diff --git a/studio-app/src/StoryChat.jsx b/studio-app/src/StoryChat.jsx
index a3fb2cc..88e9ca3 100644
--- a/studio-app/src/StoryChat.jsx
+++ b/studio-app/src/StoryChat.jsx
@@ -41,6 +41,9 @@ import {
 import { createPreviewChat } from './story-chat-preview.js';
 import { createLiveChat } from './story-chat-client.js';
 import { ACCEPT } from './story-chat-attach.js';
+
+const MAX_MESSAGE_CHARS = 4000,
+  MAX_SCRIPT_CHARS = 20000;
 import { AttachedFiles, PendingFiles, useAttachments } from './StoryChatAttachments.jsx';
 import { createCloudClient } from './cloud-client.js';
 import { agentLinkSearch } from './agent-navigation.js';
@@ -559,7 +562,12 @@ export default function StoryChat({ account, mode = 'preview', projectId = null
   };
   const [fresh, setFresh] = useState([]);
   const [notice, setNotice] = useState('');
-  const attachments = useAttachments({ live, maxChars: 4000, setText, onNotice: setNotice });
+  const attachments = useAttachments({
+    live,
+    maxChars: MAX_SCRIPT_CHARS,
+    setText,
+    onNotice: setNotice,
+  });
   const files = attachments.files;
   const chat = useRef(null);
   const thread = useRef(null);
@@ -679,7 +687,13 @@ export default function StoryChat({ account, mode = 'preview', projectId = null
   const send = (value = text) => {
     const message = value.trim();
     if ((!message && !files.length) || state.busy || unavailable) return;
-    chat.current.send({ text: message, attachments: files }, emit);
+    if (message.length > MAX_SCRIPT_CHARS) {
+      setNotice(t('storyChat.textCut', { max: MAX_SCRIPT_CHARS }));
+      return;
+    }
+    // A long message is a script: it gets its own limit, and shots to check before anything is made.
+    const script = message.length > MAX_MESSAGE_CHARS;
+    chat.current.send({ text: message, attachments: files, script }, emit);
     track('story_chat_message', { live, attachments: files.length });
     setText('');
     attachments.clear();
@@ -848,6 +862,7 @@ export default function StoryChat({ account, mode = 'preview', projectId = null
               <div className="sc-welcome">
                 <h1>{t('storyChat.welcome')}</h1>
                 <p>{t('storyChat.welcomeHelp')}</p>
+                <p className="muted">{t('storyChat.scriptHelp')}</p>
                 <div className="sc-starters">
                   {starters.map(({ key, picture }) => (
                     <Button
diff --git a/studio-app/src/i18n/storyChatCatalogs.js b/studio-app/src/i18n/storyChatCatalogs.js
index eb85fe5..5ccb109 100644
--- a/studio-app/src/i18n/storyChatCatalogs.js
+++ b/studio-app/src/i18n/storyChatCatalogs.js
@@ -59,6 +59,8 @@ export const storyChatCatalogs = {
     'storyChat.starter3': 'A bedtime story about a fox who can’t sleep',
     'storyChat.placeholder': 'Describe your story, or ask for a change…',
     'storyChat.attach': 'Add files',
+    'storyChat.scriptHelp':
+      'Have a script? Paste it below or drop in a text file, and you can check the shots first.',
     'storyChat.attachTo': 'Where {name} goes',
     'storyChat.attachLibrary': 'Story library',
     'storyChat.uploadPhoto': 'Upload photo',
@@ -190,6 +192,7 @@ export const storyChatCatalogs = {
     'storyChat.starter3': '一个睡不着的小狐狸的睡前故事',
     'storyChat.placeholder': '说说你的故事，或者告诉我要改什么…',
     'storyChat.attach': '添加文件',
+    'storyChat.scriptHelp': '已有剧本？粘贴到下面或拖入文本文件，可以先检查镜头。',
     'storyChat.attachTo': '{name} 放到哪里',
     'storyChat.attachLibrary': '故事素材库',
     'storyChat.uploadPhoto': '上传照片',
diff --git a/studio-app/src/story-chat-client.js b/studio-app/src/story-chat-client.js
index 99d7a6e..c4671e9 100644
--- a/studio-app/src/story-chat-client.js
+++ b/studio-app/src/story-chat-client.js
@@ -236,7 +236,7 @@ export function createLiveChat({
         load(await api.request(path + '/open', { method: 'POST', body: { language } }), emit);
       }
     },
-    async send({ text, attachments = [] }, emit) {
+    async send({ text, attachments = [], script = false }, emit) {
       const id = turnId();
       emit({ type: 'user.message', id: id + '-u', text, attachments });
       emit({ type: 'turn.started' });
@@ -246,7 +246,11 @@ export function createLiveChat({
         const note = attachmentNote(added, labels.t);
         const value = await api.request(`/v1/story-chats/${encodeURIComponent(ident)}/turns`, {
           method: 'POST',
-          body: { turn_id: id, text: [text, note].filter(Boolean).join('\n\n') },
+          body: {
+            turn_id: id,
+            text: [text, note].filter(Boolean).join('\n\n'),
+            ...(script ? { script: true } : {}),
+          },
           // A model turn can take 10–30 s; never give up before the server does.
           timeoutMs: 120000,
         });