diff --git a/e2e/testcafe-devextreme/tests/dataGrid/common/aiAssistant/errorHandling.functional.ts b/e2e/testcafe-devextreme/tests/dataGrid/common/aiAssistant/errorHandling.functional.ts
new file mode 100644
index 000000000000..24daf421e63a
--- /dev/null
+++ b/e2e/testcafe-devextreme/tests/dataGrid/common/aiAssistant/errorHandling.functional.ts
@@ -0,0 +1,351 @@
+/* eslint-disable no-underscore-dangle */
+import DataGrid from 'devextreme-testcafe-models/dataGrid';
+import { ClientFunction } from 'testcafe';
+import { createWidget } from '../../../../helpers/createWidget';
+import {
+  AI_INTEGRATION_PAGE,
+  FAIL,
+  GRID_SELECTOR,
+  baseGrid as gridDefaults,
+  createGridWithAIAssistant,
+  getLoggedErrorIds,
+  setupAIState,
+  threeRows,
+} from './testHelpers';
+
+type AIChat = ReturnType<DataGrid['getAIAssistantChat']>;
+
+const baseGrid = { ...gridDefaults, dataSource: threeRows };
+
+const groupingLockedColumns = [
+  { dataField: 'id' },
+  { dataField: 'name', allowGrouping: false },
+  { dataField: 'value' },
+];
+
+const formatMessage = ClientFunction(
+  (key: string) => (window as any).DevExpress.localization.formatMessage(key),
+);
+
+const invalidResponse = (): Promise<string> => formatMessage(
+  'dxDataGrid-aiAssistantInvalidResponseMessage',
+);
+
+const errorHeader = (): Promise<string> => formatMessage(
+  'dxDataGrid-aiAssistantErrorMessageHeader',
+);
+
+const getSelectedRowsCount = ClientFunction(
+  () => (window as any).widget.getSelectedRowsData().length,
+);
+
+const noIntegrationOptions = (): any => ({
+  ...(window as any).__aiBase,
+  aiAssistant: { enabled: true },
+});
+
+const createGridWithoutIntegration = async (
+  base: Record<string, unknown>,
+): Promise<void> => {
+  await setupAIState(base, []);
+
+  return createWidget('dxDataGrid', noIntegrationOptions);
+};
+
+const openChatAndSubmit = async (
+  t: TestController,
+  prompt: string,
+): Promise<{ dataGrid: DataGrid; aiChat: AIChat }> => {
+  const dataGrid = new DataGrid(GRID_SELECTOR);
+
+  await t.expect(dataGrid.isReady()).ok();
+
+  await t.click(dataGrid.getAIAssistantButton());
+
+  const aiChat = dataGrid.getAIAssistantChat();
+
+  await t
+    .typeText(aiChat.getInput(), prompt)
+    .pressKey('enter');
+
+  return { dataGrid, aiChat };
+};
+
+const expectInvalidResponse = async (
+  t: TestController,
+  aiChat: AIChat,
+  dataGrid: DataGrid,
+): Promise<void> => {
+  await t.expect(aiChat.getMessages().count).eql(2);
+  await t.expect(aiChat.getErrorMessages().count).eql(1);
+  await t.expect(aiChat.getMessageHeader(0).innerText).eql(await errorHeader());
+  await t.expect(aiChat.getMessageErrorText(0).innerText).eql(await invalidResponse());
+  await t.expect(aiChat.getSuccessMessages().count).eql(0);
+  await t.expect(aiChat.getActionItems(0).count).eql(0);
+  await t.expect(dataGrid.apiColumnOption('name', 'sortOrder')).notOk();
+};
+
+fixture`AI Assistant - Error Handling`
+  .page(AI_INTEGRATION_PAGE);
+
+test('Empty actions array should show no-action message and leave grid unchanged', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Tell me a joke');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: [] }],
+));
+
+test('Sorting by a non-existent column should fail: schema is valid but incompatible with grid state', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by Salary');
+
+  await t.expect(aiChat.getMessages().count).eql(2);
+  await t.expect(aiChat.getSuccessMessages().count).eql(0);
+  await t.expect(aiChat.getErrorMessages().count).eql(1);
+  await t.expect(aiChat.getErrorActionItems(0).count).eql(1);
+  await t.expect(dataGrid.apiGetDataSourceSortParams()).notOk();
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: [{ name: 'sorting', args: { dataField: 'Salary', sortOrder: 'asc' } }] }],
+));
+
+test('Selecting non-existent keys should succeed: schema is valid and the missing data is not sent in the request', async (t) => {
+  const { aiChat } = await openChatAndSubmit(t, 'Select rows 999 and 1000');
+
+  await t.expect(aiChat.getMessages().count).eql(2);
+  await t.expect(aiChat.getErrorMessages().count).eql(0);
+  await t.expect(aiChat.getSuccessMessages().count).eql(1);
+  await t.expect(aiChat.getSuccessActionItems(0).count).eql(1);
+  await t.expect(getSelectedRowsCount()).eql(0);
+}).before(async () => createGridWithAIAssistant(
+  { ...baseGrid, selection: { mode: 'multiple' } },
+  [{ actions: [{ name: 'selectByKeys', args: { keys: [999, 1000], preserve: false } }] }],
+));
+
+test('sendRequest rejection should show error message and leave grid unchanged', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [FAIL],
+));
+
+test('Missing aiIntegration should show an error and leave grid unchanged', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+  await t.expect(await getLoggedErrorIds(t)).contains('E1068');
+}).before(async () => createGridWithoutIntegration(baseGrid));
+
+test('Non-JSON string response should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  ['not json'],
+));
+
+test('Non-JSON actions string should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: 'not json' }],
+));
+
+test('Empty string response should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [''],
+));
+
+test('Response missing actions should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{}],
+));
+
+test('Object actions (not array) should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: { name: 'sorting' } }],
+));
+
+test('Null actions should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: null }],
+));
+
+test('Primitive actions should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: 42 }],
+));
+
+test('Null response should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [null],
+));
+
+test('Unknown command name should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: [{ name: 'unknownCmd', args: {} }] }],
+));
+
+test('Non-string command name should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: [{ name: 123, args: {} }] }],
+));
+
+test('Empty command name should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: [{ name: '', args: {} }] }],
+));
+
+test('Action without name should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: [{ args: {} }] }],
+));
+
+test('Action without args should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: [{ name: 'sorting' }] }],
+));
+
+test('Null args should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: [{ name: 'sorting', args: null }] }],
+));
+
+test('Args missing a required property should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: [{ name: 'sorting', args: { sortOrder: 'asc' } }] }],
+));
+
+test('Args with a wrong-typed property should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(baseGrid, [{ actions: [{ name: 'sorting', args: { dataField: 'name', sortOrder: 123 } }] }]));
+
+test('Args with an extra property should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(baseGrid, [{ actions: [{ name: 'sorting', args: { dataField: 'name', sortOrder: 'asc', foo: 'bar' } }] }]));
+
+test('Mix of valid and invalid actions should reject the whole response', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort by name');
+
+  // expectInvalidResponse also asserts the valid sorting action did NOT execute.
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(baseGrid, [{
+  actions: [
+    { name: 'sorting', args: { dataField: 'name', sortOrder: 'asc' } },
+    { name: 'unknownCmd', args: {} },
+  ],
+}]));
+
+test('No-arg command with non-empty args should show invalid-response error', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Clear sorting');
+
+  await expectInvalidResponse(t, aiChat, dataGrid);
+}).before(async () => createGridWithAIAssistant(
+  baseGrid,
+  [{ actions: [{ name: 'clearSorting', args: { foo: 1 } }] }],
+));
+
+test('Partial failure should report each action status and apply successes', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Sort, group and search');
+
+  await t.expect(aiChat.getMessages().count).eql(2);
+  await t.expect(aiChat.getErrorMessages().count).eql(1);
+  await t.expect(aiChat.getActionItems(0).count).eql(3);
+  await t.expect(aiChat.getSuccessActionItems(0).count).eql(2);
+  await t.expect(aiChat.getErrorActionItems(0).count).eql(1);
+  // The failed grouping action carries its predefined per-command message.
+  await t.expect(aiChat.getActionItemText(0, 1).innerText).contains('Group data against');
+  // Successful actions (#1 sorting, #3 searching) took effect; failed grouping did not.
+  await t.expect(dataGrid.apiColumnOption('name', 'sortOrder')).eql('asc');
+  await t.expect(dataGrid.apiColumnOption('name', 'groupIndex')).eql(undefined);
+  await t.expect(dataGrid.apiOption('searchPanel.text')).eql('Alice');
+}).before(async () => createGridWithAIAssistant({ ...baseGrid, columns: groupingLockedColumns }, [{
+  actions: [
+    { name: 'sorting', args: { dataField: 'name', sortOrder: 'asc' } },
+    { name: 'grouping', args: { dataField: 'name', groupIndex: 0 } },
+    { name: 'searching', args: { text: 'Alice' } },
+  ],
+}]));
+
+test('All-commands failure should report failures and leave grid unchanged', async (t) => {
+  const { dataGrid, aiChat } = await openChatAndSubmit(t, 'Do impossible things');
+
+  await t.expect(aiChat.getMessages().count).eql(2);
+  await t.expect(aiChat.getErrorMessages().count).eql(1);
+  await t.expect(aiChat.getActionItems(0).count).eql(3);
+  await t.expect(aiChat.getSuccessActionItems(0).count).eql(0);
+  await t.expect(aiChat.getErrorActionItems(0).count).eql(3);
+  // Each failed action keeps its own predefined per-command message.
+  await t.expect(aiChat.getActionItemText(0, 0).innerText).contains('Sort data against');
+  await t.expect(aiChat.getActionItemText(0, 2).innerText).contains('Group data against');
+  await t.expect(dataGrid.apiColumnOption('name', 'sortOrder')).notOk();
+  await t.expect(dataGrid.apiColumnOption('name', 'groupIndex')).eql(undefined);
+}).before(async () => createGridWithAIAssistant({ ...baseGrid, columns: groupingLockedColumns }, [{
+  actions: [
+    { name: 'sorting', args: { dataField: 'NopeOne', sortOrder: 'asc' } },
+    { name: 'sorting', args: { dataField: 'NopeTwo', sortOrder: 'desc' } },
+    { name: 'grouping', args: { dataField: 'name', groupIndex: 0 } },
+  ],
+}]));
diff --git a/e2e/testcafe-devextreme/tests/dataGrid/common/aiAssistant/testHelpers.ts b/e2e/testcafe-devextreme/tests/dataGrid/common/aiAssistant/testHelpers.ts
index 9ba16903336b..5c94d73cc7b7 100644
--- a/e2e/testcafe-devextreme/tests/dataGrid/common/aiAssistant/testHelpers.ts
+++ b/e2e/testcafe-devextreme/tests/dataGrid/common/aiAssistant/testHelpers.ts
@@ -103,3 +103,11 @@ export const createGridWithAIAssistant = async (
 };
 
 export const getRequests = ClientFunction(() => (window as any).__aiRequests);
+
+export const getLoggedErrorIds = async (t: TestController): Promise<string[]> => {
+  const consoleMessages = await t.getBrowserConsoleMessages();
+
+  return (consoleMessages?.error ?? [])
+    .map((message) => /^E\d+/.exec(message)?.[0])
+    .filter((id): id is string => id !== undefined);
+};