diff --git a/src/Everything2Everything.App/App.xaml.cs b/src/Everything2Everything.App/App.xaml.cs
index 44b3cba..83bb4e0 100644
--- a/src/Everything2Everything.App/App.xaml.cs
+++ b/src/Everything2Everything.App/App.xaml.cs
@@ -76,15 +76,27 @@ public partial class App : Application
 
     private void ShowMainWindow()
     {
-        var window = new MainWindow(Engine, Settings);
+        RunFirstRunSetupIfNeeded();
+        var adService = _services.GetService<Everything2Everything.Core.Ads.IAdService>();
+        var window = new MainWindow(Engine, Settings, null, adService);
         MainWindow = window;
         window.Show();
         window.Activate();
     }
 
+    /// <summary>첫 실행이면 외부 도구 설치 마법사를 한 번 띄우고 완료 플래그를 남긴다(설정 창에서 재진입 가능).</summary>
+    private void RunFirstRunSetupIfNeeded()
+    {
+        if (Settings.Get("setup.tools.done") == "1") return;
+        var wizard = new ToolSetupWindow();
+        wizard.ShowDialog();
+        Settings.Set("setup.tools.done", "1");
+    }
+
     private void ShowConvertDialog(IReadOnlyList<string> files)
     {
-        var window = new Views.MainWindow(Engine, Settings, files);
+        var adService = _services.GetService<Everything2Everything.Core.Ads.IAdService>();
+        var window = new Views.MainWindow(Engine, Settings, files, adService);
         MainWindow = window;
         window.Show();
         window.Activate();
diff --git a/src/Everything2Everything.App/ViewModels/AdViewModel.cs b/src/Everything2Everything.App/ViewModels/AdViewModel.cs
new file mode 100644
index 0000000..b5f1b9c
--- /dev/null
+++ b/src/Everything2Everything.App/ViewModels/AdViewModel.cs
@@ -0,0 +1,106 @@
+using System;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Windows.Input;
+using Everything2Everything.Core.Ads;
+
+namespace Everything2Everything.App.ViewModels;
+
+public class AdViewModel : INotifyPropertyChanged
+{
+    private readonly IAdService _adService;
+    private AdItem? _currentBannerAd;
+    private AdItem? _currentLargeAd;
+    private bool _isBannerVisible = true;
+    private bool _isLargeCardVisible = true;
+
+    public event PropertyChangedEventHandler? PropertyChanged;
+
+    public AdItem? CurrentBannerAd
+    {
+        get => _currentBannerAd;
+        set { _currentBannerAd = value; OnPropertyChanged(); }
+    }
+
+    public AdItem? CurrentLargeAd
+    {
+        get => _currentLargeAd;
+        set { _currentLargeAd = value; OnPropertyChanged(); }
+    }
+
+    public bool IsBannerVisible
+    {
+        get => _isBannerVisible;
+        set { _isBannerVisible = value; OnPropertyChanged(); }
+    }
+
+    public bool IsLargeCardVisible
+    {
+        get => _isLargeCardVisible;
+        set { _isLargeCardVisible = value; OnPropertyChanged(); }
+    }
+
+    public ICommand ClickBannerAdCommand { get; }
+    public ICommand ClickLargeAdCommand { get; }
+    public ICommand DismissBannerCommand { get; }
+    public ICommand DismissLargeCardCommand { get; }
+
+    public AdViewModel(IAdService adService)
+    {
+        _adService = adService ?? throw new ArgumentNullException(nameof(adService));
+
+        CurrentBannerAd = _adService.GetNextBannerAd();
+        CurrentLargeAd = _adService.GetNextLargeCardAd();
+
+        ClickBannerAdCommand = new AdCommand(_ =>
+        {
+            if (CurrentBannerAd != null)
+                _adService.OpenAdUrl(CurrentBannerAd);
+        });
+
+        ClickLargeAdCommand = new AdCommand(_ =>
+        {
+            if (CurrentLargeAd != null)
+                _adService.OpenAdUrl(CurrentLargeAd);
+        });
+
+        DismissBannerCommand = new AdCommand(_ => IsBannerVisible = false);
+        DismissLargeCardCommand = new AdCommand(_ => IsLargeCardVisible = false);
+    }
+
+    public void RotateBannerAd()
+    {
+        CurrentBannerAd = _adService.GetNextBannerAd();
+    }
+
+    public void RotateLargeCardAd()
+    {
+        CurrentLargeAd = _adService.GetNextLargeCardAd();
+    }
+
+    protected void OnPropertyChanged([CallerMemberName] string? propertyName = null)
+    {
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+    }
+
+    private sealed class AdCommand : ICommand
+    {
+        private readonly Action<object?> _execute;
+        private readonly Func<object?, bool>? _canExecute;
+
+        public AdCommand(Action<object?> execute, Func<object?, bool>? canExecute = null)
+        {
+            _execute = execute;
+            _canExecute = canExecute;
+        }
+
+        public bool CanExecute(object? parameter) => _canExecute?.Invoke(parameter) ?? true;
+        public void Execute(object? parameter) => _execute(parameter);
+
+        public event EventHandler? CanExecuteChanged
+        {
+            add { }
+            remove { }
+        }
+    }
+}
diff --git a/src/Everything2Everything.App/ViewModels/ToolSetupViewModel.cs b/src/Everything2Everything.App/ViewModels/ToolSetupViewModel.cs
new file mode 100644
index 0000000..4f2ce7f
--- /dev/null
+++ b/src/Everything2Everything.App/ViewModels/ToolSetupViewModel.cs
@@ -0,0 +1,184 @@
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Windows;
+using System.Windows.Media;
+using Everything2Everything.Core.Converters;
+
+namespace Everything2Everything.App.ViewModels;
+
+public enum ToolInstallState
+{
+    NotInstalled,
+    Installed,
+    Busy,
+    Failed,
+}
+
+/// <summary>설치 마법사 목록의 한 행. 카탈로그 정의 + 선택/상태/진행 표현.</summary>
+public sealed class ToolInstallItem : INotifyPropertyChanged
+{
+    public ExternalToolDefinition Definition { get; }
+    public ToolInstallItem(ExternalToolDefinition definition)
+    {
+        Definition = definition;
+        RefreshStatus();
+    }
+
+    public string Name => Definition.DisplayName;
+    public string Description => Definition.Description;
+
+    private bool _isSelected = true;
+    public bool IsSelected
+    {
+        get => _isSelected;
+        set { _isSelected = value; OnPropertyChanged(); }
+    }
+
+    private ToolInstallState _state;
+    public ToolInstallState State
+    {
+        get => _state;
+        private set
+        {
+            _state = value;
+            OnPropertyChanged();
+            OnPropertyChanged(nameof(IsBusy));
+            OnPropertyChanged(nameof(StatusText));
+            OnPropertyChanged(nameof(StatusBrush));
+        }
+    }
+
+    public string StatusText => State switch
+    {
+        ToolInstallState.Installed => "설치됨",
+        ToolInstallState.Busy => "설치 중…",
+        ToolInstallState.Failed => "실패",
+        _ => "미설치",
+    };
+
+    public bool IsBusy => State == ToolInstallState.Busy;
+
+    public Brush StatusBrush => State switch
+    {
+        ToolInstallState.Installed => BrushOf("FsStatusSuccess"),
+        ToolInstallState.Busy => BrushOf("FsStatusInfo"),
+        ToolInstallState.Failed => BrushOf("FsStatusDanger"),
+        _ => BrushOf("FsStatusWarn"),
+    };
+
+    private string? _detail;
+    public string? Detail
+    {
+        get => _detail;
+        private set { _detail = value; OnPropertyChanged(); }
+    }
+
+    public void RefreshStatus()
+        => State = Definition.IsInstalled() ? ToolInstallState.Installed : ToolInstallState.NotInstalled;
+
+    public void ApplyResult(bool success, string? detail)
+    {
+        Detail = detail;
+        State = success ? ToolInstallState.Installed : ToolInstallState.Failed;
+    }
+
+    public void BeginInstall() => State = ToolInstallState.Busy;
+
+    private static Brush BrushOf(string key)
+        => (Application.Current?.TryFindResource(key) as Brush)
+           ?? _fallbacks.GetValueOrDefault(key, _warn);
+
+    private static readonly Brush _info = Fixed(0x1565C0);
+    private static readonly Brush _success = Fixed(0x2E7D32);
+    private static readonly Brush _warn = Fixed(0xC77700);
+    private static readonly Brush _danger = Fixed(0xC62828);
+    private static readonly Dictionary<string, Brush> _fallbacks = new()
+    {
+        ["FsStatusInfo"] = _info,
+        ["FsStatusSuccess"] = _success,
+        ["FsStatusWarn"] = _warn,
+        ["FsStatusDanger"] = _danger,
+    };
+
+    private static Brush Fixed(uint rgb)
+    {
+        var c = (int)rgb;
+        return new SolidColorBrush(Color.FromRgb((byte)(c >> 16), (byte)(c >> 8), (byte)c));
+    }
+
+    public event PropertyChangedEventHandler? PropertyChanged;
+    private void OnPropertyChanged([CallerMemberName] string? name = null)
+        => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
+}
+
+/// <summary>설치 마법사의 루트 뷰모델: 목록 + 전체 선택 + 선택분 순차 설치.</summary>
+public sealed class ToolSetupViewModel : INotifyPropertyChanged
+{
+    private readonly ExternalToolInstaller _installer;
+    private bool _isInstalling;
+    private bool _selectAll = true;
+
+    public ObservableCollection<ToolInstallItem> Tools { get; } = new();
+
+    public ToolSetupViewModel(IEnumerable<ExternalToolDefinition>? definitions = null, ExternalToolInstaller? installer = null)
+    {
+        _installer = installer ?? new ExternalToolInstaller();
+        foreach (var def in definitions ?? ExternalToolCatalog.All)
+            Tools.Add(new ToolInstallItem(def));
+    }
+
+    public bool IsInstalling
+    {
+        get => _isInstalling;
+        private set { _isInstalling = value; OnPropertyChanged(); }
+    }
+
+    public bool SelectAll
+    {
+        get => _selectAll;
+        set
+        {
+            _selectAll = value;
+            foreach (var t in Tools) t.IsSelected = value;
+            OnPropertyChanged();
+        }
+    }
+
+    public void RefreshStatus()
+    {
+        foreach (var t in Tools) t.RefreshStatus();
+    }
+
+    public async Task InstallSelectedAsync(CancellationToken ct)
+    {
+        if (IsInstalling) return;
+        IsInstalling = true;
+        try
+        {
+            foreach (var item in Tools.Where(t => t.IsSelected).ToList())
+                await InstallOneAsync(item, ct).ConfigureAwait(true);
+        }
+        finally
+        {
+            IsInstalling = false;
+        }
+    }
+
+    public async Task InstallOneAsync(ToolInstallItem item, CancellationToken ct)
+    {
+        item.BeginInstall();
+        var result = await _installer.InstallAsync(item.Definition, ct).ConfigureAwait(true);
+        var detail = string.IsNullOrWhiteSpace(result.Output)
+            ? result.Message
+            : Tail(result.Output, 600);
+        item.ApplyResult(result.Success, detail);
+    }
+
+    private static string Tail(string s, int max)
+        => s.Length <= max ? s : "…" + s[^max..];
+
+    public event PropertyChangedEventHandler? PropertyChanged;
+    private void OnPropertyChanged([CallerMemberName] string? name = null)
+        => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
+}
diff --git a/src/Everything2Everything.App/Views/AdBannerControl.xaml b/src/Everything2Everything.App/Views/AdBannerControl.xaml
new file mode 100644
index 0000000..19d5b9c
--- /dev/null
+++ b/src/Everything2Everything.App/Views/AdBannerControl.xaml
@@ -0,0 +1,99 @@
+<UserControl x:Class="Everything2Everything.App.Views.AdBannerControl"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d"
+             d:DesignHeight="56" d:DesignWidth="800">
+    <UserControl.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="FormatShiftTheme.xaml"/>
+            </ResourceDictionary.MergedDictionaries>
+            <BooleanToVisibilityConverter x:Key="BoolToVis"/>
+        </ResourceDictionary>
+    </UserControl.Resources>
+
+    <Border Visibility="{Binding IsBannerVisible, Converter={StaticResource BoolToVis}}"
+            Style="{StaticResource FsDoubleBezelShellStyle}"
+            Margin="0,4,0,0">
+        <Border Style="{StaticResource FsDoubleBezelCoreStyle}" Padding="12,8">
+            <Grid VerticalAlignment="Center">
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="Auto"/>
+                    <ColumnDefinition Width="*"/>
+                    <ColumnDefinition Width="Auto"/>
+                    <ColumnDefinition Width="Auto"/>
+                </Grid.ColumnDefinitions>
+
+                <!-- 1. [AD] / [스폰서] 배지 -->
+                <Border Grid.Column="0"
+                        Margin="0,0,10,0"
+                        Padding="6,2"
+                        CornerRadius="4"
+                        Background="#1A00E5FF"
+                        BorderBrush="{StaticResource FsAccentCyan}"
+                        BorderThickness="1"
+                        VerticalAlignment="Center">
+                    <TextBlock Text="{Binding CurrentBannerAd.BadgeText, FallbackValue=AD}"
+                               FontSize="10"
+                               FontWeight="Bold"
+                               Foreground="{StaticResource FsAccentCyan}"
+                               VerticalAlignment="Center"
+                               TextTrimming="CharacterEllipsis"/>
+                </Border>
+
+                <!-- 2. 광고 타이틀 및 설명 -->
+                <StackPanel Grid.Column="1" VerticalAlignment="Center" Margin="0,0,12,0">
+                    <TextBlock Text="{Binding CurrentBannerAd.Title, FallbackValue=스폰서십 안내}"
+                               Style="{StaticResource FsLabelStyle}"
+                               Foreground="{StaticResource FsTextPrimary}"
+                               FontWeight="SemiBold"
+                               TextTrimming="CharacterEllipsis"
+                               VerticalAlignment="Center"/>
+                    <TextBlock Text="{Binding CurrentBannerAd.Description, FallbackValue=Everything2Everything을 후원하고 최신 기능을 가장 먼저 만나보세요.}"
+                               Style="{StaticResource FsCaptionStyle}"
+                               Foreground="{StaticResource FsTextSecondary}"
+                               Margin="0,2,0,0"
+                               TextTrimming="CharacterEllipsis"
+                               VerticalAlignment="Center"/>
+                </StackPanel>
+
+                <!-- 3. CTA 액션 버튼 -->
+                <Button Grid.Column="2"
+                        Margin="0,0,8,0"
+                        Padding="12,4"
+                        Height="28"
+                        VerticalAlignment="Center"
+                        Style="{StaticResource FsSecondaryButtonStyle}"
+                        Command="{Binding ClickBannerAdCommand}"
+                        ToolTip="광고 및 안내 링크 열기">
+                    <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
+                        <TextBlock Text="{Binding CurrentBannerAd.CtaText, FallbackValue='자세히 보기'}"
+                                   FontSize="11"
+                                   VerticalAlignment="Center"
+                                   TextTrimming="CharacterEllipsis"/>
+                        <ui:SymbolIcon Symbol="Open24"
+                                       FontSize="11"
+                                       Margin="4,0,0,0"
+                                       VerticalAlignment="Center"/>
+                    </StackPanel>
+                </Button>
+
+                <!-- 4. 광고 닫기 버튼 -->
+                <Button Grid.Column="3"
+                        Width="24" Height="24"
+                        VerticalAlignment="Center"
+                        Style="{StaticResource FsIconButtonStyle}"
+                        Command="{Binding DismissBannerCommand}"
+                        ToolTip="광고 닫기">
+                    <ui:SymbolIcon Symbol="Dismiss24"
+                                   FontSize="11"
+                                   Foreground="{StaticResource FsTextTertiary}"
+                                   VerticalAlignment="Center"/>
+                </Button>
+            </Grid>
+        </Border>
+    </Border>
+</UserControl>
diff --git a/src/Everything2Everything.App/Views/AdBannerControl.xaml.cs b/src/Everything2Everything.App/Views/AdBannerControl.xaml.cs
new file mode 100644
index 0000000..8791a0f
--- /dev/null
+++ b/src/Everything2Everything.App/Views/AdBannerControl.xaml.cs
@@ -0,0 +1,11 @@
+using System.Windows.Controls;
+
+namespace Everything2Everything.App.Views;
+
+public partial class AdBannerControl : UserControl
+{
+    public AdBannerControl()
+    {
+        InitializeComponent();
+    }
+}
diff --git a/src/Everything2Everything.App/Views/AdLargeCardControl.xaml b/src/Everything2Everything.App/Views/AdLargeCardControl.xaml
new file mode 100644
index 0000000..63fce7e
--- /dev/null
+++ b/src/Everything2Everything.App/Views/AdLargeCardControl.xaml
@@ -0,0 +1,117 @@
+<UserControl x:Class="Everything2Everything.App.Views.AdLargeCardControl"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d"
+             d:DesignHeight="220" d:DesignWidth="320">
+    <UserControl.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="FormatShiftTheme.xaml"/>
+            </ResourceDictionary.MergedDictionaries>
+            <BooleanToVisibilityConverter x:Key="BoolToVis"/>
+        </ResourceDictionary>
+    </UserControl.Resources>
+
+    <Border Visibility="{Binding IsLargeCardVisible, Converter={StaticResource BoolToVis}}"
+            Style="{StaticResource FsDoubleBezelShellStyle}"
+            Margin="0,16,0,0">
+        <Border Style="{StaticResource FsDoubleBezelCoreStyle}" Padding="16">
+            <StackPanel>
+                <!-- 1. 헤더: 스폰서 배지 + 닫기 버튼 -->
+                <Grid Margin="0,0,0,12">
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="*"/>
+                        <ColumnDefinition Width="Auto"/>
+                    </Grid.ColumnDefinitions>
+                    <StackPanel Grid.Column="0" Orientation="Horizontal" VerticalAlignment="Center">
+                        <Border Padding="6,2"
+                                CornerRadius="4"
+                                Background="#1A3B82F6"
+                                BorderBrush="{StaticResource FsAccentBlue}"
+                                BorderThickness="1"
+                                VerticalAlignment="Center">
+                            <TextBlock Text="{Binding CurrentLargeAd.BadgeText, FallbackValue='스폰서 추천'}"
+                                       FontSize="10"
+                                       FontWeight="Bold"
+                                       Foreground="{StaticResource FsAccentBlue}"
+                                       VerticalAlignment="Center"
+                                       TextTrimming="CharacterEllipsis"/>
+                        </Border>
+                    </StackPanel>
+
+                    <Button Grid.Column="1"
+                            Width="22" Height="22"
+                            VerticalAlignment="Center"
+                            Style="{StaticResource FsIconButtonStyle}"
+                            Command="{Binding DismissLargeCardCommand}"
+                            ToolTip="광고 닫기">
+                        <ui:SymbolIcon Symbol="Dismiss24"
+                                       FontSize="10"
+                                       Foreground="{StaticResource FsTextTertiary}"
+                                       VerticalAlignment="Center"/>
+                    </Button>
+                </Grid>
+
+                <!-- 2. 본문: 아이콘/이미지 + 타이틀 + 설명 -->
+                <Grid Margin="0,0,0,12">
+                    <Grid.ColumnDefinitions>
+                        <ColumnDefinition Width="Auto"/>
+                        <ColumnDefinition Width="*"/>
+                    </Grid.ColumnDefinitions>
+
+                    <Border Grid.Column="0"
+                            Width="36" Height="36"
+                            CornerRadius="8"
+                            Background="{StaticResource FsBgInput}"
+                            BorderBrush="{StaticResource FsBorderSubtle}"
+                            BorderThickness="1"
+                            Margin="0,0,12,0"
+                            VerticalAlignment="Center">
+                        <Image Width="20" Height="20"
+                               VerticalAlignment="Center"
+                               HorizontalAlignment="Center"
+                               RenderOptions.BitmapScalingMode="HighQuality"
+                               Source="pack://application:,,,/Everything2Everything;component/Assets/logo-mark.png"/>
+                    </Border>
+
+                    <StackPanel Grid.Column="1" VerticalAlignment="Center">
+                        <TextBlock Text="{Binding CurrentLargeAd.Title, FallbackValue='비즈니스 미디어 솔루션'}"
+                                   Style="{StaticResource FsLabelStyle}"
+                                   Foreground="{StaticResource FsTextPrimary}"
+                                   FontWeight="SemiBold"
+                                   FontSize="13"
+                                   TextTrimming="CharacterEllipsis"
+                                   VerticalAlignment="Center"/>
+                        <TextBlock Text="{Binding CurrentLargeAd.Description, FallbackValue='고성능 무손실 일괄 변환을 업무 환경에 적용하세요.'}"
+                                   Style="{StaticResource FsCaptionStyle}"
+                                   Foreground="{StaticResource FsTextSecondary}"
+                                   Margin="0,3,0,0"
+                                   TextWrapping="Wrap"
+                                   VerticalAlignment="Center"/>
+                    </StackPanel>
+                </Grid>
+
+                <!-- 3. 하단 전면 CTA 버튼 -->
+                <Button Style="{StaticResource FsIslandPrimaryButtonStyle}"
+                        Height="34"
+                        Command="{Binding ClickLargeAdCommand}"
+                        ToolTip="자세히 보기">
+                    <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
+                        <TextBlock Text="{Binding CurrentLargeAd.CtaText, FallbackValue='솔루션 살펴보기'}"
+                                   FontSize="12"
+                                   FontWeight="SemiBold"
+                                   VerticalAlignment="Center"
+                                   TextTrimming="CharacterEllipsis"/>
+                        <ui:SymbolIcon Symbol="ArrowRight24"
+                                       FontSize="12"
+                                       Margin="6,0,0,0"
+                                       VerticalAlignment="Center"/>
+                    </StackPanel>
+                </Button>
+            </StackPanel>
+        </Border>
+    </Border>
+</UserControl>
diff --git a/src/Everything2Everything.App/Views/AdLargeCardControl.xaml.cs b/src/Everything2Everything.App/Views/AdLargeCardControl.xaml.cs
new file mode 100644
index 0000000..9cd71c5
--- /dev/null
+++ b/src/Everything2Everything.App/Views/AdLargeCardControl.xaml.cs
@@ -0,0 +1,11 @@
+using System.Windows.Controls;
+
+namespace Everything2Everything.App.Views;
+
+public partial class AdLargeCardControl : UserControl
+{
+    public AdLargeCardControl()
+    {
+        InitializeComponent();
+    }
+}
diff --git a/src/Everything2Everything.App/Views/MainWindow.xaml b/src/Everything2Everything.App/Views/MainWindow.xaml
index 708ccb9..b43f903 100644
--- a/src/Everything2Everything.App/Views/MainWindow.xaml
+++ b/src/Everything2Everything.App/Views/MainWindow.xaml
@@ -3,6 +3,7 @@
                  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                  xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"
                  xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
+                 xmlns:local="clr-namespace:Everything2Everything.App.Views"
                  Title="Everything2Everything"
                  Icon="pack://application:,,,/Everything2Everything;component/Assets/app-icon.png"
                  Width="1280" Height="960"
@@ -327,6 +328,26 @@
                                         </ComboBox>
                                     </StackPanel>
 
+                                    <!-- E. AI 텍스트 변환 작업 선택기 (TXT/MD) -->
+                                    <StackPanel x:Name="AiQuickPanel" Margin="0,0,0,6" Visibility="Collapsed">
+                                        <TextBlock Text="AI 변환 작업" Style="{StaticResource FsLabelStyle}" Margin="0,0,0,4"/>
+                                        <ComboBox x:Name="AiTaskQuickCombo"
+                                                  AutomationProperties.AutomationId="AiTaskQuickCombo"
+                                                  SelectedIndex="{Binding Options.AiTaskIndex, RelativeSource={RelativeSource AncestorType=Window}, Mode=TwoWay}"
+                                                  SelectionChanged="OnAiTaskSelectionChanged">
+                                            <ComboBoxItem Content="핵심 요약 (Summarize)"/>
+                                            <ComboBoxItem Content="다국어 번역 (Translate)"/>
+                                            <ComboBoxItem Content="오탈자 및 문법 교정 (Proofread)"/>
+                                        </ComboBox>
+                                        <StackPanel x:Name="AiTargetLanguagePanel" Margin="0,8,0,0" Visibility="Collapsed">
+                                            <TextBlock Text="번역 대상 언어" Style="{StaticResource FsCaptionStyle}" Margin="0,0,0,4"/>
+                                            <TextBox x:Name="AiTargetLanguageBox"
+                                                     Style="{StaticResource FsPathInputStyle}"
+                                                     Padding="10,6"
+                                                     Text="{Binding Options.TargetLanguage, RelativeSource={RelativeSource AncestorType=Window}, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
+                                        </StackPanel>
+                                    </StackPanel>
+
                                     <!-- 5. 상세 인코딩 설정 (폴드아웃 Expander: 프리셋 직하단 위치) -->
                                     <Expander x:Name="AdvancedOptionsExpander"
                                               Margin="0,6,0,6"
@@ -666,17 +687,18 @@
                     <Border Grid.Row="0" Grid.Column="0"
                             Background="{StaticResource FsBgPanel}"
                             BorderBrush="{StaticResource FsBorderSubtle}"
-                            BorderThickness="0,0,1,1" Padding="16,8">
+                            BorderThickness="0,0,1,1" Padding="12,8">
                         <Grid>
                             <Grid.ColumnDefinitions>
-                                <ColumnDefinition Width="175"/>
-                                <ColumnDefinition Width="*"/>
+                                <ColumnDefinition Width="*" MinWidth="110"/>
+                                <ColumnDefinition Width="Auto"/>
+                                <ColumnDefinition Width="Auto"/>
                             </Grid.ColumnDefinitions>
-                            <!-- Search Box with Live Watermark & Clear Button -->
-                            <Grid Grid.Column="0" Width="175" VerticalAlignment="Center">
+                            <!-- Search Box with Live Watermark & Clear Button (Flex Width) -->
+                            <Grid Grid.Column="0" Margin="0,0,8,0" VerticalAlignment="Center">
                                 <TextBox x:Name="SearchBox" Style="{StaticResource FsPathInputStyle}"
                                          Padding="28,5,24,5" Text="{Binding SearchText, RelativeSource={RelativeSource AncestorType=Window}, UpdateSourceTrigger=PropertyChanged}"
-                                         ToolTip="파일명 또는 확장자로 검색" VerticalAlignment="Center"/>
+                                         ToolTip="파일명 또는 확장자로 검색" VerticalAlignment="Center" HorizontalAlignment="Stretch"/>
                                 <ui:SymbolIcon Symbol="Search24" FontSize="13" Foreground="{StaticResource FsTextTertiary}"
                                                HorizontalAlignment="Left" VerticalAlignment="Center" Margin="8,0,0,0" IsHitTestVisible="False"/>
                                 <TextBlock x:Name="SearchPlaceholderText"
@@ -720,49 +742,26 @@
                                     <ui:SymbolIcon Symbol="Dismiss24" FontSize="10" Foreground="{StaticResource FsTextTertiary}" VerticalAlignment="Center"/>
                                 </Button>
                             </Grid>
-                            <!-- Category Filter Chips & Inspector Toggle -->
-                            <StackPanel Grid.Column="1" Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Center">
-                                <Button Margin="0,0,3,0" Padding="7,3" Style="{StaticResource FsSecondaryButtonStyle}"
-                                        Command="{Binding FilterCategoryCommand, RelativeSource={RelativeSource AncestorType=Window}}"
-                                        CommandParameter="All">
-                                    <TextBlock Text="전체" FontSize="11" VerticalAlignment="Center"/>
-                                </Button>
-                                <Button Margin="0,0,3,0" Padding="7,3" Style="{StaticResource FsSecondaryButtonStyle}"
-                                        Command="{Binding FilterCategoryCommand, RelativeSource={RelativeSource AncestorType=Window}}"
-                                        CommandParameter="Image">
-                                    <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
-                                        <ui:SymbolIcon Symbol="Image24" FontSize="11" VerticalAlignment="Center" Margin="0,0,4,0"/>
-                                        <TextBlock Text="이미지" FontSize="11" VerticalAlignment="Center"/>
-                                    </StackPanel>
-                                </Button>
-                                <Button Margin="0,0,3,0" Padding="7,3" Style="{StaticResource FsSecondaryButtonStyle}"
-                                        Command="{Binding FilterCategoryCommand, RelativeSource={RelativeSource AncestorType=Window}}"
-                                        CommandParameter="Document">
-                                    <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
-                                        <ui:SymbolIcon Symbol="Document24" FontSize="11" VerticalAlignment="Center" Margin="0,0,4,0"/>
-                                        <TextBlock Text="문서" FontSize="11" VerticalAlignment="Center"/>
-                                    </StackPanel>
-                                </Button>
-                                <Button Margin="0,0,3,0" Padding="7,3" Style="{StaticResource FsSecondaryButtonStyle}"
-                                        Command="{Binding FilterCategoryCommand, RelativeSource={RelativeSource AncestorType=Window}}"
-                                        CommandParameter="Media">
-                                    <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
-                                        <ui:SymbolIcon Symbol="Video24" FontSize="11" VerticalAlignment="Center" Margin="0,0,4,0"/>
-                                        <TextBlock Text="미디어" FontSize="11" VerticalAlignment="Center"/>
-                                    </StackPanel>
-                                </Button>
-                                <Button Margin="0,0,3,0" Padding="7,3" Style="{StaticResource FsSecondaryButtonStyle}"
-                                        Command="{Binding FilterCategoryCommand, RelativeSource={RelativeSource AncestorType=Window}}"
-                                        CommandParameter="Data">
-                                    <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
-                                        <ui:SymbolIcon Symbol="Database24" FontSize="11" VerticalAlignment="Center" Margin="0,0,4,0"/>
-                                        <TextBlock Text="데이터" FontSize="11" VerticalAlignment="Center"/>
-                                    </StackPanel>
-                                </Button>
-                                <Border Width="1" Height="14" Background="{StaticResource FsBorderSubtle}" Margin="5,0"/>
-                                <Button Padding="7,3" Style="{StaticResource FsSecondaryButtonStyle}"
+                            <!-- 카테고리 필터 폴드아웃 드롭다운 -->
+                            <ComboBox x:Name="CategoryFilterCombo" Grid.Column="1"
+                                      AutomationProperties.AutomationId="CategoryFilterCombo"
+                                      MinWidth="90" Height="28" Padding="10,4"
+                                      FontSize="11" VerticalAlignment="Center"
+                                      ToolTip="카테고리 필터 (전체 · 이미지 · 문서 · 미디어 · 데이터)"
+                                      SelectionChanged="OnCategoryFilterSelectionChanged">
+                                <ComboBoxItem Tag="All" IsSelected="True" Content="전체"/>
+                                <ComboBoxItem Tag="Image" Content="이미지"/>
+                                <ComboBoxItem Tag="Document" Content="문서"/>
+                                <ComboBoxItem Tag="Media" Content="미디어"/>
+                                <ComboBoxItem Tag="Data" Content="데이터"/>
+                            </ComboBox>
+                            <!-- 구분선 & 미리보기 토글 버튼 -->
+                            <StackPanel Grid.Column="2" Orientation="Horizontal" VerticalAlignment="Center" Margin="6,0,0,0">
+                                <Border Width="1" Height="14" Background="{StaticResource FsBorderSubtle}" Margin="2,0,6,0"/>
+                                <Button Padding="7,4" Height="28" Style="{StaticResource FsSecondaryButtonStyle}"
                                         Command="{Binding ToggleInspectorCommand, RelativeSource={RelativeSource AncestorType=Window}}"
-                                        ToolTip="미리보기 패널 접기/펼치기">
+                                        ToolTip="미리보기 패널 접기/펼치기"
+                                        VerticalAlignment="Center">
                                     <StackPanel Orientation="Horizontal" VerticalAlignment="Center">
                                         <ui:SymbolIcon Symbol="PreviewLink24" FontSize="11" VerticalAlignment="Center" Margin="0,0,4,0"/>
                                         <TextBlock Text="미리보기" FontSize="11" VerticalAlignment="Center"/>
@@ -774,8 +773,13 @@
 
                     <!-- 좌측: Active Queue OR Past Results -->
                     <Grid Grid.Row="1" Grid.Column="0">
-                    <!-- Active Queue view (default) -->
-                    <Grid x:Name="ActiveQueueView" Visibility="Visible">
+                        <Grid.RowDefinitions>
+                            <RowDefinition Height="*"/>
+                            <RowDefinition Height="Auto"/>
+                        </Grid.RowDefinitions>
+
+                        <!-- Active Queue view (default) -->
+                        <Grid x:Name="ActiveQueueView" Grid.Row="0" Visibility="Visible">
                         <Grid.RowDefinitions>
                             <RowDefinition Height="Auto"/>
                             <RowDefinition Height="*"/>
@@ -1012,7 +1016,7 @@
                 </Grid>
 
                     <!-- Past Results view -->
-                    <Grid x:Name="PastResultsContainer" Visibility="Collapsed">
+                    <Grid x:Name="PastResultsContainer" Grid.Row="0" Visibility="Collapsed">
                         <Grid.RowDefinitions>
                             <RowDefinition Height="Auto"/>
                             <RowDefinition Height="*"/>
@@ -1229,6 +1233,9 @@
                         </Grid>
                     </Grid>
 
+                        <!-- 가로 슬림 배너 광고 슬롯 -->
+                        <local:AdBannerControl Grid.Row="1" Margin="12,4,12,8"
+                                               DataContext="{Binding AdVm, RelativeSource={RelativeSource AncestorType=Window}}"/>
                     </Grid>
                     <!-- /좌측 컬럼 끝 -->
 
@@ -1468,6 +1475,10 @@
                                             </StackPanel>
                                         </Button>
                                     </Grid>
+
+                                    <!-- 대형 카드 광고 슬롯 (스폰서십 및 솔루션 안내) -->
+                                    <local:AdLargeCardControl Margin="0,12,0,0"
+                                                              DataContext="{Binding AdVm, RelativeSource={RelativeSource AncestorType=Window}}"/>
                                 </StackPanel>
                             </Border>
                         </Grid>
diff --git a/src/Everything2Everything.App/Views/MainWindow.xaml.cs b/src/Everything2Everything.App/Views/MainWindow.xaml.cs
index 69a4beb..0805fde 100644
--- a/src/Everything2Everything.App/Views/MainWindow.xaml.cs
+++ b/src/Everything2Everything.App/Views/MainWindow.xaml.cs
@@ -12,6 +12,7 @@ using Everything2Everything.App.Shell;
 using Everything2Everything.App.ViewModels;
 using Everything2Everything.Core;
 using Everything2Everything.Core.Filters;
+using Everything2Everything.Core.Ads;
 using Everything2Everything.Core.Inspector;
 using Everything2Everything.Core.Presets;
 using LossClass = Everything2Everything.Core.Providers.LossClass;
@@ -134,15 +135,22 @@ public partial class MainWindow : Wpf.Ui.Controls.FluentWindow, INotifyPropertyC
             if (_selectedCategory != value)
             {
                 _selectedCategory = value;
+                if (CategoryFilterCombo != null && CategoryFilterCombo.SelectedIndex != (int)value)
+                {
+                    CategoryFilterCombo.SelectedIndex = (int)value;
+                }
                 ApplyQueueFilters();
             }
         }
     }
 
-    public MainWindow(ConversionEngine engine, ISettingsStore settings, IReadOnlyList<string>? initialFiles = null)
+    public AdViewModel AdVm { get; }
+
+    public MainWindow(ConversionEngine engine, ISettingsStore settings, IReadOnlyList<string>? initialFiles = null, IAdService? adService = null)
     {
         _engine = engine;
         _settings = settings;
+        AdVm = new AdViewModel(adService ?? new AdService());
 
         AddFilesCommand = new RelayCommand(_ => PickAndAddFiles());
         ProcessQueueCommand = new RelayCommand(_ => OnProcessQueueClick(this, new RoutedEventArgs()),
@@ -828,6 +836,18 @@ public partial class MainWindow : Wpf.Ui.Controls.FluentWindow, INotifyPropertyC
         }
     }
 
+    private void OnCategoryFilterSelectionChanged(object sender, SelectionChangedEventArgs e)
+    {
+        if (CategoryFilterCombo?.SelectedItem is ComboBoxItem item && item.Tag is string tag)
+        {
+            ApplyFilterCategory(tag);
+        }
+        else if (CategoryFilterCombo != null && CategoryFilterCombo.SelectedIndex >= 0)
+        {
+            SelectedCategory = (FilterCategory)CategoryFilterCombo.SelectedIndex;
+        }
+    }
+
     private void ApplyFilterCategory(string? categoryName)
     {
         if (Enum.TryParse<FilterCategory>(categoryName, true, out var cat))
@@ -1540,9 +1560,25 @@ public partial class MainWindow : Wpf.Ui.Controls.FluentWindow, INotifyPropertyC
         if (PdfQuickPanel is not null)
             PdfQuickPanel.Visibility = isPdf ? Visibility.Visible : Visibility.Collapsed;
 
+        var isText = ext is ".txt" or ".md";
+        if (AiQuickPanel is not null)
+            AiQuickPanel.Visibility = isText ? Visibility.Visible : Visibility.Collapsed;
+        if (AiTargetLanguagePanel is not null && AiTaskQuickCombo is not null)
+            AiTargetLanguagePanel.Visibility = (isText && AiTaskQuickCombo.SelectedIndex == 1)
+                ? Visibility.Visible
+                : Visibility.Collapsed;
+
         UpdateMediaPanelForFormat(extension);
     }
 
+    private void OnAiTaskSelectionChanged(object sender, SelectionChangedEventArgs e)
+    {
+        if (AiTargetLanguagePanel is null || AiTaskQuickCombo is null) return;
+        AiTargetLanguagePanel.Visibility = AiTaskQuickCombo.SelectedIndex == 1
+            ? Visibility.Visible
+            : Visibility.Collapsed;
+    }
+
     /// <summary>출력이 영상/오디오/PDF/이미지일 때 상세 인코딩 폴드아웃 서브패널 노출(Fluent 2 점진적 공개 패턴).</summary>
     private void UpdateMediaPanelForFormat(string? extension)
     {
diff --git a/src/Everything2Everything.App/Views/QuickOptionsWindow.xaml b/src/Everything2Everything.App/Views/QuickOptionsWindow.xaml
index d052836..25117b7 100644
--- a/src/Everything2Everything.App/Views/QuickOptionsWindow.xaml
+++ b/src/Everything2Everything.App/Views/QuickOptionsWindow.xaml
@@ -74,6 +74,20 @@
                 </ComboBox>
             </StackPanel>
 
+            <!-- AI 텍스트 처리 (txt/md) -->
+            <StackPanel x:Name="AiQuickPanel" Margin="0,18,0,0" Visibility="Collapsed">
+                <TextBlock Text="AI 작업 선택" Style="{StaticResource FsCaptionStyle}" Margin="0,0,0,4"/>
+                <ComboBox SelectedIndex="{Binding AiTaskIndex, Mode=TwoWay}">
+                    <ComboBoxItem Content="핵심 요약 (Summarize)"/>
+                    <ComboBoxItem Content="자연스러운 번역 (Translate)"/>
+                    <ComboBoxItem Content="오탈자 및 문법 교정 (Proofread)"/>
+                </ComboBox>
+                <TextBox Margin="0,8,0,0" Style="{StaticResource FsPathInputStyle}"
+                         Padding="10,6"
+                         Text="{Binding TargetLanguage, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
+                         ToolTip="번역 시 대상 언어 (예: 영어, 일본어, 중국어)"/>
+            </StackPanel>
+
             <!-- 버튼 -->
             <Grid Margin="0,22,0,0">
                 <Button HorizontalAlignment="Left" Content="자세히 옵션…"
diff --git a/src/Everything2Everything.App/Views/QuickOptionsWindow.xaml.cs b/src/Everything2Everything.App/Views/QuickOptionsWindow.xaml.cs
index 2231979..b61a806 100644
--- a/src/Everything2Everything.App/Views/QuickOptionsWindow.xaml.cs
+++ b/src/Everything2Everything.App/Views/QuickOptionsWindow.xaml.cs
@@ -34,10 +34,12 @@ public partial class QuickOptionsWindow : FluentWindow
         var isVideo = ext is ".mp4" or ".mkv" or ".webm" or ".mov" or ".avi";
         var isLossyAudio = ext is ".mp3" or ".aac" or ".m4a" or ".opus" or ".ogg";
         var isImageQuality = ext is ".jpg" or ".jpeg" or ".webp" or ".avif";
+        var isText = ext is ".txt" or ".md";
 
         VideoQuickPanel.Visibility = isVideo ? Visibility.Visible : Visibility.Collapsed;
         AudioQuickPanel.Visibility = (isVideo || isLossyAudio) ? Visibility.Visible : Visibility.Collapsed;
         ImageQualityPanel.Visibility = isImageQuality ? Visibility.Visible : Visibility.Collapsed;
+        AiQuickPanel.Visibility = isText ? Visibility.Visible : Visibility.Collapsed;
 
         // 영상의 오디오 트랙임을 구분
         if (isVideo) AudioPanelLabel.Text = "오디오 비트레이트";
diff --git a/src/Everything2Everything.App/Views/SettingsWindow.xaml b/src/Everything2Everything.App/Views/SettingsWindow.xaml
index 9e5b022..62234cc 100644
--- a/src/Everything2Everything.App/Views/SettingsWindow.xaml
+++ b/src/Everything2Everything.App/Views/SettingsWindow.xaml
@@ -39,12 +39,48 @@
 
                             <TextBlock Text="기본 백엔드" Style="{StaticResource FsLabelStyle}" Margin="0,0,0,6"/>
                             <ComboBox x:Name="BackendCombo" Margin="0,0,0,16">
-                                <ComboBoxItem Content="자동 (API 키 우선, 없으면 Codex)"/>
+                                <ComboBoxItem Content="자동 (API 키 우선 · Switchboard · Antigravity · Codex)"/>
+                                <ComboBoxItem Content="Switchboard 게이트웨이 (http://127.0.0.1:8787 · 로컬/LAN)"/>
+                                <ComboBoxItem Content="Antigravity CLI (agy · Gemini OAuth · 무료/구독)"/>
                                 <ComboBoxItem Content="OpenAI (API 키)"/>
                                 <ComboBoxItem Content="Anthropic (API 키)"/>
                                 <ComboBoxItem Content="Codex CLI (ChatGPT 구독 OAuth)"/>
                             </ComboBox>
 
+                            <!-- Switchboard Gateway -->
+                            <TextBlock Text="Switchboard 게이트웨이 (로컬/LAN 멀티에이전트 오케스트레이션)" Style="{StaticResource FsLabelStyle}" Margin="0,0,0,6"/>
+                            <Grid Margin="0,0,0,6">
+                                <Grid.ColumnDefinitions>
+                                    <ColumnDefinition Width="*"/>
+                                    <ColumnDefinition Width="Auto"/>
+                                    <ColumnDefinition Width="Auto"/>
+                                </Grid.ColumnDefinitions>
+                                <TextBox x:Name="SwitchboardEndpointBox" Grid.Column="0"
+                                         Style="{StaticResource FsPathInputStyle}"
+                                         TextChanged="OnSwitchboardEndpointChanged"/>
+                                <Button x:Name="SwitchboardVerifyBtn" Grid.Column="1" Content="테스트"
+                                        Style="{StaticResource FsSecondaryButtonStyle}" Margin="8,0,0,0"
+                                        Padding="12,6" Click="OnVerifySwitchboard"/>
+                                <Button x:Name="SwitchboardStartBtn" Grid.Column="2" Content="게이트웨이 기동"
+                                        Style="{StaticResource FsSecondaryButtonStyle}" Margin="8,0,0,0"
+                                        Padding="12,6" Click="OnStartSwitchboardGateway"/>
+                            </Grid>
+                            <StackPanel Orientation="Horizontal" VerticalAlignment="Center" Margin="0,0,0,16">
+                                <Ellipse x:Name="SwitchboardDot" Style="{StaticResource FsLossDotStyle}"
+                                         Fill="{StaticResource FsTextTertiary}" Margin="0,0,7,0" VerticalAlignment="Center"/>
+                                <TextBlock x:Name="SwitchboardStatus" Text="확인 중…" Style="{StaticResource FsCaptionStyle}" TextTrimming="CharacterEllipsis" VerticalAlignment="Center"/>
+                            </StackPanel>
+
+                            <!-- Antigravity CLI (OAuth) -->
+                            <TextBlock Text="Antigravity CLI (agy · Google OAuth · API 키 불필요)" Style="{StaticResource FsLabelStyle}" Margin="0,0,0,6"/>
+                            <StackPanel Orientation="Horizontal" VerticalAlignment="Center" Margin="0,0,0,16">
+                                <Ellipse x:Name="AgyDot" Style="{StaticResource FsLossDotStyle}"
+                                         Fill="{StaticResource FsTextTertiary}" Margin="0,0,7,0" VerticalAlignment="Center"/>
+                                <TextBlock x:Name="AgyStatus" Text="확인 중…" Style="{StaticResource FsCaptionStyle}" VerticalAlignment="Center"/>
+                                <Button x:Name="AgyVerifyBtn" Content="테스트" Style="{StaticResource FsSecondaryButtonStyle}"
+                                        Margin="12,0,0,0" Padding="10,4" IsEnabled="False" Click="OnVerifyAgy" VerticalAlignment="Center"/>
+                            </StackPanel>
+
                             <!-- OpenAI -->
                             <TextBlock Text="OpenAI API Key" Style="{StaticResource FsLabelStyle}" Margin="0,0,0,6"/>
                             <Grid Margin="0,0,0,4">
@@ -111,6 +147,9 @@
                             <TextBlock Text="외부 도구" Style="{StaticResource FsBodyStyle}" FontWeight="SemiBold" FontSize="15"/>
                             <TextBlock Text="설치하면 영상/오디오·한글/Word 변환이 자동 활성화됩니다."
                                        Style="{StaticResource FsCaptionStyle}" TextWrapping="Wrap" Margin="0,4,0,12"/>
+                            <Button Content="외부 도구 설치 / 검증" Style="{StaticResource FsSecondaryButtonStyle}"
+                                    Padding="14,6" HorizontalAlignment="Right" Margin="0,0,0,12"
+                                    Click="OnOpenToolInstaller"/>
                             <CheckBox x:Name="GpuToggle" Content="영상 변환 시 GPU 가속(NVENC) 시도 — 없으면 CPU 자동 전환"
                                       Foreground="{StaticResource FsTextSecondary}" IsChecked="True" Margin="0,0,0,16"/>
 
diff --git a/src/Everything2Everything.App/Views/SettingsWindow.xaml.cs b/src/Everything2Everything.App/Views/SettingsWindow.xaml.cs
index 398b6a9..d891914 100644
--- a/src/Everything2Everything.App/Views/SettingsWindow.xaml.cs
+++ b/src/Everything2Everything.App/Views/SettingsWindow.xaml.cs
@@ -26,12 +26,15 @@ public partial class SettingsWindow : Wpf.Ui.Controls.FluentWindow
         var backend = (_settings.Get("ai.backend") ?? "auto").ToLowerInvariant();
         BackendCombo.SelectedIndex = backend switch
         {
-            "openai" => 1,
-            "anthropic" => 2,
-            "codex" => 3,
+            "switchboard" or "gateway" => 1,
+            "agy" => 2,
+            "openai" => 3,
+            "anthropic" => 4,
+            "codex" => 5,
             _ => 0,
         };
         ModelBox.Text = _settings.Get("ai.model") ?? string.Empty;
+        SwitchboardEndpointBox.Text = _settings.Get("switchboard.endpoint") ?? "http://127.0.0.1:8787";
 
         SetKeyStatus(OpenAiDot, OpenAiStatus, _settings.Contains("openai.apikey"), HasEnv("OPENAI_API_KEY"));
         SetKeyStatus(AnthropicDot, AnthropicStatus, _settings.Contains("anthropic.apikey"), HasEnv("ANTHROPIC_API_KEY"));
@@ -58,6 +61,9 @@ public partial class SettingsWindow : Wpf.Ui.Controls.FluentWindow
     private void OnAnthropicKeyChanged(object sender, RoutedEventArgs e)
         => AnthropicVerifyBtn.IsEnabled = AnthropicKeyBox.Password.StartsWith("sk-ant-", StringComparison.Ordinal);
 
+    private void OnSwitchboardEndpointChanged(object sender, TextChangedEventArgs e)
+        => _ = CheckSwitchboardGatewayAsync();
+
     private async void OnVerifyOpenAi(object sender, RoutedEventArgs e)
         => await VerifyAsync(OpenAiDot, OpenAiStatus, OpenAiVerifyBtn,
             new OpenAiChatClient(OpenAiKeyBox.Password), ModelOr("gpt-4o-mini"));
@@ -66,6 +72,63 @@ public partial class SettingsWindow : Wpf.Ui.Controls.FluentWindow
         => await VerifyAsync(AnthropicDot, AnthropicStatus, AnthropicVerifyBtn,
             new AnthropicChatClient(AnthropicKeyBox.Password), ModelOr("claude-3-5-sonnet-latest"));
 
+    private async void OnVerifySwitchboard(object sender, RoutedEventArgs e)
+    {
+        var ep = string.IsNullOrWhiteSpace(SwitchboardEndpointBox.Text)
+            ? (_settings.Get("switchboard.endpoint") ?? "http://127.0.0.1:8787")
+            : SwitchboardEndpointBox.Text.Trim();
+        await VerifyAsync(SwitchboardDot, SwitchboardStatus, SwitchboardVerifyBtn,
+            new SwitchboardChatClient(ep), ModelOr(string.Empty));
+        await CheckSwitchboardGatewayAsync();
+    }
+
+    private void OnStartSwitchboardGateway(object sender, RoutedEventArgs e)
+    {
+        try
+        {
+            var candidates = new[]
+            {
+                @"D:\workspace\Switchboard\start-gateway-lan.cmd",
+                @"D:\workspace\Switchboard\start-gateway-agy.cmd",
+                @"D:\workspace\Switchboard\start-gateway.cmd",
+            };
+            string? cmdPath = candidates.FirstOrDefault(System.IO.File.Exists);
+            if (cmdPath is null)
+            {
+                var baseDir = AppDomain.CurrentDomain.BaseDirectory;
+                var relativeCandidates = new[]
+                {
+                    System.IO.Path.GetFullPath(System.IO.Path.Combine(baseDir, "..", "..", "..", "..", "..", "Switchboard", "start-gateway-lan.cmd")),
+                    System.IO.Path.GetFullPath(System.IO.Path.Combine(baseDir, "..", "..", "..", "..", "..", "Switchboard", "start-gateway-agy.cmd")),
+                    System.IO.Path.GetFullPath(System.IO.Path.Combine(baseDir, "..", "..", "..", "..", "..", "Switchboard", "start-gateway.cmd")),
+                };
+                cmdPath = relativeCandidates.FirstOrDefault(System.IO.File.Exists);
+            }
+
+            if (cmdPath is not null)
+            {
+                Process.Start(new ProcessStartInfo
+                {
+                    FileName = cmdPath,
+                    UseShellExecute = true,
+                    WorkingDirectory = System.IO.Path.GetDirectoryName(cmdPath)!,
+                });
+                SwitchboardStatus.Text = "게이트웨이 기동 중… 잠시 후 테스트를 누르세요.";
+            }
+            else
+            {
+                SwitchboardStatus.Text = "런처 스크립트를 찾을 수 없습니다 (start-gateway-lan.cmd).";
+            }
+        }
+        catch (Exception ex)
+        {
+            SwitchboardStatus.Text = "기동 실패: " + Trunc(ex.Message);
+        }
+    }
+
+    private async void OnVerifyAgy(object sender, RoutedEventArgs e)
+        => await VerifyAsync(AgyDot, AgyStatus, AgyVerifyBtn, new AgyChatClient(), ModelOr(string.Empty));
+
     private async void OnVerifyCodex(object sender, RoutedEventArgs e)
         => await VerifyAsync(CodexDot, CodexStatus, CodexVerifyBtn, new CodexChatClient(), ModelOr(string.Empty));
 
@@ -107,23 +170,59 @@ public partial class SettingsWindow : Wpf.Ui.Controls.FluentWindow
         LibreDot.Fill = Res(libre ? "FsStatusSuccess" : "FsStatusWarn");
         LibreStatus.Text = libre ? "준비됨" : "미설치";
 
+        _ = CheckSwitchboardGatewayAsync();
+
+        var agy = ExternalToolDetector.IsAgyAvailable(out _);
+        AgyDot.Fill = Res(agy ? "FsStatusSuccess" : "FsTextTertiary");
+        AgyStatus.Text = agy ? "설치됨 — 키 없이 사용 가능" : "미설치 (winget install Google.AntigravityCLI)";
+        AgyVerifyBtn.IsEnabled = agy;
+
         var codex = ExternalToolDetector.IsCodexAvailable();
         CodexDot.Fill = Res(codex ? "FsStatusSuccess" : "FsTextTertiary");
         CodexStatus.Text = codex ? "설치됨 — 키 없이 사용 가능" : "미설치 (npm i -g @openai/codex)";
         CodexVerifyBtn.IsEnabled = codex;
     }
 
+    private async Task CheckSwitchboardGatewayAsync()
+    {
+        if (SwitchboardDot is null || SwitchboardStatus is null) return;
+        var ep = string.IsNullOrWhiteSpace(SwitchboardEndpointBox?.Text)
+            ? (_settings.Get("switchboard.endpoint") ?? "http://127.0.0.1:8787")
+            : SwitchboardEndpointBox.Text.Trim();
+        var (ok, profile, resolvedEp) = await ExternalToolDetector.CheckSwitchboardGatewayHealthAsync(ep);
+        if (ok)
+        {
+            SwitchboardDot.Fill = Res("FsStatusSuccess");
+            SwitchboardStatus.Text = string.IsNullOrWhiteSpace(profile)
+                ? $"실행 중 ({resolvedEp})"
+                : $"실행 중 ({resolvedEp} · {profile})";
+            if (SwitchboardStartBtn is not null) SwitchboardStartBtn.IsEnabled = false;
+        }
+        else
+        {
+            SwitchboardDot.Fill = Res("FsTextTertiary");
+            SwitchboardStatus.Text = $"미실행 ({ep})";
+            if (SwitchboardStartBtn is not null) SwitchboardStartBtn.IsEnabled = true;
+        }
+    }
+
     private void OnSave(object sender, RoutedEventArgs e)
     {
         var backend = BackendCombo.SelectedIndex switch
         {
-            1 => "openai",
-            2 => "anthropic",
-            3 => "codex",
+            1 => "switchboard",
+            2 => "agy",
+            3 => "openai",
+            4 => "anthropic",
+            5 => "codex",
             _ => "auto",
         };
         _settings.Set("ai.backend", backend);
 
+        var sbEndpoint = SwitchboardEndpointBox.Text?.Trim();
+        if (!string.IsNullOrEmpty(sbEndpoint))
+            _settings.Set("switchboard.endpoint", sbEndpoint);
+
         var model = ModelBox.Text?.Trim();
         if (string.IsNullOrEmpty(model)) _settings.Remove("ai.model");
         else _settings.Set("ai.model", model);
@@ -137,6 +236,13 @@ public partial class SettingsWindow : Wpf.Ui.Controls.FluentWindow
 
     private void OnClose(object sender, RoutedEventArgs e) => Close();
 
+    private void OnOpenToolInstaller(object sender, RoutedEventArgs e)
+    {
+        var win = new ToolSetupWindow { Owner = this };
+        win.ShowDialog();
+        RefreshToolStatus();
+    }
+
     private void OnDownloadFfmpeg(object sender, RoutedEventArgs e)
         => OpenUrl("https://github.com/BtbN/FFmpeg-Builds/releases");
 
diff --git a/src/Everything2Everything.App/Views/ToolSetupWindow.xaml b/src/Everything2Everything.App/Views/ToolSetupWindow.xaml
new file mode 100644
index 0000000..883495d
--- /dev/null
+++ b/src/Everything2Everything.App/Views/ToolSetupWindow.xaml
@@ -0,0 +1,88 @@
+<ui:FluentWindow x:Class="Everything2Everything.App.Views.ToolSetupWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"
+    Title="처음 설정 — 외부 도구 설치"
+    Width="640" Height="680"
+    WindowStartupLocation="CenterScreen"
+    ExtendsContentIntoTitleBar="True"
+    WindowBackdropType="Mica"
+    Background="{DynamicResource FsBgBase}">
+
+    <Window.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ui:ControlsDictionary/>
+                <ResourceDictionary Source="FormatShiftTheme.xaml"/>
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Window.Resources>
+
+    <Grid Background="{StaticResource FsBgBase}">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="*"/>
+            <RowDefinition Height="Auto"/>
+        </Grid.RowDefinitions>
+
+        <ui:TitleBar Grid.Row="0" Title="처음 설정" ShowMaximize="False" ShowMinimize="False"/>
+
+        <ScrollViewer Grid.Row="1" VerticalScrollBarVisibility="Auto" Padding="24,8,24,16">
+            <StackPanel>
+                <TextBlock Text="필요한 외부 도구를 설치합니다."
+                           Style="{StaticResource FsBodyStyle}" FontWeight="SemiBold" FontSize="16"/>
+                <TextBlock Text="변환에 필요한 외부 도구 목록입니다. 기본값은 모두 선택된 상태이며, 아래 버튼으로 한 번에 순차 설치합니다. 이미 설치된 도구는 설치 단계에서 확인만 됩니다. (H2Orestart는 라이선스상 자동 설치 대신 직접 추가가 필요합니다.)"
+                           Style="{StaticResource FsCaptionStyle}" TextWrapping="Wrap" Margin="0,4,0,16"/>
+
+                <ItemsControl ItemsSource="{Binding Tools}">
+                    <ItemsControl.ItemTemplate>
+                        <DataTemplate>
+                            <Border Style="{StaticResource FsDoubleBezelShellStyle}" Margin="0,0,0,10" HorizontalAlignment="Stretch">
+                                <Border Style="{StaticResource FsDoubleBezelCoreStyle}" Padding="16,12">
+                                    <Grid>
+                                        <Grid.ColumnDefinitions>
+                                            <ColumnDefinition Width="Auto"/>
+                                            <ColumnDefinition Width="*"/>
+                                            <ColumnDefinition Width="Auto"/>
+                                        </Grid.ColumnDefinitions>
+                                        <CheckBox Grid.Column="0" IsChecked="{Binding IsSelected}"
+                                                  VerticalAlignment="Center" Margin="0,0,12,0"/>
+                                        <StackPanel Grid.Column="1" Margin="0,0,12,0">
+                                            <TextBlock Text="{Binding Name}" Style="{StaticResource FsBodyStyle}" FontWeight="Medium"/>
+                                            <TextBlock Text="{Binding Description}" Style="{StaticResource FsCaptionStyle}"
+                                                       TextWrapping="Wrap" Margin="0,3,0,0"/>
+                                        </StackPanel>
+                                        <StackPanel Grid.Column="2" Orientation="Horizontal" VerticalAlignment="Center">
+                                            <Ellipse Width="9" Height="9" Style="{StaticResource FsLossDotStyle}"
+                                                     Fill="{Binding StatusBrush}" VerticalAlignment="Center" Margin="0,0,7,0"/>
+                                            <TextBlock Text="{Binding StatusText}" Style="{StaticResource FsCaptionStyle}"
+                                                       VerticalAlignment="Center"/>
+                                        </StackPanel>
+                                    </Grid>
+                                </Border>
+                            </Border>
+                        </DataTemplate>
+                    </ItemsControl.ItemTemplate>
+                </ItemsControl>
+            </StackPanel>
+        </ScrollViewer>
+
+        <Border Grid.Row="2" Background="{StaticResource FsBgPanel}"
+                BorderBrush="{StaticResource FsBorderSubtle}" BorderThickness="0,1,0,0" Padding="24,14">
+            <Grid>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="Auto"/>
+                    <ColumnDefinition Width="*"/>
+                    <ColumnDefinition Width="Auto"/>
+                </Grid.ColumnDefinitions>
+                <CheckBox Grid.Column="0" IsChecked="{Binding SelectAll}" Content="전체 선택"
+                          Foreground="{StaticResource FsTextSecondary}" VerticalAlignment="Center"/>
+                <StackPanel Grid.Column="2" Orientation="Horizontal" HorizontalAlignment="Right">
+                    <Button Content="나중에" Style="{StaticResource FsSecondaryButtonStyle}" Padding="20,8" Click="OnLater"/>
+                    <Button x:Name="InstallButton" Content="설치 시작"
+                            Style="{StaticResource FsPrimaryButtonStyle}" Padding="20,8" Margin="8,0,0,0" Click="OnInstall"/>
+                </StackPanel>
+            </Grid>
+        </Border>
+    </Grid>
+</ui:FluentWindow>
diff --git a/src/Everything2Everything.App/Views/ToolSetupWindow.xaml.cs b/src/Everything2Everything.App/Views/ToolSetupWindow.xaml.cs
new file mode 100644
index 0000000..1ae7eec
--- /dev/null
+++ b/src/Everything2Everything.App/Views/ToolSetupWindow.xaml.cs
@@ -0,0 +1,46 @@
+using System.Threading;
+using System.Windows;
+using Everything2Everything.App.ViewModels;
+
+namespace Everything2Everything.App.Views;
+
+/// <summary>첫 실행 외부 도구 설치 마법사. 선택된(기본 전체) 도구를 순차 설치하고 상태를 갱신한다.</summary>
+public partial class ToolSetupWindow : Wpf.Ui.Controls.FluentWindow
+{
+    private readonly ToolSetupViewModel _vm;
+    private CancellationTokenSource? _cts;
+
+    public ToolSetupWindow()
+    {
+        InitializeComponent();
+        _vm = new ToolSetupViewModel();
+        DataContext = _vm;
+    }
+
+    private async void OnInstall(object sender, RoutedEventArgs e)
+    {
+        if (_vm.IsInstalling) return;
+        _cts = new CancellationTokenSource();
+        InstallButton.IsEnabled = false;
+        try
+        {
+            await _vm.InstallSelectedAsync(_cts.Token);
+        }
+        finally
+        {
+            InstallButton.IsEnabled = true;
+        }
+    }
+
+    private void OnLater(object sender, RoutedEventArgs e)
+    {
+        _cts?.Cancel();
+        Close();
+    }
+
+    protected override void OnClosed(EventArgs e)
+    {
+        _cts?.Cancel();
+        base.OnClosed(e);
+    }
+}
diff --git a/src/Everything2Everything.Core/Ads/AdItem.cs b/src/Everything2Everything.Core/Ads/AdItem.cs
new file mode 100644
index 0000000..b6bac2a
--- /dev/null
+++ b/src/Everything2Everything.Core/Ads/AdItem.cs
@@ -0,0 +1,21 @@
+namespace Everything2Everything.Core.Ads;
+
+public enum AdType
+{
+    Banner,
+    LargeCard
+}
+
+public class AdItem
+{
+    public string Id { get; set; } = string.Empty;
+    public string Title { get; set; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
+    public string BadgeText { get; set; } = "AD";
+    public string ImageUrl { get; set; } = string.Empty;
+    public string TargetUrl { get; set; } = string.Empty;
+    public string CtaText { get; set; } = "자세히 보기";
+    public AdType Type { get; set; } = AdType.Banner;
+    public bool IsActive { get; set; } = true;
+    public int DisplayOrder { get; set; } = 0;
+}
diff --git a/src/Everything2Everything.Core/Ads/AdMobConfig.cs b/src/Everything2Everything.Core/Ads/AdMobConfig.cs
new file mode 100644
index 0000000..7162de9
--- /dev/null
+++ b/src/Everything2Everything.Core/Ads/AdMobConfig.cs
@@ -0,0 +1,34 @@
+namespace Everything2Everything.Core.Ads;
+
+/// <summary>
+/// Google AdMob 공식 앱 ID, 광고 단위 ID 및 app-ads.txt 검증 구성 모델
+/// </summary>
+public class AdMobConfig
+{
+    /// <summary>Google AdMob 게시자 ID (예: pub-XXXXXXXXXXXXXXXX)</summary>
+    public string PublisherId { get; set; } = string.Empty;
+
+    /// <summary>AdMob 공식 앱 ID (형식: ca-app-pub-XXXXXXXXXXXXXXXX~YYYYYYYYYY)</summary>
+    public string AppId { get; set; } = string.Empty;
+
+    /// <summary>배너 광고 단위 ID (형식: ca-app-pub-XXXXXXXXXXXXXXXX/YYYYYYYYYY)</summary>
+    public string BannerAdUnitId { get; set; } = string.Empty;
+
+    /// <summary>전면/대형 카드 광고 단위 ID (형식: ca-app-pub-XXXXXXXXXXXXXXXX/ZZZZZZZZZZ)</summary>
+    public string InterstitialAdUnitId { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Google 공식 규격의 app-ads.txt 문자열 생성
+    /// 형식: google.com, pub-XXXXXXXXXXXXXXXX, DIRECT, f08c47fec0942fa0
+    /// </summary>
+    public string GenerateAppAdsTxt()
+    {
+        var pubId = PublisherId.Trim();
+        if (!pubId.StartsWith("pub-", System.StringComparison.OrdinalIgnoreCase) && !string.IsNullOrEmpty(pubId))
+        {
+            pubId = "pub-" + pubId;
+        }
+
+        return $"google.com, {pubId}, DIRECT, f08c47fec0942fa0";
+    }
+}
diff --git a/src/Everything2Everything.Core/Ads/AdService.cs b/src/Everything2Everything.Core/Ads/AdService.cs
new file mode 100644
index 0000000..a76eb3d
--- /dev/null
+++ b/src/Everything2Everything.Core/Ads/AdService.cs
@@ -0,0 +1,221 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Net.Http;
+using System.Text.Json;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Everything2Everything.Core.Ads;
+
+public class AdService : IAdService
+{
+    private static readonly HttpClient HttpClient = new() { Timeout = TimeSpan.FromSeconds(5) };
+    private readonly List<AdItem> _ads = new();
+    private readonly object _lock = new();
+    private int _bannerIndex = 0;
+    private int _largeCardIndex = 0;
+
+    public AdService()
+    {
+        InitializeDefaultAds();
+    }
+
+    private void InitializeDefaultAds()
+    {
+        lock (_lock)
+        {
+            _ads.Clear();
+
+            // Default House Banner Ads
+            _ads.Add(new AdItem
+            {
+                Id = "house-banner-sponsor-1",
+                Title = "초고속 무손실 미디어 솔루션",
+                Description = "Everything2Everything 공식 후원 및 제휴 파트너십을 확인하세요.",
+                BadgeText = "스폰서",
+                ImageUrl = "pack://application:,,,/Everything2Everything;component/Assets/logo-mark.png",
+                TargetUrl = "https://github.com/yunchan8804/Everything2Everthing",
+                CtaText = "자세히 보기",
+                Type = AdType.Banner,
+                IsActive = true,
+                DisplayOrder = 1
+            });
+
+            _ads.Add(new AdItem
+            {
+                Id = "house-banner-tip-2",
+                Title = "대용량 일괄 변환 최적화",
+                Description = "FFmpeg 및 LibRaw 가속 엔진으로 수천 장의 이미지를 순식간에 처리합니다.",
+                BadgeText = "AD",
+                ImageUrl = "pack://application:,,,/Everything2Everything;component/Assets/glyph-video.png",
+                TargetUrl = "https://github.com/yunchan8804/Everything2Everthing#features",
+                CtaText = "가이드 보기",
+                Type = AdType.Banner,
+                IsActive = true,
+                DisplayOrder = 2
+            });
+
+            // Default Large Card Ads
+            _ads.Add(new AdItem
+            {
+                Id = "house-large-card-1",
+                Title = "비즈니스 미디어 변환 엔진",
+                Description = "개인 및 기업을 위한 고성능 무손실 일괄 변환. 워터마크 없이 100% 무료로 자유롭게 활용하세요.",
+                BadgeText = "스폰서 추천",
+                ImageUrl = "pack://application:,,,/Everything2Everything;component/Assets/illus-done.png",
+                TargetUrl = "https://github.com/yunchan8804/Everything2Everthing",
+                CtaText = "파트너십 문의",
+                Type = AdType.LargeCard,
+                IsActive = true,
+                DisplayOrder = 1
+            });
+
+            _ads.Add(new AdItem
+            {
+                Id = "house-large-card-2",
+                Title = "스마트 AI 요약 & OCR 가속",
+                Description = "로컬 LLM과 Tesseract OCR을 결합하여 스캔 문서와 PDF를 즉시 검색 가능한 텍스트로 변환합니다.",
+                BadgeText = "AD",
+                ImageUrl = "pack://application:,,,/Everything2Everything;component/Assets/glyph-ai.png",
+                TargetUrl = "https://github.com/yunchan8804/Everything2Everthing",
+                CtaText = "기능 살펴보기",
+                Type = AdType.LargeCard,
+                IsActive = true,
+                DisplayOrder = 2
+            });
+        }
+    }
+
+    public IReadOnlyList<AdItem> GetBannerAds()
+    {
+        lock (_lock)
+        {
+            return _ads.Where(a => a.Type == AdType.Banner && a.IsActive).OrderBy(a => a.DisplayOrder).ToList();
+        }
+    }
+
+    public IReadOnlyList<AdItem> GetLargeCardAds()
+    {
+        lock (_lock)
+        {
+            return _ads.Where(a => a.Type == AdType.LargeCard && a.IsActive).OrderBy(a => a.DisplayOrder).ToList();
+        }
+    }
+
+    public AdItem? GetNextBannerAd()
+    {
+        var banners = GetBannerAds();
+        if (banners.Count == 0) return null;
+
+        lock (_lock)
+        {
+            var ad = banners[_bannerIndex % banners.Count];
+            _bannerIndex = (_bannerIndex + 1) % banners.Count;
+            return ad;
+        }
+    }
+
+    public AdItem? GetNextLargeCardAd()
+    {
+        var cards = GetLargeCardAds();
+        if (cards.Count == 0) return null;
+
+        lock (_lock)
+        {
+            var ad = cards[_largeCardIndex % cards.Count];
+            _largeCardIndex = (_largeCardIndex + 1) % cards.Count;
+            return ad;
+        }
+    }
+
+    public int LoadAdsFromJson(string json)
+    {
+        if (string.IsNullOrWhiteSpace(json)) return 0;
+
+        try
+        {
+            var options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
+            var items = JsonSerializer.Deserialize<List<AdItem>>(json, options);
+            if (items == null || items.Count == 0) return 0;
+
+            lock (_lock)
+            {
+                foreach (var item in items)
+                {
+                    if (string.IsNullOrWhiteSpace(item.Id))
+                    {
+                        item.Id = Guid.NewGuid().ToString("N");
+                    }
+                    var existingIdx = _ads.FindIndex(a => a.Id == item.Id);
+                    if (existingIdx >= 0)
+                    {
+                        _ads[existingIdx] = item;
+                    }
+                    else
+                    {
+                        _ads.Add(item);
+                    }
+                }
+            }
+            return items.Count;
+        }
+        catch
+        {
+            return 0;
+        }
+    }
+
+    public async Task<int> RefreshAdsFromFeedAsync(string feedUrl, CancellationToken cancellationToken = default)
+    {
+        if (string.IsNullOrWhiteSpace(feedUrl) || !Uri.TryCreate(feedUrl, UriKind.Absolute, out var uri) ||
+            (uri.Scheme != Uri.UriSchemeHttp && uri.Scheme != Uri.UriSchemeHttps))
+        {
+            return 0;
+        }
+
+        try
+        {
+            var response = await HttpClient.GetStringAsync(uri, cancellationToken).ConfigureAwait(false);
+            return LoadAdsFromJson(response);
+        }
+        catch
+        {
+            return 0;
+        }
+    }
+
+    public bool OpenAdUrl(AdItem ad)
+    {
+        if (ad == null || string.IsNullOrWhiteSpace(ad.TargetUrl))
+        {
+            return false;
+        }
+
+        if (!Uri.TryCreate(ad.TargetUrl, UriKind.Absolute, out var uri))
+        {
+            return false;
+        }
+
+        if (uri.Scheme != Uri.UriSchemeHttp && uri.Scheme != Uri.UriSchemeHttps)
+        {
+            return false;
+        }
+
+        try
+        {
+            var psi = new ProcessStartInfo
+            {
+                FileName = uri.AbsoluteUri,
+                UseShellExecute = true
+            };
+            Process.Start(psi);
+            return true;
+        }
+        catch
+        {
+            return false;
+        }
+    }
+}
diff --git a/src/Everything2Everything.Core/Ads/IAdService.cs b/src/Everything2Everything.Core/Ads/IAdService.cs
new file mode 100644
index 0000000..dead09e
--- /dev/null
+++ b/src/Everything2Everything.Core/Ads/IAdService.cs
@@ -0,0 +1,16 @@
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Everything2Everything.Core.Ads;
+
+public interface IAdService
+{
+    IReadOnlyList<AdItem> GetBannerAds();
+    IReadOnlyList<AdItem> GetLargeCardAds();
+    AdItem? GetNextBannerAd();
+    AdItem? GetNextLargeCardAd();
+    Task<int> RefreshAdsFromFeedAsync(string feedUrl, CancellationToken cancellationToken = default);
+    int LoadAdsFromJson(string json);
+    bool OpenAdUrl(AdItem ad);
+}
diff --git a/src/Everything2Everything.Core/Converters/ChatClients.cs b/src/Everything2Everything.Core/Converters/ChatClients.cs
index b751beb..4608ff5 100644
--- a/src/Everything2Everything.Core/Converters/ChatClients.cs
+++ b/src/Everything2Everything.Core/Converters/ChatClients.cs
@@ -137,3 +137,108 @@ public sealed class CodexChatClient : IChatClient
 
     private static string Truncate(string s) => s.Length > 400 ? s[..400] : s;
 }
+
+public sealed class AgyChatClient : IChatClient
+{
+    private readonly string _agyPath;
+
+    public AgyChatClient(string? agyPath = null)
+    {
+        if (!string.IsNullOrWhiteSpace(agyPath))
+        {
+            _agyPath = agyPath;
+        }
+        else if (ExternalToolDetector.IsAgyAvailable(out var detected))
+        {
+            _agyPath = detected;
+        }
+        else
+        {
+            _agyPath = "agy";
+        }
+    }
+
+    public string Name => "Antigravity CLI (agy)";
+
+    public async Task<string> CompleteAsync(string systemPrompt, string userPrompt, string model, int maxTokens, CancellationToken ct)
+    {
+        var prompt = string.IsNullOrWhiteSpace(systemPrompt) ? userPrompt : systemPrompt + "\n\n---\n\n" + userPrompt;
+
+        var args = new List<string>
+        {
+            "-p", prompt,
+            "--dangerously-skip-permissions",
+            "--disable-slash-commands",
+            "--output-format", "text"
+        };
+        if (!string.IsNullOrWhiteSpace(model))
+        {
+            args.Add("--model");
+            args.Add(model);
+        }
+
+        var r = await ExternalProcessRunner.RunAsync(
+            _agyPath, args, TimeSpan.FromMinutes(5), workingDirectory: null,
+            cancellationToken: ct).ConfigureAwait(false);
+
+        if (r.TimedOut)
+            throw new InvalidOperationException("Antigravity CLI 응답이 시간 초과되었습니다 (5분).");
+
+        if (!r.Success)
+        {
+            var detail = !string.IsNullOrWhiteSpace(r.StdErr) ? r.StdErr : r.StdOut;
+            throw new InvalidOperationException($"Antigravity CLI 오류 (exit {r.ExitCode}): {Truncate(detail)}");
+        }
+
+        return r.StdOut.Trim();
+    }
+
+    private static string Truncate(string s) => s.Length > 400 ? s[..400] : s;
+}
+
+/// <summary>
+/// 로컬 또는 네트워크에 기동된 Switchboard Gateway (http://127.0.0.1:8787)를 호출하는 백엔드.
+/// 게이트웨이의 /chat 엔드포인트와 통신하며, 게이트웨이가 관리하는 에이전트(agy, codex 등)를 통해 텍스트를 완성한다.
+/// </summary>
+public sealed class SwitchboardChatClient : IChatClient
+{
+    private static readonly HttpClient Http = new() { Timeout = TimeSpan.FromMinutes(5) };
+    private readonly string _endpoint;
+
+    public SwitchboardChatClient(string? endpoint = null)
+    {
+        var raw = string.IsNullOrWhiteSpace(endpoint) ? "http://127.0.0.1:8787" : endpoint.Trim();
+        _endpoint = raw.TrimEnd('/');
+    }
+
+    public string Name => "Switchboard Gateway";
+    public string Endpoint => _endpoint;
+
+    public async Task<string> CompleteAsync(string systemPrompt, string userPrompt, string model, int maxTokens, CancellationToken ct)
+    {
+        var message = string.IsNullOrWhiteSpace(systemPrompt) ? userPrompt : systemPrompt + "\n\n---\n\n" + userPrompt;
+        var payload = new
+        {
+            message,
+            sessionId = "e2e-" + Guid.NewGuid().ToString("N")[..8],
+            model = string.IsNullOrWhiteSpace(model) ? null : model,
+        };
+
+        using var req = new HttpRequestMessage(HttpMethod.Post, $"{_endpoint}/chat");
+        req.Content = new StringContent(JsonSerializer.Serialize(payload), Encoding.UTF8, "application/json");
+
+        using var resp = await Http.SendAsync(req, ct).ConfigureAwait(false);
+        var json = await resp.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
+        if (!resp.IsSuccessStatusCode)
+            throw new InvalidOperationException($"Switchboard 게이트웨이 오류 ({(int)resp.StatusCode}): {Truncate(json)}");
+
+        using var doc = JsonDocument.Parse(json);
+        if (doc.RootElement.TryGetProperty("reply", out var replyProp))
+            return replyProp.GetString() ?? "";
+
+        throw new InvalidOperationException("Switchboard 게이트웨이 응답에 'reply' 필드가 없습니다.");
+    }
+
+    private static string Truncate(string s) => s.Length > 400 ? s[..400] : s;
+}
+
diff --git a/src/Everything2Everything.Core/Converters/ExternalToolCatalog.cs b/src/Everything2Everything.Core/Converters/ExternalToolCatalog.cs
new file mode 100644
index 0000000..06af23d
--- /dev/null
+++ b/src/Everything2Everything.Core/Converters/ExternalToolCatalog.cs
@@ -0,0 +1,99 @@
+namespace Everything2Everything.Core.Converters;
+
+/// <summary>설치 방식 분류. Winget = 자동 설치 가능, Manual = 사용자 안내만(라이선스/URL 제약).</summary>
+public enum ExternalToolInstallKind
+{
+    Winget,
+    Manual,
+}
+
+/// <summary>첫 실행 설치 마법사가 다루는 외부 도구 한 항목의 정의. 감지 함수는 설치 여부 판정을 담당한다.</summary>
+public sealed class ExternalToolDefinition
+{
+    public required string Key { get; init; }
+    public required string DisplayName { get; init; }
+    public required string Description { get; init; }
+    public required ExternalToolInstallKind Kind { get; init; }
+    public string? WingetId { get; init; }
+    public string? ManualNote { get; init; }
+    public required Func<bool> IsInstalled { get; init; }
+}
+
+/// <summary>
+/// 앱이 의존하는 외부 도구의 정적 카탈로그. winget 패키지 ID는 기기에서 실검증된 값이다.
+/// (Gyan.FFmpeg / TheDocumentFoundation.LibreOffice / JohnMacFarlane.Pandoc /
+///  ImageMagick.ImageMagick / Google.AntigravityCLI / OpenAI.Codex)
+/// H2Orestart는 GPL이고 프로젝트 원칙(번들 금지·외부 조달)상 자동 설치하지 않고 안내만 한다.
+/// </summary>
+public static class ExternalToolCatalog
+{
+    public static IReadOnlyList<ExternalToolDefinition> All { get; } = new[]
+    {
+        new ExternalToolDefinition
+        {
+            Key = "ffmpeg",
+            DisplayName = "FFmpeg",
+            Description = "영상/오디오 변환 (mp4·webm·mp3·flac…). ffmpeg·ffprobe 포함.",
+            Kind = ExternalToolInstallKind.Winget,
+            WingetId = "Gyan.FFmpeg",
+            IsInstalled = () => ExternalToolDetector.TryFindFfmpeg(out _),
+        },
+        new ExternalToolDefinition
+        {
+            Key = "libreoffice",
+            DisplayName = "LibreOffice",
+            Description = "한글/Word/문서 변환 (DOCX→PDF·이미지).",
+            Kind = ExternalToolInstallKind.Winget,
+            WingetId = "TheDocumentFoundation.LibreOffice",
+            IsInstalled = () => ExternalToolDetector.TryFindLibreOfficeSoffice(out _),
+        },
+        new ExternalToolDefinition
+        {
+            Key = "pandoc",
+            DisplayName = "Pandoc",
+            Description = "마크업 변환 (md·rst·latex·epub…).",
+            Kind = ExternalToolInstallKind.Winget,
+            WingetId = "JohnMacFarlane.Pandoc",
+            IsInstalled = () => ExternalToolDetector.TryFindPandoc(out _),
+        },
+        new ExternalToolDefinition
+        {
+            Key = "imagemagick",
+            DisplayName = "ImageMagick",
+            Description = "HEIC 등 이미지 처리 변환.",
+            Kind = ExternalToolInstallKind.Winget,
+            WingetId = "ImageMagick.ImageMagick",
+            IsInstalled = () => ExternalToolDetector.TryFindMagick(out _),
+        },
+        new ExternalToolDefinition
+        {
+            Key = "h2orestart",
+            DisplayName = "H2Orestart (한글 확장)",
+            Description = "LibreOffice에서 .hwp/.hwpx 열기용 UNO 확장.",
+            Kind = ExternalToolInstallKind.Manual,
+            ManualNote = "LibreOffice 설치 후 확장 관리자(Tools → Extension Manager)에서 H2Orestart.oxt를 직접 추가하세요.",
+            IsInstalled = () => ExternalToolDetector.IsH2OrestartInstalled(),
+        },
+        new ExternalToolDefinition
+        {
+            Key = "agy",
+            DisplayName = "Antigravity CLI (agy)",
+            Description = "AI 변환 백엔드 (Google OAuth · API 키 불필요).",
+            Kind = ExternalToolInstallKind.Winget,
+            WingetId = "Google.AntigravityCLI",
+            IsInstalled = () => ExternalToolDetector.IsAgyAvailable(out _),
+        },
+        new ExternalToolDefinition
+        {
+            Key = "codex",
+            DisplayName = "Codex CLI",
+            Description = "AI 변환 백엔드 (ChatGPT 구독 OAuth).",
+            Kind = ExternalToolInstallKind.Winget,
+            WingetId = "OpenAI.Codex",
+            IsInstalled = () => ExternalToolDetector.IsCodexAvailable(),
+        },
+    };
+
+    public static ExternalToolDefinition? Find(string key)
+        => All.FirstOrDefault(t => string.Equals(t.Key, key, StringComparison.OrdinalIgnoreCase));
+}
\ No newline at end of file
diff --git a/src/Everything2Everything.Core/Converters/ExternalToolDetector.cs b/src/Everything2Everything.Core/Converters/ExternalToolDetector.cs
index cfe24bd..6c8dbf4 100644
--- a/src/Everything2Everything.Core/Converters/ExternalToolDetector.cs
+++ b/src/Everything2Everything.Core/Converters/ExternalToolDetector.cs
@@ -67,6 +67,22 @@ public static class ExternalToolDetector
             if (!string.IsNullOrWhiteSpace(dir))
                 candidates.Add(dir.Trim());
 
+        // winget(Gyan.FFmpeg)은 zip 해제본을 %LOCALAPPDATA%\Microsoft\WinGet\Packages\Gyan.FFmpeg*\ffmpeg-*\bin에 둔다.
+        // PATH에 없으므로 설치 후에도 감지되도록 패키지 폴더를 직접 스캔한다.
+        var winGetPackages = Path.Combine(local, "Microsoft", "WinGet", "Packages");
+        try
+        {
+            if (Directory.Exists(winGetPackages))
+            {
+                foreach (var pkgDir in Directory.EnumerateDirectories(winGetPackages, "Gyan.FFmpeg*"))
+                {
+                    foreach (var bin in Directory.EnumerateDirectories(pkgDir, "bin", SearchOption.AllDirectories))
+                        candidates.Add(bin);
+                }
+            }
+        }
+        catch { /* WinGet 패키지 디렉터리 스캔 실패 무시 */ }
+
         foreach (var dir in candidates.Distinct())
         {
             try
@@ -82,6 +98,78 @@ public static class ExternalToolDetector
         return false;
     }
 
+    /// <summary>
+    /// Pandoc 바이너리를 찾는다. (1) %LOCALAPPDATA%\Pandoc (winget 기본 설치 위치),
+    /// (2) WinGet Links, (3) 시스템 PATH 순.
+    /// </summary>
+    public static bool TryFindPandoc(out string pandocPath)
+    {
+        pandocPath = "";
+        var candidates = new List<string>();
+
+        var local = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        if (!string.IsNullOrEmpty(local))
+        {
+            candidates.Add(Path.Combine(local, "Pandoc", "pandoc.exe"));
+            candidates.Add(Path.Combine(local, "Microsoft", "WinGet", "Links", "pandoc.exe"));
+        }
+
+        var pathEnv = Environment.GetEnvironmentVariable("PATH") ?? "";
+        foreach (var dir in pathEnv.Split(Path.PathSeparator))
+            if (!string.IsNullOrWhiteSpace(dir))
+                candidates.Add(Path.Combine(dir.Trim(), "pandoc.exe"));
+
+        foreach (var p in candidates.Distinct())
+        {
+            try
+            {
+                if (File.Exists(p)) { pandocPath = p; return true; }
+            }
+            catch { /* 잘못된 경로 무시 */ }
+        }
+        return false;
+    }
+
+    /// <summary>
+    /// ImageMagick(magick.exe) 바이너리를 찾는다. (1) %ProgramFiles%/ProgramFiles(x86) 아래
+    /// ImageMagick-* 폴더, (2) 실제 PATH 순.
+    /// </summary>
+    public static bool TryFindMagick(out string magickPath)
+    {
+        magickPath = "";
+        var candidates = new List<string>();
+
+        foreach (var root in new[]
+                 {
+                     Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles),
+                     Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86),
+                 })
+        {
+            if (string.IsNullOrEmpty(root)) continue;
+            try
+            {
+                foreach (var dir in Directory.EnumerateDirectories(root, "ImageMagick-*"))
+                    candidates.Add(Path.Combine(dir, "magick.exe"));
+            }
+            catch { /* 디렉터리 열람 실패 무시 */ }
+        }
+
+        var pathEnv = Environment.GetEnvironmentVariable("PATH") ?? "";
+        foreach (var dir in pathEnv.Split(Path.PathSeparator))
+            if (!string.IsNullOrWhiteSpace(dir))
+                candidates.Add(Path.Combine(dir.Trim(), "magick.exe"));
+
+        foreach (var p in candidates.Distinct())
+        {
+            try
+            {
+                if (File.Exists(p)) { magickPath = p; return true; }
+            }
+            catch { /* 잘못된 경로 무시 */ }
+        }
+        return false;
+    }
+
     /// <summary>
     /// codex CLI(OpenAI Codex, ChatGPT 구독 OAuth 재사용) 설치 여부. npm 글로벌 + PATH에서
     /// codex.cmd/codex.exe/codex.ps1을 탐지한다.
@@ -110,6 +198,38 @@ public static class ExternalToolDetector
         return false;
     }
 
+    /// <summary>
+    /// Antigravity CLI (agy, Google 개인 OAuth 재사용) 설치 여부. WinGet Links 및 PATH에서 agy.exe를 탐지한다.
+    /// </summary>
+    public static bool IsAgyAvailable(out string agyPath)
+    {
+        agyPath = "";
+        var candidates = new List<string>();
+
+        var local = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        if (!string.IsNullOrEmpty(local))
+            candidates.Add(Path.Combine(local, "Microsoft", "WinGet", "Links", "agy.exe"));
+
+        var pathEnv = Environment.GetEnvironmentVariable("PATH") ?? "";
+        foreach (var d in pathEnv.Split(Path.PathSeparator))
+            if (!string.IsNullOrWhiteSpace(d))
+                candidates.Add(Path.Combine(d.Trim(), "agy.exe"));
+
+        foreach (var p in candidates.Distinct())
+        {
+            try
+            {
+                if (File.Exists(p))
+                {
+                    agyPath = p;
+                    return true;
+                }
+            }
+            catch { /* 잘못된 경로 무시 */ }
+        }
+        return false;
+    }
+
     public static bool IsH2OrestartInstalled()
     {
         try
@@ -143,4 +263,56 @@ public static class ExternalToolDetector
         catch { }
         return false;
     }
+
+    /// <summary>
+    /// 로컬 루프백 또는 지정된 LAN의 Switchboard Gateway 청취 여부를 100ms 이내에 신속히 감지한다.
+    /// </summary>
+    public static bool IsSwitchboardGatewayAvailable(out string endpoint, string? configuredEndpoint = null)
+    {
+        endpoint = string.IsNullOrWhiteSpace(configuredEndpoint) ? "http://127.0.0.1:8787" : configuredEndpoint.Trim().TrimEnd('/');
+        try
+        {
+            var uri = new Uri(endpoint);
+            using var tcp = new System.Net.Sockets.TcpClient();
+            var host = uri.Host;
+            var port = uri.Port > 0 ? uri.Port : 8787;
+            var result = tcp.BeginConnect(host, port, null, null);
+            var success = result.AsyncWaitHandle.WaitOne(TimeSpan.FromMilliseconds(100));
+            if (!success || !tcp.Connected) return false;
+            tcp.EndConnect(result);
+            return true;
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
+    /// <summary>
+    /// Switchboard Gateway (기본 http://127.0.0.1:8787) 헬스체크 및 에이전트 프로필을 비동기로 정밀 검증한다.
+    /// </summary>
+    public static async Task<(bool available, string? agentProfile, string endpoint)> CheckSwitchboardGatewayHealthAsync(
+        string? endpoint = null, CancellationToken ct = default)
+    {
+        var ep = string.IsNullOrWhiteSpace(endpoint) ? "http://127.0.0.1:8787" : endpoint.Trim().TrimEnd('/');
+        try
+        {
+            using var cts = CancellationTokenSource.CreateLinkedTokenSource(ct);
+            cts.CancelAfter(TimeSpan.FromMilliseconds(1500));
+            using var client = new System.Net.Http.HttpClient { Timeout = TimeSpan.FromMilliseconds(1500) };
+            using var resp = await client.GetAsync($"{ep}/health", cts.Token).ConfigureAwait(false);
+            if (!resp.IsSuccessStatusCode) return (false, null, ep);
+            var json = await resp.Content.ReadAsStringAsync(cts.Token).ConfigureAwait(false);
+            using var doc = System.Text.Json.JsonDocument.Parse(json);
+            var root = doc.RootElement;
+            var ok = root.TryGetProperty("ok", out var okProp) && okProp.GetBoolean();
+            var profile = root.TryGetProperty("agentProfile", out var pProp) ? pProp.GetString() : null;
+            return (ok, profile, ep);
+        }
+        catch
+        {
+            return (false, null, ep);
+        }
+    }
 }
+
diff --git a/src/Everything2Everything.Core/Converters/ExternalToolInstaller.cs b/src/Everything2Everything.Core/Converters/ExternalToolInstaller.cs
new file mode 100644
index 0000000..81be662
--- /dev/null
+++ b/src/Everything2Everything.Core/Converters/ExternalToolInstaller.cs
@@ -0,0 +1,142 @@
+using System.Diagnostics;
+using System.Text;
+
+namespace Everything2Everything.Core.Converters;
+
+/// <summary>외부 명령 한 번을 실행하는 시드. 프로세스 실행을 추상화해 설치 로직을 단위 테스트 가능하게 한다.</summary>
+public interface IExternalCommandRunner
+{
+    Task<ExternalCommandResult> RunAsync(string fileName, string arguments, string? workingDirectory, CancellationToken ct);
+}
+
+public sealed record ExternalCommandResult(int ExitCode, string Output);
+
+/// <summary>System.Diagnostics.Process 기반 기본 구현. 숨김 실행 + 출력(꼬리) 캡처 + 취소 시 Kill.</summary>
+public sealed class SystemCommandRunner : IExternalCommandRunner
+{
+    public async Task<ExternalCommandResult> RunAsync(string fileName, string arguments, string? workingDirectory, CancellationToken ct)
+    {
+        var psi = new ProcessStartInfo
+        {
+            FileName = fileName,
+            Arguments = arguments,
+            UseShellExecute = false,
+            CreateNoWindow = true,
+            RedirectStandardOutput = true,
+            RedirectStandardError = true,
+            WorkingDirectory = workingDirectory ?? Environment.GetFolderPath(Environment.SpecialFolder.UserProfile),
+        };
+
+        using var proc = new Process { StartInfo = psi };
+        var outTail = new StringBuilder();
+        var errTail = new StringBuilder();
+        proc.OutputDataReceived += (_, e) => { if (e.Data is not null) AppendCapped(outTail, e.Data); };
+        proc.ErrorDataReceived += (_, e) => { if (e.Data is not null) AppendCapped(errTail, e.Data); };
+
+        proc.Start();
+        proc.BeginOutputReadLine();
+        proc.BeginErrorReadLine();
+
+        try
+        {
+            await proc.WaitForExitAsync(ct);
+        }
+        catch (OperationCanceledException)
+        {
+            Kill(proc);
+            return new ExternalCommandResult(-1, "취소됨");
+        }
+
+        var joined = (outTail + "\n" + errTail).Trim();
+        return new ExternalCommandResult(proc.ExitCode, joined);
+    }
+
+    private static void Kill(Process proc)
+    {
+        try { proc.Kill(entireProcessTree: true); }
+        catch { }
+        try { proc.WaitForExit(); } catch { }
+    }
+
+    /// <summary>출력이 폭주하지 않도록 꼬리 일부만 유지한다.</summary>
+    private static void AppendCapped(StringBuilder sb, string line, int max = 4000)
+    {
+        lock (sb)
+        {
+            if (sb.Length > max * 3) return;
+            sb.AppendLine(line);
+            if (sb.Length > max)
+            {
+                var keep = sb.ToString(sb.Length - max, max);
+                sb.Clear();
+                sb.Append('…');
+                sb.Append(keep);
+            }
+        }
+    }
+}
+
+public sealed record ExternalToolInstallResult(bool Success, int ExitCode, string Output, string? Message);
+
+/// <summary>
+/// 외부 도구 설치 실행기. Winget 도구는 winget 무인 설치 명령을 만들고 실행한 뒤,
+/// 설치 여부를 다시 감지(IsInstalled)해 실제 성공 여부를 판정한다.
+/// Manual(수동) 도구는 실행하지 않고 안내 문구만 돌려준다.
+/// </summary>
+public sealed class ExternalToolInstaller
+{
+    private readonly IExternalCommandRunner _runner;
+
+    public ExternalToolInstaller(IExternalCommandRunner? runner = null)
+        => _runner = runner ?? new SystemCommandRunner();
+
+    public static bool IsWingetAvailable()
+    {
+        try
+        {
+            var psi = new ProcessStartInfo("winget", "--version")
+            {
+                UseShellExecute = false,
+                CreateNoWindow = true,
+                RedirectStandardOutput = true,
+                RedirectStandardError = true,
+            };
+            using var p = Process.Start(psi);
+            if (p is null) return false;
+            if (!p.WaitForExit(3000)) { try { p.Kill(); } catch { } return false; }
+            return p.ExitCode == 0;
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
+    public async Task<ExternalToolInstallResult> InstallAsync(ExternalToolDefinition tool, CancellationToken ct)
+    {
+        // 수동 도구(H2Orestart 등)는 자동 설치를 시도하지 않고 안내문을 돌려준다.
+        if (tool.Kind != ExternalToolInstallKind.Winget || string.IsNullOrWhiteSpace(tool.WingetId))
+            return new ExternalToolInstallResult(tool.IsInstalled(), 0, "", tool.ManualNote);
+
+        var args = $"install --id {tool.WingetId} -e --source winget --silent " +
+                   "--accept-package-agreements --accept-source-agreements --disable-interactivity";
+
+        ExternalCommandResult result;
+        try
+        {
+            result = await _runner.RunAsync("winget", args, null, ct).ConfigureAwait(false);
+        }
+        catch (Exception ex)
+        {
+            return new ExternalToolInstallResult(false, -1, ex.Message, "winget 실행 실패 — 설치할 수 없습니다.");
+        }
+
+        // 성공 판정은 exit code가 아니라 '설치 후 실제 감지'로 한다(앱 입장의 실질 기준).
+        var installed = tool.IsInstalled();
+        return new ExternalToolInstallResult(
+            installed,
+            result.ExitCode,
+            result.Output,
+            installed ? null : $"설치 실패 또는 아직 감지 안 됨 (코드 {result.ExitCode})");
+    }
+}
diff --git a/src/Everything2Everything.Core/Converters/LlmProvider.cs b/src/Everything2Everything.Core/Converters/LlmProvider.cs
index e95b351..da5627e 100644
--- a/src/Everything2Everything.Core/Converters/LlmProvider.cs
+++ b/src/Everything2Everything.Core/Converters/LlmProvider.cs
@@ -96,16 +96,28 @@ public sealed class LlmProvider : IConverterProvider
             return openaiKey is null ? (null, "") : (new OpenAiChatClient(openaiKey), ai.Model ?? "gpt-4o-mini");
         if (backend == "anthropic")
             return anthropicKey is null ? (null, "") : (new AnthropicChatClient(anthropicKey), ai.Model ?? "claude-3-5-sonnet-latest");
+        if (backend == "agy")
+            return ExternalToolDetector.IsAgyAvailable(out var agyPath) ? (new AgyChatClient(agyPath), ai.Model ?? "") : (null, "");
+        if (backend == "switchboard" || backend == "gateway")
+        {
+            var ep = _settings.Get("switchboard.endpoint");
+            return (new SwitchboardChatClient(ep), ai.Model ?? "");
+        }
         if (backend == "codex")
             return ExternalToolDetector.IsCodexAvailable() ? (new CodexChatClient(), ai.Model ?? "") : (null, "");
 
-        // auto: API 키 우선, 없으면 Codex CLI(ChatGPT 구독 OAuth)
+        // auto: API 키 우선, 없으면 Antigravity CLI(Gemini OAuth) 또는 Switchboard Gateway 또는 Codex CLI(ChatGPT 구독 OAuth)
         if (openaiKey is not null) return (new OpenAiChatClient(openaiKey), ai.Model ?? "gpt-4o-mini");
         if (anthropicKey is not null) return (new AnthropicChatClient(anthropicKey), ai.Model ?? "claude-3-5-sonnet-latest");
+        if (ExternalToolDetector.IsAgyAvailable(out var defaultAgyPath)) return (new AgyChatClient(defaultAgyPath), ai.Model ?? "");
+        var sbEp = _settings.Get("switchboard.endpoint");
+        if (ExternalToolDetector.IsSwitchboardGatewayAvailable(out var defaultEp, sbEp)) return (new SwitchboardChatClient(defaultEp), ai.Model ?? "");
         if (ExternalToolDetector.IsCodexAvailable()) return (new CodexChatClient(), ai.Model ?? "");
         return (null, "");
     }
 
+    internal (IChatClient? client, string model) ResolveClientForTesting(AiOptions ai) => ResolveClient(ai);
+
     private string? GetKey(string provider)
     {
         var stored = _settings.Get($"{provider}.apikey");
diff --git a/src/Everything2Everything.Core/ServiceCollectionExtensions.cs b/src/Everything2Everything.Core/ServiceCollectionExtensions.cs
index f5b60f8..401038e 100644
--- a/src/Everything2Everything.Core/ServiceCollectionExtensions.cs
+++ b/src/Everything2Everything.Core/ServiceCollectionExtensions.cs
@@ -22,6 +22,8 @@ public static class ServiceCollectionExtensions
         else
             services.TryAddSingleton<ISettingsStore, DpapiSettingsStore>();
 
+        services.TryAddSingleton<Everything2Everything.Core.Ads.IAdService, Everything2Everything.Core.Ads.AdService>();
+
         // IConverterProvider 구현 전수 자동 등록. AsSelfWithInterfaces =
         // 구체 타입을 단일 싱글턴으로 등록 + IConverterProvider는 그 인스턴스로 포워드한다.
         // → Heic(MagickProvider)/Docx·Ocr·Hwpx(PdfProvider)/Llm(ISettingsStore) 생성자 의존이
diff --git a/src/Everything2Everything.Tests/AdDesignAuditTests.cs b/src/Everything2Everything.Tests/AdDesignAuditTests.cs
new file mode 100644
index 0000000..1cca51a
--- /dev/null
+++ b/src/Everything2Everything.Tests/AdDesignAuditTests.cs
@@ -0,0 +1,105 @@
+using System.IO;
+using System.Linq;
+using System.Xml.Linq;
+using Xunit;
+
+namespace Everything2Everything.Tests;
+
+public class AdDesignAuditTests
+{
+    private static readonly string SolutionRoot = FindSolutionRoot();
+    private static readonly string ViewsDir = Path.Combine(SolutionRoot, "src", "Everything2Everything.App", "Views");
+
+    private static string FindSolutionRoot()
+    {
+        var dir = Directory.GetCurrentDirectory();
+        while (dir != null && !File.Exists(Path.Combine(dir, "Everything2Everything.slnx")))
+        {
+            dir = Directory.GetParent(dir)?.FullName;
+        }
+        return dir ?? throw new DirectoryNotFoundException("솔루션 루트를 찾을 수 없습니다.");
+    }
+
+    [Fact]
+    public void AdControls_MustExistAndBeWellFormed()
+    {
+        var bannerPath = Path.Combine(ViewsDir, "AdBannerControl.xaml");
+        var largeCardPath = Path.Combine(ViewsDir, "AdLargeCardControl.xaml");
+
+        Assert.True(File.Exists(bannerPath), "AdBannerControl.xaml 이 존재해야 합니다.");
+        Assert.True(File.Exists(largeCardPath), "AdLargeCardControl.xaml 이 존재해야 합니다.");
+
+        var bannerDoc = XDocument.Parse(File.ReadAllText(bannerPath));
+        var largeCardDoc = XDocument.Parse(File.ReadAllText(largeCardPath));
+
+        Assert.NotNull(bannerDoc.Root);
+        Assert.NotNull(largeCardDoc.Root);
+    }
+
+    [Fact]
+    public void AdControls_MustComplyWithStrictDesignAudit()
+    {
+        var targetFiles = new[]
+        {
+            Path.Combine(ViewsDir, "AdBannerControl.xaml"),
+            Path.Combine(ViewsDir, "AdLargeCardControl.xaml")
+        };
+
+        var rawEmojis = new[] { "⚙", "📁", "🗑", "✖", "🔧", "✨", "🚀", "⚡" };
+        var violations = new List<string>();
+
+        foreach (var file in targetFiles)
+        {
+            if (!File.Exists(file)) continue;
+
+            var doc = XDocument.Parse(File.ReadAllText(file));
+            var fileName = Path.GetFileName(file);
+
+            // 1. 유니코드 이모지 금지 검증
+            var buttons = doc.Descendants().Where(e => e.Name.LocalName is "Button" or "ToggleButton");
+            foreach (var btn in buttons)
+            {
+                var content = btn.Attribute("Content")?.Value;
+                if (!string.IsNullOrEmpty(content) && rawEmojis.Any(emoji => content.Contains(emoji)))
+                {
+                    violations.Add($"[{fileName}] 버튼에 이모지 사용 감지: {content}");
+                }
+            }
+
+            // 2. 가로 StackPanel 내 아이콘/텍스트 VerticalAlignment="Center" 검증
+            var stackPanels = doc.Descendants().Where(e => e.Name.LocalName == "StackPanel" &&
+                                                           e.Attribute("Orientation")?.Value == "Horizontal");
+            foreach (var sp in stackPanels)
+            {
+                foreach (var child in sp.Elements())
+                {
+                    var va = child.Attribute("VerticalAlignment")?.Value;
+                    if (va != "Center")
+                    {
+                        violations.Add($"[{fileName}] 가로 StackPanel의 자식 <{child.Name.LocalName}>에 VerticalAlignment=\"Center\" 누락");
+                    }
+                }
+            }
+
+            // 3. TextBlock 오버플로 방지 (TextTrimming 또는 TextWrapping) 검증
+            var textBlocks = doc.Descendants().Where(e => e.Name.LocalName == "TextBlock");
+            foreach (var tb in textBlocks)
+            {
+                var text = tb.Attribute("Text")?.Value ?? "";
+                // 바인딩된 동적 텍스트는 Trimming이나 Wrapping 필수
+                if (text.Contains("{Binding") || text.Contains("{x:Bind"))
+                {
+                    var trimming = tb.Attribute("TextTrimming")?.Value;
+                    var wrapping = tb.Attribute("TextWrapping")?.Value;
+                    if (string.IsNullOrEmpty(trimming) && string.IsNullOrEmpty(wrapping))
+                    {
+                        violations.Add($"[{fileName}] 바인딩 TextBlock에 TextTrimming 또는 TextWrapping 누락: {text}");
+                    }
+                }
+            }
+        }
+
+        Assert.True(violations.Count == 0,
+            "광고 컨트롤 디자인 감사 위반이 발견되었습니다:\n" + string.Join("\n", violations));
+    }
+}
diff --git a/src/Everything2Everything.Tests/AdMobConfigTests.cs b/src/Everything2Everything.Tests/AdMobConfigTests.cs
new file mode 100644
index 0000000..daf6eb2
--- /dev/null
+++ b/src/Everything2Everything.Tests/AdMobConfigTests.cs
@@ -0,0 +1,30 @@
+using Everything2Everything.Core.Ads;
+using Xunit;
+
+namespace Everything2Everything.Tests;
+
+public class AdMobConfigTests
+{
+    [Fact]
+    public void AdMobConfig_DefaultState_IsValid()
+    {
+        var config = new AdMobConfig();
+
+        Assert.NotNull(config.AppId);
+        Assert.NotNull(config.BannerAdUnitId);
+        Assert.NotNull(config.InterstitialAdUnitId);
+    }
+
+    [Fact]
+    public void GenerateAppAdsTxt_ReturnsValidGoogleSpecification()
+    {
+        var config = new AdMobConfig
+        {
+            PublisherId = "pub-1234567890123456"
+        };
+
+        string appAdsTxt = config.GenerateAppAdsTxt();
+
+        Assert.Contains("google.com, pub-1234567890123456, DIRECT, f08c47fec0942fa0", appAdsTxt);
+    }
+}
diff --git a/src/Everything2Everything.Tests/AdServiceTests.cs b/src/Everything2Everything.Tests/AdServiceTests.cs
new file mode 100644
index 0000000..05118b2
--- /dev/null
+++ b/src/Everything2Everything.Tests/AdServiceTests.cs
@@ -0,0 +1,115 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Everything2Everything.Core.Ads;
+using Xunit;
+
+namespace Everything2Everything.Tests;
+
+public class AdServiceTests
+{
+    [Fact]
+    public void GetBannerAds_ReturnsDefaultHouseAds_NotEmpty()
+    {
+        var service = new AdService();
+        var bannerAds = service.GetBannerAds();
+
+        Assert.NotNull(bannerAds);
+        Assert.NotEmpty(bannerAds);
+        Assert.All(bannerAds, ad =>
+        {
+            Assert.Equal(AdType.Banner, ad.Type);
+            Assert.False(string.IsNullOrWhiteSpace(ad.Title));
+            Assert.False(string.IsNullOrWhiteSpace(ad.Description));
+            Assert.False(string.IsNullOrWhiteSpace(ad.TargetUrl));
+        });
+    }
+
+    [Fact]
+    public void GetLargeCardAds_ReturnsDefaultLargeCardAds_NotEmpty()
+    {
+        var service = new AdService();
+        var largeAds = service.GetLargeCardAds();
+
+        Assert.NotNull(largeAds);
+        Assert.NotEmpty(largeAds);
+        Assert.All(largeAds, ad =>
+        {
+            Assert.Equal(AdType.LargeCard, ad.Type);
+            Assert.False(string.IsNullOrWhiteSpace(ad.Title));
+            Assert.False(string.IsNullOrWhiteSpace(ad.Description));
+            Assert.False(string.IsNullOrWhiteSpace(ad.TargetUrl));
+        });
+    }
+
+    [Fact]
+    public void GetNextBannerAd_RotatesThroughAds()
+    {
+        var service = new AdService();
+        var banners = service.GetBannerAds();
+
+        if (banners.Count > 1)
+        {
+            var first = service.GetNextBannerAd();
+            var second = service.GetNextBannerAd();
+
+            Assert.NotNull(first);
+            Assert.NotNull(second);
+            Assert.NotEqual(first.Id, second.Id);
+        }
+        else
+        {
+            var ad = service.GetNextBannerAd();
+            Assert.NotNull(ad);
+        }
+    }
+
+    [Fact]
+    public void OpenAdUrl_InvalidOrEmptyUrl_ReturnsFalse()
+    {
+        var service = new AdService();
+
+        Assert.False(service.OpenAdUrl(new AdItem { TargetUrl = "" }));
+        Assert.False(service.OpenAdUrl(new AdItem { TargetUrl = "javascript:alert(1)" }));
+        Assert.False(service.OpenAdUrl(new AdItem { TargetUrl = "not-a-valid-url" }));
+    }
+
+    [Fact]
+    public void LoadAdsFromJson_ValidJson_PopulatesCustomAds()
+    {
+        var service = new AdService();
+        string json = @"[
+            {
+                ""Id"": ""test-banner-1"",
+                ""Title"": ""커스텀 파트너스 배너"",
+                ""Description"": ""안전하고 빠른 클라우드 스토리지"",
+                ""BadgeText"": ""스폰서"",
+                ""ImageUrl"": ""https://example.com/banner.png"",
+                ""TargetUrl"": ""https://example.com/promo"",
+                ""CtaText"": ""지금 확인"",
+                ""Type"": 0,
+                ""IsActive"": true
+            },
+            {
+                ""Id"": ""test-large-1"",
+                ""Title"": ""대용량 미디어 솔루션"",
+                ""Description"": ""초고속 무손실 변환을 비즈니스에 도입하세요"",
+                ""BadgeText"": ""AD"",
+                ""ImageUrl"": ""https://example.com/large.png"",
+                ""TargetUrl"": ""https://example.com/b2b"",
+                ""CtaText"": ""솔루션 보기"",
+                ""Type"": 1,
+                ""IsActive"": true
+            }
+        ]";
+
+        int count = service.LoadAdsFromJson(json);
+
+        Assert.Equal(2, count);
+        var banners = service.GetBannerAds();
+        var largeCards = service.GetLargeCardAds();
+
+        Assert.Contains(banners, b => b.Id == "test-banner-1");
+        Assert.Contains(largeCards, l => l.Id == "test-large-1");
+    }
+}
diff --git a/src/Everything2Everything.Tests/AdViewModelTests.cs b/src/Everything2Everything.Tests/AdViewModelTests.cs
new file mode 100644
index 0000000..173fefc
--- /dev/null
+++ b/src/Everything2Everything.Tests/AdViewModelTests.cs
@@ -0,0 +1,102 @@
+using System.Collections.Generic;
+using Everything2Everything.App.ViewModels;
+using Everything2Everything.Core.Ads;
+using Xunit;
+
+namespace Everything2Everything.Tests;
+
+public class AdViewModelTests
+{
+    private class FakeAdService : IAdService
+    {
+        public List<AdItem> Banners { get; } = new()
+        {
+            new AdItem { Id = "b1", Title = "배너 1", TargetUrl = "https://example.com/b1", Type = AdType.Banner },
+            new AdItem { Id = "b2", Title = "배너 2", TargetUrl = "https://example.com/b2", Type = AdType.Banner }
+        };
+
+        public List<AdItem> Cards { get; } = new()
+        {
+            new AdItem { Id = "c1", Title = "카드 1", TargetUrl = "https://example.com/c1", Type = AdType.LargeCard },
+            new AdItem { Id = "c2", Title = "카드 2", TargetUrl = "https://example.com/c2", Type = AdType.LargeCard }
+        };
+
+        public AdItem? LastOpenedAd { get; private set; }
+        private int _bIndex = 0;
+        private int _cIndex = 0;
+
+        public IReadOnlyList<AdItem> GetBannerAds() => Banners;
+        public IReadOnlyList<AdItem> GetLargeCardAds() => Cards;
+
+        public AdItem? GetNextBannerAd()
+        {
+            var ad = Banners[_bIndex % Banners.Count];
+            _bIndex++;
+            return ad;
+        }
+
+        public AdItem? GetNextLargeCardAd()
+        {
+            var ad = Cards[_cIndex % Cards.Count];
+            _cIndex++;
+            return ad;
+        }
+
+        public System.Threading.Tasks.Task<int> RefreshAdsFromFeedAsync(string feedUrl, System.Threading.CancellationToken cancellationToken = default) => System.Threading.Tasks.Task.FromResult(0);
+        public int LoadAdsFromJson(string json) => 0;
+
+        public bool OpenAdUrl(AdItem ad)
+        {
+            LastOpenedAd = ad;
+            return true;
+        }
+    }
+
+    [Fact]
+    public void Constructor_InitializesAdsAndVisibility()
+    {
+        var fake = new FakeAdService();
+        var vm = new AdViewModel(fake);
+
+        Assert.NotNull(vm.CurrentBannerAd);
+        Assert.NotNull(vm.CurrentLargeAd);
+        Assert.True(vm.IsBannerVisible);
+        Assert.True(vm.IsLargeCardVisible);
+    }
+
+    [Fact]
+    public void ClickBannerAdCommand_OpensAdUrl()
+    {
+        var fake = new FakeAdService();
+        var vm = new AdViewModel(fake);
+
+        vm.ClickBannerAdCommand.Execute(null);
+
+        Assert.NotNull(fake.LastOpenedAd);
+        Assert.Equal(vm.CurrentBannerAd?.Id, fake.LastOpenedAd.Id);
+    }
+
+    [Fact]
+    public void DismissBannerCommand_HidesBanner()
+    {
+        var fake = new FakeAdService();
+        var vm = new AdViewModel(fake);
+
+        Assert.True(vm.IsBannerVisible);
+        vm.DismissBannerCommand.Execute(null);
+        Assert.False(vm.IsBannerVisible);
+    }
+
+    [Fact]
+    public void RotateBannerAd_ChangesCurrentBanner()
+    {
+        var fake = new FakeAdService();
+        var vm = new AdViewModel(fake);
+
+        var firstId = vm.CurrentBannerAd?.Id;
+        vm.RotateBannerAd();
+        var secondId = vm.CurrentBannerAd?.Id;
+
+        Assert.NotEqual(firstId, secondId);
+    }
+}
diff --git a/src/Everything2Everything.Tests/AgyChatClientTests.cs b/src/Everything2Everything.Tests/AgyChatClientTests.cs
new file mode 100644
index 0000000..cd52331
--- /dev/null
+++ b/src/Everything2Everything.Tests/AgyChatClientTests.cs
@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Everything2Everything.Core;
+using Everything2Everything.Core.Converters;
+using Xunit;
+
+namespace Everything2Everything.Tests;
+
+public class AgyChatClientTests
+{
+    private sealed class FakeStore : ISettingsStore
+    {
+        private readonly Dictionary<string, string> _d = new();
+        public string? Get(string key) => _d.TryGetValue(key, out var v) ? v : null;
+        public void Set(string key, string value) => _d[key] = value;
+        public void Remove(string key) => _d.Remove(key);
+        public bool Contains(string key) => _d.ContainsKey(key);
+    }
+
+    [Fact]
+    public void ExternalToolDetector_CanDetectAgy()
+    {
+        var available = ExternalToolDetector.IsAgyAvailable(out var path);
+        if (!available) return;
+        Assert.False(string.IsNullOrWhiteSpace(path));
+        Assert.EndsWith("agy.exe", path, StringComparison.OrdinalIgnoreCase);
+    }
+
+    [Fact]
+    public void AgyChatClient_HasCorrectName()
+    {
+        var client = new AgyChatClient();
+        Assert.Equal("Antigravity CLI (agy)", client.Name);
+    }
+
+    [Fact]
+    public void LlmProvider_ResolveClient_AutoSelectsAgyWhenNoKey()
+    {
+        var store = new FakeStore();
+        var provider = new LlmProvider(store);
+        var (client, model) = provider.ResolveClientForTesting(new AiOptions { Backend = "agy" });
+        Assert.NotNull(client);
+        Assert.IsType<AgyChatClient>(client);
+    }
+
+    [Fact]
+    public async Task LlmProvider_CheckAvailability_IsReadyWhenAgyAvailable()
+    {
+        if (!ExternalToolDetector.IsAgyAvailable(out _)) return;
+        var store = new FakeStore();
+        var provider = new LlmProvider(store);
+        var availability = await provider.CheckAvailabilityAsync();
+        Assert.True(availability.IsReady);
+    }
+}
+
diff --git a/src/Everything2Everything.Tests/DependencyInjectionTests.cs b/src/Everything2Everything.Tests/DependencyInjectionTests.cs
index ac0d403..0ff2f38 100644
--- a/src/Everything2Everything.Tests/DependencyInjectionTests.cs
+++ b/src/Everything2Everything.Tests/DependencyInjectionTests.cs
@@ -26,6 +26,7 @@ public class DependencyInjectionTests
 
         Assert.NotNull(sp.GetRequiredService<ProviderRegistry>());
         Assert.NotNull(sp.GetRequiredService<ConversionEngine>());
+        Assert.NotNull(sp.GetRequiredService<Everything2Everything.Core.Ads.IAdService>());
     }
 
     [Fact]
diff --git a/src/Everything2Everything.Tests/DesignAuditAstTests.cs b/src/Everything2Everything.Tests/DesignAuditAstTests.cs
index 9cd924d..e6647c1 100644
--- a/src/Everything2Everything.Tests/DesignAuditAstTests.cs
+++ b/src/Everything2Everything.Tests/DesignAuditAstTests.cs
@@ -944,8 +944,8 @@ public class DesignAuditAstTests
         Assert.NotNull(searchBoxCol);
 
         var widthVal = searchBoxCol.Attribute("Width")?.Value;
-        Assert.True(int.TryParse(widthVal, out var w) && w <= 180,
-            $"SearchBox 컬럼 폭은 180px 이하여야 필터 버튼들이 잘리지 않습니다. 현재: {widthVal}");
+        Assert.True(widthVal == "*" || (int.TryParse(widthVal, out var w) && w <= 180),
+            $"SearchBox 컬럼 폭은 가변(*)이거나 180px 이하여야 필터 컨트롤이 잘리지 않습니다. 현재: {widthVal}");
     }
 
     [Fact]
@@ -1104,6 +1104,33 @@ public class DesignAuditAstTests
         Assert.Equal("0", row);
         Assert.Equal("2", rowSpan);
     }
+
+    [Fact]
+    public void MainWindow_Toolbar_MustHave_FlexibleSearch_And_CategoryFilterDropdown_Without_Overflow()
+    {
+        // 파일명 검색창과 카테고리 필터가 좁은 창 가로폭(360px)에서도 씹힘/겹침(Overflow Collision)이 발생하지 않도록
+        // 1) 5개 개별 가로 버튼 대신 단일 폴드아웃 드롭다운(CategoryFilterCombo)으로 정합되어야 하며
+        // 2) 검색창은 Width="*" 컬럼에 위치하여 가변 너비를 가져야 하고
+        // 3) CategoryFilterCombo는 VerticalAlignment="Center"를 준수해야 한다.
+        var file = Path.Combine(ViewsDir, "MainWindow.xaml");
+        var doc = XDocument.Parse(File.ReadAllText(file));
+
+        // CategoryFilterCombo ComboBox 존재 검증
+        var combo = doc.Descendants().FirstOrDefault(e =>
+            e.Name.LocalName == "ComboBox" &&
+            e.Attribute(XName.Get("Name", "http://schemas.microsoft.com/winfx/2006/xaml"))?.Value == "CategoryFilterCombo");
+        Assert.NotNull(combo);
+
+        var vAlign = combo.Attribute("VerticalAlignment")?.Value;
+        Assert.Equal("Center", vAlign);
+
+        // 이전 5개 개별 가로 버튼(CommandParameter="All" 등)이 툴바에서 제거되어 드롭다운으로 대체되었는지 검증
+        var individualFilterButtons = doc.Descendants().Where(e =>
+            e.Name.LocalName == "Button" &&
+            e.Attribute("Command")?.Value?.Contains("FilterCategoryCommand") == true &&
+            e.Attribute("CommandParameter")?.Value is "All" or "Image" or "Document" or "Media" or "Data").ToList();
+        Assert.Empty(individualFilterButtons);
+    }
 }
 
 
diff --git a/src/Everything2Everything.Tests/DesignAuditVisualTreeTests.cs b/src/Everything2Everything.Tests/DesignAuditVisualTreeTests.cs
index dfe6530..3b6ed32 100644
--- a/src/Everything2Everything.Tests/DesignAuditVisualTreeTests.cs
+++ b/src/Everything2Everything.Tests/DesignAuditVisualTreeTests.cs
@@ -5,6 +5,7 @@ using System.Windows.Controls.Primitives;
 using System.Windows.Media;
 using Everything2Everything.App.Views;
 using Everything2Everything.Core;
+using Everything2Everything.Core.Filters;
 using Xunit;
 
 namespace Everything2Everything.Tests;
@@ -398,8 +399,9 @@ public class DesignAuditVisualTreeTests
             var encoder = new System.Windows.Media.Imaging.PngBitmapEncoder();
             encoder.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(rtb));
 
-            var outDir = @"C:\Users\encep\.gemini\antigravity\brain\a5abaf02-dd4b-45f7-8890-144e9da36bcc";
-            var outPath = System.IO.Path.Combine(outDir, "app_rendered_preview.png");
+            var outDir = @"C:\Users\encep\.gemini\antigravity\brain\b58fd023-a52b-4f4b-aa23-e6df654aa1fb";
+            if (!System.IO.Directory.Exists(outDir)) System.IO.Directory.CreateDirectory(outDir);
+            var outPath = System.IO.Path.Combine(outDir, "rendered_toolbar_fixed.png");
             using (var fs = new System.IO.FileStream(outPath, System.IO.FileMode.Create, System.IO.FileAccess.Write, System.IO.FileShare.ReadWrite))
             {
                 encoder.Save(fs);
@@ -410,6 +412,86 @@ public class DesignAuditVisualTreeTests
         });
     }
 
+    [Fact]
+    public void MainWindow_CategoryFilterCombo_ChangesCategory_And_FiltersQueue()
+    {
+        RunOnSta(() =>
+        {
+            var engine = Everything2EverythingBootstrap.CreateDefault();
+            var settings = new FakeSettingsStore();
+            var window = new MainWindow(engine, settings);
+            window.ActiveQueue.Add(new QueueItem { SourcePath = @"C:\test.png", FileName = "test.png" });
+            window.ActiveQueue.Add(new QueueItem { SourcePath = @"C:\doc.pdf", FileName = "doc.pdf" });
+            window.ActiveQueue.Add(new QueueItem { SourcePath = @"C:\clip.mp4", FileName = "clip.mp4" });
+            window.ActiveQueue.Add(new QueueItem { SourcePath = @"C:\sheet.xlsx", FileName = "sheet.xlsx" });
+
+            var combo = (ComboBox)window.FindName("CategoryFilterCombo");
+            Assert.NotNull(combo);
+            Assert.Equal(5, combo.Items.Count);
+
+            // 0: 전체 (All)
+            Assert.Equal(FilterCategory.All, window.SelectedCategory);
+
+            // 1: 이미지 (Image)
+            combo.SelectedIndex = 1;
+            Assert.Equal(FilterCategory.Image, window.SelectedCategory);
+
+            var view = System.Windows.Data.CollectionViewSource.GetDefaultView(window.ActiveQueue);
+            var filteredItems = view.Cast<QueueItem>().ToList();
+            Assert.Single(filteredItems);
+            Assert.Equal("test.png", filteredItems[0].FileName);
+
+            // 0: 전체 복귀 (All)
+            combo.SelectedIndex = 0;
+            Assert.Equal(FilterCategory.All, window.SelectedCategory);
+            filteredItems = view.Cast<QueueItem>().ToList();
+            Assert.Equal(4, filteredItems.Count);
+
+            // 가상 레이아웃 검증 (너비 360px 환경에서도 DesiredSize가 정상 계산되는지)
+            var content = (UIElement)window.Content;
+            content.Measure(new Size(360, 600));
+            content.Arrange(new Rect(0, 0, 360, 600));
+            Assert.True(content.DesiredSize.Width > 0);
+            Assert.False(double.IsNaN(content.DesiredSize.Width));
+        });
+    }
+
+    [Fact]
+    public void AdBannerControl_MeasureAndArrange_HasValidLayoutBounds()
+    {
+        RunOnSta(() =>
+        {
+            var adService = new Everything2Everything.Core.Ads.AdService();
+            var vm = new Everything2Everything.App.ViewModels.AdViewModel(adService);
+            var banner = new AdBannerControl { DataContext = vm };
+            banner.Measure(new Size(800, 100));
+            banner.Arrange(new Rect(0, 0, 800, 100));
+
+            Assert.True(banner.DesiredSize.Width > 0);
+            Assert.True(banner.DesiredSize.Height > 0);
+            Assert.False(double.IsNaN(banner.DesiredSize.Width));
+            Assert.False(double.IsNaN(banner.DesiredSize.Height));
+        });
+    }
+
+    [Fact]
+    public void AdLargeCardControl_MeasureAndArrange_HasValidLayoutBounds()
+    {
+        RunOnSta(() =>
+        {
+            var adService = new Everything2Everything.Core.Ads.AdService();
+            var vm = new Everything2Everything.App.ViewModels.AdViewModel(adService);
+            var card = new AdLargeCardControl { DataContext = vm };
+            card.Measure(new Size(340, 300));
+            card.Arrange(new Rect(0, 0, 340, 300));
+
+            Assert.True(card.DesiredSize.Width > 0);
+            Assert.True(card.DesiredSize.Height > 0);
+            Assert.False(double.IsNaN(card.DesiredSize.Width));
+            Assert.False(double.IsNaN(card.DesiredSize.Height));
+        });
+    }
+
     private static IEnumerable<T> FindLogicalChildren<T>(object parent) where T : DependencyObject
     {
         if (parent is ContentControl cc && cc.Content != null)
diff --git a/src/Everything2Everything.Tests/E2EUserScenarioTests.cs b/src/Everything2Everything.Tests/E2EUserScenarioTests.cs
index 3e70e86..114427c 100644
--- a/src/Everything2Everything.Tests/E2EUserScenarioTests.cs
+++ b/src/Everything2Everything.Tests/E2EUserScenarioTests.cs
@@ -3,6 +3,7 @@ using System.IO;
 using System.Linq;
 using Everything2Everything.App.ViewModels;
 using Everything2Everything.Core;
+using Everything2Everything.Core.Converters;
 using Everything2Everything.Core.Providers;
 using Everything2Everything.Core.Filters;
 using Xunit;
@@ -147,5 +148,56 @@ public class E2EUserScenarioTests
         Assert.False(MediaConversionNegotiator.CanConvert(".xlsx", ".png"));
     }
 
-}
+    [Theory]
+    [InlineData("summarize", null, "요약")]
+    [InlineData("translate", "일본어", "일본어")]
+    [InlineData("proofread", null, "교정")]
+    public void Scenario8_AiQuickPanel_Options_BuildPrompt_FormatsCorrectlyForAllTasks(string task, string? targetLang, string expectedKeyword)
+    {
+        var options = new AiOptions { Task = task, TargetLanguage = targetLang };
+        var (system, user) = LlmProvider.BuildPrompt(options, "테스트 입력 문장");
+        Assert.Contains(expectedKeyword, system);
+        Assert.Equal("테스트 입력 문장", user);
+    }
 
+    [Fact]
+    public async Task Scenario9_AiConversion_EndToEnd_SwitchboardResolution()
+    {
+        var tempDir = Path.Combine(Path.GetTempPath(), "E2E_AiConversion_" + Guid.NewGuid().ToString("N"));
+        Directory.CreateDirectory(tempDir);
+        try
+        {
+            var srcFile = Path.Combine(tempDir, "sample.md");
+            await File.WriteAllTextAsync(srcFile, "# Hello\nEverything2Everything test content.");
+
+            var store = new FakeSettingsStore();
+            store.Set("switchboard.endpoint", "http://192.168.0.225:8787");
+            var provider = new LlmProvider(store);
+
+            var options = new ConvertOptions
+            {
+                Ai = new AiOptions { Task = "summarize", Backend = "switchboard" }
+            };
+
+            var (client, _) = provider.ResolveClientForTesting(options.Ai);
+            Assert.NotNull(client);
+            Assert.Equal("Switchboard Gateway", client.Name);
+            var sbClient = Assert.IsType<SwitchboardChatClient>(client);
+            Assert.Equal("http://192.168.0.225:8787", sbClient.Endpoint);
+        }
+        finally
+        {
+            if (Directory.Exists(tempDir))
+                Directory.Delete(tempDir, true);
+        }
+    }
+
+    private sealed class FakeSettingsStore : ISettingsStore
+    {
+        private readonly Dictionary<string, string> _d = new();
+        public string? Get(string key) => _d.TryGetValue(key, out var v) ? v : null;
+        public void Set(string key, string value) => _d[key] = value;
+        public void Remove(string key) => _d.Remove(key);
+        public bool Contains(string key) => _d.ContainsKey(key);
+    }
+}
diff --git a/src/Everything2Everything.Tests/ExternalToolInstallerTests.cs b/src/Everything2Everything.Tests/ExternalToolInstallerTests.cs
new file mode 100644
index 0000000..ae61f46
--- /dev/null
+++ b/src/Everything2Everything.Tests/ExternalToolInstallerTests.cs
@@ -0,0 +1,117 @@
+using Everything2Everything.App.ViewModels;
+using Everything2Everything.Core.Converters;
+using Xunit;
+
+namespace Everything2Everything.Tests;
+
+public class ExternalToolInstallerTests
+{
+    [Fact]
+    public void Catalog_CoversAllKnownTools_WithVerifiedWingetIds()
+    {
+        var byKey = ExternalToolCatalog.All.ToDictionary(t => t.Key, StringComparer.OrdinalIgnoreCase);
+        Assert.Equal(7, byKey.Count);
+
+        Assert.Equal("Gyan.FFmpeg", byKey["ffmpeg"].WingetId);
+        Assert.Equal("TheDocumentFoundation.LibreOffice", byKey["libreoffice"].WingetId);
+        Assert.Equal("JohnMacFarlane.Pandoc", byKey["pandoc"].WingetId);
+        Assert.Equal("ImageMagick.ImageMagick", byKey["imagemagick"].WingetId);
+        Assert.Equal("Google.AntigravityCLI", byKey["agy"].WingetId);
+        Assert.Equal("OpenAI.Codex", byKey["codex"].WingetId);
+
+        Assert.Equal(ExternalToolInstallKind.Manual, byKey["h2orestart"].Kind);
+        Assert.False(string.IsNullOrWhiteSpace(byKey["h2orestart"].ManualNote));
+    }
+
+    [Fact]
+    public async Task InstallAsync_WingetTool_RunsSilentWinget_AndReportsInstalled()
+    {
+        var runner = new CapturingRunner();
+        var installer = new ExternalToolInstaller(runner);
+        var tool = WingetTool("test-tool", "Contoso.Demo", () => true);
+
+        var result = await installer.InstallAsync(tool, CancellationToken.None);
+
+        Assert.Equal("winget", runner.LastFileName);
+        Assert.Contains("--id Contoso.Demo", runner.LastArgs);
+        Assert.Contains("--silent", runner.LastArgs);
+        Assert.Contains("--accept-package-agreements", runner.LastArgs);
+        Assert.Contains("--accept-source-agreements", runner.LastArgs);
+        Assert.Contains("--disable-interactivity", runner.LastArgs);
+        Assert.True(result.Success);
+        Assert.Null(result.Message);
+    }
+
+    [Fact]
+    public async Task InstallAsync_WhenStillNotDetectedAfterRun_ReportsFailure()
+    {
+        var runner = new CapturingRunner { ExitCode = 1, Output = "installer failed" };
+        var installer = new ExternalToolInstaller(runner);
+        var tool = WingetTool("test-tool", "Contoso.Demo", () => false);
+
+        var result = await installer.InstallAsync(tool, CancellationToken.None);
+
+        Assert.False(result.Success);
+        Assert.Contains("실패", result.Message);
+        Assert.Equal(1, result.ExitCode);
+    }
+
+    [Fact]
+    public async Task InstallAsync_ManualKind_DoesNotRunAnything_ReturnsGuidance()
+    {
+        var runner = new CapturingRunner();
+        var installer = new ExternalToolInstaller(runner);
+        var tool = new ExternalToolDefinition
+        {
+            Key = "manual",
+            DisplayName = "Manual",
+            Description = "d",
+            Kind = ExternalToolInstallKind.Manual,
+            ManualNote = "직접 추가하세요",
+            IsInstalled = () => false,
+        };
+
+        var result = await installer.InstallAsync(tool, CancellationToken.None);
+
+        Assert.Null(runner.LastFileName);
+        Assert.False(result.Success);
+        Assert.Equal("직접 추가하세요", result.Message);
+    }
+
+    [Fact]
+    public void ToolSetupViewModel_DefaultsToAllSelected_AndCoversCatalog()
+    {
+        var vm = new ToolSetupViewModel(
+            ExternalToolCatalog.All,
+            new ExternalToolInstaller(new CapturingRunner()));
+
+        Assert.Equal(ExternalToolCatalog.All.Count, vm.Tools.Count);
+        Assert.All(vm.Tools, t => Assert.True(t.IsSelected));
+        Assert.True(vm.SelectAll);
+    }
+
+    private static ExternalToolDefinition WingetTool(string key, string id, Func<bool> installed) => new()
+    {
+        Key = key,
+        DisplayName = key,
+        Description = key,
+        Kind = ExternalToolInstallKind.Winget,
+        WingetId = id,
+        IsInstalled = installed,
+    };
+
+    private sealed class CapturingRunner : IExternalCommandRunner
+    {
+        public string? LastFileName;
+        public string? LastArgs;
+        public int ExitCode { get; set; }
+        public string Output { get; set; } = "";
+
+        public Task<ExternalCommandResult> RunAsync(string fileName, string arguments, string? workingDirectory, CancellationToken ct)
+        {
+            LastFileName = fileName;
+            LastArgs = arguments;
+            return Task.FromResult(new ExternalCommandResult(ExitCode, Output));
+        }
+    }
+}
diff --git a/src/Everything2Everything.Tests/LlmProviderTests.cs b/src/Everything2Everything.Tests/LlmProviderTests.cs
index 5673273..f557378 100644
--- a/src/Everything2Everything.Tests/LlmProviderTests.cs
+++ b/src/Everything2Everything.Tests/LlmProviderTests.cs
@@ -25,8 +25,8 @@ public class LlmProviderTests
     [Fact]
     public async Task NoKey_IsNotReady()
     {
-        // 환경변수 키 또는 codex CLI(OAuth)가 있으면 AI가 활성화되므로 이 단언은 건너뜀
-        if (EnvHasKey() || ExternalToolDetector.IsCodexAvailable()) return;
+        // 환경변수 키 또는 codex/agy CLI(OAuth) 또는 Switchboard Gateway가 있으면 AI가 활성화되므로 이 단언은 건너뜀
+        if (EnvHasKey() || ExternalToolDetector.IsCodexAvailable() || ExternalToolDetector.IsAgyAvailable(out _) || ExternalToolDetector.IsSwitchboardGatewayAvailable(out _)) return;
         var p = new LlmProvider(new FakeStore());
         var a = await p.CheckAvailabilityAsync();
         Assert.False(a.IsReady);
diff --git a/src/Everything2Everything.Tests/SwitchboardChatClientTests.cs b/src/Everything2Everything.Tests/SwitchboardChatClientTests.cs
new file mode 100644
index 0000000..489d3c7
--- /dev/null
+++ b/src/Everything2Everything.Tests/SwitchboardChatClientTests.cs
@@ -0,0 +1,82 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Everything2Everything.Core;
+using Everything2Everything.Core.Converters;
+using Xunit;
+
+namespace Everything2Everything.Tests;
+
+public class SwitchboardChatClientTests
+{
+    private sealed class FakeStore : ISettingsStore
+    {
+        private readonly Dictionary<string, string> _d = new();
+        public string? Get(string key) => _d.TryGetValue(key, out var v) ? v : null;
+        public void Set(string key, string value) => _d[key] = value;
+        public void Remove(string key) => _d.Remove(key);
+        public bool Contains(string key) => _d.ContainsKey(key);
+    }
+
+    [Fact]
+    public void SwitchboardChatClient_HasCorrectNameAndEndpoint()
+    {
+        var client = new SwitchboardChatClient();
+        Assert.Equal("Switchboard Gateway", client.Name);
+        Assert.Equal("http://127.0.0.1:8787", client.Endpoint);
+    }
+
+    [Fact]
+    public void SwitchboardChatClient_CustomEndpoint_IsPreserved()
+    {
+        var client = new SwitchboardChatClient("http://192.168.1.100:8787/");
+        Assert.Equal("http://192.168.1.100:8787", client.Endpoint);
+    }
+
+    [Fact]
+    public void LlmProvider_ResolveClient_SelectsSwitchboardWhenRequested()
+    {
+        var store = new FakeStore();
+        store.Set("switchboard.endpoint", "http://127.0.0.1:8787");
+        var provider = new LlmProvider(store);
+        var (client, model) = provider.ResolveClientForTesting(new AiOptions { Backend = "switchboard" });
+        Assert.NotNull(client);
+        Assert.IsType<SwitchboardChatClient>(client);
+    }
+
+    [Fact]
+    public async Task CheckSwitchboardGatewayHealthAsync_ReturnsFalseForUnreachablePort()
+    {
+        var (available, _, _) = await ExternalToolDetector.CheckSwitchboardGatewayHealthAsync("http://127.0.0.1:59999");
+        Assert.False(available);
+    }
+
+    [Fact]
+    public void ExternalToolDetector_IsSwitchboardGatewayAvailable_DoesNotThrow()
+    {
+        var available = ExternalToolDetector.IsSwitchboardGatewayAvailable(out var ep);
+        Assert.Equal("http://127.0.0.1:8787", ep);
+        // Returns bool without hanging or throwing
+    }
+
+    [Fact]
+    public void LlmProvider_CustomEndpoint_IsUsedWhenConfigured()
+    {
+        var store = new FakeStore();
+        store.Set("switchboard.endpoint", "http://192.168.0.25:8787");
+        var provider = new LlmProvider(store);
+        var (client, _) = provider.ResolveClientForTesting(new AiOptions { Backend = "switchboard" });
+        Assert.NotNull(client);
+        var sbClient = Assert.IsType<SwitchboardChatClient>(client);
+        Assert.Equal("http://192.168.0.25:8787", sbClient.Endpoint);
+    }
+
+    [Fact]
+    public void ExternalToolDetector_IsSwitchboardGatewayAvailable_WithCustomEndpoint_PreservesEndpoint()
+    {
+        var available = ExternalToolDetector.IsSwitchboardGatewayAvailable(out var ep, "http://192.168.0.25:8787/");
+        Assert.Equal("http://192.168.0.25:8787", ep);
+        Assert.False(available);
+    }
+}
+