diff --git a/app/routes/messages.py b/app/routes/messages.py
index 08f28d56..46f03c89 100644
--- a/app/routes/messages.py
+++ b/app/routes/messages.py
@@ -75,7 +75,9 @@ def send_message(body: SendMessageRequest) -> SendMessageResponse:
             content=[
                 Content(
                     type=ContentType.TEXT,
-                    textContent=generated_vars["response"],  # V1 behavior: only return the 'response' variable
+                    textContent=generated_vars[
+                        "response"
+                    ],  # V1 behavior: only return the 'response' variable
                 )
             ],
         ),
diff --git a/tests/routes/messages_test.py b/tests/routes/messages_test.py
index b3b98368..3d5ba218 100644
--- a/tests/routes/messages_test.py
+++ b/tests/routes/messages_test.py
@@ -50,7 +50,9 @@ def test_send_message(test_client, headers, mocker):
             "query": "Some query",
         },
     }
-    response_v1 = test_client.post("/api/v1/messages", headers=headers, json=body)
+    response_v1 = test_client.post(
+        "/api/v1/messages", headers=headers, json=body
+    )
     assert response_v1.status_code == 200
     assert response_v1.json() == {
         "usedModel": "GPT35_TURBO",
@@ -60,7 +62,9 @@ def test_send_message(test_client, headers, mocker):
         },
     }
 
-    response_v2 = test_client.post("/api/v2/messages", headers=headers, json=body)
+    response_v2 = test_client.post(
+        "/api/v2/messages", headers=headers, json=body
+    )
     assert response_v2.status_code == 200
     assert response_v2.json() == {
         "usedModel": "GPT35_TURBO",