Update app.py

app.py

@@ -100,7 +100,7 @@ class LangGraphAgent:
             raw_response = self.model(content)
 
             # Detect tool usage
-            match = re.search(rf'Action:\s*({tool_name})\s*Action Input:\s*\"(.+?)\"', raw_response, re.DOTALL)
+            match = re.search(r"Action:\s*(\w+)\s*Action Input:\s*\"(.+?)\"", raw_response, re.DOTALL)
             if match:
                 tool_name, tool_input = match.groups()
                 tool_fn = self.tools.get(tool_name)