diff --git a/packages/desktop_ui/lib/desktop_ui/widgets/components.ex b/packages/desktop_ui/lib/desktop_ui/widgets/components.ex
index 0b8884e4..6ccf9fcc 100644
--- a/packages/desktop_ui/lib/desktop_ui/widgets/components.ex
+++ b/packages/desktop_ui/lib/desktop_ui/widgets/components.ex
@@ -16,7 +16,8 @@ defmodule DesktopUi.Widgets.Components do
   @form_control_kinds [
     :segmented_button_group,
     :runtime_form_shell,
-    :chat_composer
+    :chat_composer,
+    :mode_nav
   ]
 
   @row_artifact_kinds [:list_item_multi_column, :artifact_row]
@@ -25,13 +26,19 @@ defmodule DesktopUi.Widgets.Components do
     :pipeline_stepper_horizontal,
     :segmented_progress_bar,
     :workflow_stage_list_vertical,
-    :meter_thin
+    :meter_thin,
+    :unread_badge
   ]
 
   @layer_callout_kinds [
     :sticky_frosted_header,
     :slide_over_panel,
-    :event_callout
+    :event_callout,
+    :top_strip,
+    :sidebar_shell,
+    :sidebar_section,
+    :sidebar_item,
+    :command_palette
   ]
 
   @redline_code_kinds [:redline_inline, :code_block_syntax_highlighted]
@@ -55,6 +62,13 @@ defmodule DesktopUi.Widgets.Components do
     sticky_frosted_header: :layer_callout,
     slide_over_panel: :layer_callout,
     event_callout: :layer_callout,
+    top_strip: :layer_callout,
+    sidebar_shell: :layer_callout,
+    sidebar_section: :layer_callout,
+    sidebar_item: :layer_callout,
+    command_palette: :layer_callout,
+    mode_nav: :form_control,
+    unread_badge: :workflow_progress,
     redline_inline: :redline_code,
     code_block_syntax_highlighted: :redline_code,
     list_repeat: :composition_behavior
@@ -70,7 +84,10 @@ defmodule DesktopUi.Widgets.Components do
     :pipeline_stepper_horizontal,
     :workflow_stage_list_vertical,
     :slide_over_panel,
-    :event_callout
+    :event_callout,
+    :mode_nav,
+    :sidebar_item,
+    :command_palette
   ]
 
   @kinds @content_identity_kinds ++
@@ -532,6 +549,150 @@ defmodule DesktopUi.Widgets.Components do
     )
   end
 
+  @spec mode_nav(String.t() | atom(), [keyword() | map()], keyword() | map()) :: Widget.t()
+  def mode_nav(id, items, opts \\ []) when is_list(items) do
+    opts = options(opts)
+
+    component_widget(
+      :mode_nav,
+      id,
+      %{
+        navigation:
+          %{items: normalize_maps(items)}
+          |> maybe_put(:aria_label, option(opts, :aria_label))
+          |> maybe_put(:navigation_intent, option(opts, :navigation_intent))
+      },
+      [],
+      opts,
+      on_navigate: :navigation
+    )
+  end
+
+  @spec unread_badge(String.t() | atom(), non_neg_integer(), keyword() | map()) :: Widget.t()
+  def unread_badge(id, count, opts \\ []) when is_integer(count) and count >= 0 do
+    opts = options(opts)
+
+    component_widget(
+      :unread_badge,
+      id,
+      %{status: %{count: count, threshold: option(opts, :threshold, 99)}},
+      [],
+      opts
+    )
+  end
+
+  @spec top_strip(String.t() | atom(), [Widget.t() | map() | keyword()], keyword() | map()) ::
+          Widget.t()
+  def top_strip(id, children \\ [], opts \\ []) when is_list(children) do
+    opts = options(opts)
+
+    component_widget(
+      :top_strip,
+      id,
+      %{
+        shell: %{
+          position: :top,
+          brand: option(opts, :brand, ""),
+          context: option(opts, :context, ""),
+          theme: option(opts, :theme, :light),
+          pane_open?: option(opts, :pane_open?, false)
+        }
+      },
+      children,
+      opts
+    )
+  end
+
+  @spec sidebar_shell(String.t() | atom(), [Widget.t() | map() | keyword()], keyword() | map()) ::
+          Widget.t()
+  def sidebar_shell(id, children \\ [], opts \\ []) when is_list(children) do
+    opts = options(opts)
+
+    component_widget(
+      :sidebar_shell,
+      id,
+      %{shell: %{position: :side, collapsed?: option(opts, :collapsed?, false)}},
+      children,
+      opts
+    )
+  end
+
+  @spec sidebar_section(
+          String.t() | atom(),
+          String.t(),
+          [Widget.t() | map() | keyword()],
+          keyword() | map()
+        ) :: Widget.t()
+  def sidebar_section(id, label, children \\ [], opts \\ [])
+      when is_binary(label) and is_list(children) do
+    opts = options(opts)
+
+    component_widget(
+      :sidebar_section,
+      id,
+      %{
+        section:
+          %{label: label}
+          |> maybe_put(:action_glyph, option(opts, :action_glyph))
+          |> maybe_put(:action_label, option(opts, :action_label))
+          |> maybe_put(:action_intent, option(opts, :action_intent))
+      },
+      children,
+      opts
+    )
+  end
+
+  @spec sidebar_item(
+          String.t() | atom(),
+          String.t(),
+          [Widget.t() | map() | keyword()],
+          keyword() | map()
+        ) :: Widget.t()
+  def sidebar_item(id, label, children \\ [], opts \\ [])
+      when is_binary(label) and is_list(children) do
+    opts = options(opts)
+
+    component_widget(
+      :sidebar_item,
+      id,
+      %{
+        item:
+          %{label: label, selected?: option(opts, :selected?, false)}
+          |> maybe_put(:item_intent, option(opts, :item_intent))
+      },
+      children,
+      opts,
+      on_select: :selection,
+      on_click: :click
+    )
+  end
+
+  @spec command_palette(
+          String.t() | atom(),
+          [keyword() | map()],
+          [Widget.t() | map() | keyword()],
+          keyword() | map()
+        ) :: Widget.t()
+  def command_palette(id, items \\ [], children \\ [], opts \\ [])
+      when is_list(items) and is_list(children) do
+    opts = options(opts)
+
+    component_widget(
+      :command_palette,
+      id,
+      %{
+        palette:
+          %{open?: option(opts, :open?, false), items: normalize_maps(items)}
+          |> maybe_put(:filter_intent, option(opts, :filter_intent))
+          |> maybe_put(:select_intent, option(opts, :select_intent))
+      },
+      children,
+      opts,
+      on_filter: :filter,
+      on_select: :select
+    )
+  end
+
   @spec from_iur(atom(), String.t() | atom(), map(), keyword() | map()) :: Widget.t()
   def from_iur(kind, id, attributes, opts \\ []) when is_atom(kind) and is_map(attributes) do
     opts = options(opts)
diff --git a/packages/desktop_ui/test/desktop_ui/phase_eleven_integration_test.exs b/packages/desktop_ui/test/desktop_ui/phase_eleven_integration_test.exs
index ebde1a59..7197b27e 100644
--- a/packages/desktop_ui/test/desktop_ui/phase_eleven_integration_test.exs
+++ b/packages/desktop_ui/test/desktop_ui/phase_eleven_integration_test.exs
@@ -8,7 +8,7 @@ defmodule DesktopUi.PhaseElevenIntegrationTest do
 
   @moduletag :phase_eleven
 
-  @iur_widget_count 77
+  @iur_widget_count 83
 
   @all_iur_kinds MapSet.new([
                    # Foundational (13)
@@ -77,7 +77,7 @@ defmodule DesktopUi.PhaseElevenIntegrationTest do
                    :stack,
                    # Container (1)
                    :window,
-                   # Canonical widget components (20)
+                   # Canonical widget components (27)
                    :inline_rich_text_heading,
                    :disclosure,
                    :kicker,
@@ -86,15 +86,22 @@ defmodule DesktopUi.PhaseElevenIntegrationTest do
                    :segmented_button_group,
                    :runtime_form_shell,
                    :chat_composer,
+                   :mode_nav,
                    :list_item_multi_column,
                    :artifact_row,
                    :pipeline_stepper_horizontal,
                    :segmented_progress_bar,
                    :workflow_stage_list_vertical,
                    :meter_thin,
+                   :unread_badge,
                    :sticky_frosted_header,
                    :slide_over_panel,
                    :event_callout,
+                   :top_strip,
+                   :sidebar_shell,
+                   :sidebar_section,
+                   :sidebar_item,
+                   :command_palette,
                    :redline_inline,
                    :code_block_syntax_highlighted,
                    :list_repeat
diff --git a/packages/elm_ui/lib/elm_ui/widgets/components.ex b/packages/elm_ui/lib/elm_ui/widgets/components.ex
index ea703584..014be66a 100644
--- a/packages/elm_ui/lib/elm_ui/widgets/components.ex
+++ b/packages/elm_ui/lib/elm_ui/widgets/components.ex
@@ -19,7 +19,8 @@ defmodule ElmUi.Widgets.Components do
   @form_control_kinds [
     :segmented_button_group,
     :runtime_form_shell,
-    :chat_composer
+    :chat_composer,
+    :mode_nav
   ]
 
   @row_artifact_kinds [
@@ -31,13 +32,19 @@ defmodule ElmUi.Widgets.Components do
     :pipeline_stepper_horizontal,
     :segmented_progress_bar,
     :workflow_stage_list_vertical,
-    :meter_thin
+    :meter_thin,
+    :unread_badge
   ]
 
   @layer_callout_kinds [
     :sticky_frosted_header,
     :slide_over_panel,
-    :event_callout
+    :event_callout,
+    :top_strip,
+    :sidebar_shell,
+    :sidebar_section,
+    :sidebar_item,
+    :command_palette
   ]
 
   @redline_code_kinds [
@@ -67,6 +74,13 @@ defmodule ElmUi.Widgets.Components do
     sticky_frosted_header: :layer_callout,
     slide_over_panel: :layer_callout,
     event_callout: :layer_callout,
+    top_strip: :layer_callout,
+    sidebar_shell: :layer_callout,
+    sidebar_section: :layer_callout,
+    sidebar_item: :layer_callout,
+    command_palette: :layer_callout,
+    mode_nav: :form_control,
+    unread_badge: :workflow_progress,
     redline_inline: :redline_code,
     code_block_syntax_highlighted: :redline_code,
     list_repeat: :composition_behavior
@@ -590,6 +604,162 @@ defmodule ElmUi.Widgets.Components do
     )
   end
 
+  @spec mode_nav(String.t() | atom(), [keyword() | map()], keyword() | map()) :: ElmUi.Widget.t()
+  def mode_nav(id, items, opts \\ []) when is_list(items) do
+    opts = options(opts)
+
+    component_widget(
+      :mode_nav,
+      id,
+      %{
+        navigation:
+          %{items: normalize_maps(items)}
+          |> maybe_put(:aria_label, Builder.option(opts, :aria_label))
+          |> maybe_put(:navigation_intent, Builder.option(opts, :navigation_intent))
+      },
+      [],
+      opts,
+      on_navigate: :navigation
+    )
+  end
+
+  @spec unread_badge(String.t() | atom(), non_neg_integer(), keyword() | map()) ::
+          ElmUi.Widget.t()
+  def unread_badge(id, count, opts \\ []) when is_integer(count) and count >= 0 do
+    opts = options(opts)
+
+    component_widget(
+      :unread_badge,
+      id,
+      %{
+        status: %{
+          count: count,
+          threshold: Builder.option(opts, :threshold, 99)
+        }
+      },
+      [],
+      opts
+    )
+  end
+
+  @spec top_strip(
+          String.t() | atom(),
+          [ElmUi.Widget.t() | map() | keyword()],
+          keyword() | map()
+        ) :: ElmUi.Widget.t()
+  def top_strip(id, children \\ [], opts \\ []) when is_list(children) do
+    opts = options(opts)
+
+    component_widget(
+      :top_strip,
+      id,
+      %{
+        shell: %{
+          position: :top,
+          brand: Builder.option(opts, :brand, ""),
+          context: Builder.option(opts, :context, ""),
+          theme: Builder.option(opts, :theme, :light),
+          pane_open?: Builder.option(opts, :pane_open?, false)
+        }
+      },
+      children,
+      opts
+    )
+  end
+
+  @spec sidebar_shell(
+          String.t() | atom(),
+          [ElmUi.Widget.t() | map() | keyword()],
+          keyword() | map()
+        ) :: ElmUi.Widget.t()
+  def sidebar_shell(id, children \\ [], opts \\ []) when is_list(children) do
+    opts = options(opts)
+
+    component_widget(
+      :sidebar_shell,
+      id,
+      %{shell: %{position: :side, collapsed?: Builder.option(opts, :collapsed?, false)}},
+      children,
+      opts
+    )
+  end
+
+  @spec sidebar_section(
+          String.t() | atom(),
+          String.t(),
+          [ElmUi.Widget.t() | map() | keyword()],
+          keyword() | map()
+        ) :: ElmUi.Widget.t()
+  def sidebar_section(id, label, children \\ [], opts \\ [])
+      when is_binary(label) and is_list(children) do
+    opts = options(opts)
+
+    component_widget(
+      :sidebar_section,
+      id,
+      %{
+        section:
+          %{label: label}
+          |> maybe_put(:action_glyph, Builder.option(opts, :action_glyph))
+          |> maybe_put(:action_label, Builder.option(opts, :action_label))
+          |> maybe_put(:action_intent, Builder.option(opts, :action_intent))
+      },
+      children,
+      opts
+    )
+  end
+
+  @spec sidebar_item(
+          String.t() | atom(),
+          String.t(),
+          [ElmUi.Widget.t() | map() | keyword()],
+          keyword() | map()
+        ) :: ElmUi.Widget.t()
+  def sidebar_item(id, label, children \\ [], opts \\ [])
+      when is_binary(label) and is_list(children) do
+    opts = options(opts)
+
+    component_widget(
+      :sidebar_item,
+      id,
+      %{
+        item:
+          %{label: label, selected?: Builder.option(opts, :selected?, false)}
+          |> maybe_put(:item_intent, Builder.option(opts, :item_intent))
+      },
+      children,
+      opts,
+      on_select: :selection,
+      on_click: :click
+    )
+  end
+
+  @spec command_palette(
+          String.t() | atom(),
+          [keyword() | map()],
+          [ElmUi.Widget.t() | map() | keyword()],
+          keyword() | map()
+        ) :: ElmUi.Widget.t()
+  def command_palette(id, items \\ [], children \\ [], opts \\ [])
+      when is_list(items) and is_list(children) do
+    opts = options(opts)
+
+    component_widget(
+      :command_palette,
+      id,
+      %{
+        palette:
+          %{open?: Builder.option(opts, :open?, false), items: normalize_maps(items)}
+          |> maybe_put(:filter_intent, Builder.option(opts, :filter_intent))
+          |> maybe_put(:select_intent, Builder.option(opts, :select_intent))
+      },
+      children,
+      opts,
+      on_filter: :filter,
+      on_select: :select
+    )
+  end
+
   @spec from_iur(
           atom(),
           String.t() | atom() | nil,
diff --git a/packages/live_ui/lib/live_ui/renderer.ex b/packages/live_ui/lib/live_ui/renderer.ex
index 27d05339..764c5ab9 100644
--- a/packages/live_ui/lib/live_ui/renderer.ex
+++ b/packages/live_ui/lib/live_ui/renderer.ex
@@ -578,7 +578,11 @@ defmodule LiveUi.Renderer do
     """
   end
 
-  def render(%{element: %Element{kind: :command_palette}} = assigns) do
+  def render(
+        %{
+          element: %Element{kind: :command_palette, attributes: %{command_palette: _}}
+        } = assigns
+      ) do
     assigns =
       assigns
       |> assign(
@@ -1480,6 +1484,172 @@ defmodule LiveUi.Renderer do
     """
   end
 
+  def render(%{element: %Element{kind: :top_strip}} = assigns) do
+    assigns = assign(assigns, :style_attrs, style_rest(assigns.element))
+
+    ~H"""
+    <LiveUi.Widgets.Components.TopStrip.component
+      id={element_id(@element, "top-strip")}
+      brand={string_value(get_in(@element.attributes, [:shell, :brand]), "")}
+      context={string_value(get_in(@element.attributes, [:shell, :context]), "")}
+      theme={string_value(get_in(@element.attributes, [:shell, :theme]), "light")}
+      pane_open={boolean_default(get_in(@element.attributes, [:shell, :pane_open?]), false)}
+      tone={style_tone(@element)}
+      variant={theme_variant(@element)}
+      state={style_state(@element)}
+      class={style_class(@element)}
+      {@style_attrs}
+    >
+      <%= for child <- child_elements(@element) do %>
+        <.render element={child} event_target={@event_target} />
+      <% end %>
+    </LiveUi.Widgets.Components.TopStrip.component>
+    """
+  end
+
+  def render(%{element: %Element{kind: :mode_nav}} = assigns) do
+    assigns =
+      assign(
+        assigns,
+        :nav_attrs,
+        interaction_event_attrs(assigns.element, Map.get(assigns, :event_target))
+      )
+
+    ~H"""
+    <LiveUi.Widgets.Components.ModeNav.component
+      id={element_id(@element, "mode-nav")}
+      items={get_in(@element.attributes, [:navigation, :items]) || []}
+      aria_label={string_optional(get_in(@element.attributes, [:navigation, :aria_label]))}
+      nav_attrs={@nav_attrs}
+      tone={style_tone(@element)}
+      variant={theme_variant(@element)}
+      state={style_state(@element)}
+      class={style_class(@element)}
+    />
+    """
+  end
+
+  def render(%{element: %Element{kind: :sidebar_shell}} = assigns) do
+    assigns = assign(assigns, :style_attrs, style_rest(assigns.element))
+
+    ~H"""
+    <LiveUi.Widgets.Components.SidebarShell.component
+      id={element_id(@element, "sidebar-shell")}
+      collapsed={boolean_default(get_in(@element.attributes, [:shell, :collapsed?]), false)}
+      tone={style_tone(@element)}
+      variant={theme_variant(@element)}
+      state={style_state(@element)}
+      class={style_class(@element)}
+      {@style_attrs}
+    >
+      <%= for child <- child_elements(@element) do %>
+        <.render element={child} event_target={@event_target} />
+      <% end %>
+    </LiveUi.Widgets.Components.SidebarShell.component>
+    """
+  end
+
+  def render(%{element: %Element{kind: :sidebar_section}} = assigns) do
+    assigns =
+      assign(
+        assigns,
+        :action_attrs,
+        interaction_event_attrs(assigns.element, Map.get(assigns, :event_target))
+      )
+
+    ~H"""
+    <LiveUi.Widgets.Components.SidebarSection.component
+      id={element_id(@element, "sidebar-section")}
+      label={string_value(get_in(@element.attributes, [:section, :label]), "")}
+      action_glyph={string_optional(get_in(@element.attributes, [:section, :action_glyph]))}
+      action_label={string_optional(get_in(@element.attributes, [:section, :action_label]))}
+      action_attrs={@action_attrs}
+      tone={style_tone(@element)}
+      variant={theme_variant(@element)}
+      state={style_state(@element)}
+      class={style_class(@element)}
+    >
+      <%= for child <- child_elements(@element) do %>
+        <.render element={child} event_target={@event_target} />
+      <% end %>
+    </LiveUi.Widgets.Components.SidebarSection.component>
+    """
+  end
+
+  def render(%{element: %Element{kind: :sidebar_item}} = assigns) do
+    assigns =
+      assign(
+        assigns,
+        :item_attrs,
+        interaction_event_attrs(assigns.element, Map.get(assigns, :event_target))
+      )
+
+    ~H"""
+    <LiveUi.Widgets.Components.SidebarItem.component
+      id={element_id(@element, "sidebar-item")}
+      label={string_value(get_in(@element.attributes, [:item, :label]), "")}
+      selected={boolean_default(get_in(@element.attributes, [:item, :selected?]), false)}
+      item_attrs={@item_attrs}
+      tone={style_tone(@element)}
+      variant={theme_variant(@element)}
+      state={style_state(@element)}
+      class={style_class(@element)}
+    >
+      <%= for child <- child_elements(@element) do %>
+        <.render element={child} event_target={@event_target} />
+      <% end %>
+    </LiveUi.Widgets.Components.SidebarItem.component>
+    """
+  end
+
+  def render(%{element: %Element{kind: :unread_badge}} = assigns) do
+    ~H"""
+    <LiveUi.Widgets.Components.UnreadBadge.component
+      id={element_id(@element, "unread-badge")}
+      count={integer_value(get_in(@element.attributes, [:status, :count]), 0)}
+      threshold={integer_value(get_in(@element.attributes, [:status, :threshold]), 99)}
+      tone={style_tone(@element)}
+      variant={theme_variant(@element)}
+      state={style_state(@element)}
+      class={style_class(@element)}
+    />
+    """
+  end
+
+  def render(
+        %{element: %Element{kind: :command_palette, attributes: %{component: %{family: _}}}} =
+          assigns
+      ) do
+    assigns =
+      assigns
+      |> assign(
+        :filter_attrs,
+        direct_change_interaction_attrs(assigns.element, Map.get(assigns, :event_target))
+      )
+      |> assign(
+        :select_attrs,
+        interaction_event_attrs(assigns.element, Map.get(assigns, :event_target))
+      )
+
+    ~H"""
+    <LiveUi.Widgets.Components.CommandPalette.component
+      id={element_id(@element, "command-palette")}
+      open={boolean_default(get_in(@element.attributes, [:palette, :open?]), false)}
+      items={get_in(@element.attributes, [:palette, :items]) || []}
+      filter_attrs={@filter_attrs}
+      select_attrs={@select_attrs}
+      tone={style_tone(@element)}
+      variant={theme_variant(@element)}
+      state={style_state(@element)}
+      class={style_class(@element)}
+    >
+      <%= for child <- child_elements(@element) do %>
+        <.render element={child} event_target={@event_target} />
+      <% end %>
+    </LiveUi.Widgets.Components.CommandPalette.component>
+    """
+  end
+
   def render(assigns) do
     ~H"""
     <div id={element_id(@element, "unsupported")} data-live-ui-widget="unsupported" data-live-ui-kind={to_string(@element.kind)}>
diff --git a/packages/live_ui/lib/live_ui/widgets/components.ex b/packages/live_ui/lib/live_ui/widgets/components.ex
index dbe87b8a..cc1cb186 100644
--- a/packages/live_ui/lib/live_ui/widgets/components.ex
+++ b/packages/live_ui/lib/live_ui/widgets/components.ex
@@ -32,7 +32,8 @@ defmodule LiveUi.Widgets.Components do
   @form_control_modules [
     LiveUi.Widgets.Components.SegmentedButtonGroup,
     LiveUi.Widgets.Components.RuntimeFormShell,
-    LiveUi.Widgets.Components.ChatComposer
+    LiveUi.Widgets.Components.ChatComposer,
+    LiveUi.Widgets.Components.ModeNav
   ]
 
   @row_artifact_modules [
@@ -44,13 +45,19 @@ defmodule LiveUi.Widgets.Components do
     LiveUi.Widgets.Components.PipelineStepperHorizontal,
     LiveUi.Widgets.Components.SegmentedProgressBar,
     LiveUi.Widgets.Components.WorkflowStageListVertical,
-    LiveUi.Widgets.Components.MeterThin
+    LiveUi.Widgets.Components.MeterThin,
+    LiveUi.Widgets.Components.UnreadBadge
   ]
 
   @layer_callout_modules [
     LiveUi.Widgets.Components.StickyFrostedHeader,
     LiveUi.Widgets.Components.SlideOverPanel,
-    LiveUi.Widgets.Components.EventCallout
+    LiveUi.Widgets.Components.EventCallout,
+    LiveUi.Widgets.Components.TopStrip,
+    LiveUi.Widgets.Components.SidebarShell,
+    LiveUi.Widgets.Components.SidebarSection,
+    LiveUi.Widgets.Components.SidebarItem,
+    LiveUi.Widgets.Components.CommandPalette
   ]
 
   @redline_code_modules [
@@ -232,6 +239,62 @@ defmodule LiveUi.Widgets.Components do
       slots: [:inner_block],
       events: [],
       local_state_keys: []
+    },
+    mode_nav: %{
+      module: LiveUi.Widgets.Components.ModeNav,
+      family: :form_control,
+      assigns: [:items, :aria_label, :nav_attrs],
+      slots: [],
+      events: [:navigation],
+      local_state_keys: []
+    },
+    unread_badge: %{
+      module: LiveUi.Widgets.Components.UnreadBadge,
+      family: :workflow_progress,
+      assigns: [:count, :threshold],
+      slots: [],
+      events: [],
+      local_state_keys: []
+    },
+    top_strip: %{
+      module: LiveUi.Widgets.Components.TopStrip,
+      family: :layer_callout,
+      assigns: [:brand, :context, :theme, :pane_open],
+      slots: [:inner_block],
+      events: [],
+      local_state_keys: []
+    },
+    sidebar_shell: %{
+      module: LiveUi.Widgets.Components.SidebarShell,
+      family: :layer_callout,
+      assigns: [:collapsed],
+      slots: [:inner_block],
+      events: [],
+      local_state_keys: []
+    },
+    sidebar_section: %{
+      module: LiveUi.Widgets.Components.SidebarSection,
+      family: :layer_callout,
+      assigns: [:label, :action_glyph, :action_label, :action_attrs],
+      slots: [:inner_block],
+      events: [],
+      local_state_keys: []
+    },
+    sidebar_item: %{
+      module: LiveUi.Widgets.Components.SidebarItem,
+      family: :layer_callout,
+      assigns: [:label, :selected, :item_attrs],
+      slots: [:inner_block],
+      events: [],
+      local_state_keys: []
+    },
+    command_palette: %{
+      module: LiveUi.Widgets.Components.CommandPalette,
+      family: :layer_callout,
+      assigns: [:open, :items, :filter_attrs, :select_attrs],
+      slots: [:inner_block],
+      events: [:filter, :select],
+      local_state_keys: []
     }
   }
 
diff --git a/packages/live_ui/lib/live_ui/widgets/components/form_control.ex b/packages/live_ui/lib/live_ui/widgets/components/form_control.ex
index 6786b345..6da96078 100644
--- a/packages/live_ui/lib/live_ui/widgets/components/form_control.ex
+++ b/packages/live_ui/lib/live_ui/widgets/components/form_control.ex
@@ -102,6 +102,55 @@ defmodule LiveUi.Widgets.Components.RuntimeFormShell do
   end
 end
 
+defmodule LiveUi.Widgets.Components.ModeNav do
+  @moduledoc """
+  Native navigation control for switching application modes with labeled items and shortcuts.
+  """
+
+  alias LiveUi.Widgets.Components.Support
+
+  use LiveUi.Component,
+    family: :components,
+    name: :mode_nav,
+    assigns: [:items, :aria_label, :nav_attrs],
+    events: [:navigation]
+
+  LiveUi.Component.common_attrs()
+  attr(:items, :list, default: [])
+  attr(:aria_label, :string, default: nil)
+  attr(:nav_attrs, :map, default: %{})
+
+  @impl true
+  def render(assigns) do
+    assigns =
+      assign(
+        assigns,
+        :component_attrs,
+        Support.component_attrs(assigns, :mode_nav, :form_control)
+      )
+
+    ~H"""
+    <nav
+      id={@id}
+      role="navigation"
+      aria-label={@aria_label}
+      class={@class}
+      {@component_attrs}
+      {@nav_attrs}
+    >
+      <button
+        :for={item <- @items}
+        type="button"
+        aria-current={if Support.fetch(item, :current?, false), do: "page", else: "false"}
+        data-live-ui-nav-value={Support.text(Support.fetch(item, :value))}
+        data-live-ui-nav-shortcut={Support.text(Support.fetch(item, :shortcut))}
+        {Support.attrs(item)}
+      ><%= Support.label(item) %></button>
+    </nav>
+    """
+  end
+end
+
 defmodule LiveUi.Widgets.Components.ChatComposer do
   @moduledoc """
   Native chat composer with message text and tool slots.
diff --git a/packages/live_ui/lib/live_ui/widgets/components/layer_text.ex b/packages/live_ui/lib/live_ui/widgets/components/layer_text.ex
index 7b5ee6f7..21618c31 100644
--- a/packages/live_ui/lib/live_ui/widgets/components/layer_text.ex
+++ b/packages/live_ui/lib/live_ui/widgets/components/layer_text.ex
@@ -210,6 +210,239 @@ defmodule LiveUi.Widgets.Components.CodeBlockSyntaxHighlighted do
   end
 end
 
+defmodule LiveUi.Widgets.Components.TopStrip do
+  @moduledoc """
+  Native top shell strip with brand identity, context, theme controls, and mode navigation.
+  """
+
+  alias LiveUi.Widgets.Components.Support
+
+  use LiveUi.Component,
+    family: :components,
+    name: :top_strip,
+    slots: [:inner_block],
+    assigns: [:brand, :context, :theme, :pane_open]
+
+  LiveUi.Component.common_attrs()
+  attr(:brand, :string, default: "")
+  attr(:context, :string, default: "")
+  attr(:theme, :string, default: "light")
+  attr(:pane_open, :boolean, default: false)
+  slot(:inner_block)
+
+  @impl true
+  def render(assigns) do
+    assigns =
+      assign(
+        assigns,
+        :component_attrs,
+        Support.component_attrs(assigns, :top_strip, :layer_callout, %{
+          "data-live-ui-shell-position" => "top",
+          "data-live-ui-theme" => assigns.theme,
+          "data-live-ui-pane-open" => assigns.pane_open
+        })
+      )
+
+    ~H"""
+    <header id={@id} class={@class} {@component_attrs}>
+      <span :if={@brand != ""} data-live-ui-strip-brand><%= @brand %></span>
+      <span :if={@context != ""} data-live-ui-strip-context><%= @context %></span>
+      <div data-live-ui-strip-nav><%= render_slot(@inner_block) %></div>
+    </header>
+    """
+  end
+end
+
+defmodule LiveUi.Widgets.Components.SidebarShell do
+  @moduledoc """
+  Native side navigation shell with collapsible state and section children.
+  """
+
+  alias LiveUi.Widgets.Components.Support
+
+  use LiveUi.Component,
+    family: :components,
+    name: :sidebar_shell,
+    slots: [:inner_block],
+    assigns: [:collapsed]
+
+  LiveUi.Component.common_attrs()
+  attr(:collapsed, :boolean, default: false)
+  slot(:inner_block)
+
+  @impl true
+  def render(assigns) do
+    assigns =
+      assign(
+        assigns,
+        :component_attrs,
+        Support.component_attrs(assigns, :sidebar_shell, :layer_callout, %{
+          "data-live-ui-shell-position" => "side",
+          "data-live-ui-collapsed" => assigns.collapsed
+        })
+      )
+
+    ~H"""
+    <nav id={@id} class={@class} aria-hidden={if @collapsed, do: "true", else: "false"} {@component_attrs}>
+      <%= render_slot(@inner_block) %>
+    </nav>
+    """
+  end
+end
+
+defmodule LiveUi.Widgets.Components.SidebarSection do
+  @moduledoc """
+  Native labeled section group inside a sidebar shell with optional action and item children.
+  """
+
+  alias LiveUi.Widgets.Components.Support
+
+  use LiveUi.Component,
+    family: :components,
+    name: :sidebar_section,
+    slots: [:inner_block],
+    assigns: [:label, :action_glyph, :action_label, :action_attrs]
+
+  LiveUi.Component.common_attrs()
+  attr(:label, :string, required: true)
+  attr(:action_glyph, :string, default: nil)
+  attr(:action_label, :string, default: nil)
+  attr(:action_attrs, :map, default: %{})
+  slot(:inner_block)
+
+  @impl true
+  def render(assigns) do
+    assigns =
+      assign(
+        assigns,
+        :component_attrs,
+        Support.component_attrs(assigns, :sidebar_section, :layer_callout)
+      )
+
+    ~H"""
+    <section id={@id} class={@class} data-live-ui-shell-section="" {@component_attrs}>
+      <header data-live-ui-section-header="">
+        <span><%= @label %></span>
+        <button
+          :if={@action_label}
+          type="button"
+          data-live-ui-section-action=""
+          aria-label={@action_label}
+          {@action_attrs}
+        ><%= if @action_glyph, do: @action_glyph, else: @action_label %></button>
+      </header>
+      <ul data-live-ui-section-items=""><%= render_slot(@inner_block) %></ul>
+    </section>
+    """
+  end
+end
+
+defmodule LiveUi.Widgets.Components.SidebarItem do
+  @moduledoc """
+  Native navigable sidebar item with selected state, intent, and optional badge children.
+  """
+
+  alias LiveUi.Widgets.Components.Support
+
+  use LiveUi.Component,
+    family: :components,
+    name: :sidebar_item,
+    slots: [:inner_block],
+    assigns: [:label, :selected, :item_attrs]
+
+  LiveUi.Component.common_attrs()
+  attr(:label, :string, required: true)
+  attr(:selected, :boolean, default: false)
+  attr(:item_attrs, :map, default: %{})
+  slot(:inner_block)
+
+  @impl true
+  def render(assigns) do
+    assigns =
+      assign(
+        assigns,
+        :component_attrs,
+        Support.component_attrs(assigns, :sidebar_item, :layer_callout, %{
+          "data-live-ui-selected" => assigns.selected
+        })
+      )
+
+    ~H"""
+    <li id={@id} class={@class} data-live-ui-shell-item="" {@component_attrs}>
+      <button
+        type="button"
+        aria-current={if @selected, do: "page", else: "false"}
+        {@item_attrs}
+      >
+        <span><%= @label %></span>
+        <%= render_slot(@inner_block) %>
+      </button>
+    </li>
+    """
+  end
+end
+
+defmodule LiveUi.Widgets.Components.CommandPalette do
+  @moduledoc """
+  Native keyboard-driven command palette overlay with open state, filterable items, and children.
+  """
+
+  alias LiveUi.Widgets.Components.Support
+
+  use LiveUi.Component,
+    family: :components,
+    name: :command_palette,
+    slots: [:inner_block],
+    assigns: [:open, :items, :filter_attrs, :select_attrs],
+    events: [:filter, :select]
+
+  LiveUi.Component.common_attrs()
+  attr(:open, :boolean, default: false)
+  attr(:items, :list, default: [])
+  attr(:filter_attrs, :map, default: %{})
+  attr(:select_attrs, :map, default: %{})
+  slot(:inner_block)
+
+  @impl true
+  def render(assigns) do
+    assigns =
+      assign(
+        assigns,
+        :component_attrs,
+        Support.component_attrs(assigns, :command_palette, :layer_callout, %{
+          "data-live-ui-palette-open" => assigns.open
+        })
+      )
+
+    ~H"""
+    <aside
+      id={@id}
+      role="dialog"
+      aria-modal="true"
+      aria-hidden={if @open, do: "false", else: "true"}
+      class={@class}
+      {@component_attrs}
+    >
+      <input
+        type="search"
+        data-live-ui-palette-input=""
+        aria-label="Command filter"
+        {@filter_attrs}
+      />
+      <ul data-live-ui-palette-items="">
+        <li
+          :for={item <- @items}
+          data-live-ui-palette-item={Support.text(Support.fetch(item, :id))}
+          data-live-ui-palette-active={Support.fetch(item, :active, false)}
+          {Map.merge(@select_attrs, Support.attrs(item))}
+        ><%= Support.label(item) %></li>
+      </ul>
+      <%= render_slot(@inner_block) %>
+    </aside>
+    """
+  end
+end
+
 defmodule LiveUi.Widgets.Components.ListRepeat do
   @moduledoc """
   Native wrapper for already-hydrated list-repeat child output.
diff --git a/packages/live_ui/lib/live_ui/widgets/components/row_workflow.ex b/packages/live_ui/lib/live_ui/widgets/components/row_workflow.ex
index 17bfb480..677a97e7 100644
--- a/packages/live_ui/lib/live_ui/widgets/components/row_workflow.ex
+++ b/packages/live_ui/lib/live_ui/widgets/components/row_workflow.ex
@@ -295,3 +295,47 @@ defmodule LiveUi.Widgets.Components.MeterThin do
     """
   end
 end
+
+defmodule LiveUi.Widgets.Components.UnreadBadge do
+  @moduledoc """
+  Native compact unread count badge with threshold capping and hidden-when-zero behavior.
+  """
+
+  alias LiveUi.Widgets.Components.Support
+
+  use LiveUi.Component,
+    family: :components,
+    name: :unread_badge,
+    assigns: [:count, :threshold]
+
+  LiveUi.Component.common_attrs()
+  attr(:count, :integer, default: 0)
+  attr(:threshold, :integer, default: 99)
+
+  @impl true
+  def render(assigns) do
+    assigns =
+      assigns
+      |> assign(:display_count, display_count(assigns.count, assigns.threshold))
+      |> assign(
+        :component_attrs,
+        Support.component_attrs(assigns, :unread_badge, :workflow_progress, %{
+          "data-live-ui-unread-count" => assigns.count
+        })
+      )
+
+    ~H"""
+    <span
+      :if={@count > 0}
+      id={@id}
+      role="status"
+      aria-label={"#{@count} unread"}
+      class={@class}
+      {@component_attrs}
+    ><%= @display_count %></span>
+    """
+  end
+
+  defp display_count(count, threshold) when count > threshold, do: "#{threshold}+"
+  defp display_count(count, _threshold), do: to_string(count)
+end
diff --git a/packages/live_ui/test/live_ui/widget_components_shell_primitives_test.exs b/packages/live_ui/test/live_ui/widget_components_shell_primitives_test.exs
new file mode 100644
index 00000000..87004099
--- /dev/null
+++ b/packages/live_ui/test/live_ui/widget_components_shell_primitives_test.exs
@@ -0,0 +1,235 @@
+defmodule LiveUi.WidgetComponentsShellPrimitivesTest do
+  use ExUnit.Case, async: true
+
+  import Phoenix.LiveViewTest
+
+  defp slot_text(slot, text) do
+    %{__slot__: slot, inner_block: fn _, _ -> text end}
+  end
+
+  test "top_strip renders shell header with brand, context, and theme attrs" do
+    html =
+      render_component(&LiveUi.Widgets.Components.TopStrip.component/1, %{
+        id: "top-strip",
+        brand: "Ariston",
+        context: "Workspace",
+        theme: "dark",
+        pane_open: false,
+        inner_block: [slot_text(:inner_block, "nav-content")]
+      })
+
+    assert html =~ ~s(data-live-ui-shell-position="top")
+    assert html =~ ~s(data-live-ui-theme="dark")
+    assert html =~ "Ariston"
+    assert html =~ "Workspace"
+    assert html =~ "nav-content"
+  end
+
+  test "top_strip omits brand span when brand is empty" do
+    html =
+      render_component(&LiveUi.Widgets.Components.TopStrip.component/1, %{
+        id: "strip-no-brand",
+        brand: "",
+        pane_open: false,
+        inner_block: [slot_text(:inner_block, "")]
+      })
+
+    refute html =~ "data-live-ui-strip-brand"
+  end
+
+  test "mode_nav renders navigation with item labels and current state" do
+    html =
+      render_component(&LiveUi.Widgets.Components.ModeNav.component/1, %{
+        id: "mode-nav",
+        aria_label: "App modes",
+        items: [
+          %{value: "workspace", label: "Workspace", current?: true},
+          %{value: "map", label: "Map", shortcut: "m"}
+        ]
+      })
+
+    assert html =~ ~s(role="navigation")
+    assert html =~ ~s(aria-label="App modes")
+    assert html =~ ~s(data-live-ui-nav-value="workspace")
+    assert html =~ ~s(aria-current="page")
+    assert html =~ "Workspace"
+    assert html =~ "Map"
+    assert html =~ ~s(data-live-ui-nav-shortcut="m")
+  end
+
+  test "mode_nav item without current? has aria-current false" do
+    html =
+      render_component(&LiveUi.Widgets.Components.ModeNav.component/1, %{
+        id: "mode-nav-2",
+        items: [%{value: "docs", label: "Docs"}]
+      })
+
+    assert html =~ ~s(aria-current="false")
+    refute html =~ ~s(aria-current="page")
+  end
+
+  test "sidebar_shell renders nav with collapsed data attribute" do
+    html =
+      render_component(&LiveUi.Widgets.Components.SidebarShell.component/1, %{
+        id: "sidebar",
+        collapsed: true,
+        inner_block: [slot_text(:inner_block, "sections")]
+      })
+
+    assert html =~ ~s(data-live-ui-shell-position="side")
+    assert html =~ ~s(data-live-ui-collapsed="true")
+    assert html =~ ~s(aria-hidden="true")
+    assert html =~ "sections"
+  end
+
+  test "sidebar_shell when expanded has aria-hidden false" do
+    html =
+      render_component(&LiveUi.Widgets.Components.SidebarShell.component/1, %{
+        id: "sidebar-open",
+        collapsed: false,
+        inner_block: [slot_text(:inner_block, "")]
+      })
+
+    assert html =~ ~s(aria-hidden="false")
+  end
+
+  test "sidebar_section renders labeled section with action button" do
+    html =
+      render_component(&LiveUi.Widgets.Components.SidebarSection.component/1, %{
+        id: "section",
+        label: "Specs",
+        action_label: "Add spec",
+        action_glyph: "+",
+        action_attrs: %{"phx-click" => "add_spec"},
+        inner_block: [slot_text(:inner_block, "items")]
+      })
+
+    assert html =~ ~s(data-live-ui-shell-section)
+    assert html =~ "Specs"
+    assert html =~ ~s(aria-label="Add spec")
+    assert html =~ "+"
+    assert html =~ ~s(phx-click="add_spec")
+    assert html =~ "items"
+  end
+
+  test "sidebar_section without action renders no action button" do
+    html =
+      render_component(&LiveUi.Widgets.Components.SidebarSection.component/1, %{
+        id: "section-no-action",
+        label: "Repos",
+        inner_block: [slot_text(:inner_block, "")]
+      })
+
+    refute html =~ "data-live-ui-section-action"
+  end
+
+  test "sidebar_item renders selected item with aria-current page" do
+    html =
+      render_component(&LiveUi.Widgets.Components.SidebarItem.component/1, %{
+        id: "item-selected",
+        label: "metagraph",
+        selected: true,
+        inner_block: [slot_text(:inner_block, "")]
+      })
+
+    assert html =~ ~s(data-live-ui-shell-item)
+    assert html =~ ~s(aria-current="page")
+    assert html =~ "metagraph"
+  end
+
+  test "sidebar_item renders unselected item with aria-current false" do
+    html =
+      render_component(&LiveUi.Widgets.Components.SidebarItem.component/1, %{
+        id: "item-unselected",
+        label: "ariston-ui",
+        selected: false,
+        inner_block: [slot_text(:inner_block, "")]
+      })
+
+    assert html =~ ~s(aria-current="false")
+    refute html =~ ~s(aria-current="page")
+  end
+
+  test "sidebar_item renders badge children in slot" do
+    html =
+      render_component(&LiveUi.Widgets.Components.SidebarItem.component/1, %{
+        id: "item-with-badge",
+        label: "inbox",
+        selected: false,
+        inner_block: [slot_text(:inner_block, "<span>3</span>")]
+      })
+
+    assert html =~ "inbox"
+    assert html =~ "3"
+  end
+
+  test "unread_badge renders count with role status" do
+    html =
+      render_component(&LiveUi.Widgets.Components.UnreadBadge.component/1, %{
+        id: "badge",
+        count: 5,
+        threshold: 99
+      })
+
+    assert html =~ ~s(role="status")
+    assert html =~ ~s(data-live-ui-unread-count="5")
+    assert html =~ ~s(aria-label="5 unread")
+    assert html =~ "5"
+  end
+
+  test "unread_badge caps display at threshold" do
+    html =
+      render_component(&LiveUi.Widgets.Components.UnreadBadge.component/1, %{
+        id: "badge-overflow",
+        count: 150,
+        threshold: 99
+      })
+
+    assert html =~ "99+"
+    assert html =~ ~s(data-live-ui-unread-count="150")
+  end
+
+  test "unread_badge renders nothing when count is zero" do
+    html =
+      render_component(&LiveUi.Widgets.Components.UnreadBadge.component/1, %{
+        id: "badge-zero",
+        count: 0
+      })
+
+    refute html =~ ~s(role="status")
+    refute html =~ "0"
+  end
+
+  test "command_palette renders overlay with open state and items" do
+    html =
+      render_component(&LiveUi.Widgets.Components.CommandPalette.component/1, %{
+        id: "palette",
+        open: true,
+        items: [
+          %{id: "goto-spec", label: "Go to spec", active: true},
+          %{id: "new-doc", label: "New document", active: false}
+        ],
+        inner_block: [slot_text(:inner_block, "")]
+      })
+
+    assert html =~ ~s(role="dialog")
+    assert html =~ ~s(aria-modal="true")
+    assert html =~ ~s(aria-hidden="false")
+    assert html =~ ~s(data-live-ui-palette-open="true")
+    assert html =~ ~s(data-live-ui-palette-item="goto-spec")
+    assert html =~ "Go to spec"
+    assert html =~ "New document"
+  end
+
+  test "command_palette with open false has aria-hidden true" do
+    html =
+      render_component(&LiveUi.Widgets.Components.CommandPalette.component/1, %{
+        id: "palette-closed",
+        open: false,
+        items: []
+      })
+
+    assert html =~ ~s(aria-hidden="true")
+    assert html =~ ~s(data-live-ui-palette-open="false")
+  end
+end
diff --git a/packages/unified-ui/lib/unified_ui/widget_components.ex b/packages/unified-ui/lib/unified_ui/widget_components.ex
index b349c710..513bd4c0 100644
--- a/packages/unified-ui/lib/unified_ui/widget_components.ex
+++ b/packages/unified-ui/lib/unified_ui/widget_components.ex
@@ -166,6 +166,52 @@ defmodule UnifiedUi.WidgetComponents do
       summary:
         "Composition behavior that repeats a child template over rows from a list binding.",
       aliases: [:ui_relationship_repeat, :repeat]
+    },
+    %{
+      kind: :top_strip,
+      family: :layer_shell_and_callout,
+      summary:
+        "Top shell strip with brand, context, theme controls, and mode navigation children.",
+      aliases: []
+    },
+    %{
+      kind: :mode_nav,
+      family: :form_control_and_composer,
+      summary:
+        "Navigation control for switching application modes with labeled items and shortcuts.",
+      aliases: []
+    },
+    %{
+      kind: :sidebar_shell,
+      family: :layer_shell_and_callout,
+      summary: "Side navigation shell with collapsible state and sidebar section children.",
+      aliases: []
+    },
+    %{
+      kind: :sidebar_section,
+      family: :layer_shell_and_callout,
+      summary:
+        "Labeled section group inside a sidebar shell with optional action and item children.",
+      aliases: []
+    },
+    %{
+      kind: :sidebar_item,
+      family: :layer_shell_and_callout,
+      summary: "Navigable sidebar item with selected state, intent, and optional badge children.",
+      aliases: []
+    },
+    %{
+      kind: :unread_badge,
+      family: :workflow_progress_and_status,
+      summary: "Compact unread count badge with threshold capping.",
+      aliases: []
+    },
+    %{
+      kind: :command_palette,
+      family: :layer_shell_and_callout,
+      summary:
+        "Keyboard-driven command palette overlay with open state, filterable items, and children.",
+      aliases: []
     }
   ]
 
diff --git a/packages/unified-ui/test/unified_ui/widget_components_catalog_test.exs b/packages/unified-ui/test/unified_ui/widget_components_catalog_test.exs
index 31f96ee1..6243fc52 100644
--- a/packages/unified-ui/test/unified_ui/widget_components_catalog_test.exs
+++ b/packages/unified-ui/test/unified_ui/widget_components_catalog_test.exs
@@ -25,19 +25,26 @@ defmodule UnifiedUi.WidgetComponentsCatalogTest do
              form_control_and_composer: [
                :runtime_form_shell,
                :segmented_button_group,
-               :chat_composer
+               :chat_composer,
+               :mode_nav
              ],
              row_and_artifact: [:list_item_multi_column, :artifact_row],
              workflow_progress_and_status: [
                :pipeline_stepper_horizontal,
                :segmented_progress_bar,
                :workflow_stage_list_vertical,
-               :meter_thin
+               :meter_thin,
+               :unread_badge
              ],
              layer_shell_and_callout: [
                :sticky_frosted_header,
                :slide_over_panel,
-               :event_callout
+               :event_callout,
+               :top_strip,
+               :sidebar_shell,
+               :sidebar_section,
+               :sidebar_item,
+               :command_palette
              ],
              redline_and_code: [:redline_inline, :code_block_syntax_highlighted],
              composition_behavior: [:list_repeat]
diff --git a/packages/unified_iur/lib/unified_iur/fixtures.ex b/packages/unified_iur/lib/unified_iur/fixtures.ex
index a80c32fe..dcd38c4a 100644
--- a/packages/unified_iur/lib/unified_iur/fixtures.ex
+++ b/packages/unified_iur/lib/unified_iur/fixtures.ex
@@ -1055,6 +1055,51 @@ defmodule UnifiedIUR.Fixtures do
            hydrated?: true,
            row_count: 0,
            children: []
+         )},
+        {:content,
+         Components.mode_nav(
+           [
+             %{value: :workspace, label: "Workspace", current?: true},
+             %{value: :settings, label: "Settings"}
+           ],
+           id: "component-mode-nav",
+           aria_label: "Application modes",
+           navigation_intent: :switch_mode
+         )},
+        {:content, Components.unread_badge(5, id: "component-unread-badge", threshold: 99)},
+        {:content,
+         Components.top_strip(
+           [],
+           id: "component-top-strip",
+           brand: "Ariston",
+           context: "Workspace"
+         )},
+        {:content,
+         Components.sidebar_shell(
+           [
+             Components.sidebar_section(
+               "Docs",
+               [
+                 Components.sidebar_item("Overview", [], id: "sidebar-item-overview"),
+                 Components.sidebar_item("Details", [],
+                   id: "sidebar-item-details",
+                   selected?: true
+                 )
+               ],
+               id: "sidebar-section-docs"
+             )
+           ],
+           id: "component-sidebar-shell"
+         )},
+        {:content,
+         Components.command_palette(
+           [
+             %{id: "cmd-1", label: "Open Spec"},
+             %{id: "cmd-2", label: "New Doc"}
+           ],
+           [],
+           id: "component-command-palette",
+           open?: false
          )}
       ],
       id: "component-safety-fixture"
diff --git a/packages/unified_iur/lib/unified_iur/widgets/components.ex b/packages/unified_iur/lib/unified_iur/widgets/components.ex
index bab658d8..983a4910 100644
--- a/packages/unified_iur/lib/unified_iur/widgets/components.ex
+++ b/packages/unified_iur/lib/unified_iur/widgets/components.ex
@@ -35,7 +35,8 @@ defmodule UnifiedIUR.Widgets.Components do
   @form_control_kinds [
     :segmented_button_group,
     :runtime_form_shell,
-    :chat_composer
+    :chat_composer,
+    :mode_nav
   ]
 
   @row_artifact_kinds [
@@ -47,13 +48,19 @@ defmodule UnifiedIUR.Widgets.Components do
     :pipeline_stepper_horizontal,
     :segmented_progress_bar,
     :workflow_stage_list_vertical,
-    :meter_thin
+    :meter_thin,
+    :unread_badge
   ]
 
   @layer_callout_kinds [
     :sticky_frosted_header,
     :slide_over_panel,
-    :event_callout
+    :event_callout,
+    :top_strip,
+    :sidebar_shell,
+    :sidebar_section,
+    :sidebar_item,
+    :command_palette
   ]
 
   @redline_code_kinds [
@@ -503,6 +510,158 @@ defmodule UnifiedIUR.Widgets.Components do
     )
   end
 
+  @spec top_strip(
+          [Element.t() | Element.Child.t() | {atom(), Element.t()} | map()],
+          opts()
+        ) :: Element.t()
+  def top_strip(children \\ [], opts \\ []) when is_list(children) do
+    opts = normalize_opts(opts)
+
+    build_component(
+      :top_strip,
+      :layer_shell_and_callout,
+      %{
+        shell: %{
+          position: :top,
+          brand: option(opts, :brand, ""),
+          context: option(opts, :context, ""),
+          theme: option(opts, :theme, :light),
+          pane_open?: option(opts, :pane_open?, false)
+        }
+      },
+      Map.put(opts, :children, children)
+    )
+  end
+
+  @spec mode_nav([keyword() | map()], opts()) :: Element.t()
+  def mode_nav(items, opts \\ []) when is_list(items) do
+    opts = normalize_opts(opts)
+
+    build_component(
+      :mode_nav,
+      :form_control_and_composer,
+      %{
+        navigation:
+          %{
+            items: normalize_maps(items)
+          }
+          |> maybe_put(:aria_label, option(opts, :aria_label))
+          |> maybe_put(:navigation_intent, option(opts, :navigation_intent))
+          |> maybe_put(:navigation_value_key, option(opts, :navigation_value_key))
+      },
+      opts
+    )
+  end
+
+  @spec sidebar_shell(
+          [Element.t() | Element.Child.t() | {atom(), Element.t()} | map()],
+          opts()
+        ) :: Element.t()
+  def sidebar_shell(children \\ [], opts \\ []) when is_list(children) do
+    opts = normalize_opts(opts)
+
+    build_component(
+      :sidebar_shell,
+      :layer_shell_and_callout,
+      %{
+        shell: %{
+          position: :side,
+          collapsed?: option(opts, :collapsed?, false)
+        }
+      },
+      Map.put(opts, :children, children)
+    )
+  end
+
+  @spec sidebar_section(
+          String.t(),
+          [Element.t() | Element.Child.t() | {atom(), Element.t()} | map()],
+          opts()
+        ) :: Element.t()
+  def sidebar_section(label, children \\ [], opts \\ [])
+      when is_binary(label) and is_list(children) do
+    opts = normalize_opts(opts)
+
+    build_component(
+      :sidebar_section,
+      :layer_shell_and_callout,
+      %{
+        section:
+          %{label: label}
+          |> maybe_put(:action_glyph, option(opts, :action_glyph))
+          |> maybe_put(:action_label, option(opts, :action_label))
+          |> maybe_put(:action_intent, option(opts, :action_intent))
+      },
+      Map.put(opts, :children, children)
+    )
+  end
+
+  @spec sidebar_item(
+          String.t(),
+          [Element.t() | Element.Child.t() | {atom(), Element.t()} | map()],
+          opts()
+        ) :: Element.t()
+  def sidebar_item(label, children \\ [], opts \\ [])
+      when is_binary(label) and is_list(children) do
+    opts = normalize_opts(opts)
+
+    build_component(
+      :sidebar_item,
+      :layer_shell_and_callout,
+      %{
+        item:
+          %{
+            label: label,
+            selected?: option(opts, :selected?, false)
+          }
+          |> maybe_put(:item_intent, option(opts, :item_intent))
+      },
+      Map.put(opts, :children, children)
+    )
+  end
+
+  @spec unread_badge(non_neg_integer(), opts()) :: Element.t()
+  def unread_badge(count, opts \\ []) when is_integer(count) and count >= 0 do
+    opts = normalize_opts(opts)
+
+    build_component(
+      :unread_badge,
+      :workflow_progress_and_status,
+      %{
+        status: %{
+          count: count,
+          threshold: option(opts, :threshold, 99)
+        }
+      },
+      opts
+    )
+  end
+
+  @spec command_palette(
+          [keyword() | map()],
+          [Element.t() | Element.Child.t() | {atom(), Element.t()} | map()],
+          opts()
+        ) :: Element.t()
+  def command_palette(items \\ [], children \\ [], opts \\ [])
+      when is_list(items) and is_list(children) do
+    opts = normalize_opts(opts)
+
+    build_component(
+      :command_palette,
+      :layer_shell_and_callout,
+      %{
+        palette:
+          %{
+            open?: option(opts, :open?, false),
+            items: normalize_maps(items)
+          }
+          |> maybe_put(:filter_intent, option(opts, :filter_intent))
+          |> maybe_put(:select_intent, option(opts, :select_intent))
+      },
+      Map.put(opts, :children, children)
+    )
+  end
+
   defp build_component(kind, family, kind_attributes, opts) do
     opts = normalize_opts(opts)
 
diff --git a/packages/unified_iur/test/unified_iur/widgets/components_test.exs b/packages/unified_iur/test/unified_iur/widgets/components_test.exs
index ea046a1d..fe650c6e 100644
--- a/packages/unified_iur/test/unified_iur/widgets/components_test.exs
+++ b/packages/unified_iur/test/unified_iur/widgets/components_test.exs
@@ -19,7 +19,8 @@ defmodule UnifiedIUR.Widgets.ComponentsTest do
     assert Components.form_control_kinds() == [
              :segmented_button_group,
              :runtime_form_shell,
-             :chat_composer
+             :chat_composer,
+             :mode_nav
            ]
 
     assert Components.row_artifact_kinds() == [:list_item_multi_column, :artifact_row]
@@ -28,13 +29,19 @@ defmodule UnifiedIUR.Widgets.ComponentsTest do
              :pipeline_stepper_horizontal,
              :segmented_progress_bar,
              :workflow_stage_list_vertical,
-             :meter_thin
+             :meter_thin,
+             :unread_badge
            ]
 
     assert Components.layer_callout_kinds() == [
              :sticky_frosted_header,
              :slide_over_panel,
-             :event_callout
+             :event_callout,
+             :top_strip,
+             :sidebar_shell,
+             :sidebar_section,
+             :sidebar_item,
+             :command_palette
            ]
 
     assert Components.redline_code_kinds() == [