diff --git a/src/ClaudeDo.Ui/ViewModels/MissionControlViewModel.cs b/src/ClaudeDo.Ui/ViewModels/MissionControlViewModel.cs
index 0c4d324e..cc7d4dfc 100644
--- a/src/ClaudeDo.Ui/ViewModels/MissionControlViewModel.cs
+++ b/src/ClaudeDo.Ui/ViewModels/MissionControlViewModel.cs
@@ -158,22 +158,26 @@ public sealed partial class MissionControlViewModel : ViewModelBase, IDisposable
         {
             var snapshot = await _worker.GetActiveOperationsAsync();
             RunningOperations.Clear();
-            foreach (var op in snapshot.OrderBy(o => o.StartedAt))
+            foreach (var op in snapshot.Where(o => !_endedOperationIds.Contains(o.Id)).OrderBy(o => o.StartedAt))
                 RunningOperations.Add(new RunningOperationViewModel(op));
             NotifyOperationsChanged();
         }
         catch (Exception ex) { ErrorReported?.Invoke(Loc.T("missionControl.operationsRefreshFailed", ex.Message)); }
     }
 
+    /// <summary>Ids already reported ended; guards against a late Started or a stale snapshot re-adding them. Op ids are unique, so it is never pruned (a few bytes per op).</summary>
+    private readonly HashSet<string> _endedOperationIds = new();
+
     private void AddOperation(RunningOperationDto op)
     {
-        if (RunningOperations.Any(r => r.Id == op.Id)) return;
+        if (_endedOperationIds.Contains(op.Id) || RunningOperations.Any(r => r.Id == op.Id)) return;
         RunningOperations.Add(new RunningOperationViewModel(op));
         NotifyOperationsChanged();
     }
 
     private void RemoveOperation(string id)
     {
+        _endedOperationIds.Add(id);
         var row = RunningOperations.FirstOrDefault(r => r.Id == id);
         if (row is null) return;
         RunningOperations.Remove(row);
diff --git a/tests/ClaudeDo.Ui.Tests/ViewModels/MissionControlRunningOperationsTests.cs b/tests/ClaudeDo.Ui.Tests/ViewModels/MissionControlRunningOperationsTests.cs
index cc82b408..e1304b25 100644
--- a/tests/ClaudeDo.Ui.Tests/ViewModels/MissionControlRunningOperationsTests.cs
+++ b/tests/ClaudeDo.Ui.Tests/ViewModels/MissionControlRunningOperationsTests.cs
@@ -28,7 +28,13 @@ public class MissionControlRunningOperationsTests : IDisposable
     private sealed class FakeWorker : StubWorkerClient
     {
         public IReadOnlyList<RunningOperationDto> Snapshot { get; set; } = Array.Empty<RunningOperationDto>();
-        public override Task<IReadOnlyList<RunningOperationDto>> GetActiveOperationsAsync() => Task.FromResult(Snapshot);
+        /// <summary>When set, the snapshot call completes only once this source is resolved.</summary>
+        public TaskCompletionSource? Gate { get; set; }
+        public override async Task<IReadOnlyList<RunningOperationDto>> GetActiveOperationsAsync()
+        {
+            if (Gate is not null) await Gate.Task;
+            return Snapshot;
+        }
     }
 
     private static RunningOperationDto Op(string id, string kind, int? number, string title, string? listId = null) =>
@@ -78,6 +84,35 @@ public class MissionControlRunningOperationsTests : IDisposable
         Assert.False(vm.HasRunningOperations);
     }
 
+    [Fact]
+    public async Task EndedDuringPendingSnapshot_DoesNotReappear()
+    {
+        var gate = new TaskCompletionSource();
+        var worker = new FakeWorker { Snapshot = new[] { Op("a", OperationKinds.Merging, 1, "Task") }, Gate = gate };
+        var vm = BuildVm(worker);
+
+        var refresh = vm.RefreshOperationsAsync();
+        worker.RaiseOperationEnded("a");
+        gate.SetResult();
+        await refresh;
+
+        Assert.Empty(vm.RunningOperations);
+        Assert.False(vm.HasRunningOperations);
+    }
+
+    [Fact]
+    public async Task EndedBeforeStarted_LeavesNoRow()
+    {
+        var worker = new FakeWorker();
+        var vm = BuildVm(worker);
+        await vm.RefreshOperationsAsync();
+
+        worker.RaiseOperationEnded("a");
+        worker.RaiseOperationStarted(Op("a", OperationKinds.Merging, 1, "Task"));
+
+        Assert.Empty(vm.RunningOperations);
+    }
+
     [Fact]
     public async Task ConnectionRestored_ReplacesListWithFreshSnapshot()
     {