diff --git a/moatless/trajectory.py b/moatless/trajectory.py
index 1aaeee1d..b88ad2e2 100644
--- a/moatless/trajectory.py
+++ b/moatless/trajectory.py
@@ -16,8 +16,8 @@
 
 class TrajectoryAction(BaseModel):
     action: ActionRequest
-    trigger: Optional[str]
-    retry_message: Optional[str]
+    trigger: Optional[str] = None
+    retry_message: Optional[str] = None
     completion_cost: Optional[float] = None
     input_tokens: Optional[int] = None
     output_tokens: Optional[int] = None