docs(samples-cc-react-app): add AI documentation - AGENTS.md (#594)

Co-authored-by: Rankush Kumar <rankkuma+cisco@cisco.com>

Author: Shreyas281299

widgets-samples/cc/samples-cc-react-app/ai-docs/AGENTS.md

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+# React Sample App - Widget Integration Guide
+
+## Purpose
+
+Demonstrates how to integrate Contact Center widgets into a React application. Use this as a reference when adding new widgets.
+
+## Design System
+
+- **Framework:** React 18.3.1 + TypeScript
+- **UI Library:** Momentum Design System (`@momentum-design/components`)
+- **State:** MobX store (`@webex/cc-store`)
+- **Theme:** Dark/Light mode toggle (persisted in localStorage)
+- **Layout:** CSS Grid with `.box`, `.section-box`, `.fieldset` structure
+
+## Critical Integration Pattern
+
+**Follow this exact pattern for ALL new widgets:**
+
+### Step 1: Import the Widget
+
+```tsx
+import {NewWidget} from '@webex/cc-widgets';
+```
+
+### Step 2: Add to defaultWidgets
+
+```tsx
+const defaultWidgets = {
+  stationLogin: true,
+  userState: true,
+  // ... existing widgets
+  newWidget: false, // ← Add here (false by default for user opt-in)
+};
+```
+
+### Step 3: Add Checkbox for Widget Selection
+
+```tsx
+<Checkbox
+  onChange={handleCheckboxChange}
+  name="newWidget"
+  checked={selectedWidgets.newWidget}
+  htmlId="newWidget-checkbox"
+  aria-label="new widget checkbox"
+>
+  <Text>New Widget</Text>
+</Checkbox>
+```
+
+### Step 4: Conditional Rendering with Standard Layout
+
+```tsx
+{
+  selectedWidgets.newWidget && (
+    <div className="box">
+      <section className="section-box">
+        <fieldset className="fieldset">
+          <legend className="legend-box">New Widget</legend>
+          <NewWidget onEvent={(data) => handleNewWidgetEvent(data)} onError={(error) => onError('NewWidget', error)} />
+        </fieldset>
+      </section>
+    </div>
+  );
+}
+```
+
+### Step 5: Add callbacks (if needed)
+
+```tsx
+const handleNewWidgetCallback = (data) => {
+  console.log('New widget callback:', data);
+  // Handle callback logic
+};
+```
+
+## Layout Structure Rules
+
+### Container Hierarchy (ALWAYS use this)
+
+```tsx
+<div className="box">
+  {' '}
+  {/* Outer container with background */}
+  <section className="section-box">
+    {' '}
+    {/* Inner section with padding */}
+    <fieldset className="fieldset">
+      {' '}
+      {/* Fieldset for grouping */}
+      <legend className="legend-box">Title</legend> {/* Title/legend */}
+      <WidgetComponent /> {/* Actual widget */}
+    </fieldset>
+  </section>
+</div>
+```
+
+### Why this structure?
+
+- `box` - Consistent spacing and background
+- `section-box` - Momentum Design padding
+- `fieldset` - Semantic grouping
+- `legend-box` - Styled title
+- **Result:** Visual consistency across all widgets
+
+## Styling Rules
+
+### CSS Variables (MUST USE)
+
+```scss
+// Colors
+var(--mds-color-theme-text-primary-normal)
+var(--mds-color-theme-background-solid-primary-normal)
+var(--mds-color-theme-background-primary-normal)
+
+// Spacing
+var(--mds-spacing-1)  // 0.25rem (4px)
+var(--mds-spacing-2)  // 0.5rem (8px)
+var(--mds-spacing-3)  // 1rem (16px)
+var(--mds-spacing-4)  // 1.5rem (24px)
+
+// Typography
+var(--mds-font-size-body-small)
+var(--mds-font-size-body-medium)
+```
+
+### ❌ NEVER Do This
+
+```tsx
+<div style={{color: '#FF0000'}}>  // Hardcoded color
+<div style={{padding: '10px'}}>   // Hardcoded spacing
+```
+
+### ✅ ALWAYS Do This
+
+```tsx
+<div style={{
+  color: 'var(--mds-color-theme-text-primary-normal)',
+  padding: 'var(--mds-spacing-3)'
+}}>
+```
+
+## Event Handling Pattern
+
+### Standard onError Handler
+
+```tsx
+const onError = (widgetName: string, error: Error) => {
+  console.error(`${widgetName} error:`, error);
+  // Optional: Show toast notification
+  setToast({type: 'error'});
+};
+```
+
+**EVERY widget MUST have onError callback.**
+
+### Widget-Specific Events
+
+```tsx
+// IncomingTask
+const onIncomingTaskCB = ({task}) => {
+  console.log('Incoming task:', task);
+  setIncomingTasks((prev) => [...prev, task]);
+  playNotificationSound(); // Custom logic
+};
+
+// UserState
+const onAgentStateChangedCB = (newState: AgentState, oldState: AgentState) => {
+  console.log('State changed from', oldState, 'to', newState);
+  setSelectedState(newState);
+};
+
+// CallControl
+const onRecordingToggleCB = ({isRecording, task}) => {
+  console.log('Recording:', isRecording, 'for task:', task.data.interactionId);
+};
+```
+
+## Theme Integration
+
+Theme is controlled by `@momentum-ui`'s `ThemeProvider`:
+
+```tsx
+import {ThemeProvider} from '@momentum-design/components/dist/react';
+
+<ThemeProvider
+  themeclass={store.currentTheme === 'LIGHT' ? 'mds-theme-stable-lightWebex' : 'mds-theme-stable-darkWebex'}
+>
+  {/* Your widgets */}
+</ThemeProvider>;
+```
+
+- **Theme provider**: `@momentum-ui` library manages the theme through `ThemeProvider`
+- **Theme storage**: `store.currentTheme` stores the theme as a string ('LIGHT' or 'DARK')
+- **Theme classes**: Theme class names (`mds-theme-stable-lightWebex` / `mds-theme-stable-darkWebex`) are passed to ThemeProvider
+- **Automatic updates**: All widgets automatically respond to theme changes through the ThemeProvider context
+
+**User can toggle theme via UI checkbox** - widgets update automatically through the provider.
+
+## State Management
+
+### When to Use store Directly
+
+```tsx
+// Access store for global state
+import {store} from '@webex/cc-widgets';
+
+// Examples:
+store.currentTask; // Current active task
+store.taskList; // All tasks
+store.incomingTask; // Incoming task
+store.agentState; // Current agent state
+```
+
+### When to Use Local State
+
+```tsx
+// UI-only state (no widget dependency)
+const [showPopup, setShowPopup] = useState(false);
+const [selectedOption, setSelectedOption] = useState('');
+```
+
+## Complete Example: Adding a New Widget
+
+```tsx
+// 1. Import
+import {NewAwesomeWidget} from '@webex/cc-widgets';
+
+// 2. Add to defaultWidgets
+const defaultWidgets = {
+  // ... existing
+  newAwesomeWidget: false,
+};
+
+// 3. Checkbox in widget selector
+<Checkbox
+  onChange={handleCheckboxChange}
+  name="newAwesomeWidget"
+  checked={selectedWidgets.newAwesomeWidget}
+  htmlId="newAwesomeWidget-checkbox"
+>
+  <Text>New Awesome Widget</Text>
+</Checkbox>;
+
+// 4. Setup callback handler (if needed)
+const handleCallback = (data) => {
+  console.log('Callback:', data);
+};
+
+// 5. Render with standard layout
+{
+  selectedWidgets.newAwesomeWidget && (
+    <div className="box">
+      <section className="section-box">
+        <fieldset className="fieldset">
+          <legend className="legend-box">New Awesome Widget</legend>
+          <NewAwesomeWidget
+            handleCallback={handleCallback}
+            onError={(error) => onError('NewAwesomeWidget', error)}
+            customProp={someValue}
+          />
+        </fieldset>
+      </section>
+    </div>
+  );
+}
+```
+
+## Common Mistakes to AVOID
+
+### ❌ Breaking CSS class structure
+
+```tsx
+// WRONG
+<div>
+  <NewWidget />
+</div>
+```
+
+### ✅ Correct
+
+```tsx
+<div className="box">
+  <section className="section-box">
+    <fieldset className="fieldset">
+      <legend className="legend-box">Widget Name</legend>
+      <NewWidget />
+    </fieldset>
+  </section>
+</div>
+```
+
+### ❌ Forgetting defaultWidgets entry
+
+```tsx
+// WRONG - Widget renders immediately, user can't disable
+{
+  selectedWidgets.newWidget && <NewWidget />;
+}
+// But newWidget not in defaultWidgets!
+```
+
+### ✅ Correct
+
+```tsx
+// In defaultWidgets
+const defaultWidgets = {
+  newWidget: false, // ← MUST ADD HERE
+};
+
+// Then render
+{
+  selectedWidgets.newWidget && <NewWidget />;
+}
+```
+
+### ❌ Missing error handler
+
+```tsx
+// WRONG
+<NewWidget onEvent={handleEvent} />
+```
+
+### ✅ Correct
+
+```tsx
+<NewWidget onEvent={handleEvent} onError={(error) => onError('NewWidget', error)} />
+```
+
+### ❌ Hardcoding colors
+
+```tsx
+// WRONG
+<div style={{backgroundColor: '#1a1a1a'}}>
+```
+
+### ✅ Correct
+
+```tsx
+<div style={{backgroundColor: 'var(--mds-color-theme-background-primary-normal)'}}>
+```
+
+## Testing Checklist
+
+After adding a new widget:
+
+- [ ] Widget imports without errors
+- [ ] Appears in widget selector checkbox list
+- [ ] Can be enabled/disabled via checkbox
+- [ ] Selection persists in localStorage
+- [ ] Renders with correct layout (box > section-box > fieldset)
+- [ ] Has legend/title
+- [ ] Uses Momentum CSS variables (no hardcoded colors)
+- [ ] Callbacks are handled correctly
+- [ ] onError handler present and logs errors
+- [ ] Works in both light and dark themes
+- [ ] No console errors when enabled/disabled
+- [ ] No visual/layout breaking when rendered alongside other widgets
+
+## File Locations
+
+- **Main App:** `src/App.tsx`
+- **Styles:** `src/App.scss`
+
+## Additional Resources
+
+- [MobX Store Package](../../packages/contact-center/store/ai-docs/agent.md)
+- [cc-widgets Package](../../packages/contact-center/cc-widgets/ai-docs/agent.md)