Update app.py

app.py

@@ -141,6 +141,7 @@ for name, fn in [
     ("wiki_tool", wiki_tool),
     ("ocr_tool", ocr_tool),
     ("audio_tool", audio_tool),
+    ("excel_tool", excel_tool),
     ("final_node", final_node),
 ]:
     graph.add_node(name, fn)