fix: properly extract content before tool_calls block

- Search for the pattern in cleaned_text but extract position from original
- Strip trailing markdown block markers from content
- Ensure content is empty when tool_calls are present

src/api/routes.py

@@ -148,11 +148,18 @@ def parse_tool_calls(text: str) -> tuple:
                     return text, None
             
             # Find and remove the tool_calls section from text
-            full_match = re.search(pattern, text, re.DOTALL)
+            full_match = re.search(pattern, cleaned_text, re.DOTALL)
             if full_match:
-                content = text[:full_match.start()].strip()
+                # Extract content before the tool_calls block from original text
+                content_end = text.find(full_match.group(0))
+                if content_end > 0:
+                    content = text[:content_end].strip()
+                    # Also strip any markdown block start that might be there
+                    content = re.sub(r'```\w*\s*$', '', content).strip()
+                else:
+                    content = ""
             else:
-                content = text[:match.start()].strip()
+                content = ""
             return content, tool_calls
     except Exception as e:
         pass