diff --git a/invokeai/app/invocations/image.py b/invokeai/app/invocations/image.py
index 7330cd73be..65ea4c3edb 100644
--- a/invokeai/app/invocations/image.py
+++ b/invokeai/app/invocations/image.py
@@ -28,12 +28,28 @@ class ImageOutput(BaseInvocationOutput):
     image:      ImageField = Field(default=None, description="The output image")
     #fmt: on
 
+    class Config:
+        schema_extra = {
+            'required': [
+                'type',
+                'image',
+            ]
+        }
+
 class MaskOutput(BaseInvocationOutput):
     """Base class for invocations that output a mask"""
     #fmt: off
     type: Literal["mask"] = "mask"
     mask:      ImageField = Field(default=None, description="The output mask")
-    #fomt: on
+    #fmt: on
+
+    class Config:
+        schema_extra = {
+            'required': [
+                'type',
+                'mask',
+            ]
+        }
 
 # TODO: this isn't really necessary anymore
 class LoadImageInvocation(BaseInvocation):
diff --git a/invokeai/app/invocations/prompt.py b/invokeai/app/invocations/prompt.py
index 3544f30859..0c7e3069df 100644
--- a/invokeai/app/invocations/prompt.py
+++ b/invokeai/app/invocations/prompt.py
@@ -12,3 +12,11 @@ class PromptOutput(BaseInvocationOutput):
 
     prompt: str = Field(default=None, description="The output prompt")
     #fmt: on
+
+    class Config:
+        schema_extra = {
+            'required': [
+                'type',
+                'prompt',
+            ]
+        }
diff --git a/invokeai/app/services/graph.py b/invokeai/app/services/graph.py
index 0d4102c416..171d86c9e3 100644
--- a/invokeai/app/services/graph.py
+++ b/invokeai/app/services/graph.py
@@ -127,6 +127,13 @@ class NodeAlreadyExecutedError(Exception):
 class GraphInvocationOutput(BaseInvocationOutput):
     type: Literal["graph_output"] = "graph_output"
 
+    class Config:
+        schema_extra = {
+            'required': [
+                'type',
+                'image',
+            ]
+        }
 
 # TODO: Fill this out and move to invocations
 class GraphInvocation(BaseInvocation):
@@ -147,6 +154,13 @@ class IterateInvocationOutput(BaseInvocationOutput):
 
     item: Any = Field(description="The item being iterated over")
 
+    class Config:
+        schema_extra = {
+            'required': [
+                'type',
+                'item',
+            ]
+        }
 
 # TODO: Fill this out and move to invocations
 class IterateInvocation(BaseInvocation):
@@ -169,6 +183,13 @@ class CollectInvocationOutput(BaseInvocationOutput):
 
     collection: list[Any] = Field(description="The collection of input items")
 
+    class Config:
+        schema_extra = {
+            'required': [
+                'type',
+                'collection',
+            ]
+        }
 
 class CollectInvocation(BaseInvocation):
     """Collects values into a collection"""