diff --git a/packages/cli/src/config/extensions/extensionEnablement.test.ts b/packages/cli/src/config/extensions/extensionEnablement.test.ts
index 8923f6e023..63a38ca5e8 100644
--- a/packages/cli/src/config/extensions/extensionEnablement.test.ts
+++ b/packages/cli/src/config/extensions/extensionEnablement.test.ts
@@ -9,6 +9,7 @@ import fs from 'node:fs';
 import os from 'node:os';
 import { afterEach, beforeEach, describe, expect, it } from 'vitest';
 import { ExtensionEnablementManager, Override } from './extensionEnablement.js';
+import type { Extension } from '../extension.js';
 
 // Helper to create a temporary directory for testing
 function createTestDir() {
@@ -225,6 +226,63 @@ describe('ExtensionEnablementManager', () => {
       true,
     );
   });
+
+  describe('validateExtensionOverrides', () => {
+    let consoleErrorSpy: ReturnType<typeof vi.spyOn>;
+
+    beforeEach(() => {
+      consoleErrorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
+    });
+
+    afterEach(() => {
+      consoleErrorSpy.mockRestore();
+    });
+
+    it('should not log an error if enabledExtensionNamesOverride is empty', () => {
+      const manager = new ExtensionEnablementManager(configDir, []);
+      manager.validateExtensionOverrides([]);
+      expect(consoleErrorSpy).not.toHaveBeenCalled();
+    });
+
+    it('should not log an error if all enabledExtensionNamesOverride are valid', () => {
+      const manager = new ExtensionEnablementManager(configDir, [
+        'ext-one',
+        'ext-two',
+      ]);
+      const extensions = [
+        { config: { name: 'ext-one' } },
+        { config: { name: 'ext-two' } },
+      ] as Extension[];
+      manager.validateExtensionOverrides(extensions);
+      expect(consoleErrorSpy).not.toHaveBeenCalled();
+    });
+
+    it('should log an error for each invalid extension name in enabledExtensionNamesOverride', () => {
+      const manager = new ExtensionEnablementManager(configDir, [
+        'ext-one',
+        'ext-invalid',
+        'ext-another-invalid',
+      ]);
+      const extensions = [
+        { config: { name: 'ext-one' } },
+        { config: { name: 'ext-two' } },
+      ] as Extension[];
+      manager.validateExtensionOverrides(extensions);
+      expect(consoleErrorSpy).toHaveBeenCalledTimes(2);
+      expect(consoleErrorSpy).toHaveBeenCalledWith(
+        'Extension not found: ext-invalid',
+      );
+      expect(consoleErrorSpy).toHaveBeenCalledWith(
+        'Extension not found: ext-another-invalid',
+      );
+    });
+
+    it('should not log an error if "none" is in enabledExtensionNamesOverride', () => {
+      const manager = new ExtensionEnablementManager(configDir, ['none']);
+      manager.validateExtensionOverrides([]);
+      expect(consoleErrorSpy).not.toHaveBeenCalled();
+    });
+  });
 });
 
 describe('Override', () => {
diff --git a/packages/cli/src/config/extensions/extensionEnablement.ts b/packages/cli/src/config/extensions/extensionEnablement.ts
index 79ce5ac2d6..c1e45101c2 100644
--- a/packages/cli/src/config/extensions/extensionEnablement.ts
+++ b/packages/cli/src/config/extensions/extensionEnablement.ts
@@ -121,6 +121,7 @@ export class ExtensionEnablementManager {
 
   validateExtensionOverrides(extensions: Extension[]) {
     for (const name of this.enabledExtensionNamesOverride) {
+      if (name === 'none') continue;
       if (
         !extensions.some(
           (ext) => ext.config.name.toLowerCase() === name.toLowerCase(),