diff --git a/.kiro/specs/ultimate-lists-app/tasks.md b/.kiro/specs/ultimate-lists-app/tasks.md
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+# Implementation Plan: Ultimate Lists App
+
+- [x] 1. Enhance database schema with missing fields
+  - Update Prisma schema to add tags (JSON array) and notes fields to Item model
+  - Run database migration to apply schema changes
+  - Regenerate Prisma client with updated types
+  - _Requirements: 5.3, 5.4_
+
+- [ ]* 1.1 Write property test for metadata round-trip
+  - **Property 4: Task metadata round-trip**
+  - **Validates: Requirements 1.4, 5.1, 5.2, 5.3, 5.4**
+
+- [x] 2. Implement core server actions for enhanced task operations
+  - Add updateItem server action with support for all metadata fields
+  - Add deleteItem server action with proper revalidation
+  - Add deleteList server action with cascade behavior
+  - Add updateList server action for renaming
+  - _Requirements: 1.2, 1.3, 2.4, 2.5_
+
+- [ ]* 2.1 Write property test for task updates preserve identity
+  - **Property 2: Task updates preserve identity**
+  - **Validates: Requirements 1.2**
+
+- [ ]* 2.2 Write property test for task deletion
+  - **Property 3: Task deletion removes from queries**
+  - **Validates: Requirements 1.3**
+
+- [ ]* 2.3 Write property test for cascade deletion
+  - **Property 9: Cascade deletion**
+  - **Validates: Requirements 2.4**
+
+- [ ]* 2.4 Write property test for list rename preserves items
+  - **Property 10: List rename preserves items**
+  - **Validates: Requirements 2.5**
+
+- [ ] 3. Implement search functionality
+  - Create searchItems server action that searches across title, description, notes, and tags
+  - Add support for list-scoped search vs global search
+  - Implement text highlighting utility function
+  - _Requirements: 8.1, 8.2, 8.5_
+
+- [ ]* 3.1 Write property test for search result completeness
+  - **Property 21: Search result completeness**
+  - **Validates: Requirements 8.1**
+
+- [ ]* 3.2 Write property test for search highlight correctness
+  - **Property 22: Search highlight correctness**
+  - **Validates: Requirements 8.2**
+
+- [ ]* 3.3 Write property test for search scope correctness
+  - **Property 24: Search scope correctness**
+  - **Validates: Requirements 8.5**
+
+- [ ] 4. Implement filtering and sorting
+  - Create getItemsByFilter server action with support for priority, completed, tags, and due date filters
+  - Implement compound filter logic (AND conditions)
+  - Add sorting by createdAt, dueDate, priority, and title
+  - Handle null due dates in sorting (place at end)
+  - _Requirements: 6.1, 6.2, 6.3, 6.5_
+
+- [ ]* 4.1 Write property test for sort order correctness
+  - **Property 15: Sort order correctness**
+  - **Validates: Requirements 6.1**
+
+- [ ]* 4.2 Write property test for filter matching correctness
+  - **Property 16: Filter matching correctness**
+  - **Validates: Requirements 6.2**
+
+- [ ]* 4.3 Write property test for compound filter conjunction
+  - **Property 17: Compound filter conjunction**
+  - **Validates: Requirements 6.3**
+
+- [ ]* 4.4 Write property test for null due date sorting
+  - **Property 19: Null due date sorting**
+  - **Validates: Requirements 6.5**
+
+- [ ] 5. Create item detail page and form components
+  - Build /list/[id]/item/[itemId] page for viewing full item details
+  - Create ItemForm component with fields for all metadata (priority, due date, tags, notes)
+  - Create ItemDetail component to display all item information
+  - Add form validation for item inputs
+  - _Requirements: 1.1, 1.2, 5.1, 5.2, 5.3, 5.4_
+
+- [ ]* 5.1 Write property test for task creation preserves description
+  - **Property 1: Task creation preserves description**
+  - **Validates: Requirements 1.1**
+
+- [ ] 6. Enhance list management UI
+  - Add ListForm component for creating and editing lists
+  - Implement list deletion with confirmation dialog
+  - Add list renaming functionality
+  - Update ListCard to show accurate item counts
+  - _Requirements: 2.1, 2.2, 2.4, 2.5_
+
+- [ ]* 6.1 Write property test for list creation with unique identifiers
+  - **Property 6: List creation with unique identifiers**
+  - **Validates: Requirements 2.1**
+
+- [ ]* 6.2 Write property test for list retrieval completeness
+  - **Property 7: List retrieval completeness**
+  - **Validates: Requirements 2.2**
+
+- [ ] 7. Build list detail page with item management
+  - Create /list/[id] page showing all items in a list
+  - Add ItemCard component with completion toggle, priority badge, and due date display
+  - Implement inline item creation
+  - Add item deletion functionality
+  - Show overdue indicators for past due dates
+  - _Requirements: 1.3, 1.5, 2.3, 5.5_
+
+- [ ]* 7.1 Write property test for task completion toggle
+  - **Property 5: Task completion toggle**
+  - **Validates: Requirements 1.5**
+
+- [ ]* 7.2 Write property test for list filtering correctness
+  - **Property 8: List filtering correctness**
+  - **Validates: Requirements 2.3**
+
+- [ ]* 7.3 Write property test for overdue task identification
+  - **Property 14: Overdue task identification**
+  - **Validates: Requirements 5.5**
+
+- [ ] 8. Add search and filter UI components
+  - Create SearchBar component with debounced input
+  - Build FilterPanel component with controls for priority, completion, tags, and due date
+  - Add sort controls (field and direction)
+  - Implement filter clear functionality
+  - Display search results with highlighted text
+  - _Requirements: 6.1, 6.2, 6.3, 6.4, 8.1, 8.2, 8.3_
+
+- [ ]* 8.1 Write property test for filter clear restoration
+  - **Property 18: Filter clear restoration**
+  - **Validates: Requirements 6.4**
+
+- [ ]* 8.2 Write property test for search clear restoration
+  - **Property 23: Search clear restoration**
+  - **Validates: Requirements 8.3**
+
+- [ ] 9. Implement client-side state management
+  - Create useSearch hook for search state and debouncing
+  - Create useFilters hook for filter state management
+  - Create useOptimisticUpdate hook for optimistic UI updates
+  - Add scroll position preservation logic
+  - _Requirements: 6.4, 7.4, 8.3_
+
+- [ ]* 9.1 Write property test for scroll position preservation
+  - **Property 20: Scroll position preservation**
+  - **Validates: Requirements 7.4**
+
+- [ ] 10. Checkpoint - Ensure all tests pass
+  - Ensure all tests pass, ask the user if questions arise.
+
+- [ ] 11. Set up PWA infrastructure
+  - Create service worker (public/sw.js) with caching strategies
+  - Implement cache-first strategy for static assets
+  - Implement stale-while-revalidate for API responses
+  - Add offline fallback page
+  - Update manifest.json with complete metadata
+  - Add service worker registration in app layout
+  - _Requirements: 4.1, 4.3, 4.4_
+
+- [ ]* 11.1 Write property test for offline resource availability
+  - **Property 12: Offline resource availability**
+  - **Validates: Requirements 4.4**
+
+- [ ] 12. Implement offline synchronization
+  - Create useOfflineSync hook for detecting connectivity
+  - Implement mutation queue for offline operations
+  - Add background sync for pending mutations
+  - Show offline indicator in UI
+  - Handle sync conflicts gracefully
+  - _Requirements: 4.5_
+
+- [ ]* 12.1 Write property test for offline mutation synchronization
+  - **Property 13: Offline mutation synchronization**
+  - **Validates: Requirements 4.5**
+
+- [ ] 13. Add PWA assets and metadata
+  - Generate app icons in multiple sizes (192x192, 512x512)
+  - Create favicon and apple-touch-icon
+  - Add meta tags for PWA in app layout
+  - Configure theme color and background color
+  - Test "Add to Home Screen" functionality in Safari
+  - _Requirements: 4.1, 4.2_
+
+- [ ] 14. Implement responsive design enhancements
+  - Ensure all components are mobile-responsive
+  - Add touch-optimized controls (larger tap targets)
+  - Test on various screen sizes
+  - Optimize layout for mobile and desktop
+  - _Requirements: 7.1, 7.2_
+
+- [ ] 15. Add visual feedback and polish
+  - Implement loading states for async operations
+  - Add success/error toast notifications
+  - Create smooth transitions between views
+  - Add empty states for lists and items
+  - Implement skeleton loaders
+  - _Requirements: 7.3_
+
+- [ ] 16. Implement error handling
+  - Add try-catch blocks to all server actions
+  - Implement error boundaries in React components
+  - Add user-friendly error messages
+  - Handle database connection failures gracefully
+  - Implement retry logic for failed operations
+  - _Requirements: All (error handling is cross-cutting)_
+
+- [ ] 17. Add input validation
+  - Validate all form inputs before submission
+  - Add inline validation errors
+  - Prevent empty task/list creation
+  - Validate date formats
+  - Sanitize user inputs
+  - _Requirements: 1.1, 2.1_
+
+- [ ] 18. Optimize performance
+  - Add database indexes for frequently queried fields
+  - Implement pagination for large lists
+  - Optimize bundle size with code splitting
+  - Add loading states to prevent layout shift
+  - Use React.memo for expensive components
+  - _Requirements: All (performance is cross-cutting)_
+
+- [ ] 19. Final checkpoint - Ensure all tests pass
+  - Ensure all tests pass, ask the user if questions arise.
+
+- [ ] 20. End-to-end testing and polish
+  - Test complete user flows from list creation to task completion
+  - Verify PWA installation on iOS Safari
+  - Test offline functionality in real scenarios
+  - Check accessibility with screen readers
+  - Verify all requirements are met
+  - _Requirements: All_
diff --git a/lib/actions.ts b/lib/actions.ts
index d8e6ab0..c56c24b 100644
--- a/lib/actions.ts
+++ b/lib/actions.ts
@@ -60,4 +60,62 @@ export async function toggleItem(itemId: string) {
   })
   revalidatePath(`/list/${item.listId}`)
   return updated
+}
+
+export async function updateItem(
+  itemId: string,
+  data: {
+    title?: string
+    description?: string | null
+    completed?: boolean
+    priority?: 'low' | 'medium' | 'high'
+    dueDate?: Date | null
+    tags?: string[]
+    notes?: string | null
+  }
+) {
+  const item = await prisma.item.findUnique({ where: { id: itemId } })
+  if (!item) return null
+
+  const updated = await prisma.item.update({
+    where: { id: itemId },
+    data,
+  })
+  revalidatePath(`/list/${item.listId}`)
+  return updated
+}
+
+export async function deleteItem(itemId: string) {
+  const item = await prisma.item.findUnique({ where: { id: itemId } })
+  if (!item) return null
+
+  await prisma.item.delete({
+    where: { id: itemId },
+  })
+  revalidatePath(`/list/${item.listId}`)
+  return { success: true }
+}
+
+export async function deleteList(listId: string) {
+  await prisma.list.delete({
+    where: { id: listId },
+  })
+  revalidatePath('/')
+  return { success: true }
+}
+
+export async function updateList(
+  listId: string,
+  data: {
+    title?: string
+    color?: string
+  }
+) {
+  const updated = await prisma.list.update({
+    where: { id: listId },
+    data,
+  })
+  revalidatePath('/')
+  revalidatePath(`/list/${listId}`)
+  return updated
 }
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