diff --git a/google/genai/_interactions/types/__init__.py b/google/genai/_interactions/types/__init__.py
index bd448df72..a98193110 100644
--- a/google/genai/_interactions/types/__init__.py
+++ b/google/genai/_interactions/types/__init__.py
@@ -52,7 +52,6 @@
 from .document_content import DocumentContent as DocumentContent
 from .tool_choice_type import ToolChoiceType as ToolChoiceType
 from .generation_config import GenerationConfig as GenerationConfig
-from .interaction_event import InteractionEvent as InteractionEvent
 from .tool_choice_param import ToolChoiceParam as ToolChoiceParam
 from .document_mime_type import DocumentMimeType as DocumentMimeType
 from .image_config_param import ImageConfigParam as ImageConfigParam
@@ -76,6 +75,7 @@
 from .interaction_get_params import InteractionGetParams as InteractionGetParams
 from .function_result_content import FunctionResultContent as FunctionResultContent
 from .generation_config_param import GenerationConfigParam as GenerationConfigParam
+from .interaction_start_event import InteractionStartEvent as InteractionStartEvent
 from .document_mime_type_param import DocumentMimeTypeParam as DocumentMimeTypeParam
 from .file_search_call_content import FileSearchCallContent as FileSearchCallContent
 from .tool_choice_config_param import ToolChoiceConfigParam as ToolChoiceConfigParam
@@ -88,6 +88,7 @@
 from .file_search_result_content import FileSearchResultContent as FileSearchResultContent
 from .google_search_call_content import GoogleSearchCallContent as GoogleSearchCallContent
 from .google_search_result_param import GoogleSearchResultParam as GoogleSearchResultParam
+from .interaction_complete_event import InteractionCompleteEvent as InteractionCompleteEvent
 from .url_context_call_arguments import URLContextCallArguments as URLContextCallArguments
 from .url_context_result_content import URLContextResultContent as URLContextResultContent
 from .code_execution_call_content import CodeExecutionCallContent as CodeExecutionCallContent
diff --git a/google/genai/_interactions/types/interaction_event.py b/google/genai/_interactions/types/interaction_complete_event.py
similarity index 87%
rename from google/genai/_interactions/types/interaction_event.py
rename to google/genai/_interactions/types/interaction_complete_event.py
index 58f3d5418..843e1752c 100644
--- a/google/genai/_interactions/types/interaction_event.py
+++ b/google/genai/_interactions/types/interaction_complete_event.py
@@ -21,16 +21,16 @@
 from .._models import BaseModel
 from .interaction import Interaction
 
-__all__ = ["InteractionEvent"]
+__all__ = ["InteractionCompleteEvent"]
 
 
-class InteractionEvent(BaseModel):
+class InteractionCompleteEvent(BaseModel):
     event_id: Optional[str] = None
     """
     The event_id token to be used to resume the interaction stream, from this event.
     """
 
-    event_type: Optional[Literal["interaction.start", "interaction.complete"]] = None
+    event_type: Optional[Literal["interaction.complete"]] = None
 
     interaction: Optional[Interaction] = None
     """The Interaction resource."""
diff --git a/google/genai/_interactions/types/interaction_sse_event.py b/google/genai/_interactions/types/interaction_sse_event.py
index bc0e84f81..0eee49201 100644
--- a/google/genai/_interactions/types/interaction_sse_event.py
+++ b/google/genai/_interactions/types/interaction_sse_event.py
@@ -23,12 +23,21 @@
 from .content_stop import ContentStop
 from .content_delta import ContentDelta
 from .content_start import ContentStart
-from .interaction_event import InteractionEvent
+from .interaction_start_event import InteractionStartEvent
 from .interaction_status_update import InteractionStatusUpdate
+from .interaction_complete_event import InteractionCompleteEvent
 
 __all__ = ["InteractionSSEEvent"]
 
 InteractionSSEEvent: TypeAlias = Annotated[
-    Union[InteractionEvent, InteractionStatusUpdate, ContentStart, ContentDelta, ContentStop, ErrorEvent],
+    Union[
+        InteractionStartEvent,
+        InteractionCompleteEvent,
+        InteractionStatusUpdate,
+        ContentStart,
+        ContentDelta,
+        ContentStop,
+        ErrorEvent,
+    ],
     PropertyInfo(discriminator="event_type"),
 ]
diff --git a/google/genai/_interactions/types/interaction_start_event.py b/google/genai/_interactions/types/interaction_start_event.py
new file mode 100644
index 000000000..f637ddbb2
--- /dev/null
+++ b/google/genai/_interactions/types/interaction_start_event.py
@@ -0,0 +1,36 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
+
+from typing import Optional
+from typing_extensions import Literal
+
+from .._models import BaseModel
+from .interaction import Interaction
+
+__all__ = ["InteractionStartEvent"]
+
+
+class InteractionStartEvent(BaseModel):
+    event_id: Optional[str] = None
+    """
+    The event_id token to be used to resume the interaction stream, from this event.
+    """
+
+    event_type: Optional[Literal["interaction.start"]] = None
+
+    interaction: Optional[Interaction] = None
+    """The Interaction resource."""