diff --git a/src/ClaudeDo.Ui/ClaudeDo.Ui.csproj b/src/ClaudeDo.Ui/ClaudeDo.Ui.csproj
index 2ea6f07..7a19886 100644
--- a/src/ClaudeDo.Ui/ClaudeDo.Ui.csproj
+++ b/src/ClaudeDo.Ui/ClaudeDo.Ui.csproj
@@ -15,6 +15,7 @@
 
   <ItemGroup>
     <InternalsVisibleTo Include="ClaudeDo.Ui.Tests" />
+    <InternalsVisibleTo Include="ClaudeDo.Worker.Tests" />
   </ItemGroup>
 
   <PropertyGroup>
diff --git a/src/ClaudeDo.Ui/Services/IWorkerClient.cs b/src/ClaudeDo.Ui/Services/IWorkerClient.cs
new file mode 100644
index 0000000..a904c50
--- /dev/null
+++ b/src/ClaudeDo.Ui/Services/IWorkerClient.cs
@@ -0,0 +1,10 @@
+namespace ClaudeDo.Ui.Services;
+
+public interface IWorkerClient
+{
+    Task WakeQueueAsync();
+    Task StartPlanningSessionAsync(string taskId, CancellationToken ct = default);
+    Task ResumePlanningSessionAsync(string taskId, CancellationToken ct = default);
+    Task DiscardPlanningSessionAsync(string taskId, CancellationToken ct = default);
+    Task FinalizePlanningSessionAsync(string taskId, bool queueAgentTasks = true, CancellationToken ct = default);
+}
diff --git a/src/ClaudeDo.Ui/Services/WorkerClient.cs b/src/ClaudeDo.Ui/Services/WorkerClient.cs
index 56775c3..57566e6 100644
--- a/src/ClaudeDo.Ui/Services/WorkerClient.cs
+++ b/src/ClaudeDo.Ui/Services/WorkerClient.cs
@@ -25,7 +25,7 @@ sealed class IndefiniteRetryPolicy : IRetryPolicy
         _delays[Math.Min(retryContext.PreviousRetryCount, _delays.Length - 1)];
 }
 
-public partial class WorkerClient : ObservableObject, IAsyncDisposable
+public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerClient
 {
     private readonly HubConnection _hub;
     private CancellationTokenSource? _startCts;
@@ -362,6 +362,16 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable
     public async Task<int> GetPendingDraftCountAsync(string taskId, CancellationToken ct = default)
         => await _hub.InvokeAsync<int>("GetPendingDraftCountAsync", taskId, ct);
 
+    // IWorkerClient explicit implementations (drop typed return values)
+    async Task IWorkerClient.StartPlanningSessionAsync(string taskId, CancellationToken ct)
+        => await StartPlanningSessionAsync(taskId, ct);
+    async Task IWorkerClient.ResumePlanningSessionAsync(string taskId, CancellationToken ct)
+        => await ResumePlanningSessionAsync(taskId, ct);
+    async Task IWorkerClient.DiscardPlanningSessionAsync(string taskId, CancellationToken ct)
+        => await DiscardPlanningSessionAsync(taskId, ct);
+    async Task IWorkerClient.FinalizePlanningSessionAsync(string taskId, bool queueAgentTasks, CancellationToken ct)
+        => await FinalizePlanningSessionAsync(taskId, queueAgentTasks, ct);
+
     // DTOs for deserializing hub responses
     private sealed class ActiveTaskDto
     {
diff --git a/src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs b/src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs
index 904a654..4111a86 100644
--- a/src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs
+++ b/src/ClaudeDo.Ui/ViewModels/Islands/TasksIslandViewModel.cs
@@ -13,7 +13,8 @@ namespace ClaudeDo.Ui.ViewModels.Islands;
 public sealed partial class TasksIslandViewModel : ViewModelBase
 {
     private readonly IDbContextFactory<ClaudeDoDbContext> _dbFactory;
-    private readonly WorkerClient? _worker;
+    private readonly IWorkerClient? _worker;
+    private readonly Dictionary<string, bool> _expandedState = new();
     private ListNavItemViewModel? _currentList;
     private CancellationTokenSource? _loadCts;
 
@@ -41,7 +42,7 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
     [ObservableProperty] private bool _showOpenLabel;
     [ObservableProperty] private string _completedHeader = "COMPLETED";
 
-    public TasksIslandViewModel(IDbContextFactory<ClaudeDoDbContext> dbFactory, WorkerClient? worker = null)
+    public TasksIslandViewModel(IDbContextFactory<ClaudeDoDbContext> dbFactory, IWorkerClient? worker = null)
     {
         _dbFactory = dbFactory;
         _worker = worker;
@@ -105,14 +106,35 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
         catch (OperationCanceledException) { }
     }
 
-    private void Regroup()
+    internal void Regroup()
     {
         OverdueItems.Clear();
         OpenItems.Clear();
         CompletedItems.Clear();
 
-        var today = DateTime.Today;
+        // Restore IsExpanded from saved state
         foreach (var r in Items)
+        {
+            if (_expandedState.TryGetValue(r.Id, out var saved))
+                r.IsExpanded = saved;
+        }
+
+        // Build hierarchy-aware flat list: top-level rows interleaved with visible children.
+        // Items is already ordered by SortOrder from the DB query.
+        var topLevel = Items.Where(r => !r.IsChild);
+        var flat = new List<TaskRowViewModel>();
+        foreach (var parent in topLevel)
+        {
+            flat.Add(parent);
+            if (parent.IsPlanningParent && parent.IsExpanded)
+            {
+                var children = Items.Where(r => r.ParentTaskId == parent.Id);
+                flat.AddRange(children);
+            }
+        }
+
+        var today = DateTime.Today;
+        foreach (var r in flat)
         {
             if (r.Done)
                 CompletedItems.Add(r);
@@ -356,6 +378,48 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
     [RelayCommand]
     private void OpenListSettings() => OpenListSettingsRequested?.Invoke(this, EventArgs.Empty);
 
+    [RelayCommand]
+    private async Task OpenPlanningSessionAsync(TaskRowViewModel? row)
+    {
+        if (row is null || row.Status != TaskStatus.Manual) return;
+        try { await _worker!.StartPlanningSessionAsync(row.Id); }
+        catch { }
+    }
+
+    [RelayCommand]
+    private async Task ResumePlanningSessionAsync(TaskRowViewModel? row)
+    {
+        if (row is null || !row.IsPlanningParent) return;
+        try { await _worker!.ResumePlanningSessionAsync(row.Id); }
+        catch { }
+    }
+
+    [RelayCommand]
+    private async Task DiscardPlanningSessionAsync(TaskRowViewModel? row)
+    {
+        if (row is null) return;
+        try { await _worker!.DiscardPlanningSessionAsync(row.Id); }
+        catch { }
+    }
+
+    [RelayCommand]
+    private async Task FinalizePlanningSessionAsync(TaskRowViewModel? row)
+    {
+        if (row is null) return;
+        try { await _worker!.FinalizePlanningSessionAsync(row.Id, queueAgentTasks: true); }
+        catch { }
+    }
+
+    [RelayCommand]
+    private void ToggleExpand(TaskRowViewModel? row)
+    {
+        if (row is null) return;
+        var next = !(_expandedState.TryGetValue(row.Id, out var current) ? current : row.IsExpanded);
+        _expandedState[row.Id] = next;
+        row.IsExpanded = next;
+        Regroup();
+    }
+
     partial void OnSelectedTaskChanged(TaskRowViewModel? value)
     {
         foreach (var i in Items) i.IsSelected = ReferenceEquals(i, value);
diff --git a/tests/ClaudeDo.Worker.Tests/UiVm/TasksIslandViewModelPlanningTests.cs b/tests/ClaudeDo.Worker.Tests/UiVm/TasksIslandViewModelPlanningTests.cs
new file mode 100644
index 0000000..ea9b67f
--- /dev/null
+++ b/tests/ClaudeDo.Worker.Tests/UiVm/TasksIslandViewModelPlanningTests.cs
@@ -0,0 +1,129 @@
+using ClaudeDo.Data;
+using ClaudeDo.Data.Models;
+using ClaudeDo.Ui.Services;
+using ClaudeDo.Ui.ViewModels.Islands;
+using CommunityToolkit.Mvvm.Input;
+using Microsoft.EntityFrameworkCore;
+using Xunit;
+using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
+
+namespace ClaudeDo.Worker.Tests.UiVm;
+
+// ── Fake worker client ────────────────────────────────────────────────────────
+
+sealed class FakeWorkerClient : IWorkerClient
+{
+    public int StartPlanningCalls { get; private set; }
+    public int ResumePlanningCalls { get; private set; }
+    public int DiscardPlanningCalls { get; private set; }
+    public int FinalizePlanningCalls { get; private set; }
+    public int WakeQueueCalls { get; private set; }
+
+    public Task WakeQueueAsync() { WakeQueueCalls++; return Task.CompletedTask; }
+    public Task StartPlanningSessionAsync(string taskId, CancellationToken ct = default) { StartPlanningCalls++; return Task.CompletedTask; }
+    public Task ResumePlanningSessionAsync(string taskId, CancellationToken ct = default) { ResumePlanningCalls++; return Task.CompletedTask; }
+    public Task DiscardPlanningSessionAsync(string taskId, CancellationToken ct = default) { DiscardPlanningCalls++; return Task.CompletedTask; }
+    public Task FinalizePlanningSessionAsync(string taskId, bool queueAgentTasks = true, CancellationToken ct = default) { FinalizePlanningCalls++; return Task.CompletedTask; }
+}
+
+// ── Helper to build VM with pre-seeded Items ──────────────────────────────────
+
+file static class VmFactory
+{
+    // Minimal SQLite :memory: factory — never actually called in these tests
+    // (we seed Items directly), but required by the VM constructor.
+    private static IDbContextFactory<ClaudeDoDbContext> NullDbFactory()
+    {
+        var opts = new DbContextOptionsBuilder<ClaudeDoDbContext>()
+            .UseSqlite("DataSource=:memory:")
+            .Options;
+        return new NullDbContextFactory(opts);
+    }
+
+    private sealed class NullDbContextFactory(DbContextOptions<ClaudeDoDbContext> opts)
+        : IDbContextFactory<ClaudeDoDbContext>
+    {
+        public ClaudeDoDbContext CreateDbContext() => new(opts);
+    }
+
+    public static (TasksIslandViewModel vm, FakeWorkerClient worker) Create(
+        IEnumerable<TaskRowViewModel> rows)
+    {
+        var worker = new FakeWorkerClient();
+        var vm = new TasksIslandViewModel(NullDbFactory(), worker);
+        foreach (var r in rows)
+            vm.Items.Add(r);
+        vm.Regroup();
+        return (vm, worker);
+    }
+}
+
+// ── Tests ─────────────────────────────────────────────────────────────────────
+
+public class TasksIslandViewModelPlanningTests
+{
+    private static TaskRowViewModel MakeRow(string id, TaskStatus status, string? parentId = null, int sortOrder = 0)
+        => new TaskRowViewModel { Id = id, Status = status, ParentTaskId = parentId };
+
+    [Fact]
+    public void ToggleExpand_CollapsesChildrenOfPlanningParent()
+    {
+        var parent = MakeRow("p1", TaskStatus.Planning);
+        var child1 = MakeRow("c1", TaskStatus.Draft, "p1");
+        var child2 = MakeRow("c2", TaskStatus.Draft, "p1");
+
+        var (vm, _) = VmFactory.Create([parent, child1, child2]);
+
+        // Initially expanded — children visible in OpenItems
+        Assert.Contains(child1, vm.OpenItems);
+        Assert.Contains(child2, vm.OpenItems);
+
+        // Collapse the parent
+        vm.ToggleExpandCommand.Execute(parent);
+
+        // Children should no longer appear
+        Assert.DoesNotContain(child1, vm.OpenItems);
+        Assert.DoesNotContain(child2, vm.OpenItems);
+        // Parent still present
+        Assert.Contains(parent, vm.OpenItems);
+    }
+
+    [Fact]
+    public async Task OpenPlanningSession_IgnoresNonManualRow()
+    {
+        var row = MakeRow("t1", TaskStatus.Queued);
+        var (vm, worker) = VmFactory.Create([row]);
+
+        await ((IAsyncRelayCommand<TaskRowViewModel?>)vm.OpenPlanningSessionCommand).ExecuteAsync(row);
+
+        Assert.Equal(0, worker.StartPlanningCalls);
+    }
+
+    [Fact]
+    public async Task OpenPlanningSession_CallsWorkerForManualRow()
+    {
+        var row = MakeRow("t1", TaskStatus.Manual);
+        var (vm, worker) = VmFactory.Create([row]);
+
+        await ((IAsyncRelayCommand<TaskRowViewModel?>)vm.OpenPlanningSessionCommand).ExecuteAsync(row);
+
+        Assert.Equal(1, worker.StartPlanningCalls);
+    }
+
+    [Fact]
+    public void ToggleExpand_ExpandsCollapsedParentAgain()
+    {
+        var parent = MakeRow("p1", TaskStatus.Planned);
+        var child = MakeRow("c1", TaskStatus.Draft, "p1");
+
+        var (vm, _) = VmFactory.Create([parent, child]);
+
+        // Collapse
+        vm.ToggleExpandCommand.Execute(parent);
+        Assert.DoesNotContain(child, vm.OpenItems);
+
+        // Re-expand
+        vm.ToggleExpandCommand.Execute(parent);
+        Assert.Contains(child, vm.OpenItems);
+    }
+}