diff --git a/README.md b/README.md
index 933f2fa..f2ddd4c 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,11 @@ Windows 전용 시맨틱 런처 & 워크스페이스 매니저
 - 메시지 행과 좌측 대화 목록도 `claw-code` 방향으로 다시 단순화했습니다. 사용자/assistant 버블의 패딩, 라운드, 메타 텍스트를 줄였고, 대화 목록의 실행 상태도 배지 카드보다 얇은 텍스트 요약 중심으로 바꿔 읽는 축이 먼저 보이도록 눌렀습니다.
 - 검증 예정: `dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify\\ -p:IntermediateOutputPath=obj\\verify\\`
 
+- 업데이트: 2026-04-05 17:03 (KST)
+- AX Agent UI를 `claw-code` 쪽 시각 언어에 더 가깝게 맞추기 위해 레이아웃 골격을 다시 조정했습니다. 좌측 패널 폭과 헤더/액션 행 높이, 축소 아이콘 바, 상태 스트립, 메시지 축, 컴포저 폭과 코너 반경을 전반적으로 더 얇고 평평하게 정리했습니다.
+- 반응형 폭 계산도 새 골격에 맞춰 다시 조정했습니다. 메시지 축은 최대 `880`, 컴포저는 최대 `820` 기준으로 더 자연스럽게 줄어들도록 바꿔 창 크기가 변해도 `claw-code`처럼 중심선이 크게 흔들리지 않게 맞췄습니다.
+- 검증 예정: `dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify\\ -p:IntermediateOutputPath=obj\\verify\\`
+
 - 업데이트: 2026-04-05 16:02 (KST)
 - `document_plan` 후속 실행 분기를 `claw-code` 기준으로 다시 보강했습니다. 이제 문서 플래너 출력에서 body 골격과 즉시 실행 지시를 깨진 문자열 비교에 의존하지 않고 안정적으로 추출해, `html_create / document_assemble / docx_create / markdown_create` 후속 호출 유도가 실제로 이어집니다.
 - 코워크 문서형 작업은 설정이 `planMode=off`여도 내부적으로 `always` 플랜 경로를 타도록 보정했습니다. 그래서 문서/보고서/제안서 요청은 먼저 계획을 세우고, 그 계획을 바탕으로 실제 문서 생성 단계까지 이어가도록 정리했습니다.
diff --git a/docs/DEVELOPMENT.md b/docs/DEVELOPMENT.md
index 5baec36..1ab1801 100644
--- a/docs/DEVELOPMENT.md
+++ b/docs/DEVELOPMENT.md
@@ -3,6 +3,8 @@
 - Document update: 2026-04-05 16:55 (KST) - Recorded the current `claw-code` parity estimate for AX Agent: core execution engine `82%`, main chat UI `68%`, Cowork/Code status UX `63%`, internal settings linkage `88%`, overall AX Agent parity `74%`.
 - Document update: 2026-04-05 16:55 (KST) - Added an engine-settings review rule for ongoing cleanup: settings that materially alter the main execution route should be minimized, kept developer-only when necessary, or removed from user-facing surfaces when they no longer represent real runtime choices. Plan-mode remnants were reduced further as part of this pass.
 - Document update: 2026-04-05 16:55 (KST) - Simplified AX Agent message rows and sidebar conversation items toward the `claw-code` reading model. Message bubbles now use tighter padding/radius/meta text, and conversation rows now prefer lightweight running/failure summary text over heavier success/failure badge cards.
+- Document update: 2026-04-05 17:03 (KST) - Reworked the AX Agent UI skeleton further toward `claw-code`: sidebar width and row heights were tightened, the collapsed icon rail and sidebar header were flattened, status strips were reduced, and the composer shell/input chrome was made slimmer and less card-like.
+- Document update: 2026-04-05 17:03 (KST) - Re-tuned responsive width calculation for the new shell so the message axis now scales up to `880` and the composer up to `820`, keeping both aligned on the same center line as the window narrows or expands.
 - Document update: 2026-04-05 16:02 (KST) - Fixed the Cowork document execution handoff around `document_plan`. The loop no longer depends on broken localized marker strings to detect the scaffold/body block or the immediate-next-step hint; it now extracts body markers robustly and resolves the correct follow-up tool (`html_create`, `document_assemble`, `docx_create`, `markdown_create`) before re-prompting the model.
 - Document update: 2026-04-05 16:02 (KST) - Added `ResolveEffectivePlanMode(...)` so Cowork document/content tasks automatically use the `always` plan path even when the persisted plan mode is `off`. This brings Cowork closer to the `claw-code` expectation of plan-first execution for document-heavy work.
 - Document update: 2026-04-05 16:02 (KST) - Strengthened `BuildCoworkSystemPrompt()` so document/report/proposal/manual requests must produce an execution plan first and are not considered complete until a real output file path has been created or updated.
diff --git a/src/AxCopilot/Views/ChatWindow.xaml b/src/AxCopilot/Views/ChatWindow.xaml
index 3b9e157..1e94dd6 100644
--- a/src/AxCopilot/Views/ChatWindow.xaml
+++ b/src/AxCopilot/Views/ChatWindow.xaml
@@ -406,7 +406,7 @@
                 <!-- 축소 아이콘 바 (사이드바 닫힘 시 표시) -->
                 <ColumnDefinition x:Name="IconBarColumn" Width="0"/>
                 <!-- 사이드바 (열림 시 표시) -->
-                <ColumnDefinition x:Name="SidebarColumn" Width="220" MinWidth="0"/>
+                <ColumnDefinition x:Name="SidebarColumn" Width="236" MinWidth="0"/>
                 <ColumnDefinition Width="*"/>
                 <!-- 미리보기 스플리터 -->
                 <ColumnDefinition x:Name="SplitterColumn" Width="0"/>
@@ -422,32 +422,32 @@
                     Visibility="Collapsed">
                 <Grid>
                     <Grid.RowDefinitions>
-                        <RowDefinition Height="46"/>
+                        <RowDefinition Height="44"/>
                         <RowDefinition Height="*"/>
-                        <RowDefinition Height="46"/>
+                        <RowDefinition Height="44"/>
                     </Grid.RowDefinitions>
 
                     <!-- 상단 아이콘들 -->
                     <StackPanel Grid.Row="0" VerticalAlignment="Center" HorizontalAlignment="Center" Margin="0,2,0,0">
-                        <Button Style="{StaticResource GhostBtn}" Padding="6,5" Width="32" Height="32"
+                        <Button Style="{StaticResource GhostBtn}" Padding="5,4" Width="30" Height="30"
                                 Click="BtnNewChat_Click" ToolTip="새 대화"
                                 WindowChrome.IsHitTestVisibleInChrome="True">
-                            <TextBlock Text="&#xE710;" FontFamily="Segoe MDL2 Assets" FontSize="12"
+                            <TextBlock Text="&#xE710;" FontFamily="Segoe MDL2 Assets" FontSize="11.5"
                                        Foreground="{DynamicResource SecondaryText}"/>
                         </Button>
                     </StackPanel>
 
                     <StackPanel Grid.Row="1" VerticalAlignment="Top" HorizontalAlignment="Center" Margin="0,6,0,0">
-                        <Button Style="{StaticResource GhostBtn}" Padding="6,5" Width="32" Height="32"
+                        <Button Style="{StaticResource GhostBtn}" Padding="5,4" Width="30" Height="30"
                                 Click="BtnToggleSidebar_Click" ToolTip="검색"
                                 WindowChrome.IsHitTestVisibleInChrome="True">
-                            <TextBlock Text="&#xE721;" FontFamily="Segoe MDL2 Assets" FontSize="11.5"
+                            <TextBlock Text="&#xE721;" FontFamily="Segoe MDL2 Assets" FontSize="11"
                                        Foreground="{DynamicResource SecondaryText}"/>
                         </Button>
-                        <Button Style="{StaticResource GhostBtn}" Padding="6,5" Width="32" Height="32" Margin="0,2,0,0"
+                        <Button Style="{StaticResource GhostBtn}" Padding="5,4" Width="30" Height="30" Margin="0,2,0,0"
                                 Click="BtnCategoryDrop_Click" ToolTip="대화 필터"
                                 WindowChrome.IsHitTestVisibleInChrome="True">
-                            <TextBlock Text="&#xE8BD;" FontFamily="Segoe MDL2 Assets" FontSize="11.5"
+                            <TextBlock Text="&#xE8BD;" FontFamily="Segoe MDL2 Assets" FontSize="11"
                                        Foreground="{DynamicResource SecondaryText}"/>
                         </Button>
                     </StackPanel>
@@ -457,11 +457,11 @@
                             HorizontalAlignment="Center" VerticalAlignment="Center"
                             ToolTip="" Padding="0"
                             WindowChrome.IsHitTestVisibleInChrome="True">
-                        <Border Width="28" Height="28" CornerRadius="14"
+                        <Border Width="26" Height="26" CornerRadius="13"
                                 Background="{DynamicResource HintBackground}"
                                 BorderBrush="{DynamicResource BorderColor}"
                                 BorderThickness="1">
-                            <TextBlock x:Name="UserInitialIconBar" Text="U" FontSize="11.5" FontWeight="SemiBold"
+                            <TextBlock x:Name="UserInitialIconBar" Text="U" FontSize="11" FontWeight="SemiBold"
                                        Foreground="{DynamicResource PrimaryText}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                         </Border>
                     </Button>
@@ -477,7 +477,7 @@
                     BorderThickness="0,0,1,0">
                 <Grid>
                     <Grid.RowDefinitions>
-                        <RowDefinition Height="48"/>
+                        <RowDefinition Height="44"/>
                         <RowDefinition Height="Auto"/>
                         <RowDefinition Height="Auto"/>
                         <RowDefinition Height="Auto"/>
@@ -492,11 +492,11 @@
                             <Border Background="{DynamicResource HintBackground}" CornerRadius="6"
                                     BorderBrush="{DynamicResource BorderColor}"
                                     BorderThickness="1"
-                                    Width="22" Height="22">
-                                <TextBlock Text="&#xE8BD;" FontFamily="Segoe MDL2 Assets" FontSize="11"
+                                    Width="20" Height="20">
+                                <TextBlock Text="&#xE8BD;" FontFamily="Segoe MDL2 Assets" FontSize="10.5"
                                            Foreground="{DynamicResource AccentColor}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                             </Border>
-                            <TextBlock Text="AX Agent" FontSize="13" FontWeight="SemiBold"
+                            <TextBlock Text="AX Agent" FontSize="12.5" FontWeight="SemiBold"
                                        Foreground="{DynamicResource PrimaryText}"
                                        VerticalAlignment="Center" Margin="8,0,0,0"/>
                         </StackPanel>
@@ -507,8 +507,8 @@
                         <StackPanel>
                             <Border x:Name="SidebarNewChatTrigger"
                                     Background="Transparent"
-                                    CornerRadius="7"
-                                    Padding="8,6"
+                                    CornerRadius="6"
+                                    Padding="7,5"
                                     Cursor="Hand"
                                     MouseEnter="SidebarNewChatTrigger_MouseEnter"
                                     MouseLeave="SidebarNewChatTrigger_MouseLeave"
@@ -519,25 +519,25 @@
                                         <ColumnDefinition Width="*"/>
                                         <ColumnDefinition Width="Auto"/>
                                     </Grid.ColumnDefinitions>
-                                    <TextBlock Text="&#xE710;" FontFamily="Segoe MDL2 Assets" FontSize="11"
+                                    <TextBlock Text="&#xE710;" FontFamily="Segoe MDL2 Assets" FontSize="10.5"
                                                Foreground="{DynamicResource SecondaryText}" VerticalAlignment="Center"/>
                                     <TextBlock Grid.Column="1" Text="새 대화"
                                                Foreground="{DynamicResource PrimaryText}"
-                                               FontSize="10.8" Margin="7,0,0,0" VerticalAlignment="Center"/>
+                                               FontSize="10.5" Margin="7,0,0,0" VerticalAlignment="Center"/>
                                     <TextBlock x:Name="SidebarNewChatShortcutHint"
                                                Grid.Column="2"
                                                Text="Ctrl+N"
                                                Visibility="Collapsed"
                                                Foreground="{DynamicResource SecondaryText}"
-                                               FontSize="10.5"
+                                               FontSize="10"
                                                VerticalAlignment="Center"/>
                                 </Grid>
                             </Border>
 
                             <Border x:Name="SidebarSearchTrigger"
                                     Background="Transparent"
-                                    CornerRadius="7"
-                                    Padding="8,6"
+                                    CornerRadius="6"
+                                    Padding="7,5"
                                     Cursor="Hand"
                                     MouseEnter="SidebarSearchTrigger_MouseEnter"
                                     MouseLeave="SidebarSearchTrigger_MouseLeave"
@@ -548,25 +548,25 @@
                                         <ColumnDefinition Width="*"/>
                                         <ColumnDefinition Width="Auto"/>
                                     </Grid.ColumnDefinitions>
-                                    <TextBlock Text="&#xE721;" FontFamily="Segoe MDL2 Assets" FontSize="11"
+                                    <TextBlock Text="&#xE721;" FontFamily="Segoe MDL2 Assets" FontSize="10.5"
                                                Foreground="{DynamicResource SecondaryText}" VerticalAlignment="Center"/>
                                     <TextBlock Grid.Column="1" Text="검색"
                                                Foreground="{DynamicResource PrimaryText}"
-                                               FontSize="10.8" Margin="7,0,0,0" VerticalAlignment="Center"/>
+                                               FontSize="10.5" Margin="7,0,0,0" VerticalAlignment="Center"/>
                                     <TextBlock x:Name="SidebarSearchShortcutHint"
                                                Grid.Column="2"
                                                Text="Ctrl+K"
                                                Visibility="Collapsed"
                                                Foreground="{DynamicResource SecondaryText}"
-                                               FontSize="10.5"
+                                               FontSize="10"
                                                VerticalAlignment="Center"/>
                                 </Grid>
                             </Border>
 
                             <Border x:Name="SidebarSearchEditor"
                                     Background="{DynamicResource ItemBackground}"
-                                    CornerRadius="10"
-                                    Padding="9,6"
+                                    CornerRadius="8"
+                                    Padding="8,5"
                                     Visibility="Collapsed"
                                     Opacity="0"
                                     RenderTransformOrigin="0,0.5">
@@ -586,7 +586,7 @@
                                     <TextBox x:Name="SearchBox" Grid.Column="1"
                                              Background="Transparent" BorderThickness="0"
                                              Foreground="{DynamicResource PrimaryText}"
-                                             CaretBrush="{DynamicResource AccentColor}" FontSize="11.5"
+                                             CaretBrush="{DynamicResource AccentColor}" FontSize="11"
                                              VerticalAlignment="Center" Margin="10,0,8,0"
                                              TextChanged="SearchBox_TextChanged"/>
                                     <Button x:Name="BtnConversationSort" Grid.Column="2"
@@ -872,25 +872,25 @@
                                              KeyDown="ChatTitleEdit_KeyDown"/>
                                 </Grid>
                                 <Border x:Name="ConversationStatusStrip" Visibility="Collapsed"
-                                        Margin="8,0,0,0" Padding="6,1.5"
-                                        CornerRadius="7"
+                                        Margin="8,0,0,0" Padding="5,1.5"
+                                        CornerRadius="6"
                                         Background="{DynamicResource HintBackground}"
                                         BorderBrush="{DynamicResource BorderColor}" BorderThickness="1">
                                     <TextBlock x:Name="ConversationStatusStripLabel" Text=""
-                                               FontSize="9.5" FontWeight="SemiBold"
+                                               FontSize="9" FontWeight="SemiBold"
                                                Foreground="{DynamicResource AccentColor}"
                                                VerticalAlignment="Center"/>
                                 </Border>
                             </StackPanel>
                             <WrapPanel x:Name="ConversationQuickStrip" Visibility="Collapsed"
-                                       Margin="0,3,0,0">
+                                       Margin="0,2,0,0">
                                 <Button x:Name="BtnQuickRunningFilter" Style="{StaticResource GhostBtn}"
-                                        Padding="7,1.5" Margin="0,0,5,0"
+                                        Padding="6,1.5" Margin="0,0,4,0"
                                         Click="BtnQuickRunningFilter_Click"
                                         Visibility="Collapsed"
                                         IsEnabled="False">
                                     <TextBlock x:Name="QuickRunningLabel" Text="진행"
-                                               FontSize="9.5" FontWeight="SemiBold"/>
+                                               FontSize="9" FontWeight="SemiBold"/>
                                 </Button>
                                 <Button x:Name="BtnQuickHotSort" Style="{StaticResource GhostBtn}"
                                         Padding="7,1.5"
@@ -1183,8 +1183,8 @@
                               Background="{DynamicResource LauncherBackground}"
                               Padding="18,10,18,6">
                     <StackPanel x:Name="MessagePanel"
-                                Margin="0,0,0,14"
-                                MaxWidth="840"
+                                Margin="0,0,0,12"
+                                MaxWidth="880"
                                 HorizontalAlignment="Center">
                         <StackPanel.RenderTransform>
                             <TranslateTransform/>
@@ -1560,9 +1560,9 @@
 
                 <!-- ── 입력 바 ── -->
                 <Border x:Name="ComposerShell" Grid.Row="4"
-                        Margin="18,0,18,16"
+                        Margin="18,0,18,14"
                         Width="Auto"
-                        MaxWidth="760"
+                        MaxWidth="820"
                         HorizontalAlignment="Center"
                         VerticalAlignment="Bottom">
                     <StackPanel HorizontalAlignment="Stretch">
@@ -1651,7 +1651,7 @@
                             <!-- 실제 입력 영역 -->
                                 <Border x:Name="InputBorder"
                                 Background="{DynamicResource LauncherBackground}"
-                                CornerRadius="10" Padding="5"
+                                CornerRadius="9" Padding="4"
                                 BorderBrush="{DynamicResource BorderColor}" BorderThickness="1">
                             <Border.Effect>
                                 <DropShadowEffect BlurRadius="10" ShadowDepth="0" Opacity="0.04"/>
diff --git a/src/AxCopilot/Views/ChatWindow.xaml.cs b/src/AxCopilot/Views/ChatWindow.xaml.cs
index 99c9fed..73dd795 100644
--- a/src/AxCopilot/Views/ChatWindow.xaml.cs
+++ b/src/AxCopilot/Views/ChatWindow.xaml.cs
@@ -10975,14 +10975,14 @@ public partial class ChatWindow : Window
 
         // claw-code처럼 메시지 축과 입력축이 같은 중심선을 공유하도록,
         // 본문 폭 상한을 조금 더 낮추고 창 폭 변화에 더 부드럽게 반응시킵니다.
-        var contentWidth = Math.Max(340, viewportWidth - 32);
-        var messageWidth = Math.Clamp(contentWidth * 0.86, 340, 840);
-        var composerWidth = Math.Clamp(contentWidth * 0.78, 340, 760);
+        var contentWidth = Math.Max(340, viewportWidth - 28);
+        var messageWidth = Math.Clamp(contentWidth * 0.88, 340, 880);
+        var composerWidth = Math.Clamp(contentWidth * 0.82, 340, 820);
 
         if (contentWidth < 760)
         {
-            messageWidth = Math.Clamp(contentWidth - 10, 332, 760);
-            composerWidth = Math.Clamp(contentWidth - 20, 328, 700);
+            messageWidth = Math.Clamp(contentWidth - 8, 332, 780);
+            composerWidth = Math.Clamp(contentWidth - 14, 328, 740);
         }
 
         var changed = false;