diff --git a/ui/src/App.tsx b/ui/src/App.tsx
index 9fe1f9d9dfb..55198b0e726 100644
--- a/ui/src/App.tsx
+++ b/ui/src/App.tsx
@@ -10,6 +10,7 @@ import { AgentDetail } from "./pages/AgentDetail";
 import { Projects } from "./pages/Projects";
 import { ProjectDetail } from "./pages/ProjectDetail";
 import { ProjectWorkspaceDetail } from "./pages/ProjectWorkspaceDetail";
+import { Workspaces } from "./pages/Workspaces";
 import { Issues } from "./pages/Issues";
 import { IssueDetail } from "./pages/IssueDetail";
 import { Routines } from "./pages/Routines";
@@ -89,6 +90,7 @@ function boardRoutes() {
       <Route path="projects/:projectId/workspaces" element={<ProjectDetail />} />
       <Route path="projects/:projectId/configuration" element={<ProjectDetail />} />
       <Route path="projects/:projectId/budget" element={<ProjectDetail />} />
+      <Route path="workspaces" element={<Workspaces />} />
       <Route path="issues" element={<Issues />} />
       <Route path="issues/all" element={<Navigate to="/issues" replace />} />
       <Route path="issues/active" element={<Navigate to="/issues" replace />} />
@@ -293,6 +295,7 @@ export function App() {
           <Route path="projects/:projectId/workspaces" element={<UnprefixedBoardRedirect />} />
           <Route path="projects/:projectId/workspaces/:workspaceId" element={<UnprefixedBoardRedirect />} />
           <Route path="projects/:projectId/configuration" element={<UnprefixedBoardRedirect />} />
+          <Route path="workspaces" element={<UnprefixedBoardRedirect />} />
           <Route path="execution-workspaces/:workspaceId" element={<UnprefixedBoardRedirect />} />
           <Route path="execution-workspaces/:workspaceId/configuration" element={<UnprefixedBoardRedirect />} />
           <Route path="execution-workspaces/:workspaceId/runtime-logs" element={<UnprefixedBoardRedirect />} />
diff --git a/ui/src/components/ProjectWorkspacesContent.tsx b/ui/src/components/ProjectWorkspacesContent.tsx
new file mode 100644
index 00000000000..4f18ded2d9d
--- /dev/null
+++ b/ui/src/components/ProjectWorkspacesContent.tsx
@@ -0,0 +1,119 @@
+import { useState } from "react";
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import type { ExecutionWorkspace } from "@paperclipai/shared";
+import { executionWorkspacesApi } from "../api/execution-workspaces";
+import { projectsApi } from "../api/projects";
+import { queryKeys } from "../lib/queryKeys";
+import type { ProjectWorkspaceSummary } from "../lib/project-workspaces-tab";
+import { ExecutionWorkspaceCloseDialog } from "./ExecutionWorkspaceCloseDialog";
+import { ProjectWorkspaceSummaryCard } from "./ProjectWorkspaceSummaryCard";
+
+export function ProjectWorkspacesContent({
+  companyId,
+  projectId,
+  projectRef,
+  summaries,
+}: {
+  companyId: string;
+  projectId: string;
+  projectRef: string;
+  summaries: ProjectWorkspaceSummary[];
+}) {
+  const queryClient = useQueryClient();
+  const [runtimeActionKey, setRuntimeActionKey] = useState<string | null>(null);
+  const [closingWorkspace, setClosingWorkspace] = useState<{
+    id: string;
+    name: string;
+    status: ExecutionWorkspace["status"];
+  } | null>(null);
+  const controlWorkspaceRuntime = useMutation({
+    mutationFn: async (input: {
+      key: string;
+      kind: "project_workspace" | "execution_workspace";
+      workspaceId: string;
+      action: "start" | "stop" | "restart";
+    }) => {
+      setRuntimeActionKey(`${input.key}:${input.action}`);
+      if (input.kind === "project_workspace") {
+        return await projectsApi.controlWorkspaceRuntimeServices(projectId, input.workspaceId, input.action, companyId);
+      }
+      return await executionWorkspacesApi.controlRuntimeServices(input.workspaceId, input.action);
+    },
+    onSettled: () => {
+      setRuntimeActionKey(null);
+      queryClient.invalidateQueries({ queryKey: queryKeys.executionWorkspaces.list(companyId) });
+      queryClient.invalidateQueries({ queryKey: queryKeys.executionWorkspaces.list(companyId, { projectId }) });
+      queryClient.invalidateQueries({ queryKey: queryKeys.projects.detail(projectId) });
+      queryClient.invalidateQueries({ queryKey: queryKeys.projects.list(companyId) });
+      queryClient.invalidateQueries({ queryKey: queryKeys.issues.list(companyId) });
+      queryClient.invalidateQueries({ queryKey: queryKeys.issues.listByProject(companyId, projectId) });
+    },
+  });
+
+  if (summaries.length === 0) {
+    return <p className="text-sm text-muted-foreground">No non-default workspace activity yet.</p>;
+  }
+
+  const activeSummaries = summaries.filter((summary) => summary.executionWorkspaceStatus !== "cleanup_failed");
+  const cleanupFailedSummaries = summaries.filter((summary) => summary.executionWorkspaceStatus === "cleanup_failed");
+
+  return (
+    <>
+      <div className="space-y-4">
+        <div className="space-y-3">
+          {activeSummaries.map((summary) => (
+            <ProjectWorkspaceSummaryCard
+              key={summary.key}
+              projectRef={projectRef}
+              summary={summary}
+              runtimeActionKey={runtimeActionKey}
+              runtimeActionPending={controlWorkspaceRuntime.isPending}
+              onRuntimeAction={(input) => controlWorkspaceRuntime.mutate(input)}
+              onCloseWorkspace={(input) => setClosingWorkspace(input)}
+            />
+          ))}
+        </div>
+        {cleanupFailedSummaries.length > 0 ? (
+          <div className="space-y-2">
+            <div className="text-xs font-medium uppercase tracking-[0.18em] text-muted-foreground">
+              Cleanup attention needed
+            </div>
+            <div className="space-y-3">
+              {cleanupFailedSummaries.map((summary) => (
+                <ProjectWorkspaceSummaryCard
+                  key={summary.key}
+                  projectRef={projectRef}
+                  summary={summary}
+                  runtimeActionKey={runtimeActionKey}
+                  runtimeActionPending={controlWorkspaceRuntime.isPending}
+                  onRuntimeAction={(input) => controlWorkspaceRuntime.mutate(input)}
+                  onCloseWorkspace={(input) => setClosingWorkspace(input)}
+                />
+              ))}
+            </div>
+          </div>
+        ) : null}
+      </div>
+      {closingWorkspace ? (
+        <ExecutionWorkspaceCloseDialog
+          workspaceId={closingWorkspace.id}
+          workspaceName={closingWorkspace.name}
+          currentStatus={closingWorkspace.status}
+          open
+          onOpenChange={(open) => {
+            if (!open) setClosingWorkspace(null);
+          }}
+          onClosed={() => {
+            queryClient.invalidateQueries({ queryKey: queryKeys.executionWorkspaces.list(companyId) });
+            queryClient.invalidateQueries({ queryKey: queryKeys.executionWorkspaces.list(companyId, { projectId }) });
+            queryClient.invalidateQueries({ queryKey: queryKeys.projects.detail(projectId) });
+            queryClient.invalidateQueries({ queryKey: queryKeys.projects.list(companyId) });
+            queryClient.invalidateQueries({ queryKey: queryKeys.issues.list(companyId) });
+            queryClient.invalidateQueries({ queryKey: queryKeys.issues.listByProject(companyId, projectId) });
+            setClosingWorkspace(null);
+          }}
+        />
+      ) : null}
+    </>
+  );
+}
diff --git a/ui/src/components/Sidebar.test.tsx b/ui/src/components/Sidebar.test.tsx
new file mode 100644
index 00000000000..6d52ddc3f2f
--- /dev/null
+++ b/ui/src/components/Sidebar.test.tsx
@@ -0,0 +1,153 @@
+// @vitest-environment jsdom
+
+import { act } from "react";
+import type { ReactNode } from "react";
+import { createRoot } from "react-dom/client";
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { Sidebar } from "./Sidebar";
+
+const mockHeartbeatsApi = vi.hoisted(() => ({
+  liveRunsForCompany: vi.fn(),
+}));
+
+const mockInstanceSettingsApi = vi.hoisted(() => ({
+  getExperimental: vi.fn(),
+}));
+
+vi.mock("@/lib/router", () => ({
+  NavLink: ({ to, children, className, ...props }: {
+    to: string;
+    children: ReactNode;
+    className?: string | ((state: { isActive: boolean }) => string);
+  }) => (
+    <a
+      href={to}
+      className={typeof className === "function" ? className({ isActive: false }) : className}
+      {...props}
+    >
+      {children}
+    </a>
+  ),
+}));
+
+vi.mock("../context/DialogContext", () => ({
+  useDialog: () => ({
+    openNewIssue: vi.fn(),
+  }),
+}));
+
+vi.mock("../context/CompanyContext", () => ({
+  useCompany: () => ({
+    selectedCompanyId: "company-1",
+    selectedCompany: { id: "company-1", issuePrefix: "PAP", name: "Paperclip" },
+  }),
+}));
+
+vi.mock("../context/SidebarContext", () => ({
+  useSidebar: () => ({
+    isMobile: false,
+    setSidebarOpen: vi.fn(),
+  }),
+}));
+
+vi.mock("../api/heartbeats", () => ({
+  heartbeatsApi: mockHeartbeatsApi,
+}));
+
+vi.mock("../api/instanceSettings", () => ({
+  instanceSettingsApi: mockInstanceSettingsApi,
+}));
+
+vi.mock("../hooks/useInboxBadge", () => ({
+  useInboxBadge: () => ({ inbox: 0, failedRuns: 0 }),
+}));
+
+vi.mock("@/plugins/slots", () => ({
+  PluginSlotOutlet: () => null,
+}));
+
+vi.mock("./SidebarCompanyMenu", () => ({
+  SidebarCompanyMenu: () => <div>Company menu</div>,
+}));
+
+vi.mock("./SidebarProjects", () => ({
+  SidebarProjects: () => null,
+}));
+
+vi.mock("./SidebarAgents", () => ({
+  SidebarAgents: () => null,
+}));
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+(globalThis as any).IS_REACT_ACT_ENVIRONMENT = true;
+
+async function flushReact() {
+  await act(async () => {
+    await Promise.resolve();
+    await new Promise((resolve) => window.setTimeout(resolve, 0));
+  });
+}
+
+describe("Sidebar", () => {
+  let container: HTMLDivElement;
+
+  beforeEach(() => {
+    container = document.createElement("div");
+    document.body.appendChild(container);
+    mockHeartbeatsApi.liveRunsForCompany.mockResolvedValue([]);
+  });
+
+  afterEach(() => {
+    container.remove();
+    document.body.innerHTML = "";
+    vi.clearAllMocks();
+  });
+
+  it("does not flash the Workspaces link while experimental settings are loading", async () => {
+    mockInstanceSettingsApi.getExperimental.mockImplementation(() => new Promise(() => {}));
+    const root = createRoot(container);
+    const queryClient = new QueryClient({
+      defaultOptions: { queries: { retry: false } },
+    });
+
+    await act(async () => {
+      root.render(
+        <QueryClientProvider client={queryClient}>
+          <Sidebar />
+        </QueryClientProvider>,
+      );
+    });
+    await flushReact();
+
+    expect(container.textContent).not.toContain("Workspaces");
+
+    await act(async () => {
+      root.unmount();
+    });
+  });
+
+  it("shows the Workspaces link when isolated workspaces are enabled", async () => {
+    mockInstanceSettingsApi.getExperimental.mockResolvedValue({ enableIsolatedWorkspaces: true });
+    const root = createRoot(container);
+    const queryClient = new QueryClient({
+      defaultOptions: { queries: { retry: false } },
+    });
+
+    await act(async () => {
+      root.render(
+        <QueryClientProvider client={queryClient}>
+          <Sidebar />
+        </QueryClientProvider>,
+      );
+    });
+    await flushReact();
+
+    const link = [...container.querySelectorAll("a")].find((anchor) => anchor.textContent === "Workspaces");
+    expect(link?.getAttribute("href")).toBe("/workspaces");
+
+    await act(async () => {
+      root.unmount();
+    });
+  });
+});
diff --git a/ui/src/components/Sidebar.tsx b/ui/src/components/Sidebar.tsx
index 1b494576494..28e8957d3f4 100644
--- a/ui/src/components/Sidebar.tsx
+++ b/ui/src/components/Sidebar.tsx
@@ -10,6 +10,7 @@ import {
   Network,
   Boxes,
   Repeat,
+  GitBranch,
   Settings,
 } from "lucide-react";
 import { useQuery } from "@tanstack/react-query";
@@ -20,6 +21,7 @@ import { SidebarAgents } from "./SidebarAgents";
 import { useDialog } from "../context/DialogContext";
 import { useCompany } from "../context/CompanyContext";
 import { heartbeatsApi } from "../api/heartbeats";
+import { instanceSettingsApi } from "../api/instanceSettings";
 import { queryKeys } from "../lib/queryKeys";
 import { useInboxBadge } from "../hooks/useInboxBadge";
 import { Button } from "@/components/ui/button";
@@ -30,6 +32,10 @@ export function Sidebar() {
   const { openNewIssue } = useDialog();
   const { selectedCompanyId, selectedCompany } = useCompany();
   const inboxBadge = useInboxBadge(selectedCompanyId);
+  const { data: experimentalSettings } = useQuery({
+    queryKey: queryKeys.instance.experimentalSettings,
+    queryFn: () => instanceSettingsApi.getExperimental(),
+  });
   const { data: liveRuns } = useQuery({
     queryKey: queryKeys.liveRuns(selectedCompanyId!),
     queryFn: () => heartbeatsApi.liveRunsForCompany(selectedCompanyId!),
@@ -37,6 +43,7 @@ export function Sidebar() {
     refetchInterval: 10_000,
   });
   const liveRunCount = liveRuns?.length ?? 0;
+  const showWorkspacesLink = experimentalSettings?.enableIsolatedWorkspaces === true;
 
   function openSearch() {
     document.dispatchEvent(new KeyboardEvent("keydown", { key: "k", metaKey: true }));
@@ -94,6 +101,9 @@ export function Sidebar() {
           <SidebarNavItem to="/issues" label="Issues" icon={CircleDot} />
           <SidebarNavItem to="/routines" label="Routines" icon={Repeat} />
           <SidebarNavItem to="/goals" label="Goals" icon={Target} />
+          {showWorkspacesLink ? (
+            <SidebarNavItem to="/workspaces" label="Workspaces" icon={GitBranch} />
+          ) : null}
         </SidebarSection>
 
         <SidebarProjects />
diff --git a/ui/src/lib/company-routes.ts b/ui/src/lib/company-routes.ts
index 48d71ef2f34..a14eff0f8ee 100644
--- a/ui/src/lib/company-routes.ts
+++ b/ui/src/lib/company-routes.ts
@@ -6,6 +6,7 @@ const BOARD_ROUTE_ROOTS = new Set([
   "org",
   "agents",
   "projects",
+  "workspaces",
   "execution-workspaces",
   "issues",
   "routines",
diff --git a/ui/src/pages/ProjectDetail.tsx b/ui/src/pages/ProjectDetail.tsx
index eaa65f0972c..5fc126310a5 100644
--- a/ui/src/pages/ProjectDetail.tsx
+++ b/ui/src/pages/ProjectDetail.tsx
@@ -1,7 +1,7 @@
 import { useCallback, useEffect, useMemo, useState, useRef } from "react";
 import { Link, useParams, useNavigate, useLocation, Navigate } from "@/lib/router";
 import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
-import { PROJECT_COLORS, isUuidLike, type BudgetPolicySummary, type ExecutionWorkspace } from "@paperclipai/shared";
+import { PROJECT_COLORS, isUuidLike, type BudgetPolicySummary } from "@paperclipai/shared";
 import { budgetsApi } from "../api/budgets";
 import { executionWorkspacesApi } from "../api/execution-workspaces";
 import { instanceSettingsApi } from "../api/instanceSettings";
@@ -19,18 +19,16 @@ import { ProjectProperties, type ProjectConfigFieldKey, type ProjectFieldSaveSta
 import { InlineEditor } from "../components/InlineEditor";
 import { StatusBadge } from "../components/StatusBadge";
 import { BudgetPolicyCard } from "../components/BudgetPolicyCard";
-import { ExecutionWorkspaceCloseDialog } from "../components/ExecutionWorkspaceCloseDialog";
 import { IssuesList } from "../components/IssuesList";
 import { PageSkeleton } from "../components/PageSkeleton";
 import { PageTabBar } from "../components/PageTabBar";
-import { ProjectWorkspaceSummaryCard } from "../components/ProjectWorkspaceSummaryCard";
+import { ProjectWorkspacesContent } from "../components/ProjectWorkspacesContent";
 import { buildProjectWorkspaceSummaries } from "../lib/project-workspaces-tab";
 import { projectRouteRef } from "../lib/utils";
 import { Button } from "@/components/ui/button";
 import { Tabs } from "@/components/ui/tabs";
 import { PluginLauncherOutlet } from "@/plugins/launchers";
 import { PluginSlotMount, PluginSlotOutlet, usePluginSlots } from "@/plugins/slots";
-import { Loader2 } from "lucide-react";
 
 /* ── Top-level tab types ── */
 
@@ -215,110 +213,6 @@ function ProjectIssuesList({ projectId, companyId }: { projectId: string; compan
   );
 }
 
-function ProjectWorkspacesContent({
-  companyId,
-  projectId,
-  projectRef,
-  summaries,
-}: {
-  companyId: string;
-  projectId: string;
-  projectRef: string;
-  summaries: ReturnType<typeof buildProjectWorkspaceSummaries>;
-}) {
-  const queryClient = useQueryClient();
-  const [runtimeActionKey, setRuntimeActionKey] = useState<string | null>(null);
-  const [closingWorkspace, setClosingWorkspace] = useState<{
-    id: string;
-    name: string;
-    status: ExecutionWorkspace["status"];
-  } | null>(null);
-  const controlWorkspaceRuntime = useMutation({
-    mutationFn: async (input: {
-      key: string;
-      kind: "project_workspace" | "execution_workspace";
-      workspaceId: string;
-      action: "start" | "stop" | "restart";
-    }) => {
-      setRuntimeActionKey(`${input.key}:${input.action}`);
-      if (input.kind === "project_workspace") {
-        return await projectsApi.controlWorkspaceRuntimeServices(projectId, input.workspaceId, input.action, companyId);
-      }
-      return await executionWorkspacesApi.controlRuntimeServices(input.workspaceId, input.action);
-    },
-    onSettled: () => {
-      setRuntimeActionKey(null);
-      queryClient.invalidateQueries({ queryKey: queryKeys.executionWorkspaces.list(companyId, { projectId }) });
-      queryClient.invalidateQueries({ queryKey: queryKeys.projects.detail(projectId) });
-      queryClient.invalidateQueries({ queryKey: queryKeys.issues.listByProject(companyId, projectId) });
-    },
-  });
-
-  if (summaries.length === 0) {
-    return <p className="text-sm text-muted-foreground">No non-default workspace activity yet.</p>;
-  }
-
-  const activeSummaries = summaries.filter((summary) => summary.executionWorkspaceStatus !== "cleanup_failed");
-  const cleanupFailedSummaries = summaries.filter((summary) => summary.executionWorkspaceStatus === "cleanup_failed");
-
-  return (
-    <>
-      <div className="space-y-4">
-        <div className="space-y-3">
-          {activeSummaries.map((summary) => (
-            <ProjectWorkspaceSummaryCard
-              key={summary.key}
-              projectRef={projectRef}
-              summary={summary}
-              runtimeActionKey={runtimeActionKey}
-              runtimeActionPending={controlWorkspaceRuntime.isPending}
-              onRuntimeAction={(input) => controlWorkspaceRuntime.mutate(input)}
-              onCloseWorkspace={(input) => setClosingWorkspace(input)}
-            />
-          ))}
-        </div>
-        {cleanupFailedSummaries.length > 0 ? (
-          <div className="space-y-2">
-            <div className="text-xs font-medium uppercase tracking-[0.18em] text-muted-foreground">
-              Cleanup attention needed
-            </div>
-            <div className="space-y-3">
-              {cleanupFailedSummaries.map((summary) => (
-                <ProjectWorkspaceSummaryCard
-                  key={summary.key}
-                  projectRef={projectRef}
-                  summary={summary}
-                  runtimeActionKey={runtimeActionKey}
-                  runtimeActionPending={controlWorkspaceRuntime.isPending}
-                  onRuntimeAction={(input) => controlWorkspaceRuntime.mutate(input)}
-                  onCloseWorkspace={(input) => setClosingWorkspace(input)}
-                />
-              ))}
-            </div>
-          </div>
-        ) : null}
-      </div>
-      {closingWorkspace ? (
-        <ExecutionWorkspaceCloseDialog
-          workspaceId={closingWorkspace.id}
-          workspaceName={closingWorkspace.name}
-          currentStatus={closingWorkspace.status}
-          open
-          onOpenChange={(open) => {
-            if (!open) setClosingWorkspace(null);
-          }}
-          onClosed={() => {
-            queryClient.invalidateQueries({ queryKey: queryKeys.executionWorkspaces.list(companyId, { projectId }) });
-            queryClient.invalidateQueries({ queryKey: queryKeys.projects.detail(projectId) });
-            queryClient.invalidateQueries({ queryKey: queryKeys.issues.listByProject(companyId, projectId) });
-            setClosingWorkspace(null);
-          }}
-        />
-      ) : null}
-    </>
-  );
-}
-
 /* ── Main project page ── */
 
 export function ProjectDetail() {
diff --git a/ui/src/pages/Workspaces.tsx b/ui/src/pages/Workspaces.tsx
new file mode 100644
index 00000000000..11432525406
--- /dev/null
+++ b/ui/src/pages/Workspaces.tsx
@@ -0,0 +1,163 @@
+import { useEffect, useMemo } from "react";
+import { Link, Navigate } from "@/lib/router";
+import { useQuery } from "@tanstack/react-query";
+import type { ExecutionWorkspace, Issue, Project } from "@paperclipai/shared";
+import { executionWorkspacesApi } from "../api/execution-workspaces";
+import { instanceSettingsApi } from "../api/instanceSettings";
+import { issuesApi } from "../api/issues";
+import { projectsApi } from "../api/projects";
+import { ProjectWorkspacesContent } from "../components/ProjectWorkspacesContent";
+import { PageSkeleton } from "../components/PageSkeleton";
+import { useBreadcrumbs } from "../context/BreadcrumbContext";
+import { useCompany } from "../context/CompanyContext";
+import { buildProjectWorkspaceSummaries, type ProjectWorkspaceSummary } from "../lib/project-workspaces-tab";
+import { queryKeys } from "../lib/queryKeys";
+import { projectRouteRef } from "../lib/utils";
+
+type ProjectWorkspaceGroup = {
+  project: Project;
+  projectRef: string;
+  summaries: ProjectWorkspaceSummary[];
+  lastUpdatedAt: Date;
+  runningServiceCount: number;
+};
+
+function buildProjectWorkspaceGroups(input: {
+  projects: Project[];
+  issues: Issue[];
+  executionWorkspaces: ExecutionWorkspace[];
+}): ProjectWorkspaceGroup[] {
+  const issuesByProjectId = new Map<string, Issue[]>();
+  for (const issue of input.issues) {
+    if (!issue.projectId) continue;
+    const existing = issuesByProjectId.get(issue.projectId) ?? [];
+    existing.push(issue);
+    issuesByProjectId.set(issue.projectId, existing);
+  }
+
+  const executionWorkspacesByProjectId = new Map<string, ExecutionWorkspace[]>();
+  for (const workspace of input.executionWorkspaces) {
+    if (!workspace.projectId) continue;
+    const existing = executionWorkspacesByProjectId.get(workspace.projectId) ?? [];
+    existing.push(workspace);
+    executionWorkspacesByProjectId.set(workspace.projectId, existing);
+  }
+
+  return input.projects
+    .map((project) => {
+      const summaries = buildProjectWorkspaceSummaries({
+        project,
+        issues: issuesByProjectId.get(project.id) ?? [],
+        executionWorkspaces: executionWorkspacesByProjectId.get(project.id) ?? [],
+      });
+      if (summaries.length === 0) return null;
+      return {
+        project,
+        projectRef: projectRouteRef(project),
+        summaries,
+        lastUpdatedAt: summaries.reduce(
+          (latest, summary) => summary.lastUpdatedAt.getTime() > latest.getTime() ? summary.lastUpdatedAt : latest,
+          new Date(0),
+        ),
+        runningServiceCount: summaries.reduce((count, summary) => count + summary.runningServiceCount, 0),
+      };
+    })
+    .filter((group): group is ProjectWorkspaceGroup => group !== null)
+    .sort((a, b) => {
+      const runningDiff = b.runningServiceCount - a.runningServiceCount;
+      if (runningDiff !== 0) return runningDiff;
+      const updatedDiff = b.lastUpdatedAt.getTime() - a.lastUpdatedAt.getTime();
+      return updatedDiff !== 0 ? updatedDiff : a.project.name.localeCompare(b.project.name);
+    });
+}
+
+export function Workspaces() {
+  const { selectedCompanyId } = useCompany();
+  const { setBreadcrumbs } = useBreadcrumbs();
+  const experimentalSettingsQuery = useQuery({
+    queryKey: queryKeys.instance.experimentalSettings,
+    queryFn: () => instanceSettingsApi.getExperimental(),
+  });
+  const isolatedWorkspacesEnabled = experimentalSettingsQuery.data?.enableIsolatedWorkspaces === true;
+
+  const { data: projects = [], isLoading: projectsLoading, error: projectsError } = useQuery({
+    queryKey: selectedCompanyId ? queryKeys.projects.list(selectedCompanyId) : ["projects", "__workspaces__", "disabled"],
+    queryFn: () => projectsApi.list(selectedCompanyId!),
+    enabled: Boolean(selectedCompanyId && isolatedWorkspacesEnabled),
+  });
+  const { data: issues = [], isLoading: issuesLoading, error: issuesError } = useQuery({
+    queryKey: selectedCompanyId ? queryKeys.issues.list(selectedCompanyId) : ["issues", "__workspaces__", "disabled"],
+    queryFn: () => issuesApi.list(selectedCompanyId!),
+    enabled: Boolean(selectedCompanyId && isolatedWorkspacesEnabled),
+  });
+  const {
+    data: executionWorkspaces = [],
+    isLoading: executionWorkspacesLoading,
+    error: executionWorkspacesError,
+  } = useQuery({
+    queryKey: selectedCompanyId
+      ? queryKeys.executionWorkspaces.list(selectedCompanyId)
+      : ["execution-workspaces", "__workspaces__", "disabled"],
+    queryFn: () => executionWorkspacesApi.list(selectedCompanyId!),
+    enabled: Boolean(selectedCompanyId && isolatedWorkspacesEnabled),
+  });
+
+  useEffect(() => {
+    setBreadcrumbs([{ label: "Workspaces" }]);
+  }, [setBreadcrumbs]);
+
+  const groups = useMemo(
+    () => buildProjectWorkspaceGroups({ projects, issues, executionWorkspaces }),
+    [executionWorkspaces, issues, projects],
+  );
+  const dataLoading = projectsLoading || issuesLoading || executionWorkspacesLoading;
+  const error = (projectsError ?? issuesError ?? executionWorkspacesError) as Error | null;
+
+  if (experimentalSettingsQuery.isLoading) return <PageSkeleton variant="detail" />;
+  if (!isolatedWorkspacesEnabled) return <Navigate to="/issues" replace />;
+  if (dataLoading) return <PageSkeleton variant="list" />;
+  if (error) return <p className="text-sm text-destructive">{error.message}</p>;
+
+  return (
+    <div className="space-y-6">
+      <div>
+        <h2 className="text-xl font-bold">Workspaces</h2>
+      </div>
+
+      {groups.length === 0 ? (
+        <p className="text-sm text-muted-foreground">No workspace activity yet.</p>
+      ) : (
+        <div className="space-y-8">
+          {groups.map((group) => (
+            <section key={group.project.id} className="space-y-3">
+              <div className="flex flex-wrap items-end justify-between gap-2">
+                <div className="min-w-0">
+                  <Link
+                    to={`/projects/${group.projectRef}/workspaces`}
+                    className="text-base font-semibold hover:underline"
+                  >
+                    {group.project.name}
+                  </Link>
+                  {group.project.description ? (
+                    <p className="mt-1 line-clamp-2 text-sm text-muted-foreground">
+                      {group.project.description}
+                    </p>
+                  ) : null}
+                </div>
+                <span className="text-xs text-muted-foreground">
+                  {group.summaries.length} workspace{group.summaries.length === 1 ? "" : "s"}
+                </span>
+              </div>
+              <ProjectWorkspacesContent
+                companyId={selectedCompanyId!}
+                projectId={group.project.id}
+                projectRef={group.projectRef}
+                summaries={group.summaries}
+              />
+            </section>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}