fix: add CLIProxy account reauthentication

src/cliproxy/auth/auth-types.ts

@@ -389,6 +389,8 @@ export interface OAuthOptions {
   account?: string;
   add?: boolean;
   nickname?: string;
+  /** Existing account id to update during reauthentication. */
+  expectedAccountId?: string;
   /** If true, caller explicitly accepts Antigravity OAuth risk for this command/session. */
   acceptAgyRisk?: boolean;
   /** Kiro auth method override (CLI + Dashboard parity). */

src/cliproxy/auth/oauth-handler.ts

@@ -1131,8 +1131,9 @@ export async function triggerOAuth(
   // Check for existing accounts
   const existingAccounts = getProviderAccounts(provider);
   const existingNameMatch = nickname ? findAccountNameMatch(existingAccounts, nickname) : null;
+  const targetAccountId = options.expectedAccountId || existingNameMatch?.id;
   const nicknameError = !fromUI
-    ? getCliAuthNicknameError(provider, nickname, existingAccounts, existingNameMatch?.id)
+    ? getCliAuthNicknameError(provider, nickname, existingAccounts, targetAccountId)
     : null;
   if (nicknameError) {
     console.log(fail(nicknameError));
@@ -1144,7 +1145,7 @@ export async function triggerOAuth(
     const tokenDir = getProviderTokenDir(provider);
     const success = await importKiroToken(verbose);
     if (success) {
-      return registerAccountFromToken(provider, tokenDir, nickname, verbose, existingNameMatch?.id);
+      return registerAccountFromToken(provider, tokenDir, nickname, verbose, targetAccountId);
     }
     return null;
   }
@@ -1235,7 +1236,7 @@ export async function triggerOAuth(
       verbose,
       tokenDir,
       nickname,
-      existingNameMatch?.id,
+      targetAccountId,
       {
         gitlabBaseUrl: resolvedGitLabBaseUrl,
         gitlabPersonalAccessToken: options.gitlabPersonalAccessToken,
@@ -1251,7 +1252,7 @@ export async function triggerOAuth(
       verbose,
       tokenDir,
       nickname,
-      existingNameMatch?.id,
+      targetAccountId,
       {
         kiroMethod: provider === 'kiro' ? resolvedKiroMethod : undefined,
         gitlabBaseUrl: provider === 'gitlab' ? resolvedGitLabBaseUrl : undefined,
@@ -1336,7 +1337,7 @@ export async function triggerOAuth(
     verbose,
     isCLI,
     nickname,
-    expectedAccountId: existingNameMatch?.id,
+    expectedAccountId: targetAccountId,
     authFlowType: isDeviceCodeFlow ? 'device_code' : 'authorization_code',
     kiroMethod: provider === 'kiro' ? resolvedKiroMethod : undefined,
     manualCallback: useSelectedKiroLocalPasteCallback,

src/web-server/routes/cliproxy-auth-routes.ts

@@ -348,6 +348,24 @@ export function getStartAuthNicknameError(
   return null;
 }
 
+export function getReauthAccountTarget(
+  accountId: string | undefined,
+  existingAccounts: Array<{ id: string; nickname?: string }>
+): { account?: { id: string; nickname?: string }; error?: string } {
+  if (!accountId) {
+    return {};
+  }
+
+  const account = existingAccounts.find((candidate) => candidate.id === accountId);
+  if (!account) {
+    return {
+      error: `Account '${accountId}' not found for this provider`,
+    };
+  }
+
+  return { account };
+}
+
 /**
  * GET /api/cliproxy/auth - Get auth status for built-in CLIProxy profiles
  * Also fetches CLIProxyAPI stats to update lastUsedAt for active providers
@@ -623,6 +641,8 @@ router.post('/:provider/start', async (req: Request, res: Response): Promise<voi
   const requestBody =
     req.body && typeof req.body === 'object' ? (req.body as Record<string, unknown>) : {};
   const nicknameRaw = typeof requestBody.nickname === 'string' ? requestBody.nickname : undefined;
+  const accountId =
+    typeof requestBody.accountId === 'string' ? requestBody.accountId.trim() : undefined;
   const noIncognitoBody =
     typeof requestBody.noIncognito === 'boolean' ? requestBody.noIncognito : undefined;
   const kiroMethodRaw = requestBody.kiroMethod;
@@ -659,6 +679,16 @@ router.post('/:provider/start', async (req: Request, res: Response): Promise<voi
     return;
   }
 
+  const localProvider = provider as CLIProxyProvider;
+  const existingAccounts = getProviderAccounts(localProvider);
+  const reauthTarget = getReauthAccountTarget(accountId, existingAccounts);
+  if (reauthTarget.error) {
+    res.status(404).json({ error: reauthTarget.error });
+    return;
+  }
+  const targetAccountId = reauthTarget.account?.id;
+  const effectiveNickname = nickname || reauthTarget.account?.nickname;
+
   if (provider === 'kiro' && invalidKiroMethod) {
     res.status(400).json({
       error: 'Invalid kiroMethod. Supported: aws, aws-authcode, google, github, idc',
@@ -708,7 +738,6 @@ router.post('/:provider/start', async (req: Request, res: Response): Promise<voi
     }
 
     try {
-      const localProvider = provider as CLIProxyProvider;
       const knownTokenFiles = listProviderTokenSnapshots(localProvider);
       const response = await fetch(buildProxyUrl(target, '/v0/management/gitlab-auth-url'), {
         method: 'POST',
@@ -738,7 +767,8 @@ router.post('/:provider/start', async (req: Request, res: Response): Promise<voi
 
       const tokenSnapshot = findNewTokenSnapshot(
         listProviderTokenSnapshots(localProvider),
-        knownTokenFiles
+        knownTokenFiles,
+        targetAccountId
       );
       if (!tokenSnapshot) {
         res.status(409).json({
@@ -750,9 +780,9 @@ router.post('/:provider/start', async (req: Request, res: Response): Promise<voi
       const account = registerAccountFromToken(
         localProvider,
         getProviderTokenDir(localProvider),
-        nickname,
+        effectiveNickname,
         false,
-        tokenSnapshot.file
+        targetAccountId || tokenSnapshot.file
       );
       if (!account) {
         res.status(409).json({
@@ -784,11 +814,11 @@ router.post('/:provider/start', async (req: Request, res: Response): Promise<voi
     }
   }
 
-  const existingAccounts = getProviderAccounts(provider as CLIProxyProvider);
   const nicknameError = getStartAuthNicknameError(
-    provider as CLIProxyProvider,
-    nickname,
-    existingAccounts
+    localProvider,
+    effectiveNickname,
+    existingAccounts,
+    targetAccountId
   );
   if (nicknameError) {
     res.status(400).json(nicknameError);
@@ -808,7 +838,8 @@ router.post('/:provider/start', async (req: Request, res: Response): Promise<voi
     const account = await triggerOAuth(provider as CLIProxyProvider, {
       add: true, // Always add mode from UI
       headless: false, // Force interactive mode
-      nickname: nickname || undefined,
+      nickname: effectiveNickname || undefined,
+      expectedAccountId: targetAccountId,
       acceptAgyRisk: provider === 'agy',
       kiroMethod: provider === 'kiro' ? kiroMethod : undefined,
       kiroIDCStartUrl: provider === 'kiro' ? kiroIDCStartUrl : undefined,
@@ -971,6 +1002,8 @@ router.post('/:provider/start-url', async (req: Request, res: Response): Promise
   const requestBody =
     req.body && typeof req.body === 'object' ? (req.body as Record<string, unknown>) : {};
   const nicknameRaw = typeof requestBody.nickname === 'string' ? requestBody.nickname : undefined;
+  const accountId =
+    typeof requestBody.accountId === 'string' ? requestBody.accountId.trim() : undefined;
   const kiroMethodRaw = requestBody.kiroMethod;
   const gitlabAuthModeRaw = requestBody.gitlabAuthMode;
   const gitlabBaseUrl =
@@ -1037,11 +1070,20 @@ router.post('/:provider/start-url', async (req: Request, res: Response): Promise
     return;
   }
 
-  const existingAccounts = getProviderAccounts(provider as CLIProxyProvider);
+  const localProvider = provider as CLIProxyProvider;
+  const existingAccounts = getProviderAccounts(localProvider);
+  const reauthTarget = getReauthAccountTarget(accountId, existingAccounts);
+  if (reauthTarget.error) {
+    res.status(404).json({ error: reauthTarget.error });
+    return;
+  }
+  const targetAccountId = reauthTarget.account?.id;
+  const effectiveNickname = nickname || reauthTarget.account?.nickname;
   const nicknameError = getStartAuthNicknameError(
-    provider as CLIProxyProvider,
-    nickname,
-    existingAccounts
+    localProvider,
+    effectiveNickname,
+    existingAccounts,
+    targetAccountId
   );
   if (nicknameError) {
     res.status(400).json(nicknameError);
@@ -1136,8 +1178,9 @@ router.post('/:provider/start-url', async (req: Request, res: Response): Promise
 
     if (oauthState) {
       rememberManualAuthState(oauthState, {
-        nickname: nickname || undefined,
-        knownTokenFiles: listProviderTokenSnapshots(provider as CLIProxyProvider),
+        nickname: effectiveNickname || undefined,
+        expectedAccountId: targetAccountId,
+        knownTokenFiles: listProviderTokenSnapshots(localProvider),
       });
     }
 
@@ -1237,7 +1280,7 @@ router.get('/:provider/status', async (req: Request, res: Response): Promise<voi
         getProviderTokenDir(localProvider),
         pendingAuth.nickname,
         false,
-        tokenSnapshot.file
+        pendingAuth.expectedAccountId || tokenSnapshot.file
       );
 
       if (!account) {
@@ -1386,7 +1429,7 @@ router.post('/:provider/submit-callback', async (req: Request, res: Response): P
         getProviderTokenDir(localProvider),
         pendingAuth.nickname,
         false,
-        tokenSnapshot.file
+        pendingAuth.expectedAccountId || tokenSnapshot.file
       );
 
       if (!account) {

tests/unit/web-server/cliproxy-auth-routes-manual-callback.test.ts

@@ -6,6 +6,7 @@ import * as path from 'path';
 import * as http from 'http';
 import type { Server } from 'http';
 import cliproxyAuthRoutes from '../../../src/web-server/routes/cliproxy-auth-routes';
+import { registerAccountFromToken } from '../../../src/cliproxy/auth/token-manager';
 import {
   clearQuotaCache,
   getCachedQuota,
@@ -593,6 +594,61 @@ describe('cliproxy-auth-routes manual callback nickname persistence', () => {
     }
   });
 
+  it('reauthenticates a targeted existing Codex account when its token file is rewritten', async () => {
+    const tokenDir = path.join(tempHome, '.ccs', 'cliproxy', 'auth');
+    fs.mkdirSync(tokenDir, { recursive: true });
+    const tokenPath = path.join(tokenDir, 'codex-existing@example.com.json');
+    fs.writeFileSync(
+      tokenPath,
+      JSON.stringify({ type: 'codex', email: 'existing@example.com', version: 1 }),
+      'utf8'
+    );
+
+    const initialAccount = registerAccountFromToken('codex', tokenDir, 'work');
+    expect(initialAccount?.id).toBe('existing@example.com');
+
+    mockFetch([
+      {
+        url: /\/v0\/management\/codex-auth-url\?is_webui=true$/,
+        response: {
+          auth_url: 'https://auth.example.com/authorize?state=state-targeted-rewrite',
+          state: 'state-targeted-rewrite',
+        },
+      },
+      {
+        url: /\/v0\/management\/get-auth-status\?state=state-targeted-rewrite$/,
+        response: { status: 'ok' },
+      },
+    ]);
+
+    const startResponse = await postJson('/api/cliproxy/auth/codex/start-url', {
+      accountId: 'existing@example.com',
+    });
+    expect(startResponse.status).toBe(200);
+
+    fs.writeFileSync(
+      tokenPath,
+      JSON.stringify({ type: 'codex', email: 'existing@example.com', version: 2 }),
+      'utf8'
+    );
+
+    const statusResponse = await getJson(
+      '/api/cliproxy/auth/codex/status?state=state-targeted-rewrite'
+    );
+
+    expect(statusResponse.status).toBe(200);
+    expect(statusResponse.body).toEqual({
+      status: 'ok',
+      account: {
+        id: 'existing@example.com',
+        email: 'existing@example.com',
+        nickname: 'work',
+        provider: 'codex',
+        isDefault: true,
+      },
+    });
+  });
+
   it('registers the new account before reporting polled auth success', async () => {
     mockFetch([
       {

tests/unit/web-server/cliproxy-auth-routes.test.ts

@@ -1,6 +1,7 @@
 import { describe, expect, it } from 'bun:test';
 import {
   getKiroStartIDCValidationError,
+  getReauthAccountTarget,
   getStartAuthFailureMessage,
   getStartAuthNicknameError,
   getStartUrlUnsupportedReason,
@@ -142,3 +143,27 @@ describe('cliproxy-auth-routes nickname validation', () => {
     ).toBeNull();
   });
 });
+
+describe('cliproxy-auth-routes reauth account targeting', () => {
+  const existingAccounts = [
+    { id: 'codex-user@example.com', nickname: 'work' },
+    { id: 'codex-personal@example.com', nickname: 'personal' },
+  ];
+
+  it('does not require a target for normal add-account auth', () => {
+    expect(getReauthAccountTarget(undefined, existingAccounts)).toEqual({});
+    expect(getReauthAccountTarget('', existingAccounts)).toEqual({});
+  });
+
+  it('resolves an existing account target for reauth', () => {
+    expect(getReauthAccountTarget('codex-user@example.com', existingAccounts)).toEqual({
+      account: { id: 'codex-user@example.com', nickname: 'work' },
+    });
+  });
+
+  it('rejects unknown account targets instead of falling back to ambiguous registration', () => {
+    expect(getReauthAccountTarget('missing', existingAccounts)).toEqual({
+      error: "Account 'missing' not found for this provider",
+    });
+  });
+});

ui/src/components/account/add-account-dialog.tsx

@@ -29,7 +29,7 @@ import { Loader2, ExternalLink, User, Download, Copy, Check, ShieldAlert } from
 import { useKiroImport } from '@/hooks/use-cliproxy';
 import { useCliproxyAuthFlow } from '@/hooks/use-cliproxy-auth-flow';
 import { applyDefaultPreset } from '@/lib/preset-utils';
-import type { CliproxyProviderCatalog } from '@/lib/api-client';
+import type { CliproxyProviderCatalog, OAuthAccount } from '@/lib/api-client';
 import { AccountSafetyWarningCard } from '@/components/account/account-safety-warning-card';
 import { AntigravityResponsibilityChecklist } from '@/components/account/antigravity-responsibility-checklist';
 import {
@@ -58,6 +58,8 @@ interface AddAccountDialogProps {
   provider: string;
   displayName: string;
   catalog?: CliproxyProviderCatalog;
+  /** Existing account to reauthenticate instead of adding a new account. */
+  account?: OAuthAccount;
   /** Whether this is the first account being added (shows different toast message) */
   isFirstAccount?: boolean;
 }
@@ -77,6 +79,7 @@ export function AddAccountDialog({
   provider,
   displayName,
   catalog,
+  account,
   isFirstAccount = false,
 }: AddAccountDialogProps) {
   const [nickname, setNickname] = useState('');
@@ -127,6 +130,8 @@ export function AddAccountDialog({
   const gitlabBaseUrlTrimmed = gitlabBaseUrl.trim();
   const gitlabPersonalAccessTokenTrimmed = gitlabPersonalAccessToken.trim();
   const errorMessage = localError || authFlow.error;
+  const isReauth = Boolean(account);
+  const accountLabel = account?.email || account?.nickname || account?.id || displayName;
 
   const fetchPowerUserModeState = useCallback(async (): Promise<boolean> => {
     const response = await fetch('/api/settings/auth/antigravity-risk');
@@ -325,7 +330,8 @@ export function AddAccountDialog({
     }
     wasAuthenticatingRef.current = true;
     authFlow.startAuth(provider, {
-      nickname: nicknameTrimmed || undefined,
+      accountId: account?.id,
+      nickname: account ? account.nickname : nicknameTrimmed || undefined,
       kiroMethod: isKiro ? kiroAuthMethod : undefined,
       kiroIDCStartUrl: isKiroIdc ? kiroIDCStartUrlTrimmed : undefined,
       kiroIDCRegion: isKiroIdc && kiroIDCRegionTrimmed ? kiroIDCRegionTrimmed : undefined,
@@ -385,13 +391,19 @@ export function AddAccountDialog({
         }}
       >
         <DialogHeader className="min-w-0 px-6 pt-6 pr-12">
-          <DialogTitle>{t('addAccountDialog.title', { displayName })}</DialogTitle>
+          <DialogTitle>
+            {isReauth
+              ? `Reauthenticate ${displayName}`
+              : t('addAccountDialog.title', { displayName })}
+          </DialogTitle>
           <DialogDescription>
-            {isKiro
-              ? t('addAccountDialog.descKiro')
-              : isDeviceCode
-                ? t('addAccountDialog.descDeviceCode')
-                : t('addAccountDialog.descOauth')}
+            {isReauth
+              ? `Refresh credentials for ${accountLabel}.`
+              : isKiro
+                ? t('addAccountDialog.descKiro')
+                : isDeviceCode
+                  ? t('addAccountDialog.descDeviceCode')
+                  : t('addAccountDialog.descOauth')}
           </DialogDescription>
         </DialogHeader>
 
@@ -600,7 +612,16 @@ export function AddAccountDialog({
           )}
 
           {/* Nickname input - only show before auth starts */}
-          {!showAuthUI && (
+          {!showAuthUI && isReauth && (
+            <div className="rounded-md border bg-muted/30 px-3 py-2 text-sm">
+              <div className="font-medium">{accountLabel}</div>
+              <div className="text-xs text-muted-foreground">
+                This sign-in updates the selected account instead of creating another account.
+              </div>
+            </div>
+          )}
+
+          {!showAuthUI && !isReauth && (
             <div className="space-y-2">
               <Label htmlFor="nickname">{t('addAccountDialog.nicknameOptional')}</Label>
               <div className="flex items-center gap-2">
@@ -784,7 +805,7 @@ export function AddAccountDialog({
                 }
               >
                 <ExternalLink className="w-4 h-4 mr-2" />
-                {t('addAccountDialog.authenticate')}
+                {isReauth ? 'Reauthenticate' : t('addAccountDialog.authenticate')}
               </Button>
             )}
           </div>

ui/src/components/cliproxy/provider-editor/account-item.tsx

@@ -24,6 +24,7 @@ import {
   MoreHorizontal,
   Pause,
   Play,
+  RefreshCw,
   Star,
   Trash2,
 } from 'lucide-react';
@@ -87,6 +88,7 @@ export function AccountItem({
   account,
   onSetDefault,
   onRemove,
+  onReauth,
   onPauseToggle,
   isRemoving,
   isPausingAccount,
@@ -167,6 +169,12 @@ export function AccountItem({
             Set as default
           </DropdownMenuItem>
         )}
+        {onReauth && (
+          <DropdownMenuItem onClick={onReauth}>
+            <RefreshCw className="w-4 h-4 mr-2" />
+            Reauthenticate
+          </DropdownMenuItem>
+        )}
         <DropdownMenuItem
           className="text-destructive focus:text-destructive"
           onClick={onRemove}

ui/src/components/cliproxy/provider-editor/accounts-section.tsx

@@ -17,6 +17,7 @@ import { useTranslation } from 'react-i18next';
 interface AccountsSectionProps {
   accounts: OAuthAccount[];
   onAddAccount: () => void;
+  onReauthAccount?: (account: OAuthAccount) => void;
   onSetDefault: (accountId: string) => void;
   onRemoveAccount: (accountId: string) => void;
   onPauseToggle?: (accountId: string, paused: boolean) => void;
@@ -48,6 +49,7 @@ interface AccountsSectionProps {
 export function AccountsSection({
   accounts,
   onAddAccount,
+  onReauthAccount,
   onSetDefault,
   onRemoveAccount,
   onPauseToggle,
@@ -175,6 +177,7 @@ export function AccountsSection({
               account={account}
               onSetDefault={() => onSetDefault(account.id)}
               onRemove={() => onRemoveAccount(account.id)}
+              onReauth={onReauthAccount ? () => onReauthAccount(account) : undefined}
               onPauseToggle={
                 onPauseToggle ? (paused) => onPauseToggle(account.id, paused) : undefined
               }

ui/src/components/cliproxy/provider-editor/index.tsx

@@ -42,6 +42,7 @@ export function ProviderEditor({
   defaultTarget,
   topNotice,
   onAddAccount,
+  onReauthAccount,
   onSetDefault,
   onRemoveAccount,
   onPauseToggle,
@@ -282,6 +283,7 @@ export function ProviderEditor({
                     isDeletePending={deletePresetMutation.isPending}
                     accounts={accounts}
                     onAddAccount={onAddAccount}
+                    onReauthAccount={onReauthAccount}
                     onSetDefault={onSetDefault}
                     onRemoveAccount={onRemoveAccount}
                     onPauseToggle={onPauseToggle}

ui/src/components/cliproxy/provider-editor/model-config-tab.tsx

@@ -40,6 +40,7 @@ interface ModelConfigTabProps {
   isDeletePending?: boolean;
   accounts: OAuthAccount[];
   onAddAccount: () => void;
+  onReauthAccount?: (account: OAuthAccount) => void;
   onSetDefault: (accountId: string) => void;
   onRemoveAccount: (accountId: string) => void;
   onPauseToggle?: (accountId: string, paused: boolean) => void;
@@ -82,6 +83,7 @@ export function ModelConfigTab({
   isDeletePending,
   accounts,
   onAddAccount,
+  onReauthAccount,
   onSetDefault,
   onRemoveAccount,
   onPauseToggle,
@@ -176,6 +178,7 @@ export function ModelConfigTab({
         <AccountsSection
           accounts={accounts}
           onAddAccount={onAddAccount}
+          onReauthAccount={onReauthAccount}
           onSetDefault={onSetDefault}
           onRemoveAccount={onRemoveAccount}
           onPauseToggle={onPauseToggle}

ui/src/components/cliproxy/provider-editor/types.ts

@@ -39,6 +39,7 @@ export interface ProviderEditorProps {
   /** Optional contextual notice shown directly under the editor header */
   topNotice?: ReactNode;
   onAddAccount: () => void;
+  onReauthAccount?: (account: OAuthAccount) => void;
   onSetDefault: (accountId: string) => void;
   onRemoveAccount: (accountId: string) => void;
   onPauseToggle?: (accountId: string, paused: boolean) => void;
@@ -63,6 +64,7 @@ export interface AccountItemProps {
   account: OAuthAccount;
   onSetDefault: () => void;
   onRemove: () => void;
+  onReauth?: () => void;
   onPauseToggle?: (paused: boolean) => void;
   /** Solo mode: activate this account, pause all others */
   onSoloMode?: () => void;

ui/src/components/monitoring/auth-monitor/index.tsx

@@ -16,7 +16,7 @@ import {
   usePauseAccount,
   useResumeAccount,
 } from '@/hooks/use-cliproxy';
-import { Activity, CheckCircle2, XCircle, Radio } from 'lucide-react';
+import { Activity, AlertTriangle, CheckCircle2, XCircle, Radio } from 'lucide-react';
 
 import { useAuthMonitorData } from './hooks';
 import { LivePulse } from './components/live-pulse';
@@ -86,6 +86,8 @@ export function AuthMonitor() {
   const displayedSuccessRate = selectedProviderData
     ? getSuccessRate(selectedProviderData.successCount, selectedProviderData.failureCount)
     : overallSuccessRate;
+  const showHighFailureGuidance =
+    displayedAccountCount >= 5 && displayedFailure >= 20 && displayedSuccessRate < 50;
 
   const handlePauseToggle = (accountIds: string[], paused: boolean) => {
     if (
@@ -204,6 +206,21 @@ export function AuthMonitor() {
         />
       </div>
 
+      {showHighFailureGuidance && (
+        <div className="flex items-start gap-3 border-b border-amber-500/30 bg-amber-500/10 px-4 py-3 text-xs">
+          <AlertTriangle className="mt-0.5 h-4 w-4 shrink-0 text-amber-600 dark:text-amber-400" />
+          <div className="space-y-1">
+            <p className="font-semibold text-foreground">High CLIProxy failure rate detected</p>
+            <p className="text-muted-foreground">
+              Select the affected provider, pause failing accounts, then check{' '}
+              <code className="rounded bg-muted px-1 py-0.5 font-mono">ccs cliproxy routing</code>.
+              For large Codex pools, prefer a smaller healthy active set and attach CLIProxy logs if
+              failures continue.
+            </p>
+          </div>
+        </div>
+      )}
+
       {/* Flow Visualization */}
       <div className="relative overflow-hidden">
         {selectedProviderData ? (

ui/src/hooks/use-cliproxy-auth-flow.ts

@@ -25,6 +25,7 @@ interface AuthFlowState {
 }
 
 interface StartAuthOptions {
+  accountId?: string;
   nickname?: string;
   kiroMethod?: string;
   kiroIDCStartUrl?: string;
@@ -286,6 +287,7 @@ export function useCliproxyAuthFlow() {
       const deviceCodeFlow = flowType === 'device_code';
       const startEndpoint = options?.startEndpoint || (deviceCodeFlow ? 'start' : 'start-url');
       const payload = {
+        accountId: options?.accountId,
         nickname: options?.nickname,
         kiroMethod: options?.kiroMethod,
         kiroIDCStartUrl: options?.kiroIDCStartUrl,

ui/src/pages/cliproxy.tsx

@@ -31,7 +31,7 @@ import {
   useBulkResumeAccounts,
   useDeleteVariant,
 } from '@/hooks/use-cliproxy';
-import type { AuthStatus, Variant } from '@/lib/api-client';
+import type { AuthStatus, OAuthAccount, Variant } from '@/lib/api-client';
 import { buildUiCatalogs } from '@/lib/model-catalogs';
 import {
   getProviderDisplayName,
@@ -256,6 +256,7 @@ export function CliproxyPage() {
     provider: string;
     displayName: string;
     isFirstAccount: boolean;
+    account?: OAuthAccount;
   } | null>(() => {
     if (typeof window === 'undefined') {
       return null;
@@ -404,6 +405,23 @@ export function CliproxyPage() {
     });
   };
 
+  const handleReauthAccount = (
+    provider: string,
+    displayName: string,
+    accounts: OAuthAccount[] | undefined,
+    accountId: string
+  ) => {
+    const account = accounts?.find((candidate) => candidate.id === accountId);
+    if (!account) return;
+
+    setAddAccountProvider({
+      provider,
+      displayName,
+      isFirstAccount: false,
+      account,
+    });
+  };
+
   return (
     <div className="flex h-full min-h-0 overflow-hidden">
       {/* Left Sidebar */}
@@ -567,6 +585,14 @@ export function CliproxyPage() {
                   isFirstAccount: (parentAuthForVariant.accounts?.length || 0) === 0,
                 })
               }
+              onReauthAccount={(account) =>
+                handleReauthAccount(
+                  selectedVariantData.provider,
+                  parentAuthForVariant.displayName,
+                  parentAuthForVariant.accounts,
+                  account.id
+                )
+              }
               onSetDefault={(accountId) =>
                 setDefaultMutation.mutate({
                   provider: selectedVariantData.provider,
@@ -617,6 +643,14 @@ export function CliproxyPage() {
                   isFirstAccount: (selectedStatus.accounts?.length || 0) === 0,
                 })
               }
+              onReauthAccount={(account) =>
+                handleReauthAccount(
+                  selectedStatus.provider,
+                  selectedStatus.displayName,
+                  selectedStatus.accounts,
+                  account.id
+                )
+              }
               onSetDefault={(accountId) =>
                 setDefaultMutation.mutate({
                   provider: selectedStatus.provider,
@@ -663,6 +697,7 @@ export function CliproxyPage() {
             : undefined
         }
         isFirstAccount={addAccountProvider?.isFirstAccount || false}
+        account={addAccountProvider?.account}
       />
     </div>
   );

ui/tests/unit/hooks/use-cliproxy-auth-flow.test.tsx

@@ -86,6 +86,47 @@ describe('useCliproxyAuthFlow', () => {
     );
   });
 
+  it('includes the selected account id when reauth starts from the dashboard', async () => {
+    const fetchMock = vi.fn((input: RequestInfo | URL) => {
+      const url = String(input);
+
+      if (url.includes('/codex/start-url')) {
+        return Promise.resolve(
+          createJsonResponse({
+            success: true,
+            authUrl: 'https://auth.example.com/codex?state=codex-reauth',
+            state: 'codex-reauth',
+          })
+        );
+      }
+
+      if (url.includes('/status?state=codex-reauth')) {
+        return Promise.resolve(createJsonResponse({ status: 'wait' }));
+      }
+
+      return Promise.reject(new Error(`Unexpected fetch: ${url}`));
+    });
+
+    vi.stubGlobal('fetch', fetchMock);
+
+    const { result } = renderHook(() => useCliproxyAuthFlow(), { wrapper });
+
+    await act(async () => {
+      await result.current.startAuth('codex', {
+        accountId: 'existing@example.com',
+        startEndpoint: 'start-url',
+      });
+    });
+
+    expect(fetchMock).toHaveBeenCalledWith(
+      '/api/cliproxy/auth/codex/start-url',
+      expect.objectContaining({
+        method: 'POST',
+        body: expect.stringContaining('"accountId":"existing@example.com"'),
+      })
+    );
+  });
+
   it('surfaces manual OAuth start guidance from the dashboard API', async () => {
     const guidance = [
       'Start local CLIProxy first: ccs cliproxy start',

ui/tests/unit/ui/components/monitoring/auth-monitor/auth-monitor.test.tsx

@@ -191,4 +191,41 @@ describe('AuthMonitor', () => {
     expect(within(getSummaryCard('Failed')).getByText('3')).toBeInTheDocument();
     expect(within(getSummaryCard('Success Rate')).getByText('80%')).toBeInTheDocument();
   });
+
+  it('shows CLIProxy guidance when a large account pool has a high failure rate', () => {
+    useAuthMonitorDataMock.mockReturnValue({
+      ...authMonitorData,
+      accounts: Array.from({ length: 5 }, (_, index) => ({
+        id: `codex-${index}`,
+        email: `codex-${index}@example.com`,
+        tokenFile: `/tmp/codex-${index}.json`,
+        provider: 'codex',
+        displayName: 'OpenAI Codex',
+        isDefault: index === 0,
+        successCount: index === 0 ? 1 : 0,
+        failureCount: 5,
+        color: '#10a37f',
+      })),
+      totalSuccess: 1,
+      totalFailure: 25,
+      totalRequests: 26,
+      providerStats: [
+        {
+          provider: 'codex',
+          displayName: 'OpenAI Codex',
+          totalRequests: 26,
+          successCount: 1,
+          failureCount: 25,
+          accountCount: 5,
+          accounts: [],
+        },
+      ],
+      overallSuccessRate: 4,
+    });
+
+    render(<AuthMonitor />);
+
+    expect(screen.getByText('High CLIProxy failure rate detected')).toBeInTheDocument();
+    expect(screen.getByText(/ccs cliproxy routing/)).toBeInTheDocument();
+  });
 });