diff --git a/google/genai/_interactions/types/content_delta.py b/google/genai/_interactions/types/content_delta.py
index d104989ce..a608e5d27 100644
--- a/google/genai/_interactions/types/content_delta.py
+++ b/google/genai/_interactions/types/content_delta.py
@@ -155,7 +155,7 @@ class DeltaFunctionCallDelta(BaseModel):
     name: Optional[str] = None
 
 
-DeltaFunctionResultDeltaResultItemsItem: TypeAlias = Union[str, ImageContent, object]
+DeltaFunctionResultDeltaResultItemsItem: TypeAlias = Union[TextContent, ImageContent, object]
 
 
 class DeltaFunctionResultDeltaResultItems(BaseModel):
diff --git a/google/genai/_interactions/types/function_result_content.py b/google/genai/_interactions/types/function_result_content.py
index e8c2aa444..f5cdbc446 100644
--- a/google/genai/_interactions/types/function_result_content.py
+++ b/google/genai/_interactions/types/function_result_content.py
@@ -19,11 +19,12 @@
 from typing_extensions import Literal, TypeAlias
 
 from .._models import BaseModel
+from .text_content import TextContent
 from .image_content import ImageContent
 
 __all__ = ["FunctionResultContent", "Result", "ResultItems", "ResultItemsItem"]
 
-ResultItemsItem: TypeAlias = Union[str, ImageContent, object]
+ResultItemsItem: TypeAlias = Union[TextContent, ImageContent, object]
 
 
 class ResultItems(BaseModel):
diff --git a/google/genai/_interactions/types/function_result_content_param.py b/google/genai/_interactions/types/function_result_content_param.py
index 46a03e964..026d7cf00 100644
--- a/google/genai/_interactions/types/function_result_content_param.py
+++ b/google/genai/_interactions/types/function_result_content_param.py
@@ -17,19 +17,19 @@
 
 from __future__ import annotations
 
-from typing import Union
+from typing import Union, Iterable
 from typing_extensions import Literal, Required, TypeAlias, TypedDict
 
-from .._types import SequenceNotStr
+from .text_content_param import TextContentParam
 from .image_content_param import ImageContentParam
 
 __all__ = ["FunctionResultContentParam", "Result", "ResultItems", "ResultItemsItem"]
 
-ResultItemsItem: TypeAlias = Union[str, ImageContentParam, object]
+ResultItemsItem: TypeAlias = Union[TextContentParam, ImageContentParam, object]
 
 
 class ResultItems(TypedDict, total=False):
-    items: SequenceNotStr[ResultItemsItem]
+    items: Iterable[ResultItemsItem]
 
 
 Result: TypeAlias = Union[ResultItems, str, object]