diff --git a/models/itm.py b/models/itm.py
index 6b04182..8fd53e3 100644
--- a/models/itm.py
+++ b/models/itm.py
@@ -14,6 +14,13 @@ class ExtractModel(BaseModel):
     source: str = "body"
 
 
+class AssertModel(BaseModel):
+    type: str
+    path: str | None = None
+    operator: str = "equals"
+    value: Any = None
+
+
 class StepModel(BaseModel):
     name: str
     request: RequestModel