diff --git a/src/tui/controller.ts b/src/tui/controller.ts
index 53b9ff09..f0f66874 100644
--- a/src/tui/controller.ts
+++ b/src/tui/controller.ts
@@ -2693,6 +2693,14 @@ function updateDetailForIndex(idx: number, visible?: VisibleNode[]) {
     };
     try { (list as any).__opencode_select = listSelectHandler; list.on('select', listSelectHandler); } catch (_) {}
 
+    // 'select item' fires via List.prototype.select() for ALL selection changes,
+    // including mouse clicks on a different item (where 'select' is NOT emitted).
+    // This is the primary handler that fixes mouse click-to-select.
+    const listSelectItemHandler = (_item: any, idx: number) => {
+      updateListSelection(idx, 'select-item');
+    };
+    try { (list as any).__opencode_select_item = listSelectItemHandler; list.on('select item', listSelectItemHandler); } catch (_) {}
+
     // Update details immediately when navigating with keys or mouse
     const listKeypressHandler = (_ch: any, key: any) => {
       try {
diff --git a/tests/tui/tui-mouse-select.test.ts b/tests/tui/tui-mouse-select.test.ts
new file mode 100644
index 00000000..a115f8a1
--- /dev/null
+++ b/tests/tui/tui-mouse-select.test.ts
@@ -0,0 +1,306 @@
+/**
+ * Regression tests for TUI mouse click-to-select.
+ *
+ * Selecting a work item via mouse click should update the detail pane content,
+ * exactly as arrow-key navigation does.  The regression was that clicking a
+ * *different* item than the currently selected one never fired the 'select'
+ * event; it fires 'select item' via List.prototype.select() instead.
+ */
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { TuiController } from '../../src/tui/controller.js';
+
+// ── Minimal blessed mocks ─────────────────────────────────────────────
+
+const makeBox = () => ({
+  hidden: true,
+  width: 0,
+  height: 0,
+  style: { border: {} as Record<string, any>, label: {} as Record<string, any>, selected: {} },
+  show: vi.fn(function () { (this as any).hidden = false; }),
+  hide: vi.fn(function () { (this as any).hidden = true; }),
+  focus: vi.fn(),
+  setFront: vi.fn(),
+  setContent: vi.fn(),
+  getContent: vi.fn(() => ''),
+  setLabel: vi.fn(),
+  setItems: vi.fn(),
+  select: vi.fn(),
+  getItem: vi.fn(() => undefined),
+  on: vi.fn(),
+  key: vi.fn(),
+  setScroll: vi.fn(),
+  setScrollPerc: vi.fn(),
+  getScroll: vi.fn(() => 0),
+  pushLine: vi.fn(),
+  clearValue: vi.fn(),
+  setValue: vi.fn(),
+  getValue: vi.fn(() => ''),
+  moveCursor: vi.fn(),
+});
+
+const makeList = () => {
+  const list = makeBox() as any;
+  let selected = 0;
+  let items: string[] = [];
+  // Track 'select item' listeners so tests can fire them directly
+  const selectItemListeners: Array<(...args: any[]) => void> = [];
+  list.setItems = vi.fn((next: string[]) => {
+    items = next.slice();
+    list.items = items.map(value => ({ getContent: () => value }));
+  });
+  list.select = vi.fn((idx: number) => { selected = idx; });
+  Object.defineProperty(list, 'selected', {
+    get: () => selected,
+    set: (value: number) => { selected = value; },
+  });
+  list.getItem = vi.fn((idx: number) => {
+    const value = items[idx];
+    return value ? { getContent: () => value } : undefined;
+  });
+  list.items = [] as any[];
+  // Intercept on() calls so we can retrieve 'select item' listeners
+  list.on = vi.fn((ev: string, cb: (...args: any[]) => void) => {
+    if (ev === 'select item') selectItemListeners.push(cb);
+  });
+  list._selectItemListeners = selectItemListeners;
+  return list;
+};
+
+const makeScreen = () => ({
+  height: 40,
+  width: 120,
+  focused: null as any,
+  render: vi.fn(),
+  destroy: vi.fn(),
+  key: vi.fn(),
+  on: vi.fn(),
+});
+
+// ── Helpers ───────────────────────────────────────────────────────────
+
+function makeItem(id: string) {
+  const now = new Date().toISOString();
+  return {
+    id,
+    title: `Item ${id}`,
+    description: `Description for ${id}`,
+    status: 'open',
+    priority: 'medium',
+    sortIndex: 0,
+    parentId: null,
+    createdAt: now,
+    updatedAt: now,
+    tags: [],
+    assignee: '',
+    stage: '',
+    issueType: 'task',
+    createdBy: '',
+    deletedBy: '',
+    deleteReason: '',
+    risk: '',
+    effort: '',
+    needsProducerReview: false,
+  };
+}
+
+function buildLayout(screen: any) {
+  const list = makeList();
+  const footer = makeBox();
+  const detail = makeBox();
+  const copyIdButton = makeBox();
+  const metadataBox = makeBox();
+  const updateFromItemMock = vi.fn();
+  const overlays = {
+    detailOverlay: makeBox(),
+    closeOverlay: makeBox(),
+    updateOverlay: makeBox(),
+  };
+  const dialogs = {
+    detailModal: makeBox(),
+    detailClose: makeBox(),
+    closeDialog: makeBox(),
+    closeDialogText: makeBox(),
+    closeDialogOptions: makeList(),
+    updateDialog: makeBox(),
+    updateDialogText: makeBox(),
+    updateDialogOptions: makeList(),
+    updateDialogStageOptions: makeList(),
+    updateDialogStatusOptions: makeList(),
+    updateDialogPriorityOptions: makeList(),
+    updateDialogComment: makeBox(),
+  };
+  const helpMenu = { isVisible: vi.fn(() => false), show: vi.fn(), hide: vi.fn() };
+  const modalDialogs = {
+    selectList: vi.fn(async () => 0),
+    editTextarea: vi.fn(async () => null),
+    confirmTextbox: vi.fn(async () => false),
+    forceCleanup: vi.fn(),
+  };
+  const opencodeUi = {
+    serverStatusBox: makeBox(),
+    dialog: makeBox(),
+    textarea: makeBox(),
+    suggestionHint: makeBox(),
+    sendButton: makeBox(),
+    cancelButton: makeBox(),
+    ensureResponsePane: vi.fn(() => makeBox()),
+  };
+
+  return {
+    screen,
+    list,
+    detail,
+    metadataBox,
+    updateFromItemMock,
+    layout: {
+      screen,
+      listComponent: { getList: () => list, getFooter: () => footer },
+      detailComponent: { getDetail: () => detail, getCopyIdButton: () => copyIdButton },
+      metadataPaneComponent: { getBox: () => metadataBox, updateFromItem: updateFromItemMock },
+      toastComponent: { show: vi.fn() } as any,
+      overlaysComponent: overlays,
+      dialogsComponent: dialogs,
+      helpMenu,
+      modalDialogs,
+      opencodeUi,
+      nextDialog: { overlay: makeBox(), dialog: makeBox(), close: makeBox(), text: makeBox(), options: makeList() },
+    },
+  };
+}
+
+function buildCtx(items: any[]) {
+  return {
+    ctx: {
+      program: { opts: () => ({ verbose: false }) },
+      utils: {
+        requireInitialized: vi.fn(),
+        getDatabase: vi.fn(() => ({
+          list: () => items,
+          getPrefix: () => 'test-prefix',
+          getCommentsForWorkItem: () => [],
+          update: () => ({}),
+          createComment: () => ({}),
+          get: (id: string) => items.find(i => i.id === id) ?? null,
+        })),
+      },
+    } as any,
+  };
+}
+
+class FakeOpencodeClient {
+  getStatus() { return { status: 'stopped', port: 9999 }; }
+  startServer() { return Promise.resolve(true); }
+  stopServer() { return undefined; }
+  sendPrompt() { return Promise.resolve(); }
+}
+
+// ── Tests ─────────────────────────────────────────────────────────────
+
+describe('TUI mouse click-to-select (regression)', () => {
+  beforeEach(() => { vi.clearAllMocks(); });
+
+  it('updates detail pane when user clicks a different list item (select item event)', async () => {
+    const item1 = makeItem('WL-MOUSE-1');
+    const item2 = makeItem('WL-MOUSE-2');
+    const screen = makeScreen();
+    const { layout, detail, list } = buildLayout(screen);
+    const { ctx } = buildCtx([item1, item2]);
+
+    const controller = new TuiController(ctx, {
+      createLayout: () => layout as any,
+      OpencodeClient: FakeOpencodeClient as any,
+      resolveWorklogDir: () => '/tmp/test-worklog',
+      createPersistence: () => ({
+        loadPersistedState: async () => null,
+        savePersistedState: async () => undefined,
+        statePath: '/tmp/tui-state.json',
+      }),
+    });
+
+    await controller.start({});
+
+    // The 'select item' handler is stored via __opencode_select_item
+    const selectItemHandler = (list as any).__opencode_select_item;
+    expect(typeof selectItemHandler).toBe('function');
+
+    // Record the initial detail content shown for item 1 (index 0)
+    const initialContent = (detail.setContent as any).mock.calls.slice(-1)[0]?.[0] ?? '';
+
+    // Reset mock to detect the update triggered by clicking item 2
+    (detail.setContent as any).mockClear();
+
+    // Simulate blessed's 'select item' event for item at index 1 (item2)
+    // This is what blessed fires when the user clicks a different list item.
+    const item2Element = list.items?.[1] ?? {};
+    selectItemHandler(item2Element, 1);
+
+    // The detail pane must be updated
+    expect(detail.setContent).toHaveBeenCalled();
+    const updatedContent: string = (detail.setContent as any).mock.calls[0][0] ?? '';
+    // The updated content must mention item2's id
+    expect(updatedContent).toContain('WL-MOUSE-2');
+    // And must differ from the initial (item1) content
+    expect(updatedContent).not.toBe(initialContent);
+  });
+
+  it('does not reset scroll position when clicking the already-selected item', async () => {
+    const item1 = makeItem('WL-MOUSE-3');
+    const screen = makeScreen();
+    const { layout, detail, list } = buildLayout(screen);
+    const { ctx } = buildCtx([item1]);
+
+    const controller = new TuiController(ctx, {
+      createLayout: () => layout as any,
+      OpencodeClient: FakeOpencodeClient as any,
+      resolveWorklogDir: () => '/tmp/test-worklog',
+      createPersistence: () => ({
+        loadPersistedState: async () => null,
+        savePersistedState: async () => undefined,
+        statePath: '/tmp/tui-state.json',
+      }),
+    });
+
+    await controller.start({});
+
+    (detail.setScroll as any).mockClear();
+
+    // Simulate clicking the already-selected item (index 0)
+    const selectItemHandler = (list as any).__opencode_select_item;
+    if (typeof selectItemHandler === 'function') {
+      selectItemHandler(list.items?.[0] ?? {}, 0);
+    }
+
+    // The scroll should NOT be reset when re-selecting the same item
+    expect(detail.setScroll).not.toHaveBeenCalled();
+  });
+
+  it('registers __opencode_select_item handler on startup', async () => {
+    const item = makeItem('WL-MOUSE-4');
+    const screen = makeScreen();
+    const { layout, list } = buildLayout(screen);
+    const { ctx } = buildCtx([item]);
+
+    const controller = new TuiController(ctx, {
+      createLayout: () => layout as any,
+      OpencodeClient: FakeOpencodeClient as any,
+      resolveWorklogDir: () => '/tmp/test-worklog',
+      createPersistence: () => ({
+        loadPersistedState: async () => null,
+        savePersistedState: async () => undefined,
+        statePath: '/tmp/tui-state.json',
+      }),
+    });
+
+    await controller.start({});
+
+    // Verify the handler was registered
+    expect((list as any).__opencode_select_item).toBeDefined();
+    expect(typeof (list as any).__opencode_select_item).toBe('function');
+
+    // Verify it was registered via list.on('select item', ...)
+    const onCalls = (list.on as any).mock.calls;
+    const selectItemCall = onCalls.find((c: any[]) => c[0] === 'select item');
+    expect(selectItemCall).toBeDefined();
+    expect(typeof selectItemCall?.[1]).toBe('function');
+  });
+});