes**: focus on component structure and hierarchy, not visual design