Add file content debugging

tool.py

@@ -236,8 +236,11 @@ class BrightDataDatasetTool(Tool):
             if isinstance(path_value, str) and os.path.isfile(path_value):
                 # Read the file content (smolagents writes URL as file content)
                 file_content = self._read_text_file(path_value)
+                import sys
+                print(f"[DEBUG _coerce_url_input] File content from {path_value}: {file_content!r}", file=sys.stderr)
                 if file_content:
                     extracted = self._extract_url_from_text(file_content)
+                    print(f"[DEBUG _coerce_url_input] Extracted URL: {extracted!r}", file=sys.stderr)
                     if extracted:
                         return extracted