diff --git a/ui/src/components/monitoring/auth-monitor/index.tsx b/ui/src/components/monitoring/auth-monitor/index.tsx
index 04f05f5a..615410dd 100644
--- a/ui/src/components/monitoring/auth-monitor/index.tsx
+++ b/ui/src/components/monitoring/auth-monitor/index.tsx
@@ -22,6 +22,7 @@ import { useAuthMonitorData } from './hooks';
 import { LivePulse } from './components/live-pulse';
 import { ProviderCard } from './components/provider-card';
 import { SummaryCard } from './components/summary-card';
+import { getSuccessRate } from './utils';
 
 const STORAGE_KEY = 'auth-monitor-selected-provider';
 
@@ -78,6 +79,13 @@ export function AuthMonitor() {
   const selectedProviderData = effectiveProvider
     ? providerStats.find((ps) => ps.provider === effectiveProvider)
     : null;
+  const displayedAccountCount = selectedProviderData?.accountCount ?? accounts.length;
+  const displayedSuccess = selectedProviderData?.successCount ?? totalSuccess;
+  const displayedFailure = selectedProviderData?.failureCount ?? totalFailure;
+  const displayedTotalRequests = selectedProviderData?.totalRequests ?? totalRequests;
+  const displayedSuccessRate = selectedProviderData
+    ? getSuccessRate(selectedProviderData.successCount, selectedProviderData.failureCount)
+    : overallSuccessRate;
 
   const handlePauseToggle = (accountIds: string[], paused: boolean) => {
     if (
@@ -147,8 +155,8 @@ export function AuthMonitor() {
             <span>Updated {timeSinceUpdate || 'now'}</span>
           </div>
           <span className="text-muted-foreground/50">|</span>
-          <span>{t('authMonitor.accountsCount', { count: accounts.length })}</span>
-          <span className="font-mono">{totalRequests.toLocaleString()} req</span>
+          <span>{t('authMonitor.accountsCount', { count: displayedAccountCount })}</span>
+          <span className="font-mono">{displayedTotalRequests.toLocaleString()} req</span>
         </div>
       </div>
 
@@ -157,29 +165,29 @@ export function AuthMonitor() {
         <SummaryCard
           icon={<Activity className="w-4 h-4" />}
           label={t('authMonitor.accounts')}
-          value={accounts.length}
+          value={displayedAccountCount}
           color="var(--accent)"
         />
         <SummaryCard
           icon={<CheckCircle2 className="w-4 h-4" />}
           label={t('authMonitor.success')}
-          value={totalSuccess.toLocaleString()}
+          value={displayedSuccess.toLocaleString()}
           color={STATUS_COLORS.success}
         />
         <SummaryCard
           icon={<XCircle className="w-4 h-4" />}
           label={t('authMonitor.failed')}
-          value={totalFailure.toLocaleString()}
-          color={totalFailure > 0 ? STATUS_COLORS.failed : undefined}
+          value={displayedFailure.toLocaleString()}
+          color={displayedFailure > 0 ? STATUS_COLORS.failed : undefined}
         />
         <SummaryCard
           icon={<Activity className="w-4 h-4" />}
           label={t('authMonitor.successRate')}
-          value={`${overallSuccessRate}%`}
+          value={`${displayedSuccessRate}%`}
           color={
-            overallSuccessRate === 100
+            displayedSuccessRate === 100
               ? STATUS_COLORS.success
-              : overallSuccessRate >= 95
+              : displayedSuccessRate >= 95
                 ? STATUS_COLORS.degraded
                 : STATUS_COLORS.failed
           }
diff --git a/ui/tests/unit/ui/components/monitoring/auth-monitor/auth-monitor.test.tsx b/ui/tests/unit/ui/components/monitoring/auth-monitor/auth-monitor.test.tsx
new file mode 100644
index 00000000..c808338d
--- /dev/null
+++ b/ui/tests/unit/ui/components/monitoring/auth-monitor/auth-monitor.test.tsx
@@ -0,0 +1,183 @@
+import { render, screen, userEvent, within } from '@tests/setup/test-utils';
+import { beforeEach, describe, expect, it, vi } from 'vitest';
+import { AuthMonitor } from '@/components/monitoring/auth-monitor';
+import type { AuthMonitorData } from '@/components/monitoring/auth-monitor/hooks';
+
+vi.mock('@/components/account-flow-viz', () => ({
+  AccountFlowViz: ({
+    providerData,
+    onBack,
+  }: {
+    providerData: { displayName: string };
+    onBack: () => void;
+  }) => (
+    <div>
+      <button type="button" onClick={onBack}>
+        Back to providers
+      </button>
+      <div data-testid="provider-detail">{providerData.displayName}</div>
+    </div>
+  ),
+}));
+
+vi.mock(import('react-i18next'), async (importOriginal) => {
+  const actual = await importOriginal();
+
+  return {
+    ...actual,
+    useTranslation: () => ({
+      t: (key: string, options?: { count?: number }) => {
+        const translations: Record<string, string> = {
+          'authMonitor.accounts': 'Accounts',
+          'authMonitor.success': 'Success',
+          'authMonitor.failed': 'Failed',
+          'authMonitor.successRate': 'Success Rate',
+        };
+
+        if (key === 'authMonitor.accountsCount') {
+          return `${options?.count ?? 0} accounts`;
+        }
+
+        return translations[key] ?? key;
+      },
+    }),
+  };
+});
+
+const { useAuthMonitorDataMock } = vi.hoisted(() => ({
+  useAuthMonitorDataMock: vi.fn<() => AuthMonitorData>(),
+}));
+
+vi.mock('@/components/monitoring/auth-monitor/hooks', () => ({
+  useAuthMonitorData: useAuthMonitorDataMock,
+}));
+
+function getSummaryRow() {
+  const accountsLabel = screen.getByText('Accounts');
+  const summaryRow = accountsLabel.parentElement?.parentElement?.parentElement;
+
+  if (!summaryRow) {
+    throw new Error('Unable to locate the auth monitor summary row.');
+  }
+
+  return summaryRow;
+}
+
+function getSummaryCard(label: string) {
+  const labelNode = within(getSummaryRow()).getByText(label);
+  const card = labelNode.closest('div')?.parentElement;
+
+  if (!card) {
+    throw new Error(`Unable to locate summary card for label "${label}".`);
+  }
+
+  return card;
+}
+
+const providerStats = [
+  {
+    provider: 'gemini',
+    displayName: 'Google Gemini',
+    totalRequests: 15,
+    successCount: 12,
+    failureCount: 3,
+    accountCount: 2,
+    accounts: [
+      {
+        id: 'gemini-primary',
+        email: 'gemini-primary@example.com',
+        tokenFile: '/tmp/gemini-primary.json',
+        provider: 'gemini',
+        displayName: 'Google Gemini',
+        isDefault: true,
+        successCount: 10,
+        failureCount: 2,
+        color: '#4285F4',
+      },
+      {
+        id: 'gemini-secondary',
+        email: 'gemini-secondary@example.com',
+        tokenFile: '/tmp/gemini-secondary.json',
+        provider: 'gemini',
+        displayName: 'Google Gemini',
+        isDefault: false,
+        successCount: 2,
+        failureCount: 1,
+        color: '#34A853',
+      },
+    ],
+  },
+  {
+    provider: 'codex',
+    displayName: 'OpenAI Codex',
+    totalRequests: 27,
+    successCount: 23,
+    failureCount: 4,
+    accountCount: 2,
+    accounts: [
+      {
+        id: 'codex-primary',
+        email: 'codex-primary@example.com',
+        tokenFile: '/tmp/codex-primary.json',
+        provider: 'codex',
+        displayName: 'OpenAI Codex',
+        isDefault: true,
+        successCount: 15,
+        failureCount: 2,
+        color: '#10a37f',
+      },
+      {
+        id: 'codex-secondary',
+        email: 'codex-secondary@example.com',
+        tokenFile: '/tmp/codex-secondary.json',
+        provider: 'codex',
+        displayName: 'OpenAI Codex',
+        isDefault: false,
+        successCount: 8,
+        failureCount: 2,
+        color: '#0f766e',
+      },
+    ],
+  },
+] satisfies AuthMonitorData['providerStats'];
+
+const authMonitorData: AuthMonitorData = {
+  accounts: providerStats.flatMap((provider) => provider.accounts),
+  totalSuccess: 35,
+  totalFailure: 7,
+  totalRequests: 42,
+  providerStats,
+  overallSuccessRate: 83,
+  isLoading: false,
+  error: null,
+  timeSinceUpdate: '2s ago',
+};
+
+describe('AuthMonitor', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    vi.mocked(window.localStorage.getItem).mockReturnValue(null);
+    useAuthMonitorDataMock.mockReturnValue(authMonitorData);
+  });
+
+  it('scopes header and summary metrics to the selected provider detail view', async () => {
+    render(<AuthMonitor />);
+
+    expect(screen.getByText('4 accounts')).toBeInTheDocument();
+    expect(screen.getByText('42 req')).toBeInTheDocument();
+    expect(within(getSummaryCard('Accounts')).getByText('4')).toBeInTheDocument();
+    expect(within(getSummaryCard('Success')).getByText('35')).toBeInTheDocument();
+    expect(within(getSummaryCard('Failed')).getByText('7')).toBeInTheDocument();
+    expect(within(getSummaryCard('Success Rate')).getByText('83%')).toBeInTheDocument();
+
+    await userEvent.click(screen.getByRole('button', { name: /Google Gemini/i }));
+
+    expect(screen.getByTestId('provider-detail')).toHaveTextContent('Google Gemini');
+    expect(screen.getByText('2 accounts')).toBeInTheDocument();
+    expect(screen.getByText('15 req')).toBeInTheDocument();
+    expect(within(getSummaryCard('Accounts')).getByText('2')).toBeInTheDocument();
+    expect(within(getSummaryCard('Success')).getByText('12')).toBeInTheDocument();
+    expect(within(getSummaryCard('Failed')).getByText('3')).toBeInTheDocument();
+    expect(within(getSummaryCard('Success Rate')).getByText('80%')).toBeInTheDocument();
+  });
+});