hotfix: close cliproxy plus fallback gaps

src/cliproxy/binary-manager.ts

@@ -31,12 +31,47 @@ import {
 
 import type { CLIProxyBackend } from './types';
 
+export const CLIPROXY_PLUS_TRACKING_URL = 'https://github.com/kaitranntt/ccs/issues/1062';
+
 /**
  * Track whether we've already warned the user about the Plus fallback this
  * process lifetime. Prevents spamming the warning on every command.
  */
 let plusFallbackWarned = false;
 
+function emitPlusFallbackWarning(): void {
+  if (plusFallbackWarned) return;
+  plusFallbackWarned = true;
+  process.stderr.write(
+    `${warn(
+      'CLIProxyAPIPlus upstream repo is currently unavailable; local CLIProxy is falling back to ' +
+        '`backend: original`. Run `ccs config` to update your saved config. ' +
+        `Tracking: ${CLIPROXY_PLUS_TRACKING_URL}`
+    )}\n`
+  );
+}
+
+export function getPlusBackendUnavailableMessage(provider?: string): string {
+  const prefix = provider
+    ? `${provider} requires CLIProxyAPIPlus,`
+    : 'CLIProxyAPIPlus upstream repo is currently unavailable,';
+  return (
+    `${prefix} but local CLIProxy currently supports only \`backend: original\`. ` +
+    `Tracking: ${CLIPROXY_PLUS_TRACKING_URL}`
+  );
+}
+
+export function resolveLocalBackend(
+  backend: CLIProxyBackend = DEFAULT_BACKEND,
+  options: { warnOnFallback?: boolean } = {}
+): CLIProxyBackend {
+  if (backend !== 'plus') return backend;
+  if (options.warnOnFallback) {
+    emitPlusFallbackWarning();
+  }
+  return 'original';
+}
+
 /**
  * Get backend from config, with runtime fallback to 'original' when the user
  * still has `backend: plus` saved.
@@ -47,7 +82,7 @@ let plusFallbackWarned = false;
  * runtime and warn once. This keeps existing installations working without a
  * reconfig step, while CCS self-maintains its own Plus fork (future work).
  */
-function getConfiguredBackend(): CLIProxyBackend {
+export function getConfiguredBackend(options: { warnOnFallback?: boolean } = {}): CLIProxyBackend {
   let configured: CLIProxyBackend;
   try {
     const config = loadOrCreateUnifiedConfig();
@@ -56,19 +91,7 @@ function getConfiguredBackend(): CLIProxyBackend {
     return DEFAULT_BACKEND;
   }
 
-  if (configured === 'plus') {
-    if (!plusFallbackWarned) {
-      plusFallbackWarned = true;
-      warn(
-        'CLIProxyAPIPlus upstream repo is currently unavailable; falling back to ' +
-          '`backend: original`. Run `ccs config` to update your saved config. ' +
-          'Tracking: https://github.com/kaitranntt/ccs/issues/1062'
-      );
-    }
-    return 'original';
-  }
-
-  return configured;
+  return resolveLocalBackend(configured, options);
 }
 
 /**
@@ -104,7 +127,9 @@ export class BinaryManager {
   private backend: CLIProxyBackend;
 
   constructor(config: Partial<BinaryManagerConfig> = {}, backend?: CLIProxyBackend) {
-    this.backend = backend ?? getConfiguredBackend();
+    this.backend = backend
+      ? resolveLocalBackend(backend, { warnOnFallback: true })
+      : getConfiguredBackend({ warnOnFallback: true });
     const defaultConfig = createDefaultConfig(this.backend);
     this.config = { ...defaultConfig, ...config };
   }
@@ -155,7 +180,7 @@ export async function ensureCLIProxyBinary(
   verbose = false,
   options: EnsureCLIProxyBinaryOptions = {}
 ): Promise<string> {
-  const backend = getConfiguredBackend();
+  const backend = getConfiguredBackend({ warnOnFallback: true });
 
   // Migrate old shared pin to backend-specific location (one-time migration)
   migrateVersionPin(backend);
@@ -186,19 +211,25 @@ export async function ensureCLIProxyBinary(
 
 /** Check if CLIProxyAPI binary is installed */
 export function isCLIProxyInstalled(backend?: CLIProxyBackend): boolean {
-  const effectiveBackend = backend ?? getConfiguredBackend();
+  const effectiveBackend = backend
+    ? resolveLocalBackend(backend, { warnOnFallback: true })
+    : getConfiguredBackend({ warnOnFallback: true });
   return new BinaryManager({}, effectiveBackend).isBinaryInstalled();
 }
 
 /** Get CLIProxyAPI binary path (may not exist) */
 export function getCLIProxyPath(backend?: CLIProxyBackend): string {
-  const effectiveBackend = backend ?? getConfiguredBackend();
+  const effectiveBackend = backend
+    ? resolveLocalBackend(backend, { warnOnFallback: true })
+    : getConfiguredBackend({ warnOnFallback: true });
   return new BinaryManager({}, effectiveBackend).getBinaryPath();
 }
 
 /** Get installed CLIProxyAPI version from .version file */
 export function getInstalledCliproxyVersion(backend?: CLIProxyBackend): string {
-  const effectiveBackend = backend ?? getConfiguredBackend();
+  const effectiveBackend = backend
+    ? resolveLocalBackend(backend, { warnOnFallback: true })
+    : getConfiguredBackend({ warnOnFallback: true });
   return readInstalledVersion(
     getBackendBinDir(effectiveBackend),
     BACKEND_CONFIG[effectiveBackend].fallbackVersion
@@ -224,7 +255,9 @@ export async function installCliproxyVersion(
   backend?: CLIProxyBackend,
   deps: InstallCliproxyVersionDeps = {}
 ): Promise<void> {
-  const effectiveBackend = backend ?? getConfiguredBackend();
+  const effectiveBackend = backend
+    ? resolveLocalBackend(backend, { warnOnFallback: true })
+    : getConfiguredBackend({ warnOnFallback: true });
   const manager =
     deps.createManager?.({ version, verbose, forceVersion: true }, effectiveBackend) ??
     new BinaryManager({ version, verbose, forceVersion: true }, effectiveBackend);
@@ -265,7 +298,9 @@ export async function installCliproxyVersion(
 
 /** Fetch the latest CLIProxyAPI version from GitHub API */
 export async function fetchLatestCliproxyVersion(backend?: CLIProxyBackend): Promise<string> {
-  const effectiveBackend = backend ?? getConfiguredBackend();
+  const effectiveBackend = backend
+    ? resolveLocalBackend(backend, { warnOnFallback: true })
+    : getConfiguredBackend({ warnOnFallback: true });
   const result = await new BinaryManager({}, effectiveBackend).checkForUpdates();
   return result.latestVersion;
 }
@@ -290,7 +325,9 @@ export interface CliproxyUpdateCheckResult {
 export async function checkCliproxyUpdate(
   backend?: CLIProxyBackend
 ): Promise<CliproxyUpdateCheckResult> {
-  const effectiveBackend = backend ?? getConfiguredBackend();
+  const effectiveBackend = backend
+    ? resolveLocalBackend(backend, { warnOnFallback: true })
+    : getConfiguredBackend({ warnOnFallback: true });
   const result = await new BinaryManager({}, effectiveBackend).checkForUpdates();
 
   // Import isNewerVersion for stability check

src/cliproxy/executor/index.ts

@@ -18,7 +18,11 @@ import { ProgressIndicator } from '../../utils/progress-indicator';
 import { ok, fail, info, warn } from '../../utils/ui';
 import { getCcsDir } from '../../utils/config-manager';
 import { escapeShellArg, getWindowsEscapedCommandShell } from '../../utils/shell-executor';
-import { ensureCLIProxyBinary } from '../binary-manager';
+import {
+  ensureCLIProxyBinary,
+  getConfiguredBackend,
+  getPlusBackendUnavailableMessage,
+} from '../binary-manager';
 import {
   generateConfig,
   getProviderConfig,
@@ -30,7 +34,6 @@ import {
 import { checkRemoteProxy } from '../remote-proxy-client';
 import { isAuthenticated } from '../auth-handler';
 import { CLIProxyProvider, CLIProxyBackend, PLUS_ONLY_PROVIDERS, ExecutorConfig } from '../types';
-import { DEFAULT_BACKEND } from '../platform-detector';
 import { configureProviderModel, getCurrentModel } from '../model-config';
 import { reconcileCodexModelForActivePlan } from '../codex-plan-compatibility';
 import { resolveProxyConfig, PROXY_CLI_FLAGS } from '../proxy-config-resolver';
@@ -211,23 +214,8 @@ export async function execClaudeWithCLIProxy(
   // 0. Resolve proxy configuration (CLI > ENV > config.yaml > defaults)
   const unifiedConfig = loadOrCreateUnifiedConfig();
 
-  // 0a. Runtime backend/provider validation
-  const backend: CLIProxyBackend = unifiedConfig.cliproxy?.backend ?? DEFAULT_BACKEND;
-
   // Collect all providers to validate (default + composite tiers)
   const allProviders = [provider, ...compositeProviders];
-  for (const p of allProviders) {
-    if (backend === 'original' && PLUS_ONLY_PROVIDERS.includes(p as CLIProxyProvider)) {
-      console.error('');
-      console.error(fail(`${p} requires CLIProxyAPIPlus backend`));
-      console.error('');
-      console.error('To use this provider, either:');
-      console.error('  1. Set `cliproxy.backend: plus` in ~/.ccs/config.yaml');
-      console.error('  2. Use --backend=plus flag: ccs ' + p + ' --backend=plus');
-      console.error('');
-      throw new Error(`Provider ${p} requires Plus backend`);
-    }
-  }
 
   const cliproxyServerConfig = unifiedConfig.cliproxy_server;
   const { config: proxyConfig, remainingArgs: argsWithoutProxy } = resolveProxyConfig(args, {
@@ -314,6 +302,7 @@ export async function execClaudeWithCLIProxy(
 
   // Check remote proxy if configured
   let useRemoteProxy = false;
+  let localBackend: CLIProxyBackend = 'original';
   if (proxyConfig.mode === 'remote' && proxyConfig.host) {
     const status = await checkRemoteProxy({
       host: proxyConfig.host,
@@ -361,6 +350,19 @@ export async function execClaudeWithCLIProxy(
     }
   }
 
+  if (!useRemoteProxy) {
+    localBackend = getConfiguredBackend({ warnOnFallback: true });
+
+    for (const p of allProviders) {
+      if (localBackend === 'original' && PLUS_ONLY_PROVIDERS.includes(p as CLIProxyProvider)) {
+        console.error('');
+        console.error(fail(getPlusBackendUnavailableMessage(p)));
+        console.error('');
+        throw new Error(`Provider ${p} is temporarily unavailable on local CLIProxy`);
+      }
+    }
+  }
+
   // Variables for local proxy mode
   let binaryPath: string | undefined;
   let sessionId: string | undefined;
@@ -1000,13 +1002,13 @@ export async function execClaudeWithCLIProxy(
         cfg.port,
         cfg.timeout,
         cfg.pollInterval,
-        backend,
+        localBackend,
         configPath
       );
 
       // Register session
       if (proxy.pid) {
-        sessionId = registerProxySession(cfg.port, proxy.pid, backend, verbose);
+        sessionId = registerProxySession(cfg.port, proxy.pid, localBackend, verbose);
       }
     }
   }

src/cliproxy/services/binary-service.ts

@@ -18,6 +18,7 @@ import {
   savePinnedVersion,
   clearPinnedVersion,
   isVersionPinned,
+  resolveLocalBackend,
 } from '../binary-manager';
 import { BACKEND_CONFIG, DEFAULT_BACKEND } from '../platform-detector';
 import { CLIProxyBackend } from '../types';
@@ -54,8 +55,10 @@ export interface LatestVersionResult {
  * Get current binary status for a specific backend
  */
 export function getBinaryStatus(backend?: CLIProxyBackend): BinaryStatusResult {
-  const effectiveBackend =
-    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND;
+  const effectiveBackend = resolveLocalBackend(
+    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND,
+    { warnOnFallback: true }
+  );
   const backendConfig = BACKEND_CONFIG[effectiveBackend];
   return {
     installed: isCLIProxyInstalled(effectiveBackend),
@@ -71,8 +74,10 @@ export function getBinaryStatus(backend?: CLIProxyBackend): BinaryStatusResult {
  * Check for latest version
  */
 export async function checkLatestVersion(backend?: CLIProxyBackend): Promise<LatestVersionResult> {
-  const effectiveBackend =
-    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND;
+  const effectiveBackend = resolveLocalBackend(
+    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND,
+    { warnOnFallback: true }
+  );
 
   try {
     // Use checkCliproxyUpdate which is backend-aware (uses correct GitHub repo)
@@ -119,8 +124,10 @@ export async function installVersion(
     };
   }
 
-  const effectiveBackend =
-    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND;
+  const effectiveBackend = resolveLocalBackend(
+    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND,
+    { warnOnFallback: true }
+  );
 
   try {
     await installCliproxyVersion(version, verbose, effectiveBackend);
@@ -147,8 +154,10 @@ export async function installLatest(
   verbose = false,
   backend?: CLIProxyBackend
 ): Promise<InstallResult> {
-  const effectiveBackend =
-    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND;
+  const effectiveBackend = resolveLocalBackend(
+    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND,
+    { warnOnFallback: true }
+  );
 
   try {
     const latestVersion = await fetchLatestCliproxyVersion(effectiveBackend);
@@ -184,8 +193,10 @@ export async function installLatest(
  * Check if a version is pinned
  */
 export function isPinned(backend?: CLIProxyBackend): boolean {
-  const effectiveBackend =
-    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND;
+  const effectiveBackend = resolveLocalBackend(
+    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND,
+    { warnOnFallback: true }
+  );
   return isVersionPinned(effectiveBackend);
 }
 
@@ -193,8 +204,10 @@ export function isPinned(backend?: CLIProxyBackend): boolean {
  * Get pinned version if any
  */
 export function getPinned(backend?: CLIProxyBackend): string | null {
-  const effectiveBackend =
-    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND;
+  const effectiveBackend = resolveLocalBackend(
+    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND,
+    { warnOnFallback: true }
+  );
   return getPinnedVersion(effectiveBackend);
 }
 
@@ -202,7 +215,9 @@ export function getPinned(backend?: CLIProxyBackend): string | null {
  * Clear version pin
  */
 export function clearPin(backend?: CLIProxyBackend): void {
-  const effectiveBackend =
-    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND;
+  const effectiveBackend = resolveLocalBackend(
+    backend ?? loadOrCreateUnifiedConfig().cliproxy?.backend ?? DEFAULT_BACKEND,
+    { warnOnFallback: true }
+  );
   clearPinnedVersion(effectiveBackend);
 }

src/cliproxy/services/variant-service.ts

@@ -8,12 +8,10 @@
 import * as os from 'os';
 import * as path from 'path';
 import { CLIProxyProfileName } from '../../auth/profile-detector';
-import { CLIProxyProvider, CLIProxyBackend, PLUS_ONLY_PROVIDERS } from '../types';
+import { CLIProxyProvider, PLUS_ONLY_PROVIDERS } from '../types';
 import { CompositeTierConfig, CompositeVariantConfig } from '../../config/unified-config-types';
 import type { TargetType } from '../../targets/target-adapter';
 import { isReservedName, isWindowsReservedName } from '../../config/reserved-names';
-import { loadOrCreateUnifiedConfig } from '../../config/unified-config-loader';
-import { DEFAULT_BACKEND } from '../platform-detector';
 import { isUnifiedMode } from '../../config/unified-config-loader';
 import { deleteConfigForPort } from '../config-generator';
 import { hasActiveSessions, deleteSessionLockForPort } from '../session-tracker';
@@ -44,6 +42,7 @@ import {
   removeVariantFromLegacyConfig,
   getNextAvailablePort,
 } from './variant-config-adapter';
+import { getConfiguredBackend, getPlusBackendUnavailableMessage } from '../binary-manager';
 
 // Re-export VariantConfig from adapter
 export type { VariantConfig } from './variant-config-adapter';
@@ -80,16 +79,15 @@ export function validateProfileName(name: string): string | null {
 
 /**
  * Validate provider/backend compatibility
- * Returns error message if provider requires Plus backend but original is configured
+ * Returns error message if a provider requires Plus while local CLIProxy is
+ * running with the fallbacked original backend.
  */
 export function validateProviderBackend(provider: CLIProxyProfileName): string | null {
-  const config = loadOrCreateUnifiedConfig();
-  const backend: CLIProxyBackend = config.cliproxy?.backend ?? DEFAULT_BACKEND;
-
   // Normalize provider to lowercase for case-insensitive comparison
   const normalizedProvider = provider.toLowerCase() as CLIProxyProvider;
+  const backend = getConfiguredBackend();
   if (backend === 'original' && PLUS_ONLY_PROVIDERS.includes(normalizedProvider)) {
-    return `${provider} requires CLIProxyAPIPlus. Set \`cliproxy.backend: plus\` in config.yaml or use --backend=plus`;
+    return getPlusBackendUnavailableMessage(provider);
   }
   return null;
 }

src/commands/cliproxy/index.ts

@@ -6,14 +6,13 @@
  */
 
 import { CLIProxyBackend } from '../../cliproxy/types';
-import { DEFAULT_BACKEND } from '../../cliproxy/platform-detector';
+import { getConfiguredBackend, resolveLocalBackend } from '../../cliproxy/binary-manager';
 import {
   type QuotaSupportedProvider,
   QUOTA_PROVIDER_HELP_TEXT,
   mapExternalProviderName,
   isQuotaSupportedProvider,
 } from '../../cliproxy/provider-capabilities';
-import { loadOrCreateUnifiedConfig } from '../../config/unified-config-loader';
 import { handleSync } from '../cliproxy-sync-handler';
 import { extractOption, hasAnyFlag } from '../arg-extractor';
 
@@ -74,9 +73,10 @@ function parseBackendArg(args: string[]): {
  * Get effective backend (CLI flag > config.yaml > default)
  */
 function getEffectiveBackend(cliBackend?: CLIProxyBackend): CLIProxyBackend {
-  if (cliBackend) return cliBackend;
-  const config = loadOrCreateUnifiedConfig();
-  return config.cliproxy?.backend ?? DEFAULT_BACKEND;
+  if (cliBackend) {
+    return resolveLocalBackend(cliBackend, { warnOnFallback: true });
+  }
+  return getConfiguredBackend({ warnOnFallback: true });
 }
 
 /**

src/commands/cliproxy/install-subcommand.ts

@@ -47,7 +47,7 @@ export async function showStatus(verbose: boolean, backend: CLIProxyBackend): Pr
     console.log(`  ${dim('Run "ccs gemini" or any provider to auto-install')}`);
   }
 
-  const latestCheck = await checkLatestVersion();
+  const latestCheck = await checkLatestVersion(backend);
   if (latestCheck.success && latestCheck.latestVersion) {
     console.log('');
     if (latestCheck.updateAvailable) {

src/config/unified-config-loader.ts

@@ -410,7 +410,7 @@ function mergeWithDefaults(partial: Partial<UnifiedConfig>): UnifiedConfig {
       backend:
         partial.cliproxy?.backend === 'original' || partial.cliproxy?.backend === 'plus'
           ? partial.cliproxy.backend
-          : undefined, // Invalid values become undefined (defaults to 'plus' at runtime)
+          : undefined, // Invalid values become undefined (defaults to 'original' at runtime)
       // Auto-sync - default to true
       auto_sync: partial.cliproxy?.auto_sync ?? defaults.cliproxy.auto_sync ?? true,
       routing: {

src/config/unified-config-types.ts

@@ -211,7 +211,7 @@ export interface CLIProxyRoutingConfig {
  * CLIProxy configuration section.
  */
 export interface CLIProxyConfig {
-  /** Backend selection: 'original' or 'plus' (default: 'plus') */
+  /** Backend selection: 'original' or 'plus' (default: 'original') */
   backend?: 'original' | 'plus';
   /** Nickname to email mapping for OAuth accounts */
   oauth_accounts: OAuthAccounts;

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

@@ -38,7 +38,11 @@ import {
 } from '../../cliproxy/config-generator';
 import { getProxyStatus as getProxyProcessStatus, stopProxy } from '../../cliproxy/session-tracker';
 import { ensureCliproxyService } from '../../cliproxy/service-manager';
-import { checkCliproxyUpdate, getInstalledCliproxyVersion } from '../../cliproxy/binary-manager';
+import {
+  checkCliproxyUpdate,
+  getConfiguredBackend,
+  getInstalledCliproxyVersion,
+} from '../../cliproxy/binary-manager';
 import {
   fetchAllVersions,
   isNewerVersion,
@@ -47,9 +51,7 @@ import {
 import {
   CLIPROXY_MAX_STABLE_VERSION,
   CLIPROXY_FAULTY_RANGE,
-  DEFAULT_BACKEND,
 } from '../../cliproxy/platform-detector';
-import { loadOrCreateUnifiedConfig } from '../../config/unified-config-loader';
 import { CLIPROXY_DEFAULT_PORT } from '../../cliproxy/config/port-manager';
 import {
   MODEL_ENV_VAR_KEYS,
@@ -143,16 +145,6 @@ export function shouldCacheQuotaResult(result: {
   return !transientPatterns.some((p) => msg.includes(p));
 }
 
-/** Get configured backend from config */
-function getConfiguredBackend() {
-  try {
-    const config = loadOrCreateUnifiedConfig();
-    return config.cliproxy?.backend || DEFAULT_BACKEND;
-  } catch {
-    return DEFAULT_BACKEND;
-  }
-}
-
 function buildUpdateCheckFallback(
   backend: ReturnType<typeof getConfiguredBackend>,
   getInstalledVersionFn: typeof getInstalledCliproxyVersion = getInstalledCliproxyVersion
@@ -409,7 +401,7 @@ router.post('/proxy-stop', async (_req: Request, res: Response): Promise<void> =
  */
 router.get('/update-check', async (_req: Request, res: Response): Promise<void> => {
   try {
-    const backend = getConfiguredBackend();
+    const backend = getConfiguredBackend({ warnOnFallback: true });
     const result = await resolveCliproxyUpdateCheckPayload(backend);
 
     res.json(result);
@@ -1019,7 +1011,7 @@ router.get('/quota/:provider/:accountId', async (req: Request, res: Response): P
  */
 router.get('/versions', async (_req: Request, res: Response): Promise<void> => {
   try {
-    const backend = getConfiguredBackend();
+    const backend = getConfiguredBackend({ warnOnFallback: true });
     res.json(await resolveCliproxyVersionsPayload(backend));
   } catch (error) {
     console.error(`[cliproxy-stats] ${(error as Error).message}`);
@@ -1073,7 +1065,7 @@ router.post('/install', async (req: Request, res: Response): Promise<void> => {
       return;
     }
 
-    const backend = getConfiguredBackend();
+    const backend = getConfiguredBackend({ warnOnFallback: true });
     const installResult = await installDashboardCliproxyVersion(version, backend);
 
     res.json({

src/web-server/services/cliproxy-dashboard-install-service.ts

@@ -1,4 +1,4 @@
-import { installCliproxyVersion } from '../../cliproxy/binary-manager';
+import { installCliproxyVersion, resolveLocalBackend } from '../../cliproxy/binary-manager';
 import { ensureCliproxyService, type ServiceStartResult } from '../../cliproxy/service-manager';
 import { getProxyStatus as getProxyProcessStatus } from '../../cliproxy/session-tracker';
 import { isCliproxyRunning } from '../../cliproxy/stats-fetcher';
@@ -52,12 +52,13 @@ export async function installDashboardCliproxyVersion(
   backend: CLIProxyBackend,
   deps: InstallDashboardCliproxyVersionDeps = defaultDeps
 ): Promise<DashboardCliproxyInstallResult> {
-  const backendLabel = backend === 'plus' ? 'CLIProxy Plus' : 'CLIProxy';
+  const effectiveBackend = resolveLocalBackend(backend, { warnOnFallback: true });
+  const backendLabel = effectiveBackend === 'plus' ? 'CLIProxy Plus' : 'CLIProxy';
   const shouldRestoreService = await wasProxyRunning(deps);
 
   // The installer owns the stop-and-replace lifecycle, including best-effort
   // shutdown for tracked and untracked proxies before swapping the binary.
-  await deps.installCliproxyVersion(version, true, backend);
+  await deps.installCliproxyVersion(version, true, effectiveBackend);
 
   if (!shouldRestoreService) {
     return {

tests/unit/cliproxy/binary-manager-install.test.ts

@@ -25,6 +25,54 @@ afterEach(() => {
 });
 
 describe('installCliproxyVersion', () => {
+  it('degrades explicit plus backend requests to original before install flows run', async () => {
+    let seenBackend: string | undefined;
+
+    const binaryManager = await import(
+      `../../../src/cliproxy/binary-manager?binary-manager-explicit-plus=${Date.now()}`
+    );
+
+    await binaryManager.installCliproxyVersion('6.7.1', false, 'plus', {
+      createManager: (_config: unknown, backend: string) => {
+        seenBackend = backend;
+        return {
+          isBinaryInstalled: () => false,
+          deleteBinary: () => undefined,
+          ensureBinary: async () => '/tmp/ccs-bin/original/cliproxy',
+        };
+      },
+      stopProxyFn: async () => ({ stopped: false, error: 'No active CLIProxy session found' }),
+      waitForPortFreeFn: async () => true,
+      formatInfo: (message: string) => message,
+      formatWarn: (message: string) => message,
+      getInstalledVersion: () => '6.6.80',
+    });
+
+    expect(seenBackend).toBe('original');
+  });
+
+  it('returns original and emits a real warning when plus backend is resolved locally', async () => {
+    const binaryManager = await import(
+      `../../../src/cliproxy/binary-manager?binary-manager-warning=${Date.now()}`
+    );
+
+    const writes: string[] = [];
+    const originalWrite = process.stderr.write.bind(process.stderr);
+    process.stderr.write = ((chunk: string | Uint8Array) => {
+      writes.push(typeof chunk === 'string' ? chunk : Buffer.from(chunk).toString('utf8'));
+      return true;
+    }) as typeof process.stderr.write;
+
+    try {
+      expect(binaryManager.resolveLocalBackend('plus', { warnOnFallback: true })).toBe('original');
+    } finally {
+      process.stderr.write = originalWrite;
+    }
+
+    expect(writes.join('')).toContain('CLIProxyAPIPlus upstream repo is currently unavailable');
+    expect(writes.join('')).toContain('backend: original');
+  });
+
   it('attempts to stop the proxy even when there is no tracked running session', async () => {
     const calls = {
       stopProxy: 0,

tests/unit/cliproxy/variant-update-service.test.ts

@@ -6,7 +6,10 @@ import * as fs from 'fs';
 import * as os from 'os';
 import * as path from 'path';
 import { afterEach, beforeEach, describe, expect, it } from 'bun:test';
-import { updateVariant } from '../../../src/cliproxy/services/variant-service';
+import {
+  updateVariant,
+  validateProviderBackend,
+} from '../../../src/cliproxy/services/variant-service';
 import { loadOrCreateUnifiedConfig } from '../../../src/config/unified-config-loader';
 
 describe('updateVariant - provider/model consistency', () => {
@@ -50,6 +53,7 @@ preferences:
   telemetry: false
   auto_update: true
 cliproxy:
+  backend: plus
   oauth_accounts: {}
   providers:
     - gemini
@@ -92,6 +96,12 @@ cliproxy:
     expect(result.error).toContain('denylist');
   });
 
+  it('reports plus-only providers as temporarily unavailable on local CLIProxy', () => {
+    const error = validateProviderBackend('ghcp');
+    expect(error).toContain('currently supports only `backend: original`');
+    expect(error).toContain('issues/1062');
+  });
+
   it('updates provider and regenerates provider-specific core env in same settings file', () => {
     const result = updateVariant('demo', {
       provider: 'codex',

tests/unit/web-server/cliproxy-dashboard-install-service.test.ts

@@ -56,7 +56,7 @@ describe('installDashboardCliproxyVersion', () => {
       success: true,
       restarted: true,
       port: 8317,
-      message: 'Successfully installed CLIProxy Plus v6.7.1 and restarted it on port 8317',
+      message: 'Successfully installed CLIProxy v6.7.1 and restarted it on port 8317',
     });
     expect(calls.isCliproxyRunning).toBe(0);
     expect(calls.installCliproxyVersion).toBe(1);
@@ -71,7 +71,7 @@ describe('installDashboardCliproxyVersion', () => {
     expect(result).toEqual<DashboardCliproxyInstallResult>({
       success: true,
       restarted: false,
-      message: 'Successfully installed CLIProxy Plus v6.7.1',
+      message: 'Successfully installed CLIProxy v6.7.1',
     });
     expect(calls.isCliproxyRunning).toBe(1);
     expect(calls.installCliproxyVersion).toBe(1);
@@ -118,8 +118,8 @@ describe('installDashboardCliproxyVersion', () => {
     expect(result).toEqual<DashboardCliproxyInstallResult>({
       success: false,
       restarted: false,
-      error: 'Installed CLIProxy Plus v6.7.1, but restart failed',
-      message: 'Installed CLIProxy Plus v6.7.1, but failed to restart it',
+      error: 'Installed CLIProxy v6.7.1, but restart failed',
+      message: 'Installed CLIProxy v6.7.1, but failed to restart it',
     });
   });
 });

tests/unit/web-server/cliproxy-stats-routes-install.test.ts

@@ -10,6 +10,7 @@ let createEmptyUnifiedConfig: typeof import('../../../src/config/unified-config-
 let saveUnifiedConfig: typeof import('../../../src/config/unified-config-loader').saveUnifiedConfig;
 let setGlobalConfigDir: typeof import('../../../src/utils/config-manager').setGlobalConfigDir;
 let writeInstalledVersion: typeof import('../../../src/cliproxy/binary/version-cache').writeInstalledVersion;
+let writeVersionCache: typeof import('../../../src/cliproxy/binary/version-cache').writeVersionCache;
 let writeVersionListCache: typeof import('../../../src/cliproxy/binary/version-cache').writeVersionListCache;
 
 let server: Server;
@@ -25,20 +26,21 @@ beforeAll(async () => {
   ({ setGlobalConfigDir } = await import('../../../src/utils/config-manager'));
   ({ createEmptyUnifiedConfig } = await import('../../../src/config/unified-config-types'));
   ({ saveUnifiedConfig } = await import('../../../src/config/unified-config-loader'));
-  ({ writeInstalledVersion, writeVersionListCache } = await import(
+  ({ writeInstalledVersion, writeVersionCache, writeVersionListCache } = await import(
     '../../../src/cliproxy/binary/version-cache'
   ));
 
   const ccsDir = path.join(tempHome, '.ccs');
-  const plusBinDir = path.join(ccsDir, 'cliproxy', 'bin', 'plus');
-  fs.mkdirSync(plusBinDir, { recursive: true });
+  const originalBinDir = path.join(ccsDir, 'cliproxy', 'bin', 'original');
+  fs.mkdirSync(originalBinDir, { recursive: true });
   setGlobalConfigDir(ccsDir);
 
   const config = createEmptyUnifiedConfig();
   config.cliproxy = { backend: 'plus' };
   saveUnifiedConfig(config);
 
-  writeInstalledVersion(plusBinDir, '6.6.80');
+  writeInstalledVersion(originalBinDir, '6.6.80');
+  writeVersionCache('6.6.89', 'original');
   writeVersionListCache(
     {
       versions: ['6.6.89', '6.6.88', '6.6.81', '6.6.80'],
@@ -46,7 +48,7 @@ beforeAll(async () => {
       latest: '6.6.89',
       checkedAt: Date.now(),
     },
-    'plus'
+    'original'
   );
 
   ({ default: cliproxyStatsRoutes } = await import(
@@ -94,6 +96,23 @@ afterAll(async () => {
 });
 
 describe('cliproxy-stats-routes install contract', () => {
+  it('routes saved plus configs through original backend for update checks', async () => {
+    const response = await fetch(`${baseUrl}/api/cliproxy/update-check`);
+    expect(response.status).toBe(200);
+
+    const body = (await response.json()) as {
+      backend: string;
+      backendLabel: string;
+      currentVersion: string;
+      latestVersion: string;
+    };
+
+    expect(body.backend).toBe('original');
+    expect(body.backendLabel).toBe('CLIProxy');
+    expect(body.currentVersion).toBe('6.6.80');
+    expect(body.latestVersion).toBe('6.6.89');
+  });
+
   it('returns faultyRange in the versions response', async () => {
     const response = await fetch(`${baseUrl}/api/cliproxy/versions`);
     expect(response.status).toBe(200);

ui/src/pages/settings/sections/proxy/index.tsx

@@ -191,7 +191,7 @@ export default function ProxySection() {
   }, [isAgyConfirmPhraseValid, persistAgyAckBypass, t]);
 
   // Backend state (loaded from API) + mutation hook for proper query invalidation
-  const [backend, setBackend] = useState<'original' | 'plus'>('plus');
+  const [backend, setBackend] = useState<'original' | 'plus'>('original');
   const [hasKiroGhcpVariants, setHasKiroGhcpVariants] = useState(false);
   const updateBackendMutation = useUpdateBackend();
   const { data: proxyStatus } = useProxyStatus();
@@ -490,9 +490,6 @@ export default function ProxySection() {
               >
                 <div className="flex items-center gap-3 mb-2">
                   <span className="font-medium">{t('settingsProxy.backendPlusApi')}</span>
-                  <span className="text-xs px-1.5 py-0.5 rounded bg-green-100 text-green-700 dark:bg-green-900/50 dark:text-green-400">
-                    {t('settingsProxy.default')}
-                  </span>
                 </div>
                 <p className="text-xs text-muted-foreground">{t('settingsProxy.plusDesc')}</p>
               </button>
@@ -509,10 +506,22 @@ export default function ProxySection() {
               >
                 <div className="flex items-center gap-3 mb-2">
                   <span className="font-medium">{t('settingsProxy.backendApi')}</span>
+                  <span className="text-xs px-1.5 py-0.5 rounded bg-green-100 text-green-700 dark:bg-green-900/50 dark:text-green-400">
+                    {t('settingsProxy.default')}
+                  </span>
                 </div>
                 <p className="text-xs text-muted-foreground">{t('settingsProxy.originalDesc')}</p>
               </button>
             </div>
+            {backend === 'plus' && (
+              <Alert className="py-2 border-amber-200 bg-amber-50 dark:border-amber-900/50 dark:bg-amber-900/20 [&>svg]:top-2.5">
+                <AlertTriangle className="h-4 w-4 text-amber-600" />
+                <AlertDescription className="text-amber-700 dark:text-amber-400">
+                  CLIProxyAPIPlus upstream is currently unavailable. Local CLIProxy will use the
+                  original backend until issue #1062 is resolved.
+                </AlertDescription>
+              </Alert>
+            )}
             {/* Warning when original backend selected with Kiro/ghcp variants */}
             {backend === 'original' && hasKiroGhcpVariants && (
               <Alert variant="destructive" className="py-2">