diff --git a/packages/core/src/qwen/qwenOAuth2.test.ts b/packages/core/src/qwen/qwenOAuth2.test.ts
index 6596e12d3..920ca85e3 100644
--- a/packages/core/src/qwen/qwenOAuth2.test.ts
+++ b/packages/core/src/qwen/qwenOAuth2.test.ts
@@ -751,6 +751,7 @@ describe('getQwenOAuthClient', () => {
   beforeEach(() => {
     mockConfig = {
       isBrowserLaunchSuppressed: vi.fn().mockReturnValue(false),
+      isInteractive: vi.fn().mockReturnValue(true),
     } as unknown as Config;
 
     originalFetch = global.fetch;
@@ -839,9 +840,7 @@ describe('getQwenOAuthClient', () => {
           requireCachedCredentials: true,
         }),
       ),
-    ).rejects.toThrow(
-      'No cached Qwen-OAuth credentials found. Please re-authenticate.',
-    );
+    ).rejects.toThrow('Please use /auth to re-authenticate.');
 
     expect(global.fetch).not.toHaveBeenCalled();
 
@@ -1007,6 +1006,7 @@ describe('getQwenOAuthClient - Enhanced Error Scenarios', () => {
   beforeEach(() => {
     mockConfig = {
       isBrowserLaunchSuppressed: vi.fn().mockReturnValue(false),
+      isInteractive: vi.fn().mockReturnValue(true),
     } as unknown as Config;
 
     originalFetch = global.fetch;
@@ -1202,6 +1202,7 @@ describe('authWithQwenDeviceFlow - Comprehensive Testing', () => {
   beforeEach(() => {
     mockConfig = {
       isBrowserLaunchSuppressed: vi.fn().mockReturnValue(false),
+      isInteractive: vi.fn().mockReturnValue(true),
     } as unknown as Config;
 
     originalFetch = global.fetch;
@@ -1405,6 +1406,7 @@ describe('Browser Launch and Error Handling', () => {
   beforeEach(() => {
     mockConfig = {
       isBrowserLaunchSuppressed: vi.fn().mockReturnValue(false),
+      isInteractive: vi.fn().mockReturnValue(true),
     } as unknown as Config;
 
     originalFetch = global.fetch;
@@ -2043,6 +2045,7 @@ describe('SharedTokenManager Integration in QwenOAuth2Client', () => {
   it('should handle TokenManagerError types correctly in getQwenOAuthClient', async () => {
     const mockConfig = {
       isBrowserLaunchSuppressed: vi.fn().mockReturnValue(true),
+      isInteractive: vi.fn().mockReturnValue(true),
     } as unknown as Config;
 
     // Test different TokenManagerError types
diff --git a/packages/core/src/qwen/qwenOAuth2.ts b/packages/core/src/qwen/qwenOAuth2.ts
index ab89cdfcf..b18c0319d 100644
--- a/packages/core/src/qwen/qwenOAuth2.ts
+++ b/packages/core/src/qwen/qwenOAuth2.ts
@@ -516,9 +516,7 @@ export async function getQwenOAuthClient(
     }
 
     if (options?.requireCachedCredentials) {
-      throw new Error(
-        'No cached Qwen-OAuth credentials found. Please re-authenticate.',
-      );
+      throw new Error('Please use /auth to re-authenticate.');
     }
 
     // If we couldn't obtain valid credentials via SharedTokenManager, fall back to
@@ -740,11 +738,9 @@ async function authWithQwenDeviceFlow(
     // Emit device authorization event for UI integration immediately
     qwenOAuth2Events.emit(QwenOAuth2Event.AuthUri, deviceAuth);
 
-    // Always show the fallback message in non-interactive environments to ensure
-    // users can see the authorization URL even if browser launching is attempted.
-    // This is critical for headless/remote environments where browser launching
-    // may silently fail without throwing an error.
-    showFallbackMessage(deviceAuth.verification_uri_complete);
+    if (config.isBrowserLaunchSuppressed() || !config.isInteractive()) {
+      showFallbackMessage(deviceAuth.verification_uri_complete);
+    }
 
     // Try to open browser if not suppressed
     if (!config.isBrowserLaunchSuppressed()) {