diff --git a/src/ClaudeDo.Ui/Converters/WorkerLogLevelToBrushConverter.cs b/src/ClaudeDo.Ui/Converters/WorkerLogLevelToBrushConverter.cs
new file mode 100644
index 0000000..85a3158
--- /dev/null
+++ b/src/ClaudeDo.Ui/Converters/WorkerLogLevelToBrushConverter.cs
@@ -0,0 +1,45 @@
+using System;
+using System.Globalization;
+using Avalonia;
+using Avalonia.Data.Converters;
+using Avalonia.Media;
+using ClaudeDo.Data.Models;
+
+namespace ClaudeDo.Ui.Converters;
+
+public sealed class WorkerLogLevelToBrushConverter : IValueConverter
+{
+    private static readonly IBrush SuccessBrush = new SolidColorBrush(Color.Parse("#4CAF50"));
+    private static readonly IBrush WarnBrush    = new SolidColorBrush(Color.Parse("#FFA726"));
+    private static readonly IBrush ErrorBrush   = new SolidColorBrush(Color.Parse("#EF5350"));
+    private static readonly IBrush InfoFallback = new SolidColorBrush(Color.Parse("#888888"));
+
+    public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
+    {
+        if (value is not WorkerLogLevel level)
+            return AvaloniaProperty.UnsetValue;
+
+        return level switch
+        {
+            WorkerLogLevel.Success => SuccessBrush,
+            WorkerLogLevel.Warn    => WarnBrush,
+            WorkerLogLevel.Error   => ErrorBrush,
+            WorkerLogLevel.Info    => ResolveInfoBrush(),
+            _                      => AvaloniaProperty.UnsetValue,
+        };
+    }
+
+    public object? ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture) =>
+        throw new NotSupportedException();
+
+    private static IBrush ResolveInfoBrush()
+    {
+        if (Application.Current is { } app &&
+            app.Resources.TryGetResource("TextDimBrush", app.ActualThemeVariant, out var res) &&
+            res is IBrush brush)
+        {
+            return brush;
+        }
+        return InfoFallback;
+    }
+}
diff --git a/tests/ClaudeDo.Ui.Tests/ClaudeDo.Ui.Tests.csproj b/tests/ClaudeDo.Ui.Tests/ClaudeDo.Ui.Tests.csproj
index ac032c8..e8fd759 100644
--- a/tests/ClaudeDo.Ui.Tests/ClaudeDo.Ui.Tests.csproj
+++ b/tests/ClaudeDo.Ui.Tests/ClaudeDo.Ui.Tests.csproj
@@ -10,6 +10,8 @@
     <Using Include="Xunit" />
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="Avalonia" Version="12.0.0" />
+    <PackageReference Include="Avalonia.Headless" Version="12.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.0.1" />
diff --git a/tests/ClaudeDo.Ui.Tests/WorkerLogLevelToBrushConverterTests.cs b/tests/ClaudeDo.Ui.Tests/WorkerLogLevelToBrushConverterTests.cs
new file mode 100644
index 0000000..303e634
--- /dev/null
+++ b/tests/ClaudeDo.Ui.Tests/WorkerLogLevelToBrushConverterTests.cs
@@ -0,0 +1,45 @@
+using System.Globalization;
+using Avalonia;
+using Avalonia.Media;
+using ClaudeDo.Data.Models;
+using ClaudeDo.Ui.Converters;
+using Xunit;
+
+namespace ClaudeDo.Ui.Tests;
+
+public class WorkerLogLevelToBrushConverterTests
+{
+    [Theory]
+    [InlineData(WorkerLogLevel.Success, "#FF4CAF50")]
+    [InlineData(WorkerLogLevel.Warn,    "#FFFFA726")]
+    [InlineData(WorkerLogLevel.Error,   "#FFEF5350")]
+    public void Convert_maps_level_to_expected_brush_color(WorkerLogLevel level, string expectedArgb)
+    {
+        var converter = new WorkerLogLevelToBrushConverter();
+
+        var result = converter.Convert(level, typeof(IBrush), null, CultureInfo.InvariantCulture);
+
+        var solid = Assert.IsType<SolidColorBrush>(result);
+        Assert.Equal(expectedArgb.ToLowerInvariant(), $"#{solid.Color.ToUInt32():X8}".ToLowerInvariant());
+    }
+
+    [Fact]
+    public void Convert_info_returns_a_brush_fallback_when_no_app()
+    {
+        var converter = new WorkerLogLevelToBrushConverter();
+
+        var result = converter.Convert(WorkerLogLevel.Info, typeof(IBrush), null, CultureInfo.InvariantCulture);
+
+        Assert.IsAssignableFrom<IBrush>(result);
+    }
+
+    [Fact]
+    public void Convert_unknown_value_returns_unset()
+    {
+        var converter = new WorkerLogLevelToBrushConverter();
+
+        var result = converter.Convert("not a level", typeof(IBrush), null, CultureInfo.InvariantCulture);
+
+        Assert.Equal(AvaloniaProperty.UnsetValue, result);
+    }
+}