LAYER_09_UX

UX Layer Skill

Layer Number: 09 Specification: Metadata Model Spec v0.7.0 Purpose: Defines user experience using Three-Tier Architecture, specifying views, components, state machines, and interactions.

Layer Overview

The UX Layer captures user experience design:

• VIEWS - Routable screens/pages with layouts
• COMPONENTS - UI components (forms, tables, charts, cards)
• STATE MACHINES - Experience states and transitions
• ACTIONS - Interactive elements (buttons, links, voice commands)
• VALIDATION - Client-side validation rules
• LAYOUTS - Layout configurations (grid, flex, etc.)

This layer uses Three-Tier Architecture (v0.5.0+):

1. Library Tier - Reusable design system components
2. Application Tier - Application-wide configuration
3. Experience Tier - Experience-specific views and flows

Central Entity: The View (routable screen) is the core modeling unit.

Entity Types

Three-Tier Architecture (26 entities)

Library Tier:

• UXLibrary - Container for library components
• LibraryComponent - Reusable component (form-field, table, chart, card)
• LibrarySubView - Reusable component groupings
• StatePattern - Reusable state machine patterns
• ActionPattern - Reusable action definitions

Application Tier:

• UXApplication - Application-wide UX configuration

Experience Tier:

• UXSpec - Container for experience specification
• View - Routable screen/page
• SubView - Component grouping within view
• ComponentInstance - Instance of library component
• ActionComponent - Interactive element
• ExperienceState - State in state machine
• StateAction - Action during state lifecycle
• StateTransition - Transition between states
• ValidationRule - Client-side validation

When to Use This Skill

Activate when the user:

• Mentions "UX", "UI", "view", "screen", "component", "form"
• Wants to define user interfaces or user experiences
• Asks about state machines, transitions, or user flows
• Needs to model screens, forms, or interactive elements
• Wants to link UX to navigation, APIs, or business processes

Cross-Layer Relationships

Outgoing (UX → Other Layers):

• motivation.* → Motivation Layer (UX supports goals)
• business.* → Business Layer (UX realizes business processes)
• api.* → API Layer (API calls from components)
• data.* → Data Model Layer (form validation rules)
• navigation.* → Navigation Layer (routing to views)

Incoming (Other Layers → UX):

• Navigation Layer → UX (routes point to views)
• Business Layer → UX (business processes trigger UX flows)

Design Best Practices

1. Reusability - Use library components for consistency
2. State machines - Model complex flows with states/transitions
3. Validation - Add client-side validation rules
4. Accessibility - Consider accessibility requirements
5. Responsive - Design for multiple screen sizes
6. Performance - Set performance targets (load time, interaction latency)
7. Error handling - Define error states and messages

Common Commands

# Add view
dr add ux view --name "User Profile" --property route=/profile

# Add component instance
dr add ux component-instance --name "Profile Form"

# List views
dr list ux view

# Validate UX layer
dr validate --layer ux

# Export UX documentation
dr export --layer ux --format markdown

Example: Login View

id: ux.view.login
name: "Login View"
type: view
properties:
  route: /login
  layout:
    type: centered
    maxWidth: 400px
  components:
    - id: login-form
      componentRef: library.component.form-field
      dataBinding:
        source: api.operation.login
        submitAction: POST /api/auth/login
      fields:
        - name: email
          type: email
          required: true
          validation:
            - type: email-format
            - type: required
        - name: password
          type: password
          required: true
          validation:
            - type: min-length
              value: 8
  actions:
    - id: submit-button
      type: button
      label: "Login"
      action: submit-form
      target: login-form
    - id: forgot-password
      type: link
      label: "Forgot password?"
      navigation: /forgot-password
  states:
    - id: idle
      initial: true
      onEnter: []
    - id: submitting
      onEnter:
        - action: disable-form
        - action: show-spinner
    - id: success
      onEnter:
        - action: navigate
          target: /dashboard
    - id: error
      onEnter:
        - action: show-error
        - action: enable-form
  transitions:
    - from: idle
      to: submitting
      trigger: submit
    - from: submitting
      to: success
      trigger: success
    - from: submitting
      to: error
      trigger: failure
    - from: error
      to: idle
      trigger: retry
  motivation:
    supports-goals:
      - motivation.goal.user-authentication
  api:
    operationId: login
  navigation:
    route-ref: navigation.route.login

Pitfalls to Avoid

• ❌ Not using library components (inconsistent UX)
• ❌ Missing validation rules (poor user experience)
• ❌ Complex state machines without documentation
• ❌ Not linking to API operations or navigation routes
• ❌ Missing error states and handling
• ❌ No performance targets defined