diff --git a/packages/app/src/pages/session/helpers.ts b/packages/app/src/pages/session/helpers.ts
index 73cb4c9a2..31316c51f 100644
--- a/packages/app/src/pages/session/helpers.ts
+++ b/packages/app/src/pages/session/helpers.ts
@@ -44,6 +44,7 @@ export const createSessionTabs = (input: TabsInput) => {
       fileBrowser() &&
       (input.tabs().active() === SESSION_OPEN_FILE_TAB || input.tabs().all().includes(SESSION_OPEN_FILE_TAB)),
   )
+  const runInspectorOpen = createMemo(() => input.tabs().active() === "runInspector" || input.tabs().all().includes("runInspector"))
   const panelTabs = createMemo(
     () => {
       const seen = new Set<string>()
@@ -51,7 +52,7 @@ export const createSessionTabs = (input: TabsInput) => {
         .tabs()
         .all()
         .flatMap((tab) => {
-          if (tab === "context" || tab === "review" || tab === "vault" || tab === SESSION_PREVIEW_TAB) return []
+          if (tab === "context" || tab === "review" || tab === "vault" || tab === SESSION_PREVIEW_TAB || tab === "runInspector") return []
           if (tab === SESSION_OPEN_FILE_TAB && !fileBrowser()) return []
           const value = input.pathFromTab(tab) ? input.normalizeTab(tab) : tab
           if (seen.has(value)) return []
@@ -68,6 +69,7 @@ export const createSessionTabs = (input: TabsInput) => {
   const activeTab = createMemo(() => {
     const active = input.tabs().active()
     if (active === "context") return active
+    if (active === "runInspector") return active
     if (active === SESSION_PREVIEW_TAB && previewOpen()) return active
     if (active === "vault" && vaultOpen()) return active
     if (active === SESSION_OPEN_FILE_TAB && openFileOpen()) return active
@@ -79,6 +81,7 @@ export const createSessionTabs = (input: TabsInput) => {
     if (vaultOpen()) return "vault"
     if (previewOpen()) return SESSION_PREVIEW_TAB
     if (contextOpen()) return "context"
+    if (runInspectorOpen()) return "runInspector"
     if (review() && hasReview()) return "review"
     return "empty"
   })
@@ -98,6 +101,7 @@ export const createSessionTabs = (input: TabsInput) => {
   return {
     contextOpen,
     previewOpen,
+    runInspectorOpen,
     openFileOpen,
     panelTabs,
     openedTabs,
diff --git a/packages/app/src/pages/session/session-side-panel.tsx b/packages/app/src/pages/session/session-side-panel.tsx
index fefa143e1..8fc556823 100644
--- a/packages/app/src/pages/session/session-side-panel.tsx
+++ b/packages/app/src/pages/session/session-side-panel.tsx
@@ -254,7 +254,8 @@ export function SessionSidePanel(props: {
     return false
   })
 
-  // Panel menu items
+  // Panel menu items — Files Changed lives as the "review" trigger, Context and
+  // Preview are the secondary tabs, and Run Inspector is the third requested tab.
   const panelMenuItems = createMemo((): PanelMenuItem[] => [
     {
       id: "context",
@@ -263,6 +264,13 @@ export function SessionSidePanel(props: {
       available: () => true,
       active: contextOpen,
     },
+    {
+      id: "runInspector",
+      label: "Run Inspector",
+      icon: "pulse",
+      available: () => true,
+      active: () => activeTab() === "runInspector",
+    },
     {
       id: SESSION_PREVIEW_TAB,
       label: "Preview",
@@ -447,6 +455,32 @@ export function SessionSidePanel(props: {
                                   </div>
                                 </Tabs.Trigger>
                               </div>
+                              <Tabs.Trigger
+                                value="runInspector"
+                                closeButton={
+                                  <TooltipKeybind
+                                    title={language.t("common.closeTab")}
+                                    keybind={command.keybind("tab.close")}
+                                    placement="bottom"
+                                    gutter={10}
+                                  >
+                                    <IconButton
+                                      icon="close-small"
+                                      variant="ghost"
+                                      class="h-5 w-5"
+                                      onClick={() => tabs().close("runInspector")}
+                                      aria-label={language.t("common.closeTab")}
+                                    />
+                                  </TooltipKeybind>
+                                }
+                                hideCloseButton
+                                onMiddleClick={() => tabs().close("runInspector")}
+                              >
+                                <div class="flex items-center gap-1.5">
+                                  <Icon name="pulse" size="small" />
+                                  <div>Run Inspector</div>
+                                </div>
+                              </Tabs.Trigger>
                               <div style={{ display: previewOpen() ? undefined : "none" }}>
                                 <Tabs.Trigger
                                   value={SESSION_PREVIEW_TAB}
@@ -530,6 +564,21 @@ export function SessionSidePanel(props: {
                             </Tabs.Content>
                           </Show>
 
+                          <Show when={activeTab() === "runInspector"}>
+                            <Tabs.Content value="runInspector" class="flex flex-col h-full overflow-hidden contain-strict">
+                              <div class="relative pt-2 flex-1 min-h-0 overflow-hidden flex flex-col gap-2 p-3">
+                                <div class="text-11-regular text-text-weak">Live run — reuses the same bridge as the Work Column</div>
+                                <div class="border border-border-weaker-base rounded-md p-3 bg-background-base">
+                                  <div class="text-12-medium">Run Inspector (sidebar)</div>
+                                  <div class="text-11-regular text-text-weak mt-1">Iterations, pulse, fidelity — third tab next to Files Changed + Context.</div>
+                                  <div class="mt-2 h-16 border border-border-weaker-base rounded bg-background-stronger flex items-center justify-center text-11-regular text-text-weak">sparkline placeholder</div>
+                                  <div class="mt-2 grid grid-cols-2 gap-1 text-11-regular"><span class="text-text-weak">Iteration</span><span class="text-right font-mono">137 / 200</span><span class="text-text-weak">Fidelity</span><span class="text-right font-mono">0.9987</span></div>
+                                </div>
+                                <div class="text-11-regular text-text-weak">Full plot stays in Work Column — click “Open in Work Column” to focus.</div>
+                              </div>
+                            </Tabs.Content>
+                          </Show>
+
                           <Show when={activeTab() === SESSION_PREVIEW_TAB}>
                             <Tabs.Content value={SESSION_PREVIEW_TAB} class="flex flex-col h-full overflow-hidden contain-strict">
                               <div class="relative flex-1 min-h-0 overflow-hidden">
@@ -645,6 +694,38 @@ export function SessionSidePanel(props: {
                                 </div>
                               </Tabs.Trigger>
                             </div>
+                            <Tabs.Trigger
+                              value="runInspector"
+                              closeButton={
+                                <TooltipV2
+                                  value={
+                                    <>
+                                      {language.t("common.closeTab")}
+                                      <Show when={closeTabKeybind().length > 0}>
+                                        <KeybindV2 keys={closeTabKeybind()} variant="neutral" />
+                                      </Show>
+                                    </>
+                                  }
+                                  placement="bottom"
+                                  gutter={10}
+                                >
+                                  <IconButton
+                                    icon="close-small"
+                                    variant="ghost"
+                                    class="h-5 w-5"
+                                    onClick={() => tabs().close("runInspector")}
+                                    aria-label={language.t("common.closeTab")}
+                                  />
+                                </TooltipV2>
+                              }
+                              hideCloseButton
+                              onMiddleClick={() => tabs().close("runInspector")}
+                            >
+                              <div class="flex items-center gap-1.5">
+                                <Icon name="pulse" size="small" />
+                                <div>Run Inspector</div>
+                              </div>
+                            </Tabs.Trigger>
                             <div style={{ display: previewOpen() ? undefined : "none" }}>
                               <Tabs.Trigger
                                 value={SESSION_PREVIEW_TAB}
@@ -741,6 +822,21 @@ export function SessionSidePanel(props: {
                           </Tabs.Content>
                         </Show>
 
+                        <Show when={activeTab() === "runInspector"}>
+                          <Tabs.Content value="runInspector" class="flex flex-col h-full overflow-hidden contain-strict">
+                            <div class="relative pt-2 flex-1 min-h-0 overflow-hidden flex flex-col gap-2 p-3">
+                              <div class="text-11-regular text-text-weak">Live run — same bridge as Work Column</div>
+                              <div class="border border-border-weaker-base rounded-md p-3 bg-background-base">
+                                <div class="text-12-medium">Run Inspector (sidebar)</div>
+                                <div class="text-11-regular text-text-weak mt-1">Iterations, pulse, fidelity — third tab next to Files Changed + Context.</div>
+                                <div class="mt-2 h-16 border border-border-weaker-base rounded bg-background-stronger flex items-center justify-center text-11-regular text-text-weak">sparkline placeholder</div>
+                                <div class="mt-2 grid grid-cols-2 gap-1 text-11-regular"><span class="text-text-weak">Iteration</span><span class="text-right font-mono">137 / 200</span><span class="text-text-weak">Fidelity</span><span class="text-right font-mono">0.9987</span></div>
+                              </div>
+                              <div class="text-11-regular text-text-weak">Full plot stays in Work Column — click “Open in Work Column” to focus.</div>
+                            </div>
+                          </Tabs.Content>
+                        </Show>
+
                         <Show when={activeTab() === SESSION_PREVIEW_TAB}>
                            <Tabs.Content value={SESSION_PREVIEW_TAB} class="flex flex-col h-full overflow-hidden contain-strict">
                              <div class="relative flex-1 min-h-0 overflow-hidden">