diff --git a/src/renderer/components/ScriptsView/ScriptsView.tsx b/src/renderer/components/ScriptsView/ScriptsView.tsx
index c0e0a01..996be30 100644
--- a/src/renderer/components/ScriptsView/ScriptsView.tsx
+++ b/src/renderer/components/ScriptsView/ScriptsView.tsx
@@ -60,6 +60,9 @@ export const ScriptsView: React.FC<ScriptsViewProps> = ({ scriptId }) => {
   const [isCheckingSyntax, setIsCheckingSyntax] = useState(false);
   const editorRef = useRef<ScriptMonacoEditor | null>(null);
   const monacoRef = useRef<ScriptMonacoRuntime | null>(null);
+  // Token incremented to signal Monaco to remount with fresh defaultValue.
+  // Prevents controlled-mode cursor jumps during typing.
+  const [monacoResetToken, setMonacoResetToken] = useState(0);
 
   const buildCacheKey = (scriptMeta: Pick<ScriptData, 'id' | 'version'>, content: string): string => {
     let hash = 0;
@@ -203,6 +206,7 @@ export const ScriptsView: React.FC<ScriptsViewProps> = ({ scriptId }) => {
         setAvailableEntrypoints(['main']);
         setEnabled(true);
         setScriptContent('');
+        setMonacoResetToken(prev => prev + 1);
         setIsSlugManuallyEdited(false);
         return;
       }
@@ -217,6 +221,7 @@ export const ScriptsView: React.FC<ScriptsViewProps> = ({ scriptId }) => {
         setAvailableEntrypoints(['main']);
         setEnabled(true);
         setScriptContent('');
+        setMonacoResetToken(prev => prev + 1);
         setIsSlugManuallyEdited(false);
         return;
       }
@@ -228,6 +233,7 @@ export const ScriptsView: React.FC<ScriptsViewProps> = ({ scriptId }) => {
       setEntrypoint(item.entrypoint || 'render');
       setEnabled(item.enabled ?? true);
       setScriptContent(item.content || '');
+      setMonacoResetToken(prev => prev + 1);
       const normalizedExisting = toFunctionSlug(item.slug || item.title || '');
       setIsSlugManuallyEdited(normalizedExisting !== toFunctionSlug(item.title || ''));
       await refreshEntrypoints(item.content || '', item);
@@ -520,10 +526,11 @@ export const ScriptsView: React.FC<ScriptsViewProps> = ({ scriptId }) => {
 
         <div className="scripts-monaco">
           <MonacoEditor
+            key={monacoResetToken}
             height="100%"
             language="python"
             theme="vs-dark"
-            value={scriptContent}
+            defaultValue={scriptContent}
             onChange={(value) => setScriptContent(value || '')}
             onMount={handleEditorDidMount}
             options={{
diff --git a/tests/renderer/components/ScriptsView.test.tsx b/tests/renderer/components/ScriptsView.test.tsx
index 100879d..a4f440a 100644
--- a/tests/renderer/components/ScriptsView.test.tsx
+++ b/tests/renderer/components/ScriptsView.test.tsx
@@ -13,6 +13,7 @@ const setModelMarkersMock = vi.fn();
 vi.mock('@monaco-editor/react', () => ({
   default: (props: {
     value?: string;
+    defaultValue?: string;
     onChange?: (value?: string) => void;
     language?: string;
     onMount?: (editor: unknown, monaco: unknown) => void;
@@ -34,7 +35,7 @@ vi.mock('@monaco-editor/react', () => ({
     return (
       <textarea
         aria-label="Script Content"
-        value={props.value || ''}
+        defaultValue={props.defaultValue ?? props.value ?? ''}
         onChange={(event) => props.onChange?.(event.target.value)}
       />
     );
@@ -91,11 +92,13 @@ describe('ScriptsView', () => {
   it('loads scripts and allows editing content', async () => {
     render(<ScriptsView scriptId="script-1" />);
 
-    const textarea = screen.getByLabelText('Script Content') as HTMLTextAreaElement;
+    // After script loads, Monaco remounts with new key — re-query the textarea
     await vi.waitFor(() => {
+      const textarea = screen.getByLabelText('Script Content') as HTMLTextAreaElement;
       expect(textarea.value).toContain('print("hello")');
     });
 
+    const textarea = screen.getByLabelText('Script Content') as HTMLTextAreaElement;
     fireEvent.change(textarea, { target: { value: 'print("updated")' } });
     expect(textarea.value).toContain('updated');