diff --git a/ui/litellm-dashboard/src/components/lens/LensWorkspace.integration.test.tsx b/ui/litellm-dashboard/src/components/lens/LensWorkspace.integration.test.tsx
index 49aa02fd6f0..cb0547480d1 100644
--- a/ui/litellm-dashboard/src/components/lens/LensWorkspace.integration.test.tsx
+++ b/ui/litellm-dashboard/src/components/lens/LensWorkspace.integration.test.tsx
@@ -205,4 +205,25 @@ describe("Lens interactive demo", () => {
     expect(await screen.findByRole("table", { name: "Agent runs" })).toBeVisible();
     expect(screen.queryByRole("button", { name: "Preview sample" })).not.toBeInTheDocument();
   });
+
+  it("marks the Investigations tab while a scan runs and clears it once the scan finishes", async () => {
+    const saved = createLensDemoData().lenses[0];
+    const withJob = (status: (typeof saved.jobs)[number]["status"]) => ({
+      ...saved,
+      jobs: [{ ...saved.jobs[0], status }, ...saved.jobs.slice(1)],
+    });
+    const lenses = vi.fn(() => [withJob("running")]);
+    network.mockImplementation(async (input) => {
+      const path = new URL(String(input), "http://localhost").pathname;
+      if (path === "/lens") return Response.json({ lenses: lenses(), workers: [], tracing_enabled: false });
+      if (path === "/v1/traces") return Response.json({ detail: "Tracing is not enabled" }, { status: 501 });
+      return Response.json({ data: [], traces: false, requests: false });
+    });
+    renderWithProviders(<LensWorkspace accessToken="live-token" userRole="Admin" readOnly={false} />);
+    const tab = within(screen.getByRole("tablist", { name: "Lens" })).getByRole("tab", { name: "Investigations" });
+    await waitFor(() => expect(tab).toHaveAccessibleDescription("An investigation is running"));
+    lenses.mockReturnValue([withJob("completed")]);
+    await testQueryClient.refetchQueries({ queryKey: ["lens", "list"] });
+    await waitFor(() => expect(tab).toHaveAccessibleDescription(""));
+  });
 });
diff --git a/ui/litellm-dashboard/src/components/lens/LensWorkspace.tsx b/ui/litellm-dashboard/src/components/lens/LensWorkspace.tsx
index 11fdde333b3..5cccb16a99f 100644
--- a/ui/litellm-dashboard/src/components/lens/LensWorkspace.tsx
+++ b/ui/litellm-dashboard/src/components/lens/LensWorkspace.tsx
@@ -1,8 +1,9 @@
 "use client";
 
 import { useId, useState } from "react";
+import { useQuery } from "@tanstack/react-query";
 import { Tabs as TabsPrimitive } from "@base-ui/react/tabs";
-import { Activity, Aperture, Info, ScanSearch } from "lucide-react";
+import { Activity, Aperture, ArrowUpRight, Info, ScanSearch } from "lucide-react";
 import AgentTracesPage from "@/components/view_logs/TraceView/AgentTracesPage";
 import { Switch } from "@/components/ui/switch";
 import { Tabs, TabsContent } from "@/components/ui/tabs";
@@ -11,6 +12,10 @@ import { LensPreviewContext } from "./LensPreviewButton";
 import { isProxyAdminRole, isProxyAdminTierRole } from "@/utils/roles";
 import { InvestigationsView } from "./investigations/InvestigationsView";
 import { createLensDemo } from "./demo/createLensDemo";
+import { lensQueries } from "./api/queries";
+import { useLensApi } from "./services";
+import { investigationActivity, type InvestigationActivity } from "./model/status";
+import { cn } from "@/lib/cva.config";
 import { LENS_TABS, useLensRoute, type LensTab } from "./route";
 
 type WorkspaceProps = { accessToken: string; userRole: string; readOnly: boolean };
@@ -47,79 +52,148 @@ function DemoToggle({ demo, onChange }: { demo: boolean; onChange: (demo: boolea
 
 const MODE_ICONS = { traces: Activity, investigations: ScanSearch } as const;
 
-function LensModeSwitch() {
+const ACTIVITY_DOT: Record<Exclude<InvestigationActivity, "idle">, { className: string; label: string }> = {
+  running: { className: "bg-[#3b5bfd] motion-safe:animate-pulse", label: "An investigation is running" },
+  queued: { className: "bg-muted-foreground/60", label: "An investigation is queued" },
+};
+
+function ActivityDot({ activity }: { activity: InvestigationActivity }) {
+  if (activity === "idle") return null;
   return (
-    <TabsPrimitive.List
-      aria-label="Lens"
-      className="relative inline-flex h-8 items-center rounded-full border border-border bg-muted/60 p-0.5"
-    >
-      <TabsPrimitive.Indicator className="absolute top-0.5 bottom-0.5 left-(--active-tab-left) w-(--active-tab-width) rounded-full bg-background shadow-sm ring-1 ring-border transition-[left,width] duration-200 ease-out motion-reduce:transition-none" />
-      {Object.entries(LENS_TABS).map(([view, label]) => {
-        const Icon = MODE_ICONS[view as LensTab];
-        return (
-          <TabsPrimitive.Tab
-            key={view}
-            value={view}
-            className="relative z-raised inline-flex h-full items-center gap-1.5 rounded-full px-3 text-xs font-medium text-muted-foreground outline-none transition-colors hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring/50 data-active:text-foreground"
-          >
-            <Icon aria-hidden="true" className="size-3.5" />
-            {label}
-          </TabsPrimitive.Tab>
-        );
-      })}
-    </TabsPrimitive.List>
+    <span
+      aria-hidden="true"
+      className={cn(
+        "size-1.5 rounded-full animate-in fade-in-0 zoom-in-50 duration-300",
+        ACTIVITY_DOT[activity].className,
+      )}
+    />
   );
 }
 
+function NotchCorner({ side }: { side: "left" | "right" }) {
+  return (
+    <svg
+      aria-hidden="true"
+      width="13"
+      height="12"
+      viewBox="0 0 13 12"
+      className={cn(
+        "pointer-events-none absolute bottom-0 overflow-visible",
+        side === "left" ? "-left-3" : "-right-3 -scale-x-100",
+      )}
+    >
+      <path d="M0 11 A12.5 11 0 0 0 12.5 0 H13 V12 H0 Z" className="fill-card" />
+      <path d="M0 11.5 A12.5 11.5 0 0 0 12.5 0" className="fill-none stroke-border" />
+    </svg>
+  );
+}
+
+function LensModeSwitch({ activity }: { activity: InvestigationActivity }) {
+  return (
+    <div className="relative z-raised -mb-px rounded-t-2xl border-x border-t border-border bg-card px-1.5 pt-1.5 pb-[7px]">
+      <NotchCorner side="left" />
+      <NotchCorner side="right" />
+      <TabsPrimitive.List
+        aria-label="Lens"
+        className="relative inline-flex h-9 items-center rounded-full bg-muted/70 p-1"
+      >
+        <TabsPrimitive.Indicator className="absolute top-1 bottom-1 left-(--active-tab-left) w-(--active-tab-width) rounded-full bg-background shadow-sm ring-1 ring-border transition-[left,width] duration-300 ease-[cubic-bezier(0.32,0.72,0,1)] motion-reduce:transition-none" />
+        {Object.entries(LENS_TABS).map(([view, label]) => {
+          const Icon = MODE_ICONS[view as LensTab];
+          return (
+            <TabsPrimitive.Tab
+              key={view}
+              value={view}
+              aria-description={
+                view === "investigations" && activity !== "idle" ? ACTIVITY_DOT[activity].label : undefined
+              }
+              className="relative z-raised inline-flex h-full items-center gap-2 rounded-full px-4 text-sm font-medium text-muted-foreground outline-none transition-colors duration-200 hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring/50 data-active:text-foreground"
+            >
+              <Icon aria-hidden="true" className="size-4" />
+              {label}
+              {view === "investigations" && <ActivityDot activity={activity} />}
+            </TabsPrimitive.Tab>
+          );
+        })}
+      </TabsPrimitive.List>
+    </div>
+  );
+}
+
+function useInvestigationActivity(accessToken: string, enabled: boolean): InvestigationActivity {
+  const api = useLensApi(accessToken);
+  const { data } = useQuery({ ...lensQueries.list(api, false), enabled });
+  return investigationActivity(data?.lenses ?? []);
+}
+
+const PANEL =
+  "flex min-h-0 flex-1 flex-col overflow-y-auto animate-in fade-in-0 duration-300 motion-reduce:animate-none";
+
 function LensContent({ accessToken, userRole, readOnly }: WorkspaceProps) {
   const { tab, lensId, demo, setTab, setDemo } = useLensRoute();
   const [previewTarget, setPreviewTarget] = useState<HTMLDivElement | null>(null);
   const activeTab = tab ?? (lensId ? "investigations" : "traces");
+  const canInvestigate = isProxyAdminTierRole(userRole);
+  const activity = useInvestigationActivity(accessToken, canInvestigate);
   const preview = (view: LensTab) => ({
     target: previewTarget,
     open: !demo && activeTab === view ? () => setDemo(true) : undefined,
   });
   return (
-    <main className="flex h-full w-full min-w-0 flex-1 flex-col gap-2 px-3 pt-2 pb-3">
-      <Tabs value={activeTab} onValueChange={(value) => setTab(value as LensTab)} className="min-h-0 flex-1 gap-2">
-        <div className="flex min-h-8 flex-wrap items-center justify-between gap-3">
-          <div className="flex items-center gap-3">
-            <h1 className="flex items-center gap-1.5 text-sm font-semibold tracking-tight">
-              <Aperture aria-hidden="true" className="size-4" strokeWidth={2} />
+    <main className="flex h-full w-full min-w-0 flex-1 flex-col px-3 pt-2 pb-3">
+      <Tabs value={activeTab} onValueChange={(value) => setTab(value as LensTab)} className="min-h-0 flex-1 gap-0">
+        <div className="grid grid-cols-[1fr_auto_1fr] items-end gap-3">
+          <div className="flex min-w-0 flex-col gap-0.5 self-center">
+            <h1 className="flex items-center gap-2 text-lg font-semibold tracking-tight">
+              <Aperture aria-hidden="true" className="size-5" strokeWidth={2} />
               Lens
             </h1>
-            <LensModeSwitch />
+            <p className="truncate text-xs text-muted-foreground">
+              Trace your agents and investigate what goes wrong.{" "}
+              <a
+                href="https://docs.litellm.ai/docs/proxy/lens"
+                target="_blank"
+                rel="noopener noreferrer"
+                className="inline-flex items-center gap-0.5 font-medium text-foreground/80 underline-offset-2 hover:text-foreground hover:underline"
+              >
+                Docs
+                <ArrowUpRight aria-hidden="true" className="size-3" />
+              </a>
+            </p>
           </div>
-          <div className="flex items-center gap-3">
+          <LensModeSwitch activity={activity} />
+          <div className="flex min-w-0 flex-wrap items-center justify-end gap-3 self-center">
             <div ref={setPreviewTarget} />
             <DemoToggle demo={demo} onChange={setDemo} />
           </div>
         </div>
-        <TabsContent value="traces" keepMounted className="flex min-h-0 flex-col overflow-y-auto">
-          <LensPreviewContext.Provider value={preview("traces")}>
-            <AgentTracesPage
-              accessToken={accessToken}
-              isActive={activeTab === "traces"}
-              readOnly={readOnly}
-              canMintTracingKey={isProxyAdminRole(userRole)}
-            />
-          </LensPreviewContext.Provider>
-        </TabsContent>
-        <TabsContent value="investigations" className="flex min-h-0 flex-col overflow-y-auto">
-          <LensPreviewContext.Provider value={preview("investigations")}>
-            {isProxyAdminTierRole(userRole) ? (
-              <InvestigationsView
-                active={activeTab === "investigations"}
+        <div className="flex min-h-0 flex-1 flex-col rounded-2xl border border-border bg-card p-3">
+          <TabsContent value="traces" keepMounted className={PANEL}>
+            <LensPreviewContext.Provider value={preview("traces")}>
+              <AgentTracesPage
                 accessToken={accessToken}
-                readOnly={readOnly || !isProxyAdminRole(userRole)}
+                isActive={activeTab === "traces"}
+                readOnly={readOnly}
+                canMintTracingKey={isProxyAdminRole(userRole)}
               />
-            ) : (
-              <p className="py-6 text-sm text-muted-foreground">
-                Investigations require proxy administrator access. You can still view your traces.
-              </p>
-            )}
-          </LensPreviewContext.Provider>
-        </TabsContent>
+            </LensPreviewContext.Provider>
+          </TabsContent>
+          <TabsContent value="investigations" className={PANEL}>
+            <LensPreviewContext.Provider value={preview("investigations")}>
+              {canInvestigate ? (
+                <InvestigationsView
+                  active={activeTab === "investigations"}
+                  accessToken={accessToken}
+                  readOnly={readOnly || !isProxyAdminRole(userRole)}
+                />
+              ) : (
+                <p className="py-6 text-sm text-muted-foreground">
+                  Investigations require proxy administrator access. You can still view your traces.
+                </p>
+              )}
+            </LensPreviewContext.Provider>
+          </TabsContent>
+        </div>
       </Tabs>
     </main>
   );
diff --git a/ui/litellm-dashboard/src/components/lens/model/status.test.ts b/ui/litellm-dashboard/src/components/lens/model/status.test.ts
index b77490e981e..c6b9eabf70e 100644
--- a/ui/litellm-dashboard/src/components/lens/model/status.test.ts
+++ b/ui/litellm-dashboard/src/components/lens/model/status.test.ts
@@ -1,4 +1,4 @@
-import { nextCheckStatus, workerConnected } from "./status";
+import { investigationActivity, nextCheckStatus, workerConnected } from "./status";
 import { describe, expect, it } from "vitest";
 
 import type { Job, Lens, LensList } from "./types";
@@ -102,3 +102,12 @@ it("shows the actual next schedule and avoids a stale countdown during active sc
   );
   expect(nextCheckStatus(lens, now)).toBeNull();
 });
+
+it("summarizes activity across investigations, preferring a running scan over a queued one", () => {
+  const withStatus = (status: Job["status"]): Lens => ({ ...lens, jobs: [{ ...job, status }] });
+  expect(investigationActivity([])).toBe("idle");
+  expect(investigationActivity([lens, withStatus("failed")])).toBe("idle");
+  expect(investigationActivity([lens, withStatus("queued")])).toBe("queued");
+  expect(investigationActivity([withStatus("queued"), withStatus("running")])).toBe("running");
+  expect(investigationActivity([{ ...lens, jobs: [lens.jobs[0], { ...job, status: "running" }] }])).toBe("running");
+});
diff --git a/ui/litellm-dashboard/src/components/lens/model/status.ts b/ui/litellm-dashboard/src/components/lens/model/status.ts
index daed4c9060b..75a345c6ea5 100644
--- a/ui/litellm-dashboard/src/components/lens/model/status.ts
+++ b/ui/litellm-dashboard/src/components/lens/model/status.ts
@@ -43,3 +43,12 @@ export function readiness(
   const ready = activityReady && connected && !listError;
   return { tracesReady, requestsReady, activityReady, ready };
 }
+
+export type InvestigationActivity = "running" | "queued" | "idle";
+
+export function investigationActivity(lenses: readonly Lens[]): InvestigationActivity {
+  const statuses = new Set(lenses.flatMap((lens) => lens.jobs.map((job) => job.status)));
+  if (statuses.has("running")) return "running";
+  if (statuses.has("queued")) return "queued";
+  return "idle";
+}