diff --git a/app/src/components/marketplace/AccountsPane.test.tsx b/app/src/components/marketplace/AccountsPane.test.tsx
new file mode 100644
index 0000000..5c5b3bb
--- /dev/null
+++ b/app/src/components/marketplace/AccountsPane.test.tsx
@@ -0,0 +1,75 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { useAppState } from "../../store/appState";
+import type { AppSettings } from "../../lib/types";
+import type { MarketplaceApi } from "../../hooks/useMarketplace";
+
+const testMarketplaceAccount = vi.fn();
+const removeMarketplaceAccount = vi.fn();
+vi.mock("../../lib/tauri-commands", () => ({
+  testMarketplaceAccount: (id: string) => testMarketplaceAccount(id),
+  removeMarketplaceAccount: (id: string) => removeMarketplaceAccount(id),
+}));
+vi.mock("./AddAccountModal", () => ({ default: () => <div>add account modal</div> }));
+
+import AccountsPane from "./AccountsPane";
+
+const settings = {
+  marketplace_accounts: [
+    { id: "a1", label: "Personal", host: "github.com", method: "gh_host", username: "me" },
+    { id: "a2", label: "Gitea", host: "repo.example.com", method: "token", username: "jk" },
+  ],
+  marketplaces: [{ id: "m1", name: "Team", url: "https://repo.example.com/t/m.git", branch: null, account_id: "a2" }],
+  global_marketplace_installs: [],
+} as unknown as AppSettings;
+
+describe("AccountsPane", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    useAppState.setState({ appSettings: settings, toasts: [] });
+  });
+
+  it("lists accounts with their method and usage", () => {
+    render(<AccountsPane mp={{} as MarketplaceApi} />);
+    expect(screen.getByText("Personal")).toBeInTheDocument();
+    expect(screen.getByText(/gh on this computer/)).toBeInTheDocument();
+    expect(screen.getByText(/Used by Team$/)).toBeInTheDocument();
+  });
+
+  it("tests an account", async () => {
+    testMarketplaceAccount.mockResolvedValue("me");
+    render(<AccountsPane mp={{} as MarketplaceApi} />);
+    fireEvent.click(screen.getByRole("button", { name: "Test Personal" }));
+    await waitFor(() => expect(useAppState.getState().toasts[0]).toMatchObject({ kind: "success" }));
+    expect(useAppState.getState().toasts[0].message).toContain("me");
+  });
+
+  // F5: the backend refuses to remove an account a marketplace uses, so the
+  // UI must not promise otherwise with a confirm modal — Remove is disabled
+  // with a hint instead, and there is no confirm step to click through.
+  it("disables Remove for an account in use, with a hint", () => {
+    render(<AccountsPane mp={{} as MarketplaceApi} />);
+    const removeGitea = screen.getByRole("button", { name: "Remove Gitea" });
+    expect(removeGitea).toHaveAttribute("aria-disabled", "true");
+    expect(screen.getByText(/Used by Team.*change or remove that marketplace first/)).toBeInTheDocument();
+    fireEvent.click(removeGitea);
+    expect(removeMarketplaceAccount).not.toHaveBeenCalled();
+    expect(screen.queryByRole("dialog")).not.toBeInTheDocument();
+  });
+
+  it("removes an unused account", async () => {
+    removeMarketplaceAccount.mockResolvedValue({ ...settings, marketplace_accounts: [settings.marketplace_accounts[1]] });
+    render(<AccountsPane mp={{} as MarketplaceApi} />);
+    const removePersonal = screen.getByRole("button", { name: "Remove Personal" });
+    expect(removePersonal).not.toHaveAttribute("aria-disabled");
+    fireEvent.click(removePersonal);
+    await waitFor(() => expect(removeMarketplaceAccount).toHaveBeenCalledWith("a1"));
+    await waitFor(() => expect(useAppState.getState().appSettings!.marketplace_accounts).toHaveLength(1));
+  });
+
+  it("opens the add dialog", () => {
+    render(<AccountsPane mp={{} as MarketplaceApi} />);
+    fireEvent.click(screen.getByRole("button", { name: "Add account" }));
+    expect(screen.getByText("add account modal")).toBeInTheDocument();
+  });
+});
diff --git a/app/src/components/marketplace/AccountsPane.tsx b/app/src/components/marketplace/AccountsPane.tsx
index 41fcb1c..6f28255 100644
--- a/app/src/components/marketplace/AccountsPane.tsx
+++ b/app/src/components/marketplace/AccountsPane.tsx
@@ -1,11 +1,108 @@
+import { useState } from "react";
 import type { MarketplaceApi } from "../../hooks/useMarketplace";
 import { useAppState } from "../../store/appState";
+import { removeMarketplaceAccount, testMarketplaceAccount } from "../../lib/tauri-commands";
+import type { AccountMethod, MarketplaceAccount } from "../../lib/types";
+import Button from "../ui/Button";
+import AddAccountModal from "./AddAccountModal";
+
+const METHOD_LABEL: Record<AccountMethod, string> = {
+  gh_host: "GitHub — gh on this computer",
+  gh_container: "GitHub — signed in via container",
+  token: "Access token",
+};
 
 export default function AccountsPane(_props: { mp: MarketplaceApi }) {
-  const count = useAppState((s) => s.appSettings?.marketplace_accounts.length ?? 0);
+  const appSettings = useAppState((s) => s.appSettings);
+  const setAppSettings = useAppState((s) => s.setAppSettings);
+  const pushToast = useAppState((s) => s.pushToast);
+  const [adding, setAdding] = useState(false);
+  const [testing, setTesting] = useState<string | null>(null);
+  const [removing, setRemoving] = useState<string | null>(null);
+
+  const accounts = appSettings?.marketplace_accounts ?? [];
+  const marketplaces = appSettings?.marketplaces ?? [];
+  const usedBy = (id: string) => marketplaces.filter((m) => m.account_id === id).map((m) => m.name);
+
+  const test = async (a: MarketplaceAccount) => {
+    setTesting(a.id);
+    try {
+      const login = await testMarketplaceAccount(a.id);
+      pushToast({ kind: "success", message: `${a.label} works — signed in as ${login}` });
+    } catch (e) {
+      pushToast({ kind: "error", message: `${a.label} could not sign in`, detail: String(e) });
+    } finally {
+      setTesting(null);
+    }
+  };
+
+  const remove = async (a: MarketplaceAccount) => {
+    setRemoving(a.id);
+    try {
+      setAppSettings(await removeMarketplaceAccount(a.id));
+    } catch (e) {
+      pushToast({ kind: "error", message: `Could not remove ${a.label}`, detail: String(e) });
+    } finally {
+      setRemoving(null);
+    }
+  };
+
   return (
-    <p className="p-4 text-xs text-[var(--text-secondary)]">
-      {count} account{count === 1 ? "" : "s"}.
-    </p>
+    <div className="p-4 space-y-3 max-w-3xl">
+      <div className="flex items-center justify-between">
+        <p className="text-xs text-[var(--text-secondary)]">
+          Accounts are used to fetch private marketplaces. Tokens are kept in your OS keychain and never enter
+          containers.
+        </p>
+        <Button size="md" variant="secondary" onClick={() => setAdding(true)}>
+          Add account
+        </Button>
+      </div>
+      {accounts.length === 0 && <p className="text-xs text-[var(--text-secondary)]">No accounts yet. Public repositories need none.</p>}
+      <ul className="space-y-2">
+        {accounts.map((a) => {
+          const users = usedBy(a.id);
+          const inUse = users.length > 0;
+          return (
+            <li
+              key={a.id}
+              className="flex items-center justify-between gap-2 p-2 rounded-[var(--radius-control)] border border-[var(--border-color)]"
+            >
+              <div className="min-w-0 text-xs">
+                <p className="font-medium">{a.label}</p>
+                <p className="text-[var(--text-secondary)]">
+                  {METHOD_LABEL[a.method]} · {a.host}
+                  {a.username ? ` · ${a.username}` : ""}
+                </p>
+                {inUse && <p className="text-[var(--text-secondary)]">Used by {users.join(", ")}</p>}
+              </div>
+              <div className="flex gap-1 flex-shrink-0">
+                <Button
+                  size="sm"
+                  variant="ghost"
+                  aria-label={`Test ${a.label}`}
+                  disabled={testing === a.id}
+                  onClick={() => void test(a)}
+                >
+                  {testing === a.id ? "Testing…" : "Test"}
+                </Button>
+                <Button
+                  size="sm"
+                  variant="ghost"
+                  aria-label={`Remove ${a.label}`}
+                  disabled={removing === a.id}
+                  unavailable={inUse}
+                  unavailableReason={`Used by ${users.join(", ")} — change or remove that marketplace first`}
+                  onClick={() => void remove(a)}
+                >
+                  Remove
+                </Button>
+              </div>
+            </li>
+          );
+        })}
+      </ul>
+      {adding && <AddAccountModal onClose={() => setAdding(false)} />}
+    </div>
   );
 }
diff --git a/app/src/components/marketplace/AddAccountModal.test.tsx b/app/src/components/marketplace/AddAccountModal.test.tsx
new file mode 100644
index 0000000..a00e4a0
--- /dev/null
+++ b/app/src/components/marketplace/AddAccountModal.test.tsx
@@ -0,0 +1,77 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { useAppState } from "../../store/appState";
+import type { Project } from "../../lib/types";
+
+const marketplaceGhHostAvailable = vi.fn();
+const addMarketplaceGhHostAccount = vi.fn();
+const addMarketplaceTokenAccount = vi.fn();
+const getSettings = vi.fn();
+vi.mock("../../lib/tauri-commands", () => ({
+  marketplaceGhHostAvailable: () => marketplaceGhHostAvailable(),
+  addMarketplaceGhHostAccount: (...a: unknown[]) => addMarketplaceGhHostAccount(...a),
+  addMarketplaceTokenAccount: (...a: unknown[]) => addMarketplaceTokenAccount(...a),
+  getSettings: () => getSettings(),
+}));
+vi.mock("./GhContainerLoginModal", () => ({
+  default: ({ projectId }: { projectId: string }) => <div>container login for {projectId}</div>,
+}));
+
+import AddAccountModal from "./AddAccountModal";
+
+const running = { id: "p1", name: "api", status: "running", container_id: "c1" } as unknown as Project;
+
+describe("AddAccountModal", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    getSettings.mockResolvedValue({ marketplace_accounts: [] });
+    useAppState.setState({ projects: [running], toasts: [] });
+  });
+
+  it("uses host gh when available", async () => {
+    marketplaceGhHostAvailable.mockResolvedValue(true);
+    addMarketplaceGhHostAccount.mockResolvedValue({ id: "a1" });
+    const onClose = vi.fn();
+    render(<AddAccountModal onClose={onClose} />);
+    expect(await screen.findByText(/gh is installed on this computer/)).toBeInTheDocument();
+    fireEvent.change(screen.getByLabelText("Label"), { target: { value: "Personal" } });
+    fireEvent.click(screen.getByRole("button", { name: "Add account" }));
+    await waitFor(() => expect(addMarketplaceGhHostAccount).toHaveBeenCalledWith("Personal", "github.com"));
+    await waitFor(() => expect(onClose).toHaveBeenCalled());
+  });
+
+  it("falls back to gh in a running container", async () => {
+    marketplaceGhHostAvailable.mockResolvedValue(false);
+    render(<AddAccountModal onClose={vi.fn()} />);
+    expect(await screen.findByLabelText("Run gh in")).toBeInTheDocument();
+    fireEvent.change(screen.getByLabelText("Label"), { target: { value: "Work" } });
+    fireEvent.click(screen.getByRole("button", { name: "Sign in" }));
+    expect(screen.getByText("container login for p1")).toBeInTheDocument();
+  });
+
+  it("adds a token account for any host", async () => {
+    marketplaceGhHostAvailable.mockResolvedValue(false);
+    addMarketplaceTokenAccount.mockResolvedValue({ id: "a2" });
+    render(<AddAccountModal onClose={vi.fn()} />);
+    fireEvent.click(await screen.findByRole("radio", { name: "Access token" }));
+    fireEvent.change(screen.getByLabelText("Label"), { target: { value: "Gitea" } });
+    fireEvent.change(screen.getByLabelText("Host"), { target: { value: "repo.anhonesthost.net" } });
+    fireEvent.change(screen.getByLabelText("Token"), { target: { value: "test-token-not-real" } });
+    fireEvent.click(screen.getByRole("button", { name: "Add account" }));
+    await waitFor(() =>
+      expect(addMarketplaceTokenAccount).toHaveBeenCalledWith("Gitea", "repo.anhonesthost.net", "test-token-not-real"),
+    );
+  });
+
+  it("shows a validation error from the backend", async () => {
+    marketplaceGhHostAvailable.mockResolvedValue(false);
+    addMarketplaceTokenAccount.mockRejectedValue("The token was rejected by repo.anhonesthost.net (HTTP 401)");
+    render(<AddAccountModal onClose={vi.fn()} />);
+    fireEvent.click(await screen.findByRole("radio", { name: "Access token" }));
+    fireEvent.change(screen.getByLabelText("Label"), { target: { value: "G" } });
+    fireEvent.change(screen.getByLabelText("Host"), { target: { value: "repo.anhonesthost.net" } });
+    fireEvent.change(screen.getByLabelText("Token"), { target: { value: "test-token-not-real" } });
+    fireEvent.click(screen.getByRole("button", { name: "Add account" }));
+    expect(await screen.findByText(/HTTP 401/)).toBeInTheDocument();
+  });
+});
diff --git a/app/src/components/marketplace/AddAccountModal.tsx b/app/src/components/marketplace/AddAccountModal.tsx
new file mode 100644
index 0000000..efcf76e
--- /dev/null
+++ b/app/src/components/marketplace/AddAccountModal.tsx
@@ -0,0 +1,190 @@
+import { useEffect, useState } from "react";
+import Modal from "../ui/Modal";
+import Button from "../ui/Button";
+import SegmentedControl from "../ui/SegmentedControl";
+import Field, { inputClass, selectClass } from "../ui/Field";
+import {
+  addMarketplaceGhHostAccount,
+  addMarketplaceTokenAccount,
+  getSettings,
+  marketplaceGhHostAvailable,
+} from "../../lib/tauri-commands";
+import { useAppState } from "../../store/appState";
+import GhContainerLoginModal from "./GhContainerLoginModal";
+
+type Method = "gh" | "token";
+
+interface Props {
+  onClose: () => void;
+}
+
+export default function AddAccountModal({ onClose }: Props) {
+  const projects = useAppState((s) => s.projects);
+  const setAppSettings = useAppState((s) => s.setAppSettings);
+  const runnable = projects.filter((p) => p.status === "running" && p.container_id);
+
+  const [method, setMethod] = useState<Method>("gh");
+  const [hostGh, setHostGh] = useState<boolean | null>(null);
+  const [label, setLabel] = useState("");
+  const [host, setHost] = useState("github.com");
+  const [token, setToken] = useState("");
+  const [projectId, setProjectId] = useState(runnable[0]?.id ?? "");
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [containerLogin, setContainerLogin] = useState(false);
+
+  useEffect(() => {
+    let cancelled = false;
+    marketplaceGhHostAvailable()
+      .then((v) => {
+        if (!cancelled) setHostGh(v);
+      })
+      .catch(() => {
+        if (!cancelled) setHostGh(false);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, []);
+
+  const reloadSettings = async () => setAppSettings(await getSettings());
+
+  const finish = async () => {
+    await reloadSettings();
+    onClose();
+  };
+
+  const submit = async () => {
+    setError(null);
+    if (method === "gh" && !hostGh) {
+      setContainerLogin(true);
+      return;
+    }
+    setBusy(true);
+    try {
+      if (method === "gh") {
+        await addMarketplaceGhHostAccount(label.trim(), host.trim());
+      } else {
+        const t = token.trim();
+        setToken("");
+        await addMarketplaceTokenAccount(label.trim(), host.trim(), t);
+      }
+      await finish();
+    } catch (e) {
+      setError(typeof e === "string" ? e : String(e));
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  const hostValid = /^[A-Za-z0-9.-]+(:[0-9]+)?$/.test(host.trim());
+  const needsContainer = method === "gh" && hostGh === false;
+  const canSubmit =
+    !busy &&
+    hostGh !== null &&
+    label.trim() !== "" &&
+    hostValid &&
+    (method === "gh" ? !needsContainer || projectId !== "" : token.trim() !== "");
+
+  if (containerLogin) {
+    const project = runnable.find((p) => p.id === projectId);
+    return (
+      <GhContainerLoginModal
+        label={label.trim()}
+        host={host.trim()}
+        projectId={projectId}
+        projectName={project?.name ?? projectId}
+        onClose={onClose}
+        onDone={() => void finish()}
+      />
+    );
+  }
+
+  return (
+    <Modal
+      title="Add account"
+      description="Accounts let Triple-C read private marketplace repositories. Credentials stay on this computer and never enter containers."
+      widthClassName="w-[36rem]"
+      dismissible={!busy}
+      onClose={onClose}
+      footer={
+        <>
+          <Button size="md" variant="ghost" onClick={onClose} disabled={busy}>
+            Cancel
+          </Button>
+          <Button size="md" variant="primary" onClick={() => void submit()} disabled={!canSubmit}>
+            {needsContainer ? "Sign in" : busy ? "Checking…" : "Add account"}
+          </Button>
+        </>
+      }
+    >
+      <div className="space-y-3">
+        <SegmentedControl<Method>
+          label="Sign-in method"
+          value={method}
+          onChange={(m) => {
+            setMethod(m);
+            setError(null);
+          }}
+          segments={[
+            { value: "gh", label: "GitHub via gh" },
+            { value: "token", label: "Access token" },
+          ]}
+        />
+        <Field label="Label">
+          {(id) => (
+            <input id={id} value={label} onChange={(e) => setLabel(e.target.value)} className={inputClass} placeholder="Work GitHub" />
+          )}
+        </Field>
+        <Field label="Host" hint={hostValid ? undefined : "Host name only, e.g. github.com or repo.example.com"}>
+          {(id) => <input id={id} value={host} onChange={(e) => setHost(e.target.value)} className={inputClass} />}
+        </Field>
+        {method === "gh" && hostGh === true && (
+          <p className="text-xs text-[var(--text-secondary)]">
+            gh is installed on this computer. Triple-C asks it for a token each time it fetches, so signing out of gh
+            also signs this account out. If gh is not logged in yet, run <code className="font-mono">gh auth login</code> first.
+          </p>
+        )}
+        {needsContainer &&
+          (runnable.length === 0 ? (
+            <p className="text-xs text-[var(--warning)]">
+              gh is not installed on this computer. Start a project so gh can run in its container, or use an access token.
+            </p>
+          ) : (
+            <Field
+              label="Run gh in"
+              hint="gh is not installed on this computer, so the sign-in runs in this container. The token is kept in your OS keychain, not in the container."
+            >
+              {(id) => (
+                <select id={id} value={projectId} onChange={(e) => setProjectId(e.target.value)} className={selectClass}>
+                  {runnable.map((p) => (
+                    <option key={p.id} value={p.id}>
+                      {p.name}
+                    </option>
+                  ))}
+                </select>
+              )}
+            </Field>
+          ))}
+        {method === "token" && (
+          <Field
+            label="Token"
+            hint="A personal access token with read access to the repository. For GitHub SSO orgs, authorise the token for the org."
+          >
+            {(id) => (
+              <input
+                id={id}
+                type="password"
+                autoComplete="off"
+                value={token}
+                onChange={(e) => setToken(e.target.value)}
+                className={inputClass}
+              />
+            )}
+          </Field>
+        )}
+        {error && <p role="alert" className="text-xs text-[var(--error)] whitespace-pre-wrap">{error}</p>}
+      </div>
+    </Modal>
+  );
+}
diff --git a/app/src/components/marketplace/GhContainerLoginModal.test.tsx b/app/src/components/marketplace/GhContainerLoginModal.test.tsx
new file mode 100644
index 0000000..80cc00f
--- /dev/null
+++ b/app/src/components/marketplace/GhContainerLoginModal.test.tsx
@@ -0,0 +1,72 @@
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { act, fireEvent, render, screen, waitFor } from "@testing-library/react";
+
+const startMarketplaceGhContainerLogin = vi.fn();
+const cancelMarketplaceGhLogin = vi.fn();
+const openUrlExternal = vi.fn();
+vi.mock("../../lib/tauri-commands", () => ({
+  startMarketplaceGhContainerLogin: (...a: unknown[]) => startMarketplaceGhContainerLogin(...a),
+  cancelMarketplaceGhLogin: () => cancelMarketplaceGhLogin(),
+  openUrlExternal: (u: string) => openUrlExternal(u),
+}));
+
+const handlers = new Map<string, (e: { payload: unknown }) => void>();
+vi.mock("@tauri-apps/api/event", () => ({
+  listen: vi.fn(async (name: string, cb: (e: { payload: unknown }) => void) => {
+    handlers.set(name, cb);
+    return vi.fn();
+  }),
+}));
+
+import GhContainerLoginModal from "./GhContainerLoginModal";
+
+describe("GhContainerLoginModal", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    handlers.clear();
+  });
+
+  it("shows the device code, opens the URL, and finishes", async () => {
+    let resolve!: (v: unknown) => void;
+    startMarketplaceGhContainerLogin.mockReturnValue(new Promise((r) => (resolve = r)));
+    const onDone = vi.fn();
+    render(
+      <GhContainerLoginModal label="Work" host="github.com" projectId="p1" projectName="api" onClose={vi.fn()} onDone={onDone} />,
+    );
+    await waitFor(() => expect(handlers.has("marketplace-gh-login-code")).toBe(true));
+    await waitFor(() => expect(startMarketplaceGhContainerLogin).toHaveBeenCalledWith("Work", "github.com", "p1"));
+
+    act(() =>
+      handlers.get("marketplace-gh-login-code")!({
+        payload: { account_id: "unknown-yet", code: "ABCD-1234", url: "https://github.com/login/device" },
+      }),
+    );
+    expect(screen.getByText("ABCD-1234")).toBeInTheDocument();
+    fireEvent.click(screen.getByRole("button", { name: "Open GitHub" }));
+    expect(openUrlExternal).toHaveBeenCalledWith("https://github.com/login/device");
+
+    await act(async () => resolve({ id: "acc9", label: "Work", host: "github.com", method: "gh_container", username: "me" }));
+    await waitFor(() => expect(onDone).toHaveBeenCalled());
+  });
+
+  it("refuses to open a non-GitHub URL from the container", async () => {
+    startMarketplaceGhContainerLogin.mockReturnValue(new Promise(() => {}));
+    render(<GhContainerLoginModal label="W" host="github.com" projectId="p1" projectName="api" onClose={vi.fn()} onDone={vi.fn()} />);
+    await waitFor(() => expect(handlers.has("marketplace-gh-login-code")).toBe(true));
+    act(() =>
+      handlers.get("marketplace-gh-login-code")!({
+        payload: { account_id: "x", code: "ABCD-1234", url: "https://evil.example/login" },
+      }),
+    );
+    expect(screen.queryByRole("button", { name: "Open GitHub" })).not.toBeInTheDocument();
+  });
+
+  it("cancels", async () => {
+    startMarketplaceGhContainerLogin.mockReturnValue(new Promise(() => {}));
+    const onClose = vi.fn();
+    render(<GhContainerLoginModal label="W" host="github.com" projectId="p1" projectName="api" onClose={onClose} onDone={vi.fn()} />);
+    fireEvent.click(await screen.findByRole("button", { name: "Cancel sign-in" }));
+    expect(cancelMarketplaceGhLogin).toHaveBeenCalled();
+    expect(onClose).toHaveBeenCalled();
+  });
+});
diff --git a/app/src/components/marketplace/GhContainerLoginModal.tsx b/app/src/components/marketplace/GhContainerLoginModal.tsx
new file mode 100644
index 0000000..33f9bad
--- /dev/null
+++ b/app/src/components/marketplace/GhContainerLoginModal.tsx
@@ -0,0 +1,158 @@
+import { useEffect, useRef, useState } from "react";
+import { listen, type UnlistenFn } from "@tauri-apps/api/event";
+import Modal from "../ui/Modal";
+import Button from "../ui/Button";
+import StatusIndicator from "../ui/StatusIndicator";
+import {
+  cancelMarketplaceGhLogin,
+  openUrlExternal,
+  startMarketplaceGhContainerLogin,
+} from "../../lib/tauri-commands";
+import type { MarketplaceAccount } from "../../lib/types";
+
+interface Props {
+  label: string;
+  host: string;
+  projectId: string;
+  projectName: string;
+  onClose: () => void;
+  onDone: (account: MarketplaceAccount) => void;
+}
+
+interface CodeEvent {
+  account_id: string;
+  code: string;
+  url: string;
+}
+interface OutputEvent {
+  account_id: string;
+  chunk: string;
+}
+
+const MAX_OUTPUT = 8000;
+
+/** Only open device-login pages on the host being signed in to. */
+function safeDeviceUrl(url: string, host: string): string | null {
+  try {
+    const u = new URL(url);
+    return u.protocol === "https:" && u.hostname === host ? u.toString() : null;
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Drives `gh auth login --web` inside a running container. The command only
+ * resolves when the login finishes, so the new account's id is unknown while it
+ * runs; the modal accepts every gh-login event while open. The backend allows
+ * one gh login at a time, so there is never another flow's event to confuse.
+ */
+export default function GhContainerLoginModal({ label, host, projectId, projectName, onClose, onDone }: Props) {
+  const [code, setCode] = useState<string | null>(null);
+  const [url, setUrl] = useState<string | null>(null);
+  const [output, setOutput] = useState("");
+  const [error, setError] = useState<string | null>(null);
+  const [running, setRunning] = useState(true);
+  const started = useRef(false);
+
+  useEffect(() => {
+    let cancelled = false;
+    const unlisteners: UnlistenFn[] = [];
+    const register = async <T,>(name: string, handle: (p: T) => void) => {
+      const un = await listen<T>(name, (e) => handle(e.payload));
+      if (cancelled) un();
+      else unlisteners.push(un);
+    };
+
+    void (async () => {
+      await register<CodeEvent>("marketplace-gh-login-code", (p) => {
+        setCode(p.code);
+        setUrl(p.url);
+      });
+      await register<OutputEvent>("marketplace-gh-login-output", (p) =>
+        setOutput((prev) => {
+          const next = prev + p.chunk;
+          return next.length > MAX_OUTPUT ? next.slice(next.length - MAX_OUTPUT) : next;
+        }),
+      );
+      if (cancelled || started.current) return;
+      started.current = true;
+      try {
+        const account = await startMarketplaceGhContainerLogin(label, host, projectId);
+        if (!cancelled) {
+          setRunning(false);
+          onDone(account);
+        }
+      } catch (e) {
+        if (!cancelled) {
+          setRunning(false);
+          setError(typeof e === "string" ? e : String(e));
+        }
+      }
+    })();
+
+    return () => {
+      cancelled = true;
+      for (const un of unlisteners) {
+        try {
+          un();
+        } catch {
+          /* already gone */
+        }
+      }
+    };
+    // Runs once per modal instance; the props do not change while it is open.
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
+  const cancel = () => {
+    void cancelMarketplaceGhLogin();
+    onClose();
+  };
+
+  const openable = url ? safeDeviceUrl(url, host) : null;
+
+  return (
+    <Modal
+      title={`Sign in to ${host} with gh`}
+      description={`Running gh auth login in "${projectName}". The sign-in is not kept in that container.`}
+      widthClassName="w-[40rem]"
+      dismissible={!running}
+      onClose={running ? cancel : onClose}
+      footer={
+        running ? (
+          <Button size="md" variant="ghost" onClick={cancel}>
+            Cancel sign-in
+          </Button>
+        ) : (
+          <Button size="md" onClick={onClose}>
+            Close
+          </Button>
+        )
+      }
+    >
+      <div className="space-y-3">
+        {running && !code && <StatusIndicator tone="busy" label="Starting gh…" className="text-xs" />}
+        {code && running && (
+          <div className="space-y-2">
+            <p className="text-xs">Enter this code on the GitHub device page:</p>
+            <p className="font-mono text-lg tracking-widest select-all">{code}</p>
+            {openable ? (
+              <Button size="md" variant="primary" onClick={() => void openUrlExternal(openable)}>
+                Open GitHub
+              </Button>
+            ) : (
+              url && <p className="text-xs text-[var(--error)]">The sign-in URL did not point at {host}; not opening it.</p>
+            )}
+          </div>
+        )}
+        {error && <p role="alert" className="text-xs text-[var(--error)] whitespace-pre-wrap">{error}</p>}
+        {output && (
+          <pre className="max-h-40 overflow-auto p-2 text-[11px] font-mono whitespace-pre-wrap rounded-[var(--radius-control)] bg-[var(--bg-primary)] border border-[var(--border-color)]">
+            {output}
+          </pre>
+        )}
+      </div>
+    </Modal>
+  );
+}