app/src/App.tsx

@@ -21,7 +21,9 @@ import { useTerminal } from "./hooks/useTerminal";
 import { useSTT } from "./hooks/useSTT";
 import { useContainerProgress } from "./hooks/useContainerProgress";
 import { useKeyboardShortcuts } from "./hooks/useKeyboardShortcuts";
-import { useAppState, isHomeTab, tabKeyId, homeTabKey } from "./store/appState";
+import { useMarketplaceSyncToasts } from "./hooks/useMarketplace";
+import MarketplaceView from "./components/marketplace/MarketplaceView";
+import { useAppState, isHomeTab, tabKeyId, homeTabKey, MARKETPLACE_TAB_KEY } from "./store/appState";
 import { reconcileProjectStatuses } from "./lib/tauri-commands";
 
 export default function App() {
@@ -72,6 +74,7 @@ export default function App() {
 
   useContainerProgress();
   useKeyboardShortcuts();
+  useMarketplaceSyncToasts();
 
   // Initialize on mount
   useEffect(() => {
@@ -159,6 +162,11 @@ export default function App() {
                   />
                 </PaneVisibilityProvider>
               ))}
+              {tabOrder.includes(MARKETPLACE_TAB_KEY) && (
+                <PaneVisibilityProvider visible={activeTabKey === MARKETPLACE_TAB_KEY}>
+                  <MarketplaceView active={activeTabKey === MARKETPLACE_TAB_KEY} />
+                </PaneVisibilityProvider>
+              )}
             </div>
           )}
         </main>

app/src/components/layout/MainTabs.test.tsx

@@ -1,7 +1,7 @@
 import { describe, it, expect, vi, beforeEach } from "vitest";
 import { fireEvent, render, screen } from "@testing-library/react";
 import MainTabs from "./MainTabs";
-import { useAppState, homeTabKey, terminalTabKey } from "../../store/appState";
+import { useAppState, homeTabKey, terminalTabKey, MARKETPLACE_TAB_KEY } from "../../store/appState";
 import type { Project, TerminalSession } from "../../lib/types";
 
 const close = vi.fn();
@@ -265,3 +265,20 @@ describe("MainTabs reordering", () => {
     }
   });
 });
+
+describe("marketplace tab", () => {
+  beforeEach(() => {
+    useAppState.setState({
+      tabOrder: [HOME, MARKETPLACE_TAB_KEY],
+      activeTabKey: MARKETPLACE_TAB_KEY,
+      activeSessionId: null,
+    });
+  });
+
+  it("renders a Marketplace tab that closes", () => {
+    render(<MainTabs />);
+    expect(screen.getByRole("tab", { name: /marketplace/i })).toHaveAttribute("aria-selected", "true");
+    fireEvent.click(screen.getByRole("button", { name: "Close Marketplace tab" }));
+    expect(useAppState.getState().tabOrder).toEqual([HOME]);
+  });
+});

app/src/components/layout/MainTabs.tsx

@@ -5,6 +5,7 @@ import { useProjects } from "../../hooks/useProjects";
 import {
   useAppState,
   isHomeTab,
+  isMarketplaceTab,
   tabKeyId,
   terminalTabKey,
 } from "../../store/appState";
@@ -41,12 +42,13 @@ const MODE_BADGE: Record<PermissionMode, { text: string; className: string }> =
 export default function MainTabs() {
   const { sessions, close } = useTerminal();
   const { projects, update } = useProjects();
-  const { tabOrder, activeTabKey, setActiveTabKey, closeHomeTab, moveTab } = useAppState(
+  const { tabOrder, activeTabKey, setActiveTabKey, closeHomeTab, closeMarketplaceTab, moveTab } = useAppState(
     useShallow((s) => ({
       tabOrder: s.tabOrder,
       activeTabKey: s.activeTabKey,
       setActiveTabKey: s.setActiveTabKey,
       closeHomeTab: s.closeHomeTab,
+      closeMarketplaceTab: s.closeMarketplaceTab,
       moveTab: s.moveTab,
     })),
   );
@@ -192,6 +194,7 @@ export default function MainTabs() {
    * worse than no ghost.
    */
   const tabLabel = (key: string): string => {
+    if (isMarketplaceTab(key)) return "Marketplace";
     if (isHomeTab(key)) {
       return projects.find((p) => p.id === tabKeyId(key))?.name ?? "";
     }
@@ -272,7 +275,7 @@ export default function MainTabs() {
         x: e.clientX - drag.offsetX,
         y: drag.top,
         label: tabLabel(drag.key),
-        icon: isHomeTab(drag.key) ? "⌂" : "▣",
+        icon: isMarketplaceTab(drag.key) ? "◈" : isHomeTab(drag.key) ? "⌂" : "▣",
       });
     },
     onPointerUp: (e: React.PointerEvent<HTMLDivElement>) => {
@@ -314,6 +317,41 @@ export default function MainTabs() {
   const renderTab = (key: string, index: number) => {
     const active = activeTabKey === key;
 
+    if (isMarketplaceTab(key)) {
+      return (
+        <div
+          role="tab"
+          aria-selected={active}
+          tabIndex={0}
+          data-tab-index={index}
+          onClick={() => activateTab(key)}
+          onKeyDown={(e) => {
+            if (e.key === "Enter" || e.key === " ") {
+              e.preventDefault();
+              setActiveTabKey(key);
+            }
+          }}
+          {...pointerProps(key, false)}
+          className={tabClass(active, dragKey === key)}
+        >
+          <span aria-hidden="true" className="text-[var(--text-secondary)]">◈</span>
+          <span className="truncate max-w-[160px]">Marketplace</span>
+          <button
+            type="button"
+            onClick={(e) => {
+              e.stopPropagation();
+              closeMarketplaceTab();
+            }}
+            aria-label="Close Marketplace tab"
+            title="Close tab"
+            className="w-6 h-6 flex items-center justify-center rounded-[var(--radius-control)] text-[var(--text-secondary)] hover:text-[var(--error)] hover:bg-[var(--bg-tertiary)] transition-colors"
+          >
+            <span aria-hidden="true">×</span>
+          </button>
+        </div>
+      );
+    }
+
     if (isHomeTab(key)) {
       const projectId = tabKeyId(key);
       const project = projects.find((p) => p.id === projectId);

app/src/components/layout/NotesDock.tsx

@@ -78,7 +78,7 @@ export default function NotesDock() {
   if (!notesDockOpen) return null;
 
   // Follow whatever is in front: a home tab is its own project, a terminal tab
-  // is the project it belongs to.
+  // is the project it belongs to. The Marketplace tab belongs to no project.
   let projectId: string | null = null;
   if (activeTabKey && isHomeTab(activeTabKey)) {
     projectId = tabKeyId(activeTabKey);

app/src/components/marketplace/AccountsPane.tsx

@@ -0,0 +1,11 @@
+import type { MarketplaceApi } from "../../hooks/useMarketplace";
+import { useAppState } from "../../store/appState";
+
+export default function AccountsPane(_props: { mp: MarketplaceApi }) {
+  const count = useAppState((s) => s.appSettings?.marketplace_accounts.length ?? 0);
+  return (
+    <p className="p-4 text-xs text-[var(--text-secondary)]">
+      {count} account{count === 1 ? "" : "s"}.
+    </p>
+  );
+}

app/src/components/marketplace/BrowsePane.tsx

@@ -0,0 +1,9 @@
+import type { MarketplaceApi } from "../../hooks/useMarketplace";
+
+export default function BrowsePane({ mp }: { mp: MarketplaceApi }) {
+  return (
+    <p className="p-4 text-xs text-[var(--text-secondary)]">
+      {mp.snapshots.length} marketplace{mp.snapshots.length === 1 ? "" : "s"} configured.
+    </p>
+  );
+}

app/src/components/marketplace/InstalledPane.tsx

@@ -0,0 +1,9 @@
+import type { MarketplaceApi } from "../../hooks/useMarketplace";
+
+export default function InstalledPane({ mp }: { mp: MarketplaceApi }) {
+  return (
+    <p className="p-4 text-xs text-[var(--text-secondary)]">
+      {mp.updates.length} update{mp.updates.length === 1 ? "" : "s"} available.
+    </p>
+  );
+}

app/src/components/marketplace/MarketplaceView.test.tsx

@@ -0,0 +1,45 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+
+const load = vi.fn(async () => {});
+vi.mock("../../hooks/useMarketplace", () => ({
+  useMarketplace: () => ({
+    snapshots: [],
+    updates: [],
+    loading: false,
+    refreshing: [],
+    load,
+    refresh: vi.fn(),
+    reloadState: vi.fn(),
+    install: vi.fn(),
+    uninstall: vi.fn(),
+    setDisabled: vi.fn(),
+    update: vi.fn(),
+    forget: vi.fn(),
+    remove: vi.fn(),
+  }),
+}));
+vi.mock("./BrowsePane", () => ({ default: () => <div>browse pane</div> }));
+vi.mock("./InstalledPane", () => ({ default: () => <div>installed pane</div> }));
+vi.mock("./AccountsPane", () => ({ default: () => <div>accounts pane</div> }));
+
+import MarketplaceView from "./MarketplaceView";
+
+describe("MarketplaceView", () => {
+  beforeEach(() => vi.clearAllMocks());
+
+  it("loads with stale refresh when first shown and switches sub-tabs", async () => {
+    render(<MarketplaceView active />);
+    await waitFor(() => expect(load).toHaveBeenCalledWith({ refreshStale: true }));
+    expect(screen.getByText("browse pane")).toBeInTheDocument();
+    fireEvent.click(screen.getByRole("tab", { name: "Installed" }));
+    expect(screen.getByText("installed pane")).toBeInTheDocument();
+    fireEvent.click(screen.getByRole("tab", { name: "Accounts" }));
+    expect(screen.getByText("accounts pane")).toBeInTheDocument();
+  });
+
+  it("does not load while hidden", () => {
+    render(<MarketplaceView active={false} />);
+    expect(load).not.toHaveBeenCalled();
+  });
+});

app/src/components/marketplace/MarketplaceView.tsx

@@ -0,0 +1,67 @@
+import { useEffect, useRef, useState } from "react";
+import { useMarketplace } from "../../hooks/useMarketplace";
+import BrowsePane from "./BrowsePane";
+import InstalledPane from "./InstalledPane";
+import AccountsPane from "./AccountsPane";
+
+const SUB_TABS = [
+  { id: "browse", label: "Browse" },
+  { id: "installed", label: "Installed" },
+  { id: "accounts", label: "Accounts" },
+] as const;
+
+export type MarketplaceSubTab = (typeof SUB_TABS)[number]["id"];
+
+interface Props {
+  active: boolean;
+}
+
+export default function MarketplaceView({ active }: Props) {
+  const mp = useMarketplace();
+  const [tab, setTab] = useState<MarketplaceSubTab>("browse");
+  const { load } = mp;
+  const wasActive = useRef(false);
+
+  // Load (and refresh stale marketplaces) each time the tab comes to the front.
+  useEffect(() => {
+    if (active && !wasActive.current) void load({ refreshStale: true });
+    wasActive.current = active;
+  }, [active, load]);
+
+  return (
+    <div className={`w-full h-full flex flex-col min-h-0 ${active ? "" : "hidden"}`}>
+      <div
+        role="tablist"
+        aria-label="Marketplace sections"
+        className="flex gap-1 px-3 pt-3 border-b border-[var(--border-color)]"
+      >
+        {SUB_TABS.map((t) => (
+          <button
+            key={t.id}
+            type="button"
+            role="tab"
+            aria-selected={tab === t.id}
+            onClick={() => setTab(t.id)}
+            className={`px-3 py-1.5 text-xs rounded-t-[var(--radius-control)] ${
+              tab === t.id
+                ? "bg-[var(--bg-primary)] text-[var(--text-primary)]"
+                : "text-[var(--text-secondary)] hover:text-[var(--text-primary)]"
+            }`}
+          >
+            {t.label}
+            {t.id === "installed" && mp.updates.length > 0 && (
+              <span className="ml-1.5 px-1 rounded-[4px] text-[10px] bg-[var(--accent-muted)] text-[var(--accent)]">
+                {mp.updates.length}
+              </span>
+            )}
+          </button>
+        ))}
+      </div>
+      <div className="flex-1 min-h-0 overflow-auto">
+        {tab === "browse" && <BrowsePane mp={mp} />}
+        {tab === "installed" && <InstalledPane mp={mp} />}
+        {tab === "accounts" && <AccountsPane mp={mp} />}
+      </div>
+    </div>
+  );
+}

app/src/components/settings/MarketplaceSettings.test.tsx

@@ -0,0 +1,42 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+import MarketplaceSettings from "./MarketplaceSettings";
+import { useAppState, MARKETPLACE_TAB_KEY } from "../../store/appState";
+import type { AppSettings } from "../../lib/types";
+
+const listMarketplaceUpdates = vi.fn();
+vi.mock("../../lib/tauri-commands", () => ({
+  listMarketplaceUpdates: () => listMarketplaceUpdates(),
+}));
+
+describe("MarketplaceSettings", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    useAppState.setState({
+      tabOrder: [],
+      activeTabKey: null,
+      appSettings: {
+        marketplaces: [{ id: "m1", name: "Starter", url: "https://x/y.git", branch: null, account_id: null }],
+        global_marketplace_installs: [
+          { marketplace_id: "m1", kind: "agent", key: "a", commit: "a".repeat(40) },
+          { marketplace_id: "m1", kind: "hook", key: "h", commit: "a".repeat(40) },
+        ],
+        marketplace_accounts: [],
+      } as unknown as AppSettings,
+    });
+    listMarketplaceUpdates.mockResolvedValue([
+      { item: { marketplace_id: "m1", kind: "agent", key: "a" }, pinned: "a".repeat(40), head: "b".repeat(40) },
+    ]);
+  });
+
+  it("summarises and opens the Marketplace tab", async () => {
+    render(<MarketplaceSettings />);
+    expect(screen.getByTestId("marketplace-summary")).toHaveTextContent("1 marketplace");
+    expect(screen.getByTestId("marketplace-summary")).toHaveTextContent("2 installed for all projects");
+    await waitFor(() =>
+      expect(screen.getByTestId("marketplace-summary")).toHaveTextContent("1 update available"),
+    );
+    fireEvent.click(screen.getByRole("button", { name: "Open Marketplace" }));
+    expect(useAppState.getState().activeTabKey).toBe(MARKETPLACE_TAB_KEY);
+  });
+});

app/src/components/settings/MarketplaceSettings.tsx

@@ -0,0 +1,48 @@
+import { useEffect, useState } from "react";
+import { useAppState } from "../../store/appState";
+import { listMarketplaceUpdates } from "../../lib/tauri-commands";
+import Button from "../ui/Button";
+
+const plural = (n: number, one: string, many: string) => `${n} ${n === 1 ? one : many}`;
+
+export default function MarketplaceSettings() {
+  const appSettings = useAppState((s) => s.appSettings);
+  const openMarketplace = useAppState((s) => s.openMarketplace);
+  const [updateCount, setUpdateCount] = useState<number | null>(null);
+
+  useEffect(() => {
+    let cancelled = false;
+    listMarketplaceUpdates()
+      .then((u) => {
+        if (!cancelled) setUpdateCount(u.length);
+      })
+      .catch(() => {
+        if (!cancelled) setUpdateCount(null);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, [appSettings?.marketplaces.length]);
+
+  const marketplaces = appSettings?.marketplaces.length ?? 0;
+  const globalInstalls = appSettings?.global_marketplace_installs.length ?? 0;
+
+  return (
+    <div className="space-y-2">
+      <p data-testid="marketplace-summary" className="text-xs text-[var(--text-secondary)] leading-snug">
+        {plural(marketplaces, "marketplace", "marketplaces")} ·{" "}
+        {globalInstalls} installed for all projects
+        {updateCount !== null && updateCount > 0 && (
+          <> · {plural(updateCount, "update available", "updates available")}</>
+        )}
+      </p>
+      <p className="text-xs text-[var(--text-secondary)] leading-snug">
+        Agents, skills, commands, hooks and plugins from git repositories, installed for all
+        projects or per project. Changes apply to new Claude sessions.
+      </p>
+      <Button size="md" variant="secondary" onClick={() => openMarketplace()}>
+        Open Marketplace
+      </Button>
+    </div>
+  );
+}

app/src/components/settings/SettingsPanel.tsx

@@ -20,6 +20,7 @@ import { resolveTerminalGpuRendering } from "../../lib/terminalRenderer";
 import WebTerminalSettings from "./WebTerminalSettings";
 import SttSettings from "./SttSettings";
 import SharedAuthSettings from "./SharedAuthSettings";
+import MarketplaceSettings from "./MarketplaceSettings";
 import CertificateSettings from "./CertificateSettings";
 import ExportSettingsModal from "./ExportSettingsModal";
 import ImportSettingsModal from "./ImportSettingsModal";
@@ -171,6 +172,10 @@ export default function SettingsPanel() {
         <SharedAuthSettings />
       </AccordionSection>
 
+      <AccordionSection id="marketplace" title="Marketplace" defaultOpen={false}>
+        <MarketplaceSettings />
+      </AccordionSection>
+
       <AccordionSection id="backends" title="Backends" defaultOpen={false}>
         <AwsSettings />
         <div className="pt-3 border-t border-[var(--border-color)]" />

app/src/hooks/useKeyboardShortcuts.test.tsx

@@ -1,7 +1,7 @@
 import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
 import { renderHook } from "@testing-library/react";
 import { useKeyboardShortcuts } from "./useKeyboardShortcuts";
-import { useAppState, homeTabKey, terminalTabKey } from "../store/appState";
+import { useAppState, homeTabKey, terminalTabKey, MARKETPLACE_TAB_KEY } from "../store/appState";
 
 vi.mock("./useTerminal", () => ({
   useTerminal: () => ({ open: vi.fn(), close: vi.fn() }),
@@ -86,3 +86,16 @@ describe("Ctrl+Shift+←/→", () => {
     expect(order()).toEqual([HOME, S1, S2]);
   });
 });
+
+describe("Ctrl+Shift+W on the Marketplace tab", () => {
+  it("closes the Marketplace tab", () => {
+    useAppState.setState({
+      tabOrder: [HOME, MARKETPLACE_TAB_KEY],
+      activeTabKey: MARKETPLACE_TAB_KEY,
+      activeSessionId: null,
+    });
+    renderHook(() => useKeyboardShortcuts());
+    press("W", { shift: true });
+    expect(useAppState.getState().tabOrder).toEqual([HOME]);
+  });
+});

app/src/hooks/useKeyboardShortcuts.ts

@@ -1,5 +1,5 @@
 import { useEffect } from "react";
-import { useAppState, isTerminalTab, tabKeyId } from "../store/appState";
+import { useAppState, isMarketplaceTab, isTerminalTab, tabKeyId } from "../store/appState";
 import { useTerminal } from "./useTerminal";
 
 /**
@@ -62,6 +62,8 @@ export function useKeyboardShortcuts() {
           closeTerminal(tabKeyId(key)).catch((err) =>
             console.error("Failed to close terminal:", err),
           );
+        } else if (isMarketplaceTab(key)) {
+          state.closeMarketplaceTab();
         } else {
           state.closeHomeTab(tabKeyId(key));
         }

app/src/hooks/useMarketplace.test.ts

@@ -0,0 +1,120 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { act, renderHook, waitFor } from "@testing-library/react";
+import { useAppState } from "../store/appState";
+import type { AppSettings, MarketplaceSnapshot } from "../lib/types";
+
+const listMarketplaceSnapshots = vi.fn();
+const refreshMarketplaces = vi.fn();
+const listMarketplaceUpdates = vi.fn();
+const getSettings = vi.fn();
+const listProjects = vi.fn();
+const installMarketplaceItem = vi.fn();
+
+vi.mock("../lib/tauri-commands", () => ({
+  listMarketplaceSnapshots: () => listMarketplaceSnapshots(),
+  refreshMarketplaces: (id?: string) => refreshMarketplaces(id),
+  listMarketplaceUpdates: () => listMarketplaceUpdates(),
+  getSettings: () => getSettings(),
+  listProjects: () => listProjects(),
+  installMarketplaceItem: (...a: unknown[]) => installMarketplaceItem(...a),
+}));
+
+let syncHandler: ((e: { payload: unknown }) => void) | null = null;
+vi.mock("@tauri-apps/api/event", () => ({
+  listen: vi.fn(async (_name: string, cb: (e: { payload: unknown }) => void) => {
+    syncHandler = cb;
+    return vi.fn();
+  }),
+}));
+
+import { useMarketplace, useMarketplaceSyncToasts } from "./useMarketplace";
+
+const snap = (id: string, fetched_at: string | null): MarketplaceSnapshot => ({
+  marketplace_id: id,
+  head_commit: null,
+  fetched_at,
+  fetch_error: null,
+  items: [],
+});
+
+describe("useMarketplace", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    useAppState.setState({ toasts: [], appSettings: { marketplaces: [] } as unknown as AppSettings });
+    listMarketplaceUpdates.mockResolvedValue([]);
+    getSettings.mockResolvedValue({ marketplaces: [] });
+    listProjects.mockResolvedValue([]);
+  });
+
+  it("loads snapshots and refreshes only stale ones", async () => {
+    const fresh = snap("m1", new Date().toISOString());
+    const stale = snap("m2", null);
+    listMarketplaceSnapshots.mockResolvedValue([fresh, stale]);
+    refreshMarketplaces.mockResolvedValue([{ ...stale, fetched_at: new Date().toISOString() }]);
+
+    const { result } = renderHook(() => useMarketplace());
+    await act(() => result.current.load({ refreshStale: true }));
+
+    expect(refreshMarketplaces).toHaveBeenCalledTimes(1);
+    expect(refreshMarketplaces).toHaveBeenCalledWith("m2");
+    expect(result.current.snapshots.map((s) => s.marketplace_id)).toEqual(["m1", "m2"]);
+    expect(result.current.snapshots[1].fetched_at).not.toBeNull();
+  });
+
+  it("toasts and reloads after a failed mutation", async () => {
+    listMarketplaceSnapshots.mockResolvedValue([]);
+    installMarketplaceItem.mockRejectedValue("boom");
+    const { result } = renderHook(() => useMarketplace());
+    const ok = await act(() =>
+      result.current.install({ marketplace_id: "m1", kind: "agent", key: "a" }, { type: "global" }),
+    );
+    expect(ok).toBe(false);
+    expect(useAppState.getState().toasts[0]).toMatchObject({ kind: "error", detail: "boom" });
+  });
+});
+
+describe("useMarketplaceSyncToasts", () => {
+  beforeEach(() => {
+    syncHandler = null;
+    useAppState.setState({
+      toasts: [],
+      projects: [{ id: "p1", name: "api" }] as never,
+    });
+  });
+
+  it("toasts a sync with errors and stays quiet on a clean one", async () => {
+    renderHook(() => useMarketplaceSyncToasts());
+    await waitFor(() => expect(syncHandler).not.toBeNull());
+
+    act(() =>
+      syncHandler!({
+        payload: {
+          project_id: "p1",
+          report: { installed: ["agent:a"], updated: [], removed: [], skipped: [], errors: [], finished_at: "" },
+        },
+      }),
+    );
+    expect(useAppState.getState().toasts).toHaveLength(0);
+
+    act(() =>
+      syncHandler!({
+        payload: {
+          project_id: "p1",
+          report: {
+            installed: [],
+            updated: [],
+            removed: [],
+            skipped: [{ item: "agent:a", reason: "a file you created has the same name" }],
+            errors: ["claude plugin install failed"],
+            finished_at: "",
+          },
+        },
+      }),
+    );
+    const toast = useAppState.getState().toasts[0];
+    expect(toast.kind).toBe("error");
+    expect(toast.message).toContain("api");
+    expect(toast.detail).toContain("claude plugin install failed");
+    expect(toast.detail).toContain("agent:a");
+  });
+});

app/src/hooks/useMarketplace.ts

@@ -0,0 +1,208 @@
+import { useCallback, useEffect, useState } from "react";
+import { listen, type UnlistenFn } from "@tauri-apps/api/event";
+import * as commands from "../lib/tauri-commands";
+import { useAppState } from "../store/appState";
+import { isStale } from "../lib/marketplace";
+import type {
+  InstallScope,
+  ItemUpdate,
+  MarketplaceItemRef,
+  MarketplaceSnapshot,
+  SyncReport,
+} from "../lib/types";
+
+export interface MarketplaceApi {
+  snapshots: MarketplaceSnapshot[];
+  updates: ItemUpdate[];
+  loading: boolean;
+  /** Ids of marketplaces currently being fetched. */
+  refreshing: string[];
+  load: (opts?: { refreshStale?: boolean }) => Promise<void>;
+  refresh: (marketplaceId?: string) => Promise<void>;
+  /** Reload settings, projects and the update list after a mutation. */
+  reloadState: () => Promise<void>;
+  install: (item: MarketplaceItemRef, scope: InstallScope) => Promise<boolean>;
+  uninstall: (item: MarketplaceItemRef, scope: InstallScope) => Promise<boolean>;
+  setDisabled: (projectId: string, item: MarketplaceItemRef, disabled: boolean) => Promise<boolean>;
+  update: (item: MarketplaceItemRef, scope: InstallScope) => Promise<boolean>;
+  forget: (marketplaceId: string) => Promise<boolean>;
+  remove: (marketplaceId: string) => Promise<boolean>;
+}
+
+function errorText(e: unknown): string {
+  return typeof e === "string" ? e : e instanceof Error ? e.message : String(e);
+}
+
+export function useMarketplace(): MarketplaceApi {
+  const setAppSettings = useAppState((s) => s.setAppSettings);
+  const setProjects = useAppState((s) => s.setProjects);
+  const pushToast = useAppState((s) => s.pushToast);
+  const [snapshots, setSnapshots] = useState<MarketplaceSnapshot[]>([]);
+  const [updates, setUpdates] = useState<ItemUpdate[]>([]);
+  const [loading, setLoading] = useState(false);
+  const [refreshing, setRefreshing] = useState<string[]>([]);
+
+  const merge = useCallback((fresh: MarketplaceSnapshot[]) => {
+    setSnapshots((prev) => {
+      const byId = new Map(prev.map((s) => [s.marketplace_id, s]));
+      for (const s of fresh) byId.set(s.marketplace_id, s);
+      return [...byId.values()];
+    });
+  }, []);
+
+  const loadUpdates = useCallback(async () => {
+    try {
+      setUpdates(await commands.listMarketplaceUpdates());
+    } catch (e) {
+      console.error("Failed to list marketplace updates:", e);
+    }
+  }, []);
+
+  const refresh = useCallback(
+    async (marketplaceId?: string) => {
+      const ids = marketplaceId ? [marketplaceId] : snapshots.map((s) => s.marketplace_id);
+      setRefreshing((r) => [...new Set([...r, ...ids])]);
+      try {
+        merge(await commands.refreshMarketplaces(marketplaceId));
+        await loadUpdates();
+      } catch (e) {
+        pushToast({ kind: "error", message: "Could not refresh the marketplace", detail: errorText(e) });
+      } finally {
+        setRefreshing((r) => r.filter((id) => !ids.includes(id)));
+      }
+    },
+    [snapshots, merge, loadUpdates, pushToast],
+  );
+
+  const load = useCallback(
+    async (opts: { refreshStale?: boolean } = {}) => {
+      setLoading(true);
+      try {
+        const list = await commands.listMarketplaceSnapshots();
+        setSnapshots(list);
+        await loadUpdates();
+        if (opts.refreshStale) {
+          const now = Date.now();
+          const stale = list.filter((s) => isStale(s, now)).map((s) => s.marketplace_id);
+          if (stale.length > 0) {
+            setRefreshing(stale);
+            try {
+              // One call per marketplace so one slow or failing repo does not hold up the rest.
+              await Promise.all(
+                stale.map(async (id) => {
+                  try {
+                    merge(await commands.refreshMarketplaces(id));
+                  } finally {
+                    setRefreshing((r) => r.filter((x) => x !== id));
+                  }
+                }),
+              );
+            } finally {
+              await loadUpdates();
+            }
+          }
+        }
+      } catch (e) {
+        pushToast({ kind: "error", message: "Could not load marketplaces", detail: errorText(e) });
+      } finally {
+        setLoading(false);
+      }
+    },
+    [merge, loadUpdates, pushToast],
+  );
+
+  const reloadState = useCallback(async () => {
+    const [settings, projects] = await Promise.all([commands.getSettings(), commands.listProjects()]);
+    setAppSettings(settings);
+    setProjects(projects);
+    await loadUpdates();
+  }, [setAppSettings, setProjects, loadUpdates]);
+
+  /** Run a mutation; on failure toast it. Always resync local state afterwards. */
+  const mutate = useCallback(
+    async (label: string, run: () => Promise<unknown>): Promise<boolean> => {
+      let ok = true;
+      try {
+        await run();
+      } catch (e) {
+        ok = false;
+        pushToast({ kind: "error", message: label, detail: errorText(e) });
+      }
+      try {
+        await reloadState();
+      } catch (e) {
+        console.error("Failed to reload after marketplace change:", e);
+      }
+      return ok;
+    },
+    [reloadState, pushToast],
+  );
+
+  return {
+    snapshots,
+    updates,
+    loading,
+    refreshing,
+    load,
+    refresh,
+    reloadState,
+    install: (item, scope) =>
+      mutate(`Could not install ${item.key}`, () => commands.installMarketplaceItem(item, scope)),
+    uninstall: (item, scope) =>
+      mutate(`Could not remove ${item.key}`, () => commands.uninstallMarketplaceItem(item, scope)),
+    setDisabled: (projectId, item, disabled) =>
+      mutate(`Could not change ${item.key} for this project`, () =>
+        commands.setGlobalItemDisabled(projectId, item, disabled),
+      ),
+    update: (item, scope) =>
+      mutate(`Could not update ${item.key}`, () => commands.updateMarketplaceItem(item, scope)),
+    forget: (marketplaceId) =>
+      mutate("Could not forget those installs", () => commands.forgetMarketplaceInstalls(marketplaceId)),
+    remove: async (marketplaceId) => {
+      const ok = await mutate("Could not remove the marketplace", () =>
+        commands.removeMarketplace(marketplaceId),
+      );
+      if (ok) setSnapshots((prev) => prev.filter((s) => s.marketplace_id !== marketplaceId));
+      return ok;
+    },
+  };
+}
+
+interface SyncFinishedEvent {
+  project_id: string;
+  report: SyncReport;
+}
+
+/**
+ * App-wide: toast when a marketplace sync (container start or "Apply now")
+ * reports errors or skipped items. A clean sync is silent.
+ */
+export function useMarketplaceSyncToasts() {
+  useEffect(() => {
+    let cancelled = false;
+    let unlisten: UnlistenFn | null = null;
+    void listen<SyncFinishedEvent>("marketplace-sync-finished", (event) => {
+      const { project_id, report } = event.payload;
+      if (report.errors.length === 0 && report.skipped.length === 0) return;
+      const state = useAppState.getState();
+      const name = state.projects.find((p) => p.id === project_id)?.name ?? project_id;
+      const lines = [
+        ...report.errors,
+        ...report.skipped.map((s) => `${s.item}: ${s.reason}`),
+      ];
+      state.pushToast({
+        kind: report.errors.length > 0 ? "error" : "info",
+        message: `Marketplace sync for “${name}” ${report.errors.length > 0 ? "had errors" : "skipped items"}`,
+        detail: lines.join("\n"),
+        dedupeKey: `marketplace-sync-${project_id}`,
+      });
+    }).then((fn) => {
+      if (cancelled) fn();
+      else unlisten = fn;
+    });
+    return () => {
+      cancelled = true;
+      unlisten?.();
+    };
+  }, []);
+}

app/src/lib/marketplace.test.ts

@@ -0,0 +1,113 @@
+import { describe, it, expect } from "vitest";
+import {
+  effectiveInstalls,
+  formatItemRef,
+  isStale,
+  itemRefKey,
+  projectItemState,
+  STALE_AFTER_MS,
+} from "./marketplace";
+import type { MarketplaceInstall, MarketplaceSnapshot, Project } from "./types";
+
+const A = "a".repeat(40);
+const B = "b".repeat(40);
+
+const inst = (key: string, commit = A, kind: MarketplaceInstall["kind"] = "agent"): MarketplaceInstall => ({
+  marketplace_id: "m1",
+  kind,
+  key,
+  commit,
+});
+
+const project = (patch: Partial<Project> = {}): Project =>
+  ({
+    id: "p1",
+    name: "api",
+    marketplace_installs: [],
+    marketplace_disabled: [],
+    ...patch,
+  }) as unknown as Project;
+
+describe("itemRefKey / formatItemRef", () => {
+  it("keys and formats a ref", () => {
+    const r = { marketplace_id: "m1", kind: "hook" as const, key: "notify" };
+    expect(itemRefKey(r)).toBe("m1/hook/notify");
+    expect(formatItemRef(r)).toBe("hook:notify");
+  });
+});
+
+describe("projectItemState", () => {
+  const ref = { marketplace_id: "m1", kind: "agent" as const, key: "rev" };
+
+  it("is none when nothing installs it", () => {
+    expect(projectItemState(ref, [], project())).toBe("none");
+  });
+
+  it("is inherited from a global install", () => {
+    expect(projectItemState(ref, [inst("rev")], project())).toBe("inherited");
+  });
+
+  it("is opted_out when the project disabled the global install", () => {
+    const p = project({ marketplace_disabled: [ref] });
+    expect(projectItemState(ref, [inst("rev")], p)).toBe("opted_out");
+  });
+
+  it("is project for a project-only install", () => {
+    const p = project({ marketplace_installs: [inst("rev")] });
+    expect(projectItemState(ref, [], p)).toBe("project");
+  });
+
+  it("is project when project and global share the pin", () => {
+    const p = project({ marketplace_installs: [inst("rev", A)] });
+    expect(projectItemState(ref, [inst("rev", A)], p)).toBe("project");
+  });
+
+  it("flags a project pin that differs from the global pin", () => {
+    const p = project({ marketplace_installs: [inst("rev", B)] });
+    expect(projectItemState(ref, [inst("rev", A)], p)).toBe("project_pinned_differently");
+  });
+
+  it("does not confuse kinds with the same key", () => {
+    expect(projectItemState(ref, [inst("rev", A, "skill")], project())).toBe("none");
+  });
+});
+
+describe("effectiveInstalls", () => {
+  it("merges global minus disabled plus project, project winning", () => {
+    const disabledRef = { marketplace_id: "m1", kind: "agent" as const, key: "off" };
+    const p = project({
+      marketplace_disabled: [disabledRef],
+      marketplace_installs: [inst("both", B), inst("mine")],
+    });
+    const out = effectiveInstalls([inst("glob"), inst("off"), inst("both", A)], p);
+    expect(out.map((i) => [i.key, i.commit, i.source])).toEqual([
+      ["both", B, "project"],
+      ["glob", A, "global"],
+      ["mine", A, "project"],
+    ]);
+  });
+});
+
+describe("isStale", () => {
+  const snap = (fetched_at: string | null): MarketplaceSnapshot => ({
+    marketplace_id: "m1",
+    head_commit: null,
+    fetched_at,
+    fetch_error: null,
+    items: [],
+  });
+  const now = Date.parse("2026-09-27T12:00:00Z");
+
+  it("treats a never-fetched snapshot as stale", () => {
+    expect(isStale(snap(null), now)).toBe(true);
+  });
+
+  it("is fresh within 15 minutes and stale after", () => {
+    expect(isStale(snap(new Date(now - STALE_AFTER_MS + 1000).toISOString()), now)).toBe(false);
+    expect(isStale(snap(new Date(now - STALE_AFTER_MS - 1000).toISOString()), now)).toBe(true);
+  });
+
+  it("treats an unparsable timestamp as stale", () => {
+    expect(isStale(snap("not a date"), now)).toBe(true);
+  });
+});

app/src/lib/marketplace.ts

@@ -0,0 +1,75 @@
+import type {
+  ItemKind,
+  MarketplaceInstall,
+  MarketplaceItemRef,
+  MarketplaceSnapshot,
+  Project,
+} from "./types";
+
+/** How a project relates to one marketplace item. */
+export type ProjectItemState =
+  | "none"
+  | "inherited"
+  | "opted_out"
+  | "project"
+  | "project_pinned_differently";
+
+export const KIND_ORDER: ItemKind[] = ["agent", "skill", "command", "hook", "plugin"];
+
+export const KIND_LABELS: Record<ItemKind, string> = {
+  agent: "Agents",
+  skill: "Skills",
+  command: "Commands",
+  hook: "Hooks",
+  plugin: "Plugins",
+};
+
+/** A marketplace is refreshed when its tab opens if the last fetch is older than this. */
+export const STALE_AFTER_MS = 15 * 60 * 1000;
+
+export const itemRefKey = (r: MarketplaceItemRef) => `${r.marketplace_id}/${r.kind}/${r.key}`;
+
+/** Same shape as the item strings in a `SyncReport`. */
+export const formatItemRef = (r: MarketplaceItemRef) => `${r.kind}:${r.key}`;
+
+const sameItem = (a: MarketplaceItemRef, b: MarketplaceItemRef) =>
+  a.marketplace_id === b.marketplace_id && a.kind === b.kind && a.key === b.key;
+
+export function projectItemState(
+  item: MarketplaceItemRef,
+  globalInstalls: MarketplaceInstall[],
+  project: Project,
+): ProjectItemState {
+  const own = project.marketplace_installs.find((i) => sameItem(i, item));
+  const global = globalInstalls.find((i) => sameItem(i, item));
+  if (own) {
+    return global && global.commit !== own.commit ? "project_pinned_differently" : "project";
+  }
+  if (!global) return "none";
+  return project.marketplace_disabled.some((d) => sameItem(d, item)) ? "opted_out" : "inherited";
+}
+
+/** Mirror of the backend's `effective_installs`, tagged with where each install comes from. */
+export function effectiveInstalls(
+  globalInstalls: MarketplaceInstall[],
+  project: Project,
+): (MarketplaceInstall & { source: "global" | "project" })[] {
+  const byKey = new Map<string, MarketplaceInstall & { source: "global" | "project" }>();
+  for (const g of globalInstalls) {
+    if (project.marketplace_disabled.some((d) => sameItem(d, g))) continue;
+    byKey.set(itemRefKey(g), { ...g, source: "global" });
+  }
+  for (const p of project.marketplace_installs) {
+    byKey.set(itemRefKey(p), { ...p, source: "project" });
+  }
+  return [...byKey.entries()]
+    .sort(([a], [b]) => (a < b ? -1 : a > b ? 1 : 0))
+    .map(([, v]) => v);
+}
+
+export function isStale(snapshot: MarketplaceSnapshot, now: number): boolean {
+  if (!snapshot.fetched_at) return true;
+  const at = Date.parse(snapshot.fetched_at);
+  if (Number.isNaN(at)) return true;
+  return now - at > STALE_AFTER_MS;
+}

app/src/lib/tauri-commands.ts

@@ -1,5 +1,5 @@
 import { invoke } from "@tauri-apps/api/core";
-import type { Project, ProjectPath, ProjectRemovalReport, ProjectResetOutcome, ContainerInfo, AppSettings, SettingsImportPreview, SettingsImportOutcome, UpdateInfo, ImageUpdateInfo, FileEntry, FileContents, WebTerminalInfo, SttStatus, GatewayStatus, InstallOptions, ClaudeSession, ContainerCapabilities, ScheduledTask, ScheduledTaskInput, SchedulerNotification, AuthBridgeStatus, BrowserViewStatus, BrowserViewPopoutState, BrowserPageState, PlaywrightDetection, BrowserSetupOutcome, BrowserInstallTarget, ContainerStaleness, MigrationOptions, MigrationReport, MigrationState, ClearTokenOutcome, CaCertInfo, UploadOutcome, Note, ViewerFile, ViewerPoll, ViewerSaved, ViewerState } from "./types";
+import type { Project, ProjectPath, ProjectRemovalReport, ProjectResetOutcome, ContainerInfo, AppSettings, SettingsImportPreview, SettingsImportOutcome, UpdateInfo, ImageUpdateInfo, FileEntry, FileContents, WebTerminalInfo, SttStatus, GatewayStatus, InstallOptions, ClaudeSession, ContainerCapabilities, ScheduledTask, ScheduledTaskInput, SchedulerNotification, AuthBridgeStatus, BrowserViewStatus, BrowserViewPopoutState, BrowserPageState, PlaywrightDetection, BrowserSetupOutcome, BrowserInstallTarget, ContainerStaleness, MigrationOptions, MigrationReport, MigrationState, ClearTokenOutcome, CaCertInfo, UploadOutcome, Note, ViewerFile, ViewerPoll, ViewerSaved, ViewerState, FileDiff, InstallScope, ItemUpdate, Marketplace, MarketplaceAccount, MarketplaceItemRef, MarketplaceSnapshot, ProjectSyncResult, SyncReport } from "./types";
 
 // Docker
 export const checkDocker = () => invoke<boolean>("check_docker");
@@ -432,3 +432,55 @@ export const viewerWriteFile = (contentsBase64: string, baseHash: string) =>
   invoke<ViewerSaved>("viewer_write_file", { contentsBase64, baseHash });
 export const viewerChooseFile = (index: number) =>
   invoke<ViewerState>("viewer_choose_file", { index });
+
+// ---- Marketplace ----
+
+export const listMarketplaceSnapshots = () =>
+  invoke<MarketplaceSnapshot[]>("list_marketplace_snapshots");
+export const refreshMarketplaces = (marketplaceId?: string) =>
+  invoke<MarketplaceSnapshot[]>("refresh_marketplaces", { marketplaceId: marketplaceId ?? null });
+export const addMarketplace = (
+  name: string,
+  url: string,
+  branch: string | null,
+  accountId: string | null,
+) => invoke<MarketplaceSnapshot>("add_marketplace", { name, url, branch, accountId });
+export const updateMarketplace = (marketplace: Marketplace) =>
+  invoke<AppSettings>("update_marketplace", { marketplace });
+export const removeMarketplace = (marketplaceId: string) =>
+  invoke<AppSettings>("remove_marketplace", { marketplaceId });
+export const installMarketplaceItem = (item: MarketplaceItemRef, scope: InstallScope) =>
+  invoke<AppSettings>("install_marketplace_item", { item, scope });
+export const uninstallMarketplaceItem = (item: MarketplaceItemRef, scope: InstallScope) =>
+  invoke<void>("uninstall_marketplace_item", { item, scope });
+export const setGlobalItemDisabled = (
+  projectId: string,
+  item: MarketplaceItemRef,
+  disabled: boolean,
+) => invoke<Project>("set_global_item_disabled", { projectId, item, disabled });
+export const forgetMarketplaceInstalls = (marketplaceId: string) =>
+  invoke<void>("forget_marketplace_installs", { marketplaceId });
+export const listMarketplaceUpdates = () => invoke<ItemUpdate[]>("list_marketplace_updates");
+export const marketplaceItemDiff = (
+  item: MarketplaceItemRef,
+  fromCommit: string,
+  toCommit: string,
+) => invoke<FileDiff[]>("marketplace_item_diff", { item, fromCommit, toCommit });
+export const updateMarketplaceItem = (item: MarketplaceItemRef, scope: InstallScope) =>
+  invoke<void>("update_marketplace_item", { item, scope });
+export const applyMarketplaceNow = (projectId?: string) =>
+  invoke<ProjectSyncResult[]>("apply_marketplace_now", { projectId: projectId ?? null });
+export const getMarketplaceSyncReport = (projectId: string) =>
+  invoke<SyncReport | null>("get_marketplace_sync_report", { projectId });
+export const addMarketplaceTokenAccount = (label: string, host: string, token: string) =>
+  invoke<MarketplaceAccount>("add_marketplace_token_account", { label, host, token });
+export const addMarketplaceGhHostAccount = (label: string, host: string) =>
+  invoke<MarketplaceAccount>("add_marketplace_gh_host_account", { label, host });
+export const startMarketplaceGhContainerLogin = (label: string, host: string, projectId: string) =>
+  invoke<MarketplaceAccount>("start_marketplace_gh_container_login", { label, host, projectId });
+export const cancelMarketplaceGhLogin = () => invoke<void>("cancel_marketplace_gh_login");
+export const testMarketplaceAccount = (accountId: string) =>
+  invoke<string>("test_marketplace_account", { accountId });
+export const removeMarketplaceAccount = (accountId: string) =>
+  invoke<AppSettings>("remove_marketplace_account", { accountId });
+export const marketplaceGhHostAvailable = () => invoke<boolean>("marketplace_gh_host_available");

app/src/store/appState.test.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect, beforeEach } from "vitest";
-import { useAppState, homeTabKey, terminalTabKey } from "./appState";
+import { useAppState, homeTabKey, terminalTabKey, MARKETPLACE_TAB_KEY } from "./appState";
 
 const A = homeTabKey("a");
 const B = terminalTabKey("b");
@@ -136,3 +136,45 @@ describe("terminal focus requests", () => {
     expect(pending()).toBe("s1");
   });
 });
+
+describe("marketplace tab", () => {
+  beforeEach(() => {
+    seed([A, B], A);
+    useAppState.setState({ marketplaceFilterProjectId: null });
+  });
+
+  it("opens once, activates, and records the project filter", () => {
+    useAppState.getState().openMarketplace("p9");
+    useAppState.getState().openMarketplace("p9");
+    const s = useAppState.getState();
+    expect(s.tabOrder).toEqual([A, B, MARKETPLACE_TAB_KEY]);
+    expect(s.activeTabKey).toBe(MARKETPLACE_TAB_KEY);
+    expect(s.activeSessionId).toBeNull();
+    expect(s.marketplaceFilterProjectId).toBe("p9");
+  });
+
+  it("clears the filter when opened without a project", () => {
+    useAppState.getState().openMarketplace("p9");
+    useAppState.getState().openMarketplace();
+    expect(useAppState.getState().marketplaceFilterProjectId).toBeNull();
+  });
+
+  it("does not select a project when activated", () => {
+    useAppState.getState().openMarketplace();
+    useAppState.getState().setActiveTabKey(MARKETPLACE_TAB_KEY);
+    expect(useAppState.getState().selectedProjectId).toBeNull();
+  });
+
+  it("closes and activates the neighbour", () => {
+    useAppState.getState().openMarketplace();
+    useAppState.getState().closeMarketplaceTab();
+    const s = useAppState.getState();
+    expect(s.tabOrder).toEqual([A, B]);
+    expect(s.activeTabKey).toBe(B);
+  });
+
+  it("closing when not open is a no-op", () => {
+    useAppState.getState().closeMarketplaceTab();
+    expect(useAppState.getState().tabOrder).toEqual([A, B]);
+  });
+});

app/src/store/appState.ts

@@ -85,6 +85,10 @@ export const isTerminalTab = (key: string) => key.startsWith("term:");
 export const isHomeTab = (key: string) => key.startsWith("home:");
 export const tabKeyId = (key: string) => key.slice(key.indexOf(":") + 1);
 
+/** The Marketplace view is a singleton main-area tab; its key has no id part. */
+export const MARKETPLACE_TAB_KEY = "marketplace";
+export const isMarketplaceTab = (key: string) => key === MARKETPLACE_TAB_KEY;
+
 /** activeSessionId is derived from the active tab so exactly one thing is "current". */
 function activation(activeTabKey: string | null) {
   return {
@@ -160,6 +164,12 @@ interface AppState {
   requestTerminalFocus: (sessionId: string) => void;
   clearPendingTerminalFocus: () => void;
   closeHomeTab: (projectId: string) => void;
+  /** Project the Marketplace view is filtered to, or null for all projects. */
+  marketplaceFilterProjectId: string | null;
+  setMarketplaceFilterProjectId: (projectId: string | null) => void;
+  /** Open (or focus) the singleton Marketplace tab, optionally filtered to one project. */
+  openMarketplace: (filterProjectId?: string | null) => void;
+  closeMarketplaceTab: () => void;
   setActiveTabKey: (key: string) => void;
   cycleTab: (delta: number) => void;
   focusTabIndex: (index: number) => void;
@@ -386,6 +396,27 @@ export const useAppState = create<AppState>((set) => ({
           : state.activeTabKey;
       return { tabOrder, ...activation(activeTabKey) };
     }),
+  marketplaceFilterProjectId: null,
+  setMarketplaceFilterProjectId: (projectId) => set({ marketplaceFilterProjectId: projectId }),
+  openMarketplace: (filterProjectId = null) =>
+    set((state) => ({
+      marketplaceFilterProjectId: filterProjectId,
+      tabOrder: state.tabOrder.includes(MARKETPLACE_TAB_KEY)
+        ? state.tabOrder
+        : [...state.tabOrder, MARKETPLACE_TAB_KEY],
+      ...activation(MARKETPLACE_TAB_KEY),
+    })),
+  closeMarketplaceTab: () =>
+    set((state) => {
+      const index = state.tabOrder.indexOf(MARKETPLACE_TAB_KEY);
+      if (index === -1) return {};
+      const tabOrder = state.tabOrder.filter((k) => k !== MARKETPLACE_TAB_KEY);
+      const activeTabKey =
+        state.activeTabKey === MARKETPLACE_TAB_KEY
+          ? (tabOrder[Math.min(index, tabOrder.length - 1)] ?? null)
+          : state.activeTabKey;
+      return { tabOrder, ...activation(activeTabKey) };
+    }),
   setActiveTabKey: (key) =>
     set((state) => {
       if (!state.tabOrder.includes(key)) return {};