bug(cli): Prefer IPv4 dns resolution by default. (#5338)

packages/cli/src/config/settings.test.ts

@@ -777,6 +777,48 @@ describe('Settings Loading and Merging', () => {
       }
     });
 
+    it('should correctly merge dnsResolutionOrder with workspace taking precedence', () => {
+      (mockFsExistsSync as Mock).mockReturnValue(true);
+      const userSettingsContent = {
+        dnsResolutionOrder: 'ipv4first',
+      };
+      const workspaceSettingsContent = {
+        dnsResolutionOrder: 'verbatim',
+      };
+
+      (fs.readFileSync as Mock).mockImplementation(
+        (p: fs.PathOrFileDescriptor) => {
+          if (p === USER_SETTINGS_PATH)
+            return JSON.stringify(userSettingsContent);
+          if (p === MOCK_WORKSPACE_SETTINGS_PATH)
+            return JSON.stringify(workspaceSettingsContent);
+          return '{}';
+        },
+      );
+
+      const settings = loadSettings(MOCK_WORKSPACE_DIR);
+      expect(settings.merged.dnsResolutionOrder).toBe('verbatim');
+    });
+
+    it('should use user dnsResolutionOrder if workspace is not defined', () => {
+      (mockFsExistsSync as Mock).mockImplementation(
+        (p: fs.PathLike) => p === USER_SETTINGS_PATH,
+      );
+      const userSettingsContent = {
+        dnsResolutionOrder: 'verbatim',
+      };
+      (fs.readFileSync as Mock).mockImplementation(
+        (p: fs.PathOrFileDescriptor) => {
+          if (p === USER_SETTINGS_PATH)
+            return JSON.stringify(userSettingsContent);
+          return '{}';
+        },
+      );
+
+      const settings = loadSettings(MOCK_WORKSPACE_DIR);
+      expect(settings.merged.dnsResolutionOrder).toBe('verbatim');
+    });
+
     it('should leave unresolved environment variables as is', () => {
       const userSettingsContent = { apiKey: '$UNDEFINED_VAR' };
       (mockFsExistsSync as Mock).mockImplementation(

packages/cli/src/config/settings.ts

@@ -38,6 +38,8 @@ export function getSystemSettingsPath(): string {
   }
 }
 
+export type DnsResolutionOrder = 'ipv4first' | 'verbatim';
+
 export enum SettingScope {
   User = 'User',
   Workspace = 'Workspace',
@@ -110,6 +112,7 @@ export interface Settings {
   disableAutoUpdate?: boolean;
 
   memoryDiscoveryMaxDirs?: number;
+  dnsResolutionOrder?: DnsResolutionOrder;
 }
 
 export interface SettingsError {