diff --git a/web/src/pages/agent/form/begin-form/index.tsx b/web/src/pages/agent/form/begin-form/index.tsx
index 97494d87c..db16a780f 100644
--- a/web/src/pages/agent/form/begin-form/index.tsx
+++ b/web/src/pages/agent/form/begin-form/index.tsx
@@ -15,7 +15,7 @@ import { FormTooltip } from '@/components/ui/tooltip';
 import { buildSelectOptions } from '@/utils/component-util';
 import { zodResolver } from '@hookform/resolvers/zod';
 import { Plus } from 'lucide-react';
-import { memo } from 'react';
+import { memo, useEffect, useRef } from 'react';
 import { useForm, useWatch } from 'react-hook-form';
 import { useTranslation } from 'react-i18next';
 import { z } from 'zod';
@@ -70,6 +70,18 @@ function BeginForm({ node }: INextOperatorForm) {
     name: 'enablePrologue',
   });
 
+  const previousModeRef = useRef(mode);
+
+  useEffect(() => {
+    if (
+      previousModeRef.current === AgentDialogueMode.Task &&
+      mode === AgentDialogueMode.Conversational
+    ) {
+      form.setValue('enablePrologue', true);
+    }
+    previousModeRef.current = mode;
+  }, [mode, form]);
+
   const {
     ok,
     currentRecord,