diff --git a/docs/development/build_execution_tracker.md b/docs/development/build_execution_tracker.md
index 710f9fe..41afac0 100644
--- a/docs/development/build_execution_tracker.md
+++ b/docs/development/build_execution_tracker.md
@@ -2,9 +2,9 @@
 
 ## Current status
 
-- main baseline updated through: feat/inventory-page-ui (Stage 5B complete)
-- next branch: feat/orders-domain (Stage 5C) or feat/bulk-operator-workflows (Stage 7B)
-- current stage: Stage 5B complete — inventory page UI with search, filter chips, detail panel, quantity adjust dialog, and snack bar feedback
+- main baseline updated through: feat/orders-domain (Stage 5C complete)
+- next branch: feat/bulk-operator-workflows (Stage 7B) or feat/orders-page-ui (Stage 5D)
+- current stage: Stage 5C complete — orders domain expansion with write operations (updateOrderStatus, addOrderNote, createOrder), OrderActionResult, copyWith, and 90 tests
 
 ## Slice tracker
 
@@ -285,6 +285,31 @@
 - analyze: passed (dart analyze --fatal-infos — no issues found)
 - brief updated: yes
 
+### feat/orders-domain
+
+- status: merged to main
+- date: 2026-07-10
+- inspection: complete
+- implementation: complete
+- files changed:
+  - `feature_orders/lib/src/domain/order.dart` — added `customerPhone`, `notes`, `orderNotes` fields; added `copyWith()`
+  - `feature_orders/lib/src/domain/order_action_result.dart` — new value object with `success`, `updatedOrder`, `errorMessage`; named constructors `success()` and `failure()`
+  - `feature_orders/lib/src/domain/orders_repository.dart` — expanded contract with `updateOrderStatus()`, `addOrderNote()`, `createOrder()`
+  - `feature_orders/lib/src/data/fake_orders_repository.dart` — added `customerPhone` to seed data; implemented all write methods with duplicate-check, empty-note guard, and status auto-update
+  - `feature_orders/lib/src/application/update_order_status.dart` — new use case wrapping `updateOrderStatus()`
+  - `feature_orders/lib/src/application/add_order_note.dart` — new use case wrapping `addOrderNote()`
+  - `feature_orders/lib/src/application/create_order.dart` — new use case wrapping `createOrder()`
+  - `feature_orders/lib/src/application/orders_controller.dart` — added `isUpdating`, `lastActionResult`, `updateOrderStatus()`, `addOrderNote()`, `createOrder()`, `consumeActionResult()`, `_reloadAndRefresh()` with filter/search persistence after writes; write use cases are optional named params for backward compatibility
+  - `feature_orders/lib/feature_orders.dart` — expanded barrel exports for all new types and use cases
+  - `feature_orders/test/feature_orders_test.dart` — expanded domain tests: Order (copyWith, defaults, computed props), OrderItem, OrderStatus, OrderActionResult, barrel smoke test
+  - `feature_orders/test/fake_orders_repository_test.dart` — expanded with write method tests: updateOrderStatus (4), addOrderNote (6), createOrder (4)
+  - `feature_orders/test/orders_controller_test.dart` — expanded with write-side tests: updateOrderStatus (6), addOrderNote (6), createOrder (4), consumeActionResult (3), filter/search persistence (2); read-side tests preserved
+  - `kell_web/test/dashboard/application/dashboard_controller_test.dart` — updated `_StubOrdersRepository` to implement expanded `OrdersRepository` contract
+  - `kell_creations_apps/tools/run_all_tests.sh` — added `feature_orders` and `kell_mobile` to `TESTABLE` list
+- tests: passed (90/90 feature_orders, 24/24 kell_web — all passing)
+- analyze: passed (dart analyze --fatal-infos — no issues found in feature_orders and kell_web)
+- brief updated: yes
+
 ### chore/analyze-cleanup-and-tracker-sync
 
 - status: merged to main
diff --git a/docs/development/master_development_brief.md b/docs/development/master_development_brief.md
index 406d621..4c3dad5 100644
--- a/docs/development/master_development_brief.md
+++ b/docs/development/master_development_brief.md
@@ -152,8 +152,8 @@ No minimum thresholds are enforced — this is visibility-only tracking. Coverag
 
 ### Next recommended branch
 
-**`feat/orders-domain`** — Stage 5C: Orders domain expansion (read + write operations, matching the pattern established by `feat/inventory-domain-expansion`), or **`feat/bulk-operator-workflows`** — Stage 7B: Additional bulk actions (bulk publish, bulk move to pending review).
-Branch from latest `main`. Stage 5B (inventory page UI) is complete. Stage 5C adds write operations and domain expansion to the orders feature. Stage 7B adds incremental bulk actions to the publishing workflow.
+**`feat/orders-page-ui`** — Stage 5D: Orders page UI hardening (status update action from detail panel, add note UI, snack bar feedback — matching the pattern established by `feat/inventory-page-ui`), or **`feat/bulk-operator-workflows`** — Stage 7B: Additional bulk actions (bulk publish, bulk move to pending review).
+Branch from latest `main`. Stage 5C (orders domain expansion) is complete. Stage 5D adds write-action UI to the orders page. Stage 7B adds incremental bulk actions to the publishing workflow.
 
 ---
 
@@ -1251,7 +1251,7 @@ Working rules:
 | ------------------- | ------------ | ----------------- | ------------ | -------------- | -------------------------------------------------- | ------- | -------------------- |
 | `feature_wordpress` | ✅ Complete  | ✅ Complete       | ✅ Complete  | ✅ WooCommerce | ✅ Complete                                        | 294     | **Production-ready** |
 | `feature_inventory` | ⚠️ Read-only | ⚠️ Read-only      | ⚠️ Read-only | ❌ None        | ⚠️ Read-only                                       | Minimal | **Fake-only MVP**    |
-| `feature_orders`    | ⚠️ Read-only | ⚠️ Read-only      | ⚠️ Read-only | ❌ None        | ⚠️ Read-only                                       | Some    | **Fake-only MVP**    |
+| `feature_orders`    | ✅ Write ops | ✅ Write ops      | ✅ Write ops | ❌ None        | ⚠️ Read-only UI                                    | 90      | **Fake write-ready** |
 | `feature_policy`    | ✅ Complete  | ✅ Complete       | ✅ Complete  | ❌ None        | ✅ Complete                                        | Minimal | **Fake-only MVP**    |
 | `feature_finance`   | ❌ Stub      | ❌ Stub           | ❌ Stub      | ❌ None        | ❌ Stub                                            | None    | **Scaffolded only**  |
 | `feature_mrp`       | ❌ Stub      | ❌ Stub           | ❌ Stub      | ❌ None        | ❌ Stub                                            | None    | **Scaffolded only**  |
diff --git a/kell_creations_apps/apps/kell_web/test/dashboard/application/dashboard_controller_test.dart b/kell_creations_apps/apps/kell_web/test/dashboard/application/dashboard_controller_test.dart
index 705f6e3..51df208 100644
--- a/kell_creations_apps/apps/kell_web/test/dashboard/application/dashboard_controller_test.dart
+++ b/kell_creations_apps/apps/kell_web/test/dashboard/application/dashboard_controller_test.dart
@@ -69,6 +69,16 @@ class _StubOrdersRepository implements OrdersRepository {
 
   @override
   Future<List<Order>> getOrders() async => orders;
+
+  @override
+  Future<OrderActionResult> updateOrderStatus(String id, OrderStatus newStatus) =>
+      throw UnimplementedError();
+
+  @override
+  Future<OrderActionResult> addOrderNote(String id, String note) => throw UnimplementedError();
+
+  @override
+  Future<OrderActionResult> createOrder(Order order) => throw UnimplementedError();
 }
 
 class _FailingInventoryRepository implements InventoryRepository {
diff --git a/kell_creations_apps/packages/feature_orders/build/unit_test_assets/NOTICES.Z b/kell_creations_apps/packages/feature_orders/build/unit_test_assets/NOTICES.Z
index 817dfc1..2fe8afc 100644
Binary files a/kell_creations_apps/packages/feature_orders/build/unit_test_assets/NOTICES.Z and b/kell_creations_apps/packages/feature_orders/build/unit_test_assets/NOTICES.Z differ
diff --git a/kell_creations_apps/packages/feature_orders/build/unit_test_assets/shaders/ink_sparkle.frag b/kell_creations_apps/packages/feature_orders/build/unit_test_assets/shaders/ink_sparkle.frag
index 794ba24..ebd8066 100644
Binary files a/kell_creations_apps/packages/feature_orders/build/unit_test_assets/shaders/ink_sparkle.frag and b/kell_creations_apps/packages/feature_orders/build/unit_test_assets/shaders/ink_sparkle.frag differ
diff --git a/kell_creations_apps/packages/feature_orders/build/unit_test_assets/shaders/stretch_effect.frag b/kell_creations_apps/packages/feature_orders/build/unit_test_assets/shaders/stretch_effect.frag
index c014a19..3c938de 100644
Binary files a/kell_creations_apps/packages/feature_orders/build/unit_test_assets/shaders/stretch_effect.frag and b/kell_creations_apps/packages/feature_orders/build/unit_test_assets/shaders/stretch_effect.frag differ
diff --git a/kell_creations_apps/packages/feature_orders/lib/feature_orders.dart b/kell_creations_apps/packages/feature_orders/lib/feature_orders.dart
index df547cb..0a301e7 100644
--- a/kell_creations_apps/packages/feature_orders/lib/feature_orders.dart
+++ b/kell_creations_apps/packages/feature_orders/lib/feature_orders.dart
@@ -1,7 +1,12 @@
 library;
 
+export 'src/application/add_order_note.dart';
+export 'src/application/create_order.dart';
+export 'src/application/get_orders.dart';
+export 'src/application/update_order_status.dart';
 export 'src/data/fake_orders_repository.dart';
 export 'src/domain/order.dart';
+export 'src/domain/order_action_result.dart';
 export 'src/domain/order_item.dart';
 export 'src/domain/order_status.dart';
 export 'src/domain/orders_repository.dart';
diff --git a/kell_creations_apps/packages/feature_orders/lib/src/application/add_order_note.dart b/kell_creations_apps/packages/feature_orders/lib/src/application/add_order_note.dart
new file mode 100644
index 0000000..f8f566c
--- /dev/null
+++ b/kell_creations_apps/packages/feature_orders/lib/src/application/add_order_note.dart
@@ -0,0 +1,11 @@
+import '../domain/order_action_result.dart';
+import '../domain/orders_repository.dart';
+
+/// Use case: append a note to an existing order.
+class AddOrderNote {
+  final OrdersRepository repository;
+
+  AddOrderNote(this.repository);
+
+  Future<OrderActionResult> call(String id, String note) => repository.addOrderNote(id, note);
+}
diff --git a/kell_creations_apps/packages/feature_orders/lib/src/application/create_order.dart b/kell_creations_apps/packages/feature_orders/lib/src/application/create_order.dart
new file mode 100644
index 0000000..6397716
--- /dev/null
+++ b/kell_creations_apps/packages/feature_orders/lib/src/application/create_order.dart
@@ -0,0 +1,12 @@
+import '../domain/order.dart';
+import '../domain/order_action_result.dart';
+import '../domain/orders_repository.dart';
+
+/// Use case: create a new order and persist it.
+class CreateOrder {
+  final OrdersRepository repository;
+
+  CreateOrder(this.repository);
+
+  Future<OrderActionResult> call(Order order) => repository.createOrder(order);
+}
diff --git a/kell_creations_apps/packages/feature_orders/lib/src/application/orders_controller.dart b/kell_creations_apps/packages/feature_orders/lib/src/application/orders_controller.dart
index c151fd3..c34e0cf 100644
--- a/kell_creations_apps/packages/feature_orders/lib/src/application/orders_controller.dart
+++ b/kell_creations_apps/packages/feature_orders/lib/src/application/orders_controller.dart
@@ -1,19 +1,42 @@
 import 'package:flutter/foundation.dart';
 
 import '../domain/order.dart';
+import '../domain/order_action_result.dart';
 import '../domain/order_status.dart';
+import 'add_order_note.dart';
+import 'create_order.dart';
 import 'get_orders.dart';
+import 'update_order_status.dart';
 
 /// Controller that manages the orders workspace state, including
-/// filtering by order status, free-text search, and order selection.
+/// filtering by order status, free-text search, order selection,
+/// and write operations (status update, note addition, order creation).
 class OrdersController extends ChangeNotifier {
   final GetOrders _getOrders;
+  final UpdateOrderStatus? _updateOrderStatus;
+  final AddOrderNote? _addOrderNote;
+  final CreateOrder? _createOrder;
 
-  OrdersController(this._getOrders);
+  OrdersController(
+    this._getOrders, {
+    UpdateOrderStatus? updateOrderStatus,
+    AddOrderNote? addOrderNote,
+    CreateOrder? createOrder,
+  }) : _updateOrderStatus = updateOrderStatus,
+       _addOrderNote = addOrderNote,
+       _createOrder = createOrder;
 
   bool isLoading = false;
+
+  /// Whether a write operation is in progress for the selected order.
+  bool isUpdating = false;
+
   Object? error;
 
+  /// The result of the last write action, or `null` if none has been performed
+  /// or the result has been consumed.
+  OrderActionResult? lastActionResult;
+
   /// All orders returned by the repository (unfiltered).
   List<Order> _allOrders = [];
 
@@ -32,6 +55,8 @@ class OrdersController extends ChangeNotifier {
   /// The current free-text search query applied to customer name / order ID.
   String searchQuery = '';
 
+  // ── Read operations ────────────────────────────────────────────────────
+
   /// Loads all orders and applies any current filter / search.
   Future<void> load() async {
     isLoading = true;
@@ -82,8 +107,100 @@ class OrdersController extends ChangeNotifier {
     return false;
   }
 
+  // ── Write operations ───────────────────────────────────────────────────
+
+  /// Updates the status of the order identified by [id].
+  ///
+  /// Sets [isUpdating] during the operation and stores the result in
+  /// [lastActionResult]. Reloads the order list on success and refreshes
+  /// [selectedOrder] if it was the updated order.
+  Future<void> updateOrderStatus(String id, OrderStatus newStatus) async {
+    if (_updateOrderStatus == null) return;
+    isUpdating = true;
+    lastActionResult = null;
+    notifyListeners();
+
+    try {
+      final result = await _updateOrderStatus(id, newStatus);
+      lastActionResult = result;
+      if (result.success) {
+        await _reloadAndRefresh(id);
+      }
+    } finally {
+      isUpdating = false;
+      notifyListeners();
+    }
+  }
+
+  /// Appends a note to the order identified by [id].
+  ///
+  /// Sets [isUpdating] during the operation and stores the result in
+  /// [lastActionResult]. Refreshes [selectedOrder] on success.
+  Future<void> addOrderNote(String id, String note) async {
+    if (_addOrderNote == null) return;
+    isUpdating = true;
+    lastActionResult = null;
+    notifyListeners();
+
+    try {
+      final result = await _addOrderNote(id, note);
+      lastActionResult = result;
+      if (result.success) {
+        await _reloadAndRefresh(id);
+      }
+    } finally {
+      isUpdating = false;
+      notifyListeners();
+    }
+  }
+
+  /// Creates a new order and adds it to the list.
+  ///
+  /// Sets [isUpdating] during the operation and stores the result in
+  /// [lastActionResult]. Reloads the order list on success.
+  Future<void> createOrder(Order order) async {
+    if (_createOrder == null) return;
+    isUpdating = true;
+    lastActionResult = null;
+    notifyListeners();
+
+    try {
+      final result = await _createOrder(order);
+      lastActionResult = result;
+      if (result.success) {
+        await _reloadAndRefresh(null);
+      }
+    } finally {
+      isUpdating = false;
+      notifyListeners();
+    }
+  }
+
+  /// Consumes and returns [lastActionResult], clearing it to `null`.
+  OrderActionResult? consumeActionResult() {
+    final result = lastActionResult;
+    lastActionResult = null;
+    return result;
+  }
+
   // ── Private helpers ────────────────────────────────────────────────────
 
+  /// Reloads all orders from the repository, re-applies filters, and
+  /// refreshes [selectedOrder] by [selectedId] if provided.
+  Future<void> _reloadAndRefresh(String? selectedId) async {
+    _allOrders = await _getOrders();
+    _applyFilters();
+
+    // Refresh the selected order from the updated list.
+    final refreshId = selectedId ?? selectedOrder?.id;
+    if (refreshId != null) {
+      final refreshed = _allOrders.where((o) => o.id == refreshId).firstOrNull;
+      if (refreshed != null) {
+        selectedOrder = refreshed;
+      }
+    }
+  }
+
   void _applyFilters() {
     var result = _allOrders;
 
diff --git a/kell_creations_apps/packages/feature_orders/lib/src/application/update_order_status.dart b/kell_creations_apps/packages/feature_orders/lib/src/application/update_order_status.dart
new file mode 100644
index 0000000..2159e35
--- /dev/null
+++ b/kell_creations_apps/packages/feature_orders/lib/src/application/update_order_status.dart
@@ -0,0 +1,13 @@
+import '../domain/order_action_result.dart';
+import '../domain/order_status.dart';
+import '../domain/orders_repository.dart';
+
+/// Use case: update the status of an order.
+class UpdateOrderStatus {
+  final OrdersRepository repository;
+
+  UpdateOrderStatus(this.repository);
+
+  Future<OrderActionResult> call(String id, OrderStatus newStatus) =>
+      repository.updateOrderStatus(id, newStatus);
+}
diff --git a/kell_creations_apps/packages/feature_orders/lib/src/data/fake_orders_repository.dart b/kell_creations_apps/packages/feature_orders/lib/src/data/fake_orders_repository.dart
index 57f6575..6af90c9 100644
--- a/kell_creations_apps/packages/feature_orders/lib/src/data/fake_orders_repository.dart
+++ b/kell_creations_apps/packages/feature_orders/lib/src/data/fake_orders_repository.dart
@@ -1,4 +1,5 @@
 import '../domain/order.dart';
+import '../domain/order_action_result.dart';
 import '../domain/order_item.dart';
 import '../domain/order_status.dart';
 import '../domain/orders_repository.dart';
@@ -11,6 +12,7 @@ class FakeOrdersRepository implements OrdersRepository {
       id: 'KC-1001',
       customerName: 'Sarah Mitchell',
       customerEmail: 'sarah.mitchell@example.com',
+      customerPhone: '828-555-0101',
       orderDate: DateTime(2026, 4, 1),
       status: OrderStatus.delivered,
       shippingAddress: '123 Maple St, Asheville, NC 28801',
@@ -55,6 +57,7 @@ class FakeOrdersRepository implements OrdersRepository {
       id: 'KC-1003',
       customerName: 'Emily Chen',
       customerEmail: 'emily.chen@example.com',
+      customerPhone: '704-555-0303',
       orderDate: DateTime(2026, 4, 3),
       status: OrderStatus.processing,
       shippingAddress: '789 Pine Rd, Charlotte, NC 28202',
@@ -109,6 +112,7 @@ class FakeOrdersRepository implements OrdersRepository {
       id: 'KC-1006',
       customerName: 'Maria Gonzalez',
       customerEmail: 'maria.gonzalez@example.com',
+      customerPhone: '404-555-0606',
       orderDate: DateTime(2026, 4, 4),
       status: OrderStatus.pending,
       shippingAddress: '987 Cedar Dr, Atlanta, GA 30301',
@@ -141,4 +145,42 @@ class FakeOrdersRepository implements OrdersRepository {
     await Future<void>.delayed(const Duration(milliseconds: 300));
     return List.unmodifiable(_orders);
   }
+
+  @override
+  Future<OrderActionResult> updateOrderStatus(String id, OrderStatus newStatus) async {
+    await Future<void>.delayed(const Duration(milliseconds: 200));
+    final index = _orders.indexWhere((o) => o.id == id);
+    if (index == -1) {
+      return const OrderActionResult.failure('Order not found.');
+    }
+    final updated = _orders[index].copyWith(status: newStatus);
+    _orders[index] = updated;
+    return OrderActionResult.success(updated);
+  }
+
+  @override
+  Future<OrderActionResult> addOrderNote(String id, String note) async {
+    await Future<void>.delayed(const Duration(milliseconds: 200));
+    if (note.trim().isEmpty) {
+      return const OrderActionResult.failure('Note cannot be empty.');
+    }
+    final index = _orders.indexWhere((o) => o.id == id);
+    if (index == -1) {
+      return const OrderActionResult.failure('Order not found.');
+    }
+    final existing = _orders[index];
+    final updated = existing.copyWith(orderNotes: [...existing.orderNotes, note.trim()]);
+    _orders[index] = updated;
+    return OrderActionResult.success(updated);
+  }
+
+  @override
+  Future<OrderActionResult> createOrder(Order order) async {
+    await Future<void>.delayed(const Duration(milliseconds: 200));
+    if (_orders.any((o) => o.id == order.id)) {
+      return OrderActionResult.failure('Order with ID ${order.id} already exists.');
+    }
+    _orders.add(order);
+    return OrderActionResult.success(order);
+  }
 }
diff --git a/kell_creations_apps/packages/feature_orders/lib/src/domain/order.dart b/kell_creations_apps/packages/feature_orders/lib/src/domain/order.dart
index b9d66bf..c7c903f 100644
--- a/kell_creations_apps/packages/feature_orders/lib/src/domain/order.dart
+++ b/kell_creations_apps/packages/feature_orders/lib/src/domain/order.dart
@@ -6,19 +6,32 @@ class Order {
   final String id;
   final String customerName;
   final String customerEmail;
+
+  /// Optional customer phone number.
+  final String? customerPhone;
+
   final DateTime orderDate;
   final OrderStatus status;
   final List<OrderItem> items;
   final String shippingAddress;
 
+  /// Optional internal operator notes about this order.
+  final String? notes;
+
+  /// Customer-visible order notes (e.g. gift message, special instructions).
+  final List<String> orderNotes;
+
   const Order({
     required this.id,
     required this.customerName,
     required this.customerEmail,
+    this.customerPhone,
     required this.orderDate,
     required this.status,
     required this.items,
     required this.shippingAddress,
+    this.notes,
+    this.orderNotes = const [],
   });
 
   /// The total value of the order.
@@ -26,4 +39,31 @@ class Order {
 
   /// The number of individual items in the order.
   int get itemCount => items.fold(0, (sum, item) => sum + item.quantity);
+
+  /// Returns a copy of this order with the given fields replaced.
+  Order copyWith({
+    String? id,
+    String? customerName,
+    String? customerEmail,
+    String? customerPhone,
+    DateTime? orderDate,
+    OrderStatus? status,
+    List<OrderItem>? items,
+    String? shippingAddress,
+    String? notes,
+    List<String>? orderNotes,
+  }) {
+    return Order(
+      id: id ?? this.id,
+      customerName: customerName ?? this.customerName,
+      customerEmail: customerEmail ?? this.customerEmail,
+      customerPhone: customerPhone ?? this.customerPhone,
+      orderDate: orderDate ?? this.orderDate,
+      status: status ?? this.status,
+      items: items ?? this.items,
+      shippingAddress: shippingAddress ?? this.shippingAddress,
+      notes: notes ?? this.notes,
+      orderNotes: orderNotes ?? this.orderNotes,
+    );
+  }
 }
diff --git a/kell_creations_apps/packages/feature_orders/lib/src/domain/order_action_result.dart b/kell_creations_apps/packages/feature_orders/lib/src/domain/order_action_result.dart
new file mode 100644
index 0000000..6ded9e6
--- /dev/null
+++ b/kell_creations_apps/packages/feature_orders/lib/src/domain/order_action_result.dart
@@ -0,0 +1,23 @@
+import 'order.dart';
+
+/// The result of an order write operation (status update, note addition, etc.).
+class OrderActionResult {
+  /// Whether the operation succeeded.
+  final bool success;
+
+  /// The updated [Order] after the operation, or `null` on failure.
+  final Order? updatedOrder;
+
+  /// A human-readable error message when [success] is `false`.
+  final String? errorMessage;
+
+  const OrderActionResult.success(Order order)
+    : success = true,
+      updatedOrder = order,
+      errorMessage = null;
+
+  const OrderActionResult.failure(String message)
+    : success = false,
+      updatedOrder = null,
+      errorMessage = message;
+}
diff --git a/kell_creations_apps/packages/feature_orders/lib/src/domain/orders_repository.dart b/kell_creations_apps/packages/feature_orders/lib/src/domain/orders_repository.dart
index e6be39b..dfe9166 100644
--- a/kell_creations_apps/packages/feature_orders/lib/src/domain/orders_repository.dart
+++ b/kell_creations_apps/packages/feature_orders/lib/src/domain/orders_repository.dart
@@ -1,7 +1,24 @@
 import 'order.dart';
+import 'order_action_result.dart';
+import 'order_status.dart';
 
 /// Contract for fetching and managing customer orders.
 abstract class OrdersRepository {
   /// Returns all orders.
   Future<List<Order>> getOrders();
+
+  /// Updates the status of the order identified by [id].
+  ///
+  /// Returns an [OrderActionResult] indicating success or failure.
+  Future<OrderActionResult> updateOrderStatus(String id, OrderStatus newStatus);
+
+  /// Appends a note to the order identified by [id].
+  ///
+  /// Returns an [OrderActionResult] with the updated order on success.
+  Future<OrderActionResult> addOrderNote(String id, String note);
+
+  /// Creates a new order and persists it.
+  ///
+  /// Returns an [OrderActionResult] with the created order on success.
+  Future<OrderActionResult> createOrder(Order order);
 }
diff --git a/kell_creations_apps/packages/feature_orders/test/fake_orders_repository_test.dart b/kell_creations_apps/packages/feature_orders/test/fake_orders_repository_test.dart
index 3658985..8f315c9 100644
--- a/kell_creations_apps/packages/feature_orders/test/fake_orders_repository_test.dart
+++ b/kell_creations_apps/packages/feature_orders/test/fake_orders_repository_test.dart
@@ -9,7 +9,7 @@ void main() {
     repository = FakeOrdersRepository();
   });
 
-  group('FakeOrdersRepository', () {
+  group('FakeOrdersRepository — read', () {
     test('getOrders returns six sample orders', () async {
       final orders = await repository.getOrders();
       expect(orders.length, 6);
@@ -49,5 +49,170 @@ void main() {
       final order1001 = orders.firstWhere((o) => o.id == 'KC-1001');
       expect(order1001.itemCount, 3);
     });
+
+    test('some orders have customerPhone set', () async {
+      final orders = await repository.getOrders();
+      final withPhone = orders.where((o) => o.customerPhone != null).toList();
+      expect(withPhone, isNotEmpty);
+    });
+  });
+
+  group('FakeOrdersRepository — updateOrderStatus', () {
+    test('updates status of existing order', () async {
+      final result = await repository.updateOrderStatus('KC-1004', OrderStatus.processing);
+
+      expect(result.success, true);
+      expect(result.updatedOrder!.id, 'KC-1004');
+      expect(result.updatedOrder!.status, OrderStatus.processing);
+    });
+
+    test('persists status change across subsequent getOrders calls', () async {
+      await repository.updateOrderStatus('KC-1004', OrderStatus.shipped);
+
+      final orders = await repository.getOrders();
+      final updated = orders.firstWhere((o) => o.id == 'KC-1004');
+      expect(updated.status, OrderStatus.shipped);
+    });
+
+    test('returns failure for unknown order ID', () async {
+      final result = await repository.updateOrderStatus('UNKNOWN', OrderStatus.processing);
+
+      expect(result.success, false);
+      expect(result.errorMessage, isNotNull);
+    });
+
+    test('can update to any valid status', () async {
+      for (final status in OrderStatus.values) {
+        final result = await repository.updateOrderStatus('KC-1001', status);
+        expect(result.success, true);
+        expect(result.updatedOrder!.status, status);
+      }
+    });
+  });
+
+  group('FakeOrdersRepository — addOrderNote', () {
+    test('adds note to existing order', () async {
+      final result = await repository.addOrderNote('KC-1001', 'Please gift wrap.');
+
+      expect(result.success, true);
+      expect(result.updatedOrder!.orderNotes, contains('Please gift wrap.'));
+    });
+
+    test('trims whitespace from note', () async {
+      final result = await repository.addOrderNote('KC-1001', '  Trimmed note.  ');
+
+      expect(result.updatedOrder!.orderNotes, contains('Trimmed note.'));
+    });
+
+    test('persists note across subsequent getOrders calls', () async {
+      await repository.addOrderNote('KC-1001', 'Persistent note.');
+
+      final orders = await repository.getOrders();
+      final order = orders.firstWhere((o) => o.id == 'KC-1001');
+      expect(order.orderNotes, contains('Persistent note.'));
+    });
+
+    test('multiple notes accumulate in order', () async {
+      await repository.addOrderNote('KC-1001', 'First.');
+      await repository.addOrderNote('KC-1001', 'Second.');
+
+      final orders = await repository.getOrders();
+      final order = orders.firstWhere((o) => o.id == 'KC-1001');
+      expect(order.orderNotes.length, 2);
+      expect(order.orderNotes[0], 'First.');
+      expect(order.orderNotes[1], 'Second.');
+    });
+
+    test('returns failure for empty note', () async {
+      final result = await repository.addOrderNote('KC-1001', '   ');
+
+      expect(result.success, false);
+      expect(result.errorMessage, isNotNull);
+    });
+
+    test('returns failure for unknown order ID', () async {
+      final result = await repository.addOrderNote('UNKNOWN', 'Some note.');
+
+      expect(result.success, false);
+      expect(result.errorMessage, isNotNull);
+    });
+  });
+
+  group('FakeOrdersRepository — createOrder', () {
+    test('creates a new order and returns it', () async {
+      final newOrder = Order(
+        id: 'KC-9999',
+        customerName: 'New Customer',
+        customerEmail: 'new@example.com',
+        orderDate: DateTime(2026, 7, 1),
+        status: OrderStatus.pending,
+        items: const [
+          OrderItem(productName: 'Test Product', sku: 'TP-001', quantity: 1, unitPrice: 15.00),
+        ],
+        shippingAddress: '1 New St, Test City, TC 00000',
+      );
+
+      final result = await repository.createOrder(newOrder);
+
+      expect(result.success, true);
+      expect(result.updatedOrder!.id, 'KC-9999');
+    });
+
+    test('new order appears in subsequent getOrders calls', () async {
+      final newOrder = Order(
+        id: 'KC-8888',
+        customerName: 'Another Customer',
+        customerEmail: 'another@example.com',
+        orderDate: DateTime(2026, 7, 2),
+        status: OrderStatus.pending,
+        items: const [],
+        shippingAddress: '',
+      );
+
+      await repository.createOrder(newOrder);
+
+      final orders = await repository.getOrders();
+      expect(orders.length, 7);
+      expect(orders.any((o) => o.id == 'KC-8888'), true);
+    });
+
+    test('returns failure for duplicate order ID', () async {
+      final duplicate = Order(
+        id: 'KC-1001',
+        customerName: 'Duplicate',
+        customerEmail: 'dup@example.com',
+        orderDate: DateTime(2026, 7, 1),
+        status: OrderStatus.pending,
+        items: const [],
+        shippingAddress: '',
+      );
+
+      final result = await repository.createOrder(duplicate);
+
+      expect(result.success, false);
+      expect(result.errorMessage, isNotNull);
+    });
+
+    test('duplicate rejection does not alter existing order', () async {
+      final orders = await repository.getOrders();
+      final original = orders.firstWhere((o) => o.id == 'KC-1001');
+
+      final duplicate = Order(
+        id: 'KC-1001',
+        customerName: 'Imposter',
+        customerEmail: 'imposter@example.com',
+        orderDate: DateTime(2026, 7, 1),
+        status: OrderStatus.cancelled,
+        items: const [],
+        shippingAddress: '',
+      );
+
+      await repository.createOrder(duplicate);
+
+      final ordersAfter = await repository.getOrders();
+      final unchanged = ordersAfter.firstWhere((o) => o.id == 'KC-1001');
+      expect(unchanged.customerName, original.customerName);
+      expect(unchanged.status, original.status);
+    });
   });
 }
diff --git a/kell_creations_apps/packages/feature_orders/test/feature_orders_test.dart b/kell_creations_apps/packages/feature_orders/test/feature_orders_test.dart
index 7b65c2c..4e88bea 100644
--- a/kell_creations_apps/packages/feature_orders/test/feature_orders_test.dart
+++ b/kell_creations_apps/packages/feature_orders/test/feature_orders_test.dart
@@ -1,11 +1,185 @@
-// This file ensures the barrel export compiles correctly.
+// This file covers domain model tests for the feature_orders package.
 import 'package:flutter_test/flutter_test.dart';
 
 import 'package:feature_orders/feature_orders.dart';
 
 void main() {
+  // ── Order domain model ─────────────────────────────────────────────────
+
+  group('Order', () {
+    final baseOrder = Order(
+      id: 'KC-0001',
+      customerName: 'Test Customer',
+      customerEmail: 'test@example.com',
+      customerPhone: '555-0100',
+      orderDate: DateTime(2026, 1, 1),
+      status: OrderStatus.pending,
+      items: const [
+        OrderItem(productName: 'Widget', sku: 'WG-001', quantity: 2, unitPrice: 10.00),
+        OrderItem(productName: 'Gadget', sku: 'GD-002', quantity: 1, unitPrice: 5.50),
+      ],
+      shippingAddress: '1 Test St, Test City, TC 00000',
+      notes: 'Internal note',
+      orderNotes: const ['Customer note 1'],
+    );
+
+    test('total is sum of all line totals', () {
+      // 2 * 10.00 + 1 * 5.50 = 25.50
+      expect(baseOrder.total, closeTo(25.50, 0.001));
+    });
+
+    test('itemCount is sum of all quantities', () {
+      // 2 + 1 = 3
+      expect(baseOrder.itemCount, 3);
+    });
+
+    test('copyWith replaces status', () {
+      final updated = baseOrder.copyWith(status: OrderStatus.processing);
+      expect(updated.status, OrderStatus.processing);
+      expect(updated.id, baseOrder.id);
+      expect(updated.customerName, baseOrder.customerName);
+    });
+
+    test('copyWith replaces orderNotes', () {
+      final updated = baseOrder.copyWith(orderNotes: ['New note']);
+      expect(updated.orderNotes, ['New note']);
+      expect(updated.status, baseOrder.status);
+    });
+
+    test('copyWith replaces notes', () {
+      final updated = baseOrder.copyWith(notes: 'Updated internal note');
+      expect(updated.notes, 'Updated internal note');
+    });
+
+    test('copyWith replaces customerPhone', () {
+      final updated = baseOrder.copyWith(customerPhone: '555-9999');
+      expect(updated.customerPhone, '555-9999');
+    });
+
+    test('copyWith with no arguments returns equivalent order', () {
+      final copy = baseOrder.copyWith();
+      expect(copy.id, baseOrder.id);
+      expect(copy.customerName, baseOrder.customerName);
+      expect(copy.status, baseOrder.status);
+      expect(copy.orderNotes, baseOrder.orderNotes);
+    });
+
+    test('default orderNotes is empty list', () {
+      final order = Order(
+        id: 'KC-0002',
+        customerName: 'Minimal',
+        customerEmail: 'min@example.com',
+        orderDate: DateTime(2026, 1, 1),
+        status: OrderStatus.pending,
+        items: const [],
+        shippingAddress: '',
+      );
+      expect(order.orderNotes, isEmpty);
+    });
+
+    test('customerPhone defaults to null', () {
+      final order = Order(
+        id: 'KC-0003',
+        customerName: 'No Phone',
+        customerEmail: 'nophone@example.com',
+        orderDate: DateTime(2026, 1, 1),
+        status: OrderStatus.pending,
+        items: const [],
+        shippingAddress: '',
+      );
+      expect(order.customerPhone, isNull);
+    });
+
+    test('notes defaults to null', () {
+      final order = Order(
+        id: 'KC-0004',
+        customerName: 'No Notes',
+        customerEmail: 'nonotes@example.com',
+        orderDate: DateTime(2026, 1, 1),
+        status: OrderStatus.pending,
+        items: const [],
+        shippingAddress: '',
+      );
+      expect(order.notes, isNull);
+    });
+
+    test('total is zero for empty items list', () {
+      final order = Order(
+        id: 'KC-0005',
+        customerName: 'Empty',
+        customerEmail: 'empty@example.com',
+        orderDate: DateTime(2026, 1, 1),
+        status: OrderStatus.pending,
+        items: const [],
+        shippingAddress: '',
+      );
+      expect(order.total, 0.0);
+      expect(order.itemCount, 0);
+    });
+  });
+
+  // ── OrderItem ──────────────────────────────────────────────────────────
+
+  group('OrderItem', () {
+    test('lineTotal is quantity * unitPrice', () {
+      const item = OrderItem(productName: 'Test', sku: 'T-001', quantity: 3, unitPrice: 7.50);
+      expect(item.lineTotal, closeTo(22.50, 0.001));
+    });
+
+    test('lineTotal is zero for zero quantity', () {
+      const item = OrderItem(productName: 'Test', sku: 'T-001', quantity: 0, unitPrice: 10.00);
+      expect(item.lineTotal, 0.0);
+    });
+  });
+
+  // ── OrderStatus ────────────────────────────────────────────────────────
+
+  group('OrderStatus', () {
+    test('all statuses are distinct', () {
+      final statuses = OrderStatus.values.toSet();
+      expect(statuses.length, OrderStatus.values.length);
+    });
+
+    test('contains expected values', () {
+      expect(OrderStatus.values, contains(OrderStatus.pending));
+      expect(OrderStatus.values, contains(OrderStatus.processing));
+      expect(OrderStatus.values, contains(OrderStatus.shipped));
+      expect(OrderStatus.values, contains(OrderStatus.delivered));
+      expect(OrderStatus.values, contains(OrderStatus.cancelled));
+    });
+  });
+
+  // ── OrderActionResult ──────────────────────────────────────────────────
+
+  group('OrderActionResult', () {
+    final sampleOrder = Order(
+      id: 'KC-0001',
+      customerName: 'Test',
+      customerEmail: 'test@example.com',
+      orderDate: DateTime(2026, 1, 1),
+      status: OrderStatus.pending,
+      items: const [],
+      shippingAddress: '',
+    );
+
+    test('success result has success=true and updatedOrder set', () {
+      final result = OrderActionResult.success(sampleOrder);
+      expect(result.success, true);
+      expect(result.updatedOrder, sampleOrder);
+      expect(result.errorMessage, isNull);
+    });
+
+    test('failure result has success=false and errorMessage set', () {
+      const result = OrderActionResult.failure('Something went wrong.');
+      expect(result.success, false);
+      expect(result.updatedOrder, isNull);
+      expect(result.errorMessage, 'Something went wrong.');
+    });
+  });
+
+  // ── Barrel export smoke test ───────────────────────────────────────────
+
   test('barrel export exposes Order', () {
-    // Verify the domain model is accessible through the barrel export.
     final order = Order(
       id: 'test',
       customerName: 'Test',
diff --git a/kell_creations_apps/packages/feature_orders/test/orders_controller_test.dart b/kell_creations_apps/packages/feature_orders/test/orders_controller_test.dart
index 7aa7106..d5013c9 100644
--- a/kell_creations_apps/packages/feature_orders/test/orders_controller_test.dart
+++ b/kell_creations_apps/packages/feature_orders/test/orders_controller_test.dart
@@ -1,7 +1,6 @@
 import 'package:flutter_test/flutter_test.dart';
 
 import 'package:feature_orders/feature_orders.dart';
-import 'package:feature_orders/src/application/get_orders.dart';
 import 'package:feature_orders/src/application/orders_controller.dart';
 
 void main() {
@@ -10,21 +9,30 @@ void main() {
 
   setUp(() {
     repository = FakeOrdersRepository();
-    controller = OrdersController(GetOrders(repository));
+    controller = OrdersController(
+      GetOrders(repository),
+      updateOrderStatus: UpdateOrderStatus(repository),
+      addOrderNote: AddOrderNote(repository),
+      createOrder: CreateOrder(repository),
+    );
   });
 
   tearDown(() {
     controller.dispose();
   });
 
-  group('OrdersController', () {
+  // ── Read-side tests (preserved from original) ──────────────────────────
+
+  group('OrdersController — read', () {
     test('starts with empty state', () {
       expect(controller.isLoading, false);
+      expect(controller.isUpdating, false);
       expect(controller.orders, isEmpty);
       expect(controller.selectedOrder, isNull);
       expect(controller.activeFilter, isNull);
       expect(controller.searchQuery, '');
       expect(controller.error, isNull);
+      expect(controller.lastActionResult, isNull);
     });
 
     test('load populates orders and auto-selects first', () async {
@@ -116,4 +124,261 @@ void main() {
       expect(controller.selectedOrder, isNull);
     });
   });
+
+  // ── Write-side tests ───────────────────────────────────────────────────
+
+  group('OrdersController — updateOrderStatus', () {
+    test('updates status and sets success result', () async {
+      await controller.load();
+      controller.selectById('KC-1004');
+
+      await controller.updateOrderStatus('KC-1004', OrderStatus.processing);
+
+      expect(controller.isUpdating, false);
+      expect(controller.lastActionResult, isNotNull);
+      expect(controller.lastActionResult!.success, true);
+      expect(controller.lastActionResult!.updatedOrder!.status, OrderStatus.processing);
+    });
+
+    test('refreshes selectedOrder after status update', () async {
+      await controller.load();
+      controller.selectById('KC-1004');
+
+      await controller.updateOrderStatus('KC-1004', OrderStatus.processing);
+
+      expect(controller.selectedOrder!.status, OrderStatus.processing);
+    });
+
+    test('reloads order list after status update', () async {
+      await controller.load();
+
+      // Initially 2 pending orders.
+      controller.setFilter('pending');
+      expect(controller.orders.length, 2);
+      controller.setFilter(null);
+
+      await controller.updateOrderStatus('KC-1004', OrderStatus.processing);
+
+      // Now only 1 pending order.
+      controller.setFilter('pending');
+      expect(controller.orders.length, 1);
+    });
+
+    test('sets failure result for unknown order ID', () async {
+      await controller.load();
+
+      await controller.updateOrderStatus('UNKNOWN', OrderStatus.processing);
+
+      expect(controller.lastActionResult!.success, false);
+      expect(controller.lastActionResult!.errorMessage, isNotNull);
+    });
+
+    test('isUpdating is false after completion', () async {
+      await controller.load();
+
+      await controller.updateOrderStatus('KC-1004', OrderStatus.processing);
+
+      expect(controller.isUpdating, false);
+    });
+
+    test('no-op when updateOrderStatus use case is not provided', () async {
+      final readOnlyController = OrdersController(GetOrders(repository));
+      await readOnlyController.load();
+
+      await readOnlyController.updateOrderStatus('KC-1004', OrderStatus.processing);
+
+      // No result set, no error.
+      expect(readOnlyController.lastActionResult, isNull);
+      readOnlyController.dispose();
+    });
+  });
+
+  group('OrdersController — addOrderNote', () {
+    test('adds note and sets success result', () async {
+      await controller.load();
+      controller.selectById('KC-1001');
+
+      await controller.addOrderNote('KC-1001', 'Please gift wrap.');
+
+      expect(controller.lastActionResult!.success, true);
+      expect(controller.lastActionResult!.updatedOrder!.orderNotes, contains('Please gift wrap.'));
+    });
+
+    test('refreshes selectedOrder with new note', () async {
+      await controller.load();
+      controller.selectById('KC-1001');
+
+      await controller.addOrderNote('KC-1001', 'Fragile item.');
+
+      expect(controller.selectedOrder!.orderNotes, contains('Fragile item.'));
+    });
+
+    test('multiple notes accumulate', () async {
+      await controller.load();
+
+      await controller.addOrderNote('KC-1001', 'First note.');
+      await controller.addOrderNote('KC-1001', 'Second note.');
+
+      controller.selectById('KC-1001');
+      expect(controller.selectedOrder!.orderNotes.length, 2);
+    });
+
+    test('sets failure result for empty note', () async {
+      await controller.load();
+
+      await controller.addOrderNote('KC-1001', '   ');
+
+      expect(controller.lastActionResult!.success, false);
+      expect(controller.lastActionResult!.errorMessage, isNotNull);
+    });
+
+    test('sets failure result for unknown order ID', () async {
+      await controller.load();
+
+      await controller.addOrderNote('UNKNOWN', 'Some note.');
+
+      expect(controller.lastActionResult!.success, false);
+    });
+
+    test('no-op when addOrderNote use case is not provided', () async {
+      final readOnlyController = OrdersController(GetOrders(repository));
+      await readOnlyController.load();
+
+      await readOnlyController.addOrderNote('KC-1001', 'Note.');
+
+      expect(readOnlyController.lastActionResult, isNull);
+      readOnlyController.dispose();
+    });
+  });
+
+  group('OrdersController — createOrder', () {
+    test('creates order and adds it to the list', () async {
+      await controller.load();
+      expect(controller.orders.length, 6);
+
+      final newOrder = Order(
+        id: 'KC-9999',
+        customerName: 'New Customer',
+        customerEmail: 'new@example.com',
+        orderDate: DateTime(2026, 7, 1),
+        status: OrderStatus.pending,
+        items: const [
+          OrderItem(productName: 'Test Product', sku: 'TP-001', quantity: 1, unitPrice: 15.00),
+        ],
+        shippingAddress: '1 New St, Test City, TC 00000',
+      );
+
+      await controller.createOrder(newOrder);
+
+      expect(controller.lastActionResult!.success, true);
+      expect(controller.orders.length, 7);
+    });
+
+    test('new order appears in list after creation', () async {
+      await controller.load();
+
+      final newOrder = Order(
+        id: 'KC-8888',
+        customerName: 'Another Customer',
+        customerEmail: 'another@example.com',
+        orderDate: DateTime(2026, 7, 2),
+        status: OrderStatus.pending,
+        items: const [
+          OrderItem(productName: 'Widget', sku: 'WG-001', quantity: 2, unitPrice: 9.99),
+        ],
+        shippingAddress: '2 Another St, Test City, TC 00000',
+      );
+
+      await controller.createOrder(newOrder);
+
+      final ids = controller.orders.map((o) => o.id).toList();
+      expect(ids, contains('KC-8888'));
+    });
+
+    test('sets failure result for duplicate order ID', () async {
+      await controller.load();
+
+      final duplicate = Order(
+        id: 'KC-1001',
+        customerName: 'Duplicate',
+        customerEmail: 'dup@example.com',
+        orderDate: DateTime(2026, 7, 1),
+        status: OrderStatus.pending,
+        items: const [],
+        shippingAddress: '',
+      );
+
+      await controller.createOrder(duplicate);
+
+      expect(controller.lastActionResult!.success, false);
+      expect(controller.lastActionResult!.errorMessage, isNotNull);
+    });
+
+    test('no-op when createOrder use case is not provided', () async {
+      final readOnlyController = OrdersController(GetOrders(repository));
+      await readOnlyController.load();
+
+      final newOrder = Order(
+        id: 'KC-7777',
+        customerName: 'Test',
+        customerEmail: 'test@example.com',
+        orderDate: DateTime(2026, 7, 1),
+        status: OrderStatus.pending,
+        items: const [],
+        shippingAddress: '',
+      );
+
+      await readOnlyController.createOrder(newOrder);
+
+      expect(readOnlyController.lastActionResult, isNull);
+      expect(readOnlyController.orders.length, 6);
+      readOnlyController.dispose();
+    });
+  });
+
+  group('OrdersController — consumeActionResult', () {
+    test('consume clears lastActionResult', () async {
+      await controller.load();
+      await controller.updateOrderStatus('KC-1004', OrderStatus.processing);
+
+      expect(controller.lastActionResult, isNotNull);
+      final consumed = controller.consumeActionResult();
+      expect(consumed, isNotNull);
+      expect(controller.lastActionResult, isNull);
+    });
+
+    test('consume returns null when no result pending', () async {
+      final result = controller.consumeActionResult();
+      expect(result, isNull);
+    });
+
+    test('lastActionResult starts null', () {
+      expect(controller.lastActionResult, isNull);
+    });
+  });
+
+  group('OrdersController — filter/search persistence after writes', () {
+    test('active filter is preserved after status update', () async {
+      await controller.load();
+      controller.setFilter('pending');
+      expect(controller.orders.length, 2);
+
+      await controller.updateOrderStatus('KC-1004', OrderStatus.processing);
+
+      // Filter should still be active; now only 1 pending order.
+      expect(controller.activeFilter, 'pending');
+      expect(controller.orders.length, 1);
+    });
+
+    test('search query is preserved after note addition', () async {
+      await controller.load();
+      controller.setSearchQuery('sarah');
+      expect(controller.orders.length, 1);
+
+      await controller.addOrderNote('KC-1001', 'Test note.');
+
+      expect(controller.searchQuery, 'sarah');
+      expect(controller.orders.length, 1);
+    });
+  });
 }
diff --git a/kell_creations_apps/tools/run_all_tests.sh b/kell_creations_apps/tools/run_all_tests.sh
index 0c7206b..580b917 100644
--- a/kell_creations_apps/tools/run_all_tests.sh
+++ b/kell_creations_apps/tools/run_all_tests.sh
@@ -20,7 +20,10 @@ TESTABLE=(
   packages/core
   packages/design_system
   packages/feature_wordpress
+  packages/feature_inventory
+  packages/feature_orders
   apps/kell_web
+  apps/kell_mobile
 )
 
 # All packages/apps to analyze (includes those without tests)