diff --git a/apps/web/tests/built-boot.snapshot.ts b/apps/web/tests/built-boot.snapshot.ts
index 3a688bbe5c..6999543b00 100644
--- a/apps/web/tests/built-boot.snapshot.ts
+++ b/apps/web/tests/built-boot.snapshot.ts
@@ -73,6 +73,7 @@ it('boots the built plugin graph and renders a fixture session end to end', asyn
       + (commit === undefined ? '' : `-${commit}`)
       + (clientBuildValue('DSH_CLIENT_GIT_DIRTY') === 'true' ? '-dirty' : '')
     screen.getByText('DSH')
+    screen.getByText('Local Build')
     screen.getByText(buildVersion)
   }
   // The compact layout dropped group session counts; the fixture workspace
diff --git a/packages/client/ui-sidebar/README.i18n.yaml b/packages/client/ui-sidebar/README.i18n.yaml
index d33c1ce612..2a3119689c 100644
--- a/packages/client/ui-sidebar/README.i18n.yaml
+++ b/packages/client/ui-sidebar/README.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-sidebar/README.md
-README.md: 8a7963f1cd5cd0cf9e1d951e68aa53a35f0c4c3c
-README.zh.md: 4c9040589ab8a28897821a2e476786ccf8ace50c
+README.md: 406f2930ac1deb9bf8e12caedbcfb11f7fc35fbc
+README.zh.md: 147c30b5de5db07bbffa665157c3707430c0a099
diff --git a/packages/client/ui-sidebar/README.md b/packages/client/ui-sidebar/README.md
index 8a7963f1cd..406f2930ac 100644
--- a/packages/client/ui-sidebar/README.md
+++ b/packages/client/ui-sidebar/README.md
@@ -4,7 +4,7 @@ English | [中文](README.zh.md)
 
 Sidebar shell plugin: the brand row, New Session action, layout-owned collapse control, scroll-aware region seat, and bottom-pinned Settings seat. [ui-workspace](../ui-workspace/README.md) owns the Workspace and Session browser rendered into `sidebar.workspaces`; this package neither derives its rows nor owns its view preferences. Collapse into the layout-owned 56px rail remains presentation-local. Contract: the [slot system standard](../../../.agents/notes/implemented/architecture/2026-07-22-slot-type-chain-implementation.md).
 
-The expanded brand row renders `sidebar.brand.mark` and `sidebar.brand.name` as independent single slots, while the collapsed rail renders the same mark slot. Without occupants, the shell uses the fish mark and a local-build fallback: a complete build renders `DSH` plus a code badge assembled as `version[-commit][-dirty]` from `DSH_CLIENT_VERSION`, the optional 7-character `DSH_CLIENT_COMMIT_HASH`, and `DSH_CLIENT_GIT_DIRTY=true`; missing version metadata retains the defensive `DSH Local Build` label. A deployment package can replace either value without replacing the New Session control or rail geometry; declaration-aware `slots.inject()` lets such a package activate before or after the sidebar.
+The expanded brand row renders `sidebar.brand.mark` and `sidebar.brand.name` as independent single slots, while the collapsed rail renders the same mark slot. Without occupants, the shell uses the fish mark and a local-build fallback: a complete build renders `DSH` with a small `Local Build` caption plus a code badge assembled as `version[-commit][-dirty]` from `DSH_CLIENT_VERSION`, the optional 7-character `DSH_CLIENT_COMMIT_HASH`, and `DSH_CLIENT_GIT_DIRTY=true`; missing version metadata retains the defensive `DSH Local Build` label. A deployment package can replace either value without replacing the New Session control or rail geometry; declaration-aware `slots.inject()` lets such a package activate before or after the sidebar.
 
 New Session starts the runtime's page-local frontend Session Intent. The runtime targets the explicit Workspace used by a scoped action, otherwise the current Session's Workspace, otherwise the most recently active Workspace; when none exists it clears into the blank New Session page. Workspace-specific controls and the shared picker belong to ui-workspace.
 
diff --git a/packages/client/ui-sidebar/README.zh.md b/packages/client/ui-sidebar/README.zh.md
index 4c9040589a..147c30b5de 100644
--- a/packages/client/ui-sidebar/README.zh.md
+++ b/packages/client/ui-sidebar/README.zh.md
@@ -4,7 +4,7 @@
 
 侧边栏外壳插件：负责品牌行、New Session 操作、布局持有的折叠控件、可感知滚动的区域 seat，以及固定在底部的 Settings seat。[ui-workspace](../ui-workspace/README.zh.md) 持有渲染到 `sidebar.workspaces` 的 Workspace 与 Session 浏览器；本包既不派生其中的行，也不持有其视图偏好。折叠到布局拥有的 56px 轨道仍属于本地呈现行为。约定：[slot 系统标准](../../../.agents/notes/implemented/architecture/2026-07-22-slot-type-chain-implementation.zh.md)。
 
-展开的品牌行把 `sidebar.brand.mark` 与 `sidebar.brand.name` 渲染为两个独立的 single slot，收起轨道则渲染同一个 mark slot。没有占位者时，外壳使用鱼形标记和本地构建 fallback：完整构建显示 `DSH`，并把 `DSH_CLIENT_VERSION`、可选的 7 位 `DSH_CLIENT_COMMIT_HASH` 及 `DSH_CLIENT_GIT_DIRTY=true` 组装成 `version[-commit][-dirty]` 代码徽标；缺少版本元数据时保留防御性的 `DSH Local Build` 标签。部署包可以单独替换任一值，而无须替换 New Session 控件或轨道几何；声明感知的 `slots.inject()` 让这种包无论先于还是后于侧边栏激活都能生效。
+展开的品牌行把 `sidebar.brand.mark` 与 `sidebar.brand.name` 渲染为两个独立的 single slot，收起轨道则渲染同一个 mark slot。没有占位者时，外壳使用鱼形标记和本地构建 fallback：完整构建显示 `DSH`、小号 `Local Build` 标注，以及把 `DSH_CLIENT_VERSION`、可选的 7 位 `DSH_CLIENT_COMMIT_HASH` 与 `DSH_CLIENT_GIT_DIRTY=true` 组装成的 `version[-commit][-dirty]` 代码徽标；缺少版本元数据时保留防御性的 `DSH Local Build` 标签。部署包可以单独替换任一值，而无须替换 New Session 控件或轨道几何；声明感知的 `slots.inject()` 让这种包无论先于还是后于侧边栏激活都能生效。
 
 New Session 会启动运行时的页面局部前端 Session Intent。运行时优先使用作用域操作明确指定的 Workspace，否则使用当前 Session 所属 Workspace，再否则使用最近活跃 Workspace；一个 Workspace 都没有时则清空选择，进入空白 New Session 页面。Workspace 专属控件与共享选择器由 ui-workspace 持有。
 
diff --git a/packages/client/ui-sidebar/src/client/SidebarRoot.module.css b/packages/client/ui-sidebar/src/client/SidebarRoot.module.css
index fc2ec94aaa..d280ab647f 100644
--- a/packages/client/ui-sidebar/src/client/SidebarRoot.module.css
+++ b/packages/client/ui-sidebar/src/client/SidebarRoot.module.css
@@ -159,6 +159,30 @@
   white-space: nowrap;
 }
 
+.localBuildBrand {
+  flex: none;
+  display: inline-flex;
+  flex-direction: column;
+  align-items: flex-start;
+  justify-content: center;
+  height: 24px;
+  white-space: nowrap;
+}
+
+.localBuildName {
+  font-size: 16px;
+  line-height: 15px;
+  letter-spacing: 0;
+}
+
+.localBuildLabel {
+  color: var(--dsw-alias-label-secondary);
+  font-size: 7px;
+  font-weight: 500;
+  line-height: 8px;
+  letter-spacing: 0.02em;
+}
+
 .iconButton {
   flex: none;
   display: inline-flex;
@@ -211,6 +235,7 @@
 }
 
 .buildVersion {
+  flex: none;
   display: inline-flex;
   align-items: center;
   height: 16px;
@@ -222,6 +247,7 @@
   font-size: 8px;
   font-weight: 500;
   line-height: 16px;
+  white-space: nowrap;
 }
 
 /* New Session: 38px bar, 12px radius (figma 133:7634 geometry, squared-off
diff --git a/packages/client/ui-sidebar/src/client/SidebarRoot.tsx b/packages/client/ui-sidebar/src/client/SidebarRoot.tsx
index 3fb2a68fd9..bdc5140b24 100644
--- a/packages/client/ui-sidebar/src/client/SidebarRoot.tsx
+++ b/packages/client/ui-sidebar/src/client/SidebarRoot.tsx
@@ -153,16 +153,17 @@ export function SidebarRoot({
               </span>
               <span className={css.brandName}>
                 {renderSlot('sidebar.brand.name', {}, {
-                  fallback: (
-                    <>
-                      <span className={css.fallbackBrandName}>
-                        {buildVersion === undefined ? 'DSH Local Build' : 'DSH'}
-                      </span>
-                      {buildVersion === undefined
-                        ? null
-                        : <span className={css.buildVersion}>{buildVersion}</span>}
-                    </>
-                  ),
+                  fallback: buildVersion === undefined
+                    ? <span className={css.fallbackBrandName}>DSH Local Build</span>
+                    : (
+                      <>
+                        <span className={css.localBuildBrand}>
+                          <span className={css.localBuildName}>DSH</span>
+                          <span className={css.localBuildLabel}>Local Build</span>
+                        </span>
+                        <span className={css.buildVersion}>{buildVersion}</span>
+                      </>
+                    ),
                 })}
               </span>
             </span>
diff --git a/packages/client/ui-sidebar/tests/__snapshots__/sidebar-snapshot.client.spec.tsx.snap b/packages/client/ui-sidebar/tests/__snapshots__/sidebar-snapshot.client.spec.tsx.snap
index 7780754125..929ce9d72a 100644
--- a/packages/client/ui-sidebar/tests/__snapshots__/sidebar-snapshot.client.spec.tsx.snap
+++ b/packages/client/ui-sidebar/tests/__snapshots__/sidebar-snapshot.client.spec.tsx.snap
@@ -138,9 +138,18 @@ exports[`sidebar shell snapshots > renders the expanded column (wordmark, capsul
               style="display: contents;"
             >
               <span
-                class="fallbackBrandName"
+                class="localBuildBrand"
               >
-                DSH
+                <span
+                  class="localBuildName"
+                >
+                  DSH
+                </span>
+                <span
+                  class="localBuildLabel"
+                >
+                  Local Build
+                </span>
               </span>
               <span
                 class="buildVersion"
@@ -264,9 +273,18 @@ exports[`sidebar shell snapshots > renders the expanded column in the default lo
               style="display: contents;"
             >
               <span
-                class="fallbackBrandName"
+                class="localBuildBrand"
               >
-                DSH
+                <span
+                  class="localBuildName"
+                >
+                  DSH
+                </span>
+                <span
+                  class="localBuildLabel"
+                >
+                  Local Build
+                </span>
               </span>
               <span
                 class="buildVersion"
diff --git a/packages/client/ui-sidebar/tests/sidebar-root.client.spec.tsx b/packages/client/ui-sidebar/tests/sidebar-root.client.spec.tsx
index 948bd28d2b..63812450a9 100644
--- a/packages/client/ui-sidebar/tests/sidebar-root.client.spec.tsx
+++ b/packages/client/ui-sidebar/tests/sidebar-root.client.spec.tsx
@@ -111,6 +111,7 @@ describe('SidebarRoot shell', () => {
     />)
 
     expect(screen.getByText('DSH')).toBeTruthy()
+    expect(screen.getByText('Local Build')).toBeTruthy()
     expect(screen.getByText('1.2.3-rc.4-0123456-dirty')).toBeTruthy()
     expect(container.querySelector('svg')).not.toBeNull()
   })
@@ -129,6 +130,7 @@ describe('SidebarRoot shell', () => {
     />)
 
     expect(screen.getByText('DSH')).toBeTruthy()
+    expect(screen.getByText('Local Build')).toBeTruthy()
     expect(screen.getByText(expected)).toBeTruthy()
   })