diff --git a/libs/experimental/langchain_experimental/cpal/models.py b/libs/experimental/langchain_experimental/cpal/models.py
index 6be95bc70f4..6e2d83cdc8c 100644
--- a/libs/experimental/langchain_experimental/cpal/models.py
+++ b/libs/experimental/langchain_experimental/cpal/models.py
@@ -135,9 +135,9 @@ class ResultModel(BaseModel):
 class StoryModel(BaseModel):
     """Story data."""
 
-    causal_operations: Any = Field(required=True)
-    intervention: Any = Field(required=True)
-    query: Any = Field(required=True)
+    causal_operations: Any = Field()
+    intervention: Any = Field()
+    query: Any = Field()
     _outcome_table: Any = PrivateAttr(default=None)
     _networkx_wrapper: Any = PrivateAttr(default=None)
 
diff --git a/libs/experimental/tests/integration_tests/chains/test_cpal.py b/libs/experimental/tests/integration_tests/chains/test_cpal.py
index c3ad368e5b0..ebb65839d12 100644
--- a/libs/experimental/tests/integration_tests/chains/test_cpal.py
+++ b/libs/experimental/tests/integration_tests/chains/test_cpal.py
@@ -261,7 +261,7 @@ class TestUnitCPALChain_MathWordProblems(unittest.TestCase):
         expected_output = {
             "chain_answer": None,
             "chain_data": QueryModel(
-                narrative_input="how many pets does jan have? ",
+                question="how many pets does jan have? ",
                 llm_error_msg="",
                 expression="SELECT name, value FROM df WHERE name = 'jan'",
             ),