fix(config): disable JIT context loading by default (#24364)

Author: SandyTao520

docs/reference/configuration.md

@@ -1600,7 +1600,7 @@ their corresponding top-level category object in your `settings.json` file.
 
 - **`experimental.jitContext`** (boolean):
   - **Description:** Enable Just-In-Time (JIT) context loading.
-  - **Default:** `true`
+  - **Default:** `false`
   - **Requires restart:** Yes
 
 - **`experimental.useOSC52Paste`** (boolean):

packages/cli/src/config/settingsSchema.ts

@@ -1998,7 +1998,7 @@ const SETTINGS_SCHEMA = {
         label: 'JIT Context Loading',
         category: 'Experimental',
         requiresRestart: true,
-        default: true,
+        default: false,
         description: 'Enable Just-In-Time (JIT) context loading.',
         showInDialog: false,
       },

packages/cli/src/ui/components/Footer.test.tsx

@@ -434,6 +434,7 @@ describe('<Footer />', () => {
 
     it('renders footer with all optional sections hidden (minimal footer)', async () => {
       const { lastFrame, unmount } = await renderWithProviders(<Footer />, {
+        config: mockConfig,
         width: 120,
         uiState: { sessionStats: mockSessionStats },
         settings: createMockSettings({
@@ -551,6 +552,7 @@ describe('<Footer />', () => {
   describe('Footer Token Formatting', () => {
     const renderWithTokens = async (tokens: number) => {
       const result = await renderWithProviders(<Footer />, {
+        config: mockConfig,
         width: 120,
         uiState: {
           sessionStats: {
@@ -734,6 +736,7 @@ describe('<Footer />', () => {
 
     it('handles empty items array', async () => {
       const { lastFrame, unmount } = await renderWithProviders(<Footer />, {
+        config: mockConfig,
         width: 120,
         uiState: { sessionStats: mockSessionStats },
         settings: createMockSettings({

packages/core/src/config/config.ts

@@ -1087,7 +1087,7 @@ export class Config implements McpContext, AgentLoopContext {
       modelConfigServiceConfig ?? DEFAULT_MODEL_CONFIGS,
     );
 
-    this.experimentalJitContext = params.experimentalJitContext ?? true;
+    this.experimentalJitContext = params.experimentalJitContext ?? false;
     this.experimentalMemoryManager = params.experimentalMemoryManager ?? false;
     this.topicUpdateNarration = params.topicUpdateNarration ?? false;
     this.modelSteering = params.modelSteering ?? false;

schemas/settings.schema.json

@@ -2777,8 +2777,8 @@
         "jitContext": {
           "title": "JIT Context Loading",
           "description": "Enable Just-In-Time (JIT) context loading.",
-          "markdownDescription": "Enable Just-In-Time (JIT) context loading.\n\n- Category: `Experimental`\n- Requires restart: `yes`\n- Default: `true`",
-          "default": true,
+          "markdownDescription": "Enable Just-In-Time (JIT) context loading.\n\n- Category: `Experimental`\n- Requires restart: `yes`\n- Default: `false`",
+          "default": false,
           "type": "boolean"
         },
         "useOSC52Paste": {