diff --git a/src/pages/views/workspace/ChatStream.tsx b/src/pages/views/workspace/ChatStream.tsx
index 1146aab..c8295c1 100644
--- a/src/pages/views/workspace/ChatStream.tsx
+++ b/src/pages/views/workspace/ChatStream.tsx
@@ -33,6 +33,108 @@ interface ChatStreamProps {
   onOpenEditor?: () => void;
 }
 
+const LONG_MESSAGE_WORD_LIMIT = 1000;
+const COLLAPSED_PREVIEW_WORDS = 200;
+
+function _countWords(text: string): number {
+  const trimmed = text.trim();
+  if (!trimmed) return 0;
+  return trimmed.split(/\s+/).length;
+}
+
+function _truncateToWords(text: string, maxWords: number): string {
+  const words = text.trim().split(/\s+/);
+  if (words.length <= maxWords) return text;
+  return `${words.slice(0, maxWords).join(' ')}…`;
+}
+
+const _MARKDOWN_COMPONENTS = {
+  code: _CodeBlock,
+  table: ({ children }: { children?: React.ReactNode }) => (
+    <div style={{ overflowX: 'auto', margin: '8px 0' }}>
+      <table style={{
+        borderCollapse: 'collapse',
+        width: '100%',
+        fontSize: 13,
+      }}>
+        {children}
+      </table>
+    </div>
+  ),
+  th: ({ children }: { children?: React.ReactNode }) => (
+    <th style={{
+      borderBottom: '2px solid #ddd',
+      padding: '6px 10px',
+      textAlign: 'left',
+      fontWeight: 600,
+      background: '#f8f9fa',
+      fontSize: 12,
+    }}>
+      {children}
+    </th>
+  ),
+  td: ({ children }: { children?: React.ReactNode }) => (
+    <td style={{
+      borderBottom: '1px solid #eee',
+      padding: '5px 10px',
+      fontSize: 12,
+    }}>
+      {children}
+    </td>
+  ),
+  a: ({ href, children }: { href?: string; children?: React.ReactNode }) => (
+    <a href={href} target="_blank" rel="noopener noreferrer" style={{ color: 'var(--primary-color, #F25843)' }}>
+      {children}
+    </a>
+  ),
+  img: ({ src, alt, ...rest }: React.ImgHTMLAttributes<HTMLImageElement>) =>
+    src ? <img src={src} alt={alt || ''} {...rest} style={{ maxWidth: '100%', borderRadius: 6 }} /> : null,
+};
+
+function _CollapsibleMessageMarkdown({
+  text,
+  allowCollapse,
+}: {
+  text: string;
+  allowCollapse: boolean;
+}) {
+  const { t } = useLanguage();
+  const [expanded, setExpanded] = useState(false);
+  const wordCount = _countWords(text);
+  const isLong = wordCount > LONG_MESSAGE_WORD_LIMIT;
+  const shouldTruncate = isLong && allowCollapse && !expanded;
+  const displayText = shouldTruncate ? _truncateToWords(text, COLLAPSED_PREVIEW_WORDS) : text;
+
+  return (
+    <>
+      <ReactMarkdown remarkPlugins={[remarkGfm]} components={_MARKDOWN_COMPONENTS}>
+        {displayText}
+      </ReactMarkdown>
+      {isLong && allowCollapse && (
+        <button
+          type="button"
+          onClick={() => setExpanded(prev => !prev)}
+          style={{
+            marginTop: 6,
+            padding: 0,
+            border: 'none',
+            background: 'none',
+            color: 'var(--primary-color, #F25843)',
+            cursor: 'pointer',
+            fontSize: 12,
+            fontWeight: 600,
+            textAlign: 'left',
+          }}
+        >
+          {expanded
+            ? t('Weniger anzeigen')
+            : t('Mehr anzeigen ({n} Wörter)', { n: String(wordCount) })}
+        </button>
+      )}
+    </>
+  );
+}
+
 export const ChatStream: React.FC<ChatStreamProps> = ({ messages,
   agentProgress,
   isProcessing,
@@ -49,6 +151,8 @@ export const ChatStream: React.FC<ChatStreamProps> = ({ messages,
   const enqueuedIdsRef = useRef<Set<string>>(new Set());
   const [copiedId, setCopiedId] = useState<string | null>(null);
 
+  const lastMessageId = messages.length > 0 ? messages[messages.length - 1].id : null;
+
   const _handleCopy = useCallback((msgId: string, text: string) => {
     navigator.clipboard.writeText(text).then(() => {
       setCopiedId(msgId);
@@ -157,53 +261,10 @@ export const ChatStream: React.FC<ChatStreamProps> = ({ messages,
                 </div>
               )}
               {msg.message && (
-                <ReactMarkdown
-                  remarkPlugins={[remarkGfm]}
-                  components={{
-                    code: _CodeBlock,
-                    table: ({ children }) => (
-                      <div style={{ overflowX: 'auto', margin: '8px 0' }}>
-                        <table style={{
-                          borderCollapse: 'collapse',
-                          width: '100%',
-                          fontSize: 13,
-                        }}>
-                          {children}
-                        </table>
-                      </div>
-                    ),
-                    th: ({ children }) => (
-                      <th style={{
-                        borderBottom: '2px solid #ddd',
-                        padding: '6px 10px',
-                        textAlign: 'left',
-                        fontWeight: 600,
-                        background: '#f8f9fa',
-                        fontSize: 12,
-                      }}>
-                        {children}
-                      </th>
-                    ),
-                    td: ({ children }) => (
-                      <td style={{
-                        borderBottom: '1px solid #eee',
-                        padding: '5px 10px',
-                        fontSize: 12,
-                      }}>
-                        {children}
-                      </td>
-                    ),
-                    a: ({ href, children }) => (
-                      <a href={href} target="_blank" rel="noopener noreferrer" style={{ color: 'var(--primary-color, #F25843)' }}>
-                        {children}
-                      </a>
-                    ),
-                    img: ({ src, alt, ...rest }) =>
-                      src ? <img src={src} alt={alt || ''} {...rest} style={{ maxWidth: '100%', borderRadius: 6 }} /> : null,
-                  }}
-                >
-                  {msg.message}
-                </ReactMarkdown>
+                <_CollapsibleMessageMarkdown
+                  text={msg.message}
+                  allowCollapse={!(isProcessing && msg.id === lastMessageId && msg.role === 'assistant')}
+                />
               )}
               {msg.documents && msg.documents.length > 0 && (
                 <div style={{ marginTop: msg.message ? 8 : 0, display: 'flex', flexDirection: 'column', gap: 6 }}>
diff --git a/src/pages/views/workspace/WorkspaceInput.tsx b/src/pages/views/workspace/WorkspaceInput.tsx
index 843a3bf..e953015 100644
--- a/src/pages/views/workspace/WorkspaceInput.tsx
+++ b/src/pages/views/workspace/WorkspaceInput.tsx
@@ -68,7 +68,6 @@ interface WorkspaceInputProps {
   onPendingAttachDsConsumed?: () => void;
   pendingAttachFdsId?: string;
   onPendingAttachFdsConsumed?: () => void;
-  onPasteAsFile?: (file: File) => void;
   draftAppend?: string;
   onDraftAppendConsumed?: () => void;
   workflowId?: string | null;
@@ -136,7 +135,6 @@ export const WorkspaceInput = forwardRef<WorkspaceInputHandle, WorkspaceInputPro
   onPendingAttachDsConsumed,
   pendingAttachFdsId,
   onPendingAttachFdsConsumed,
-  onPasteAsFile,
   draftAppend,
   onDraftAppendConsumed,
   workflowId,
@@ -508,17 +506,6 @@ export const WorkspaceInput = forwardRef<WorkspaceInputHandle, WorkspaceInputPro
   const hasAttachments = hasFileOrSourceAttachments;
   const _controlSize = isMobile ? 38 : 40;
 
-  const _handlePaste = useCallback((e: React.ClipboardEvent<HTMLTextAreaElement>) => {
-    if (!onPasteAsFile) return;
-    const text = e.clipboardData.getData('text/plain');
-    if (text && text.length >= 1000) {
-      e.preventDefault();
-      const blob = new Blob([text], { type: 'text/plain' });
-      const file = new File([blob], `pasted-text-${Date.now()}.txt`, { type: 'text/plain' });
-      onPasteAsFile(file);
-    }
-  }, [onPasteAsFile]);
-
   const _isTreeMimeDrag = useCallback((e: React.DragEvent) => {
     const types = e.dataTransfer.types;
     return (
@@ -768,7 +755,6 @@ export const WorkspaceInput = forwardRef<WorkspaceInputHandle, WorkspaceInputPro
           value={prompt}
           onChange={_handleChange}
           onKeyDown={_handleKeyDown}
-          onPaste={_handlePaste}
           onDragEnter={_handleTextareaDragEnter}
           onDragLeave={_handleTextareaDragLeave}
           onDragOver={_handleTextareaDragOver}
diff --git a/src/pages/views/workspace/WorkspacePage.tsx b/src/pages/views/workspace/WorkspacePage.tsx
index bdfb63b..dd215b3 100644
--- a/src/pages/views/workspace/WorkspacePage.tsx
+++ b/src/pages/views/workspace/WorkspacePage.tsx
@@ -503,7 +503,6 @@ export const WorkspacePage: React.FC<WorkspacePageProps> = ({ persistentInstance
         onPendingAttachDsConsumed={() => { setPendingAttachDsId(''); setPendingAttachDsLabel(''); }}
         pendingAttachFdsId={pendingAttachFdsId}
         onPendingAttachFdsConsumed={() => setPendingAttachFdsId('')}
-        onPasteAsFile={_uploadAndAttach}
         draftAppend={draftAppend}
         onDraftAppendConsumed={() => setDraftAppend('')}
         workflowId={workspace.workflowId}