diff --git a/src/ClaudeDo.Ui/ViewModels/Modals/UsageMonitorModalViewModel.cs b/src/ClaudeDo.Ui/ViewModels/Modals/UsageMonitorModalViewModel.cs
index 4f3a8414..0a9268fc 100644
--- a/src/ClaudeDo.Ui/ViewModels/Modals/UsageMonitorModalViewModel.cs
+++ b/src/ClaudeDo.Ui/ViewModels/Modals/UsageMonitorModalViewModel.cs
@@ -44,15 +44,57 @@ public sealed partial class UsageMonitorModalViewModel : ViewModelBase
 
     [ObservableProperty]
     [NotifyPropertyChangedFor(nameof(ModelsEmpty))]
+    [NotifyPropertyChangedFor(nameof(TotalsText))]
     private IReadOnlyList<ModelUsageDisplayRow> _modelRows = Array.Empty<ModelUsageDisplayRow>();
 
     [ObservableProperty]
     [NotifyPropertyChangedFor(nameof(TasksEmpty))]
     private IReadOnlyList<TaskUsageDisplayRow> _taskRows = Array.Empty<TaskUsageDisplayRow>();
 
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(TokenTrackerMissing))]
+    [NotifyPropertyChangedFor(nameof(ShowInstallButton))]
+    [NotifyPropertyChangedFor(nameof(NodeHintText))]
+    [NotifyPropertyChangedFor(nameof(TokenTrackerErrorText))]
+    [NotifyPropertyChangedFor(nameof(HasTokenTrackerError))]
+    [NotifyPropertyChangedFor(nameof(AnalyticsStampText))]
+    private TokenTrackerStatusDto? _tokenTracker;
+
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(TotalsText))]
+    private double _totalCostUsd;
+
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(ShowInstallButton))]
+    private bool _isInstalling;
+
     public bool ModelsEmpty => !IsBusy && ModelRows.Count == 0;
     public bool TasksEmpty => !IsBusy && TaskRows.Count == 0;
 
+    public bool TokenTrackerMissing => TokenTracker is { Installed: false };
+    public bool ShowInstallButton => TokenTracker is { Installed: false, NodeOk: true } && !IsInstalling;
+
+    public string NodeHintText => TokenTracker switch
+    {
+        { NodeOk: true } => "",
+        { NodeVersion: { Length: > 0 } v } => Loc.T("modals.usageMonitor.ttNodeHintFormat", v),
+        _ => Loc.T("modals.usageMonitor.ttNodeMissing"),
+    };
+
+    public bool HasTokenTrackerError => TokenTracker?.LastError is { Length: > 0 };
+    public string TokenTrackerErrorText => TokenTracker?.LastError is { Length: > 0 } e
+        ? Loc.T("modals.usageMonitor.ttErrorFormat", e)
+        : "";
+
+    public string AnalyticsStampText => TokenTracker?.LastFetchedUtc is { } t
+        ? Loc.T("modals.usageMonitor.analyticsStampFormat", t.ToLocalTime().ToString("HH:mm"))
+        : Loc.T("modals.usageMonitor.analyticsNever");
+
+    public string TotalsText => Loc.T(
+        "modals.usageMonitor.analyticsTotalsFormat",
+        ModelRows.Sum(r => r.GrandTotal).ToString("N0"),
+        TotalCostUsd.ToString("0.00"));
+
     [ObservableProperty]
     private IReadOnlyList<UsageGaugeRowViewModel> _gaugeRows = Array.Empty<UsageGaugeRowViewModel>();
 
@@ -154,6 +196,39 @@ public sealed partial class UsageMonitorModalViewModel : ViewModelBase
     [RelayCommand]
     private Task SetPreset30Days() => SetPreset(30);
 
+    [RelayCommand]
+    private async Task RefreshAnalytics()
+    {
+        try
+        {
+            TokenTracker = await _worker.RefreshTokenTrackerAsync();
+            await LoadUsageDataAsync();
+        }
+        catch (Exception ex)
+        {
+            ErrorReported?.Invoke(Loc.T("vm.usageMonitor.analyticsRefreshFailed", ex.Message));
+        }
+    }
+
+    // ErrorReported is the channel the shell hangs FlashFooterError on, so even the "install
+    // running" notice goes through it rather than getting its own banner.
+    [RelayCommand]
+    private async Task InstallTokenTracker()
+    {
+        IsInstalling = true;
+        ErrorReported?.Invoke(Loc.T("vm.usageMonitor.installStarted"));
+        try
+        {
+            TokenTracker = await _worker.InstallTokenTrackerAsync();
+            if (TokenTracker is { Installed: true }) await RefreshAnalytics();
+        }
+        catch (Exception ex)
+        {
+            ErrorReported?.Invoke(Loc.T("vm.usageMonitor.installFailed", ex.Message));
+        }
+        finally { IsInstalling = false; }
+    }
+
     private Task SetPreset(int days)
     {
         ApplyPresetRange(days);
@@ -183,10 +258,14 @@ public sealed partial class UsageMonitorModalViewModel : ViewModelBase
             var modelRows = await _worker.GetModelUsageAsync(from, to);
             var taskRows = await _worker.GetTaskUsageAsync(from, to);
             ModelRows = BuildModelDisplayRows(modelRows);
+            TotalCostUsd = modelRows.Sum(r => r.CostUsd ?? 0);
             TaskRows = taskRows
-                .Select(r => new TaskUsageDisplayRow(r.TaskId, r.TaskTitle, r.ListName, r.Model, r.Runs, r.TokensIn, r.TokensOut))
+                .Select(r => new TaskUsageDisplayRow(
+                    r.TaskId, r.TaskTitle, r.ListName, r.Model, r.Runs, r.TokensIn, r.TokensOut,
+                    r.CostUsd, r.Retries))
                 .OrderByDescending(r => r.TotalTokens)
                 .ToList();
+            TokenTracker = await _worker.GetTokenTrackerStatusAsync();
         }
         catch (Exception ex)
         {
@@ -303,9 +382,11 @@ public sealed partial class UsageMonitorModalViewModel : ViewModelBase
         foreach (var group in rows.GroupBy(r => r.Model))
         {
             long cdIn = 0, cdOut = 0, cdCache = 0, otIn = 0, otOut = 0, otCache = 0;
+            double cost = 0;
             foreach (var row in group)
             {
                 var cache = row.CacheReadTokens + row.CacheCreationTokens;
+                cost += row.CostUsd ?? 0;
                 if (string.Equals(row.Scope, "ClaudeDo", StringComparison.OrdinalIgnoreCase))
                 {
                     cdIn += row.InputTokens; cdOut += row.OutputTokens; cdCache += cache;
@@ -315,7 +396,7 @@ public sealed partial class UsageMonitorModalViewModel : ViewModelBase
                     otIn += row.InputTokens; otOut += row.OutputTokens; otCache += cache;
                 }
             }
-            built.Add(new ModelUsageDisplayRow(group.Key, cdIn, cdOut, cdCache, otIn, otOut, otCache));
+            built.Add(new ModelUsageDisplayRow(group.Key, cdIn, cdOut, cdCache, otIn, otOut, otCache, cost));
         }
 
         var grandTotal = built.Sum(r => r.GrandTotal);
@@ -496,12 +577,14 @@ public sealed record ModelUsageDisplayRow(
     long ClaudeDoCacheTokens,
     long OtherInputTokens,
     long OtherOutputTokens,
-    long OtherCacheTokens)
+    long OtherCacheTokens,
+    double CostUsd)
 {
     public double SharePercent { get; init; }
     public long ClaudeDoTotal => ClaudeDoInputTokens + ClaudeDoOutputTokens + ClaudeDoCacheTokens;
     public long OtherTotal => OtherInputTokens + OtherOutputTokens + OtherCacheTokens;
     public long GrandTotal => ClaudeDoTotal + OtherTotal;
+    public string CostText => CostUsd > 0 ? CostUsd.ToString("0.00") : "—";
 }
 
 public sealed record TaskUsageDisplayRow(
@@ -511,7 +594,11 @@ public sealed record TaskUsageDisplayRow(
     string? Model,
     int Runs,
     long TokensIn,
-    long TokensOut)
+    long TokensOut,
+    double? CostUsd,
+    int? Retries)
 {
     public long TotalTokens => TokensIn + TokensOut;
+    public string CostText => CostUsd is > 0 ? CostUsd.Value.ToString("0.00") : "—";
+    public string RetriesText => Retries?.ToString() ?? "—";
 }