diff --git a/src/workflow/engine.py b/src/workflow/engine.py
index 5650987..c595e08 100644
--- a/src/workflow/engine.py
+++ b/src/workflow/engine.py
@@ -88,6 +88,12 @@ class DefaultDataPresenter(DataPresenter):
     
     return Expando(data.to_dict(self.mappings))
 
+class DefaultDataFilter(DataFilter):
+  """Default data filter that returns True for all data items."""
+  
+  def filter(self, data: Any) -> bool:
+    return True
+
 
 class WorkflowEngine:
   """Orchestrates the data processing pipeline using generators."""