diff --git a/Craftimizer/Plugin/SimulatorWindow.cs b/Craftimizer/Plugin/SimulatorWindow.cs
index ca01059..79d5575 100644
--- a/Craftimizer/Plugin/SimulatorWindow.cs
+++ b/Craftimizer/Plugin/SimulatorWindow.cs
@@ -49,6 +49,8 @@ public class SimulatorWindow : Window
         ImGui.EndChild();
         ImGui.TableNextColumn();
         ImGui.BeginChild("CraftimizerSimulator", Vector2.Zero, true, ImGuiWindowFlags.NoDecoration);
+        ImGui.Text($"Step {Simulation.StepCount + 1}");
+        ImGui.Text($"{Simulation.HQPercent}%% HQ");
         ImGui.PushStyleColor(ImGuiCol.PlotHistogram, new Vector4(.2f, 1f, .2f, 1f));
         ImGui.ProgressBar(Math.Min((float)Simulation.Progress / Simulation.MaxProgress, 1f), new Vector2(200, 20), $"{Simulation.Progress} / {Simulation.MaxProgress}");
         ImGui.PopStyleColor();
@@ -61,7 +63,6 @@ public class SimulatorWindow : Window
         ImGui.PushStyleColor(ImGuiCol.PlotHistogram, new Vector4(1f, .2f, 1f, 1f));
         ImGui.ProgressBar(Math.Clamp((float)Simulation.CP / Simulation.Stats.CP, 0f, 1f), new Vector2(200, 20), $"{Simulation.CP} / {Simulation.Stats.CP}");
         ImGui.PopStyleColor();
-        ImGui.Text($"{Simulation.HQPercent}%% HQ");
         ImGuiHelpers.ScaledDummy(5);
         ImGui.Text($"Effects:");
         foreach (var (effect, strength, stepsLeft) in Simulation.ActiveEffects)
diff --git a/Craftimizer/Simulator/ActionResponse.cs b/Craftimizer/Simulator/ActionResponse.cs
new file mode 100644
index 0000000..d71d4b2
--- /dev/null
+++ b/Craftimizer/Simulator/ActionResponse.cs
@@ -0,0 +1,14 @@
+namespace Craftimizer.Simulator;
+
+public enum ActionResponse
+{
+    SimulationComplete,
+    ActionNotUnlocked,
+    NotEnoughCP,
+    NoDurability,
+    CannotUseAction,
+
+    UsedAction,
+    ProgressComplete,
+    NoMoreDurability,
+}
diff --git a/Craftimizer/Simulator/CompletionReason.cs b/Craftimizer/Simulator/CompletionReason.cs
deleted file mode 100644
index 8a79f7c..0000000
--- a/Craftimizer/Simulator/CompletionReason.cs
+++ /dev/null
@@ -1,7 +0,0 @@
-namespace Craftimizer.Simulator;
-
-public enum CompletionReason
-{
-    ProgressComplete,
-    NoMoreDurability
-}
diff --git a/Craftimizer/Simulator/Simulation.cs b/Craftimizer/Simulator/Simulation.cs
index 8473406..c342a90 100644
--- a/Craftimizer/Simulator/Simulation.cs
+++ b/Craftimizer/Simulator/Simulation.cs
@@ -17,6 +17,7 @@ public class Simulation
     public int MaxQuality => (int)RecipeTable.Quality * Recipe.QualityFactor / 100;
     public int MaxProgress => RecipeTable.Difficulty * Recipe.DifficultyFactor / 100;
 
+    public bool IsComplete { get; private set; }
     public int StepCount { get; private set; }
     public int Progress { get; private set; }
     public int Quality { get; private set; }
@@ -26,6 +27,7 @@ public class Simulation
     public List<(Effect effect, int strength, int stepsLeft)> ActiveEffects { get; } = new();
     public List<BaseAction> ActionHistory { get; } = new();
 
+    // https://github.com/ffxiv-teamcraft/simulator/blob/0682dfa76043ff4ccb38832c184d046ceaff0733/src/model/tables.ts#L2
     private static readonly int[] HQPercentTable = {
         1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8,
         9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, 14, 15, 15, 15, 16, 16, 17, 17,
@@ -42,6 +44,7 @@ public class Simulation
     {
         Stats = stats;
         Recipe = recipe;
+        IsComplete = false;
         StepCount = 0;
         Progress = 0;
         Quality = 0;
@@ -50,10 +53,19 @@ public class Simulation
         Condition = Condition.Normal;
     }
 
-    public CompletionReason? Execute(BaseAction action)
+    public ActionResponse Execute(BaseAction action)
     {
+        if (IsComplete)
+            return ActionResponse.SimulationComplete;
+
         if (!action.CanUse)
-            return null;
+        {
+            if (action.Level > Stats.Level)
+                return ActionResponse.ActionNotUnlocked;
+            if (action.CPCost > CP)
+                return ActionResponse.NotEnoughCP;
+            return ActionResponse.CannotUseAction;
+        }
 
         action.Use();
         ActionHistory.Add(action);
@@ -71,14 +83,20 @@ public class Simulation
         }
 
         if (Progress >= MaxProgress)
-            return CompletionReason.ProgressComplete;
+        {
+            IsComplete = true;
+            return ActionResponse.ProgressComplete;
+        }
         if (Durability <= 0)
-            return CompletionReason.NoMoreDurability;
+        {
+            IsComplete = true;
+            return ActionResponse.NoMoreDurability;
+        }
 
-        return null;
+        return ActionResponse.UsedAction;
     }
 
-    public CompletionReason? Execute<T>() where T : BaseAction =>
+    public ActionResponse Execute<T>() where T : BaseAction =>
         Execute((T)Activator.CreateInstance(typeof(T), this)!);
 
     public (int Strength, int Duration)? GetEffect(Effect effect)