diff --git a/docs/get-started/configuration.md b/docs/get-started/configuration.md
index 3c8d0a76d8..d845c33692 100644
--- a/docs/get-started/configuration.md
+++ b/docs/get-started/configuration.md
@@ -830,6 +830,11 @@ their corresponding top-level category object in your `settings.json` file.
   - **Default:** `true`
   - **Requires restart:** Yes
 
+- **`experimental.extensionConfig`** (boolean):
+  - **Description:** Enable requesting and fetching of extension settings.
+  - **Default:** `false`
+  - **Requires restart:** Yes
+
 - **`experimental.extensionReloading`** (boolean):
   - **Description:** Enables extension loading/unloading within the CLI session.
   - **Default:** `false`
diff --git a/packages/cli/src/commands/extensions/configure.ts b/packages/cli/src/commands/extensions/configure.ts
index 4ea3299610..7d16179cc0 100644
--- a/packages/cli/src/commands/extensions/configure.ts
+++ b/packages/cli/src/commands/extensions/configure.ts
@@ -12,7 +12,8 @@ import {
   getScopedEnvContents,
 } from '../../config/extensions/extensionSettings.js';
 import { getExtensionAndManager, getExtensionManager } from './utils.js';
-import { debugLogger } from '@google/gemini-cli-core';
+import { loadSettings } from '../../config/settings.js';
+import { debugLogger, coreEvents } from '@google/gemini-cli-core';
 import { exitCli } from '../utils.js';
 import prompts from 'prompts';
 import type { ExtensionConfig } from '../../config/extension.js';
@@ -43,6 +44,16 @@ export const configureCommand: CommandModule<object, ConfigureArgs> = {
       }),
   handler: async (args) => {
     const { name, setting, scope } = args;
+    const settings = loadSettings(process.cwd()).merged;
+
+    if (!(settings.experimental?.extensionConfig ?? true)) {
+      coreEvents.emitFeedback(
+        'error',
+        'Extension configuration is currently disabled. Enable it by setting "experimental.extensionConfig" to true.',
+      );
+      await exitCli();
+      return;
+    }
 
     if (name) {
       if (name.includes('/') || name.includes('\\') || name.includes('..')) {
diff --git a/packages/cli/src/config/extension-manager-scope.test.ts b/packages/cli/src/config/extension-manager-scope.test.ts
index a9e0738c87..6d3e51b4d8 100644
--- a/packages/cli/src/config/extension-manager-scope.test.ts
+++ b/packages/cli/src/config/extension-manager-scope.test.ts
@@ -109,6 +109,9 @@ describe('ExtensionManager Settings Scope', () => {
         telemetry: {
           enabled: false,
         },
+        experimental: {
+          extensionConfig: true,
+        },
       } as Settings,
     });
 
@@ -148,6 +151,9 @@ describe('ExtensionManager Settings Scope', () => {
         telemetry: {
           enabled: false,
         },
+        experimental: {
+          extensionConfig: true,
+        },
       } as Settings,
     });
 
@@ -185,6 +191,9 @@ describe('ExtensionManager Settings Scope', () => {
         telemetry: {
           enabled: false,
         },
+        experimental: {
+          extensionConfig: true,
+        },
       } as Settings,
     });
 
diff --git a/packages/cli/src/config/extension-manager.ts b/packages/cli/src/config/extension-manager.ts
index fafa801bf2..75416f1909 100644
--- a/packages/cli/src/config/extension-manager.ts
+++ b/packages/cli/src/config/extension-manager.ts
@@ -287,7 +287,10 @@ Would you like to attempt to install via "git clone" instead?`,
         }
 
         await fs.promises.mkdir(destinationPath, { recursive: true });
-        if (this.requestSetting) {
+        if (
+          this.requestSetting &&
+          (this.settings.experimental?.extensionConfig ?? false)
+        ) {
           if (isUpdate) {
             await maybePromptForSettings(
               newExtensionConfig,
@@ -305,11 +308,14 @@ Would you like to attempt to install via "git clone" instead?`,
           }
         }
 
-        const missingSettings = await getMissingSettings(
-          newExtensionConfig,
-          extensionId,
-          this.workspaceDir,
-        );
+        const missingSettings =
+          (this.settings.experimental?.extensionConfig ?? false)
+            ? await getMissingSettings(
+                newExtensionConfig,
+                extensionId,
+                this.workspaceDir,
+              )
+            : [];
         if (missingSettings.length > 0) {
           const message = `Extension "${newExtensionConfig.name}" has missing settings: ${missingSettings
             .map((s) => s.name)
@@ -526,23 +532,31 @@ Would you like to attempt to install via "git clone" instead?`,
 
       const extensionId = getExtensionId(config, installMetadata);
 
-      const userSettings = await getScopedEnvContents(
-        config,
-        extensionId,
-        ExtensionSettingScope.USER,
-      );
-      const workspaceSettings = await getScopedEnvContents(
-        config,
-        extensionId,
-        ExtensionSettingScope.WORKSPACE,
-        this.workspaceDir,
-      );
+      let userSettings: Record<string, string> = {};
+      let workspaceSettings: Record<string, string> = {};
+
+      if (this.settings.experimental?.extensionConfig ?? false) {
+        userSettings = await getScopedEnvContents(
+          config,
+          extensionId,
+          ExtensionSettingScope.USER,
+        );
+        workspaceSettings = await getScopedEnvContents(
+          config,
+          extensionId,
+          ExtensionSettingScope.WORKSPACE,
+          this.workspaceDir,
+        );
+      }
 
       const customEnv = { ...userSettings, ...workspaceSettings };
       config = resolveEnvVarsInObject(config, customEnv);
 
       const resolvedSettings: ResolvedExtensionSetting[] = [];
-      if (config.settings) {
+      if (
+        config.settings &&
+        (this.settings.experimental?.extensionConfig ?? false)
+      ) {
         for (const setting of config.settings) {
           const value = customEnv[setting.envVar];
           let scope: 'user' | 'workspace' | undefined;
diff --git a/packages/cli/src/config/extension.test.ts b/packages/cli/src/config/extension.test.ts
index d1999d60c8..6619befc66 100644
--- a/packages/cli/src/config/extension.test.ts
+++ b/packages/cli/src/config/extension.test.ts
@@ -200,11 +200,13 @@ describe('extension tests', () => {
       source: undefined,
     });
     vi.spyOn(process, 'cwd').mockReturnValue(tempWorkspaceDir);
+    const settings = loadSettings(tempWorkspaceDir).merged;
+    (settings.experimental ??= {}).extensionConfig = true;
     extensionManager = new ExtensionManager({
       workspaceDir: tempWorkspaceDir,
       requestConsent: mockRequestConsent,
       requestSetting: mockPromptForSettings,
-      settings: loadSettings(tempWorkspaceDir).merged,
+      settings,
     });
     resetTrustedFoldersForTesting();
   });
diff --git a/packages/cli/src/config/extensions/extensionUpdates.test.ts b/packages/cli/src/config/extensions/extensionUpdates.test.ts
index 1e30e0b898..a9240a1676 100644
--- a/packages/cli/src/config/extensions/extensionUpdates.test.ts
+++ b/packages/cli/src/config/extensions/extensionUpdates.test.ts
@@ -11,6 +11,7 @@ import * as fs from 'node:fs';
 import { getMissingSettings } from './extensionSettings.js';
 import type { ExtensionConfig } from '../extension.js';
 import { ExtensionStorage } from './storage.js';
+import type { Settings } from '../settings.js';
 import {
   KeychainTokenStorage,
   debugLogger,
@@ -245,8 +246,13 @@ describe('extensionUpdates', () => {
 
       const manager = new ExtensionManager({
         workspaceDir: tempWorkspaceDir,
-        // eslint-disable-next-line @typescript-eslint/no-explicit-any
-        settings: { telemetry: {} } as any,
+
+        settings: {
+          telemetry: {
+            enabled: false,
+          },
+          experimental: { extensionConfig: true },
+        } as unknown as Settings,
         requestConsent: vi.fn().mockResolvedValue(true),
         requestSetting: null, // Simulate non-interactive
       });
diff --git a/packages/cli/src/config/settingsSchema.ts b/packages/cli/src/config/settingsSchema.ts
index 424f2e1906..229eebf81d 100644
--- a/packages/cli/src/config/settingsSchema.ts
+++ b/packages/cli/src/config/settingsSchema.ts
@@ -1413,6 +1413,15 @@ const SETTINGS_SCHEMA = {
         description: 'Enable extension management features.',
         showInDialog: false,
       },
+      extensionConfig: {
+        type: 'boolean',
+        label: 'Extension Configuration',
+        category: 'Experimental',
+        requiresRestart: true,
+        default: false,
+        description: 'Enable requesting and fetching of extension settings.',
+        showInDialog: false,
+      },
       extensionReloading: {
         type: 'boolean',
         label: 'Extension Reloading',
diff --git a/schemas/settings.schema.json b/schemas/settings.schema.json
index 1e3e1f0923..a976c19fd6 100644
--- a/schemas/settings.schema.json
+++ b/schemas/settings.schema.json
@@ -1393,6 +1393,13 @@
           "default": true,
           "type": "boolean"
         },
+        "extensionConfig": {
+          "title": "Extension Configuration",
+          "description": "Enable requesting and fetching of extension settings.",
+          "markdownDescription": "Enable requesting and fetching of extension settings.\n\n- Category: `Experimental`\n- Requires restart: `yes`\n- Default: `false`",
+          "default": false,
+          "type": "boolean"
+        },
         "extensionReloading": {
           "title": "Extension Reloading",
           "description": "Enables extension loading/unloading within the CLI session.",