diff --git a/google/genai/_gaos/resources/interactions/environment/__init__.py b/google/genai/_gaos/resources/interactions/environment/__init__.py
index 06a67cbf3..56de8d46e 100644
--- a/google/genai/_gaos/resources/interactions/environment/__init__.py
+++ b/google/genai/_gaos/resources/interactions/environment/__init__.py
@@ -18,6 +18,5 @@
 
 from ....types.interactions.environmentnetworkegressallowlist import Allowlist
 from ....types.interactions.source import Source
-from . import allowlist
 
-__all__ = ["Allowlist", "Source", "allowlist"]
+__all__ = ["Allowlist", "Source"]
diff --git a/google/genai/_gaos/resources/interactions/environment/allowlist/__init__.py b/google/genai/_gaos/resources/interactions/environment/allowlist/__init__.py
deleted file mode 100644
index 63b9597f9..000000000
--- a/google/genai/_gaos/resources/interactions/environment/allowlist/__init__.py
+++ /dev/null
@@ -1,21 +0,0 @@
-# Copyright 2026 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.
-#
-# pyformat: disable
-
-"""Code generated by Speakeasy (https://speakeasy.com). DO NOT EDIT."""
-
-from .....types.interactions.allowlistentry import AllowlistEntry as Allowlist
-
-__all__ = ["Allowlist"]
diff --git a/google/genai/_gaos/types/interactions/__init__.py b/google/genai/_gaos/types/interactions/__init__.py
index e66a6e8bd..9a8e1b433 100644
--- a/google/genai/_gaos/types/interactions/__init__.py
+++ b/google/genai/_gaos/types/interactions/__init__.py
@@ -23,7 +23,12 @@
 if TYPE_CHECKING:
     from .agentoption import AgentOption
     from .allowedtools import AllowedTools, AllowedToolsParam
-    from .allowlistentry import AllowlistEntry, AllowlistEntryParam
+    from .allowlistentry import (
+        AllowlistEntry,
+        AllowlistEntryParam,
+        Transform,
+        TransformParam,
+    )
     from .annotation import Annotation, AnnotationParam, UnknownAnnotation
     from .argumentsdelta import ArgumentsDelta, ArgumentsDeltaTypedDict
     from .audiocontent import AudioContent, AudioContentMimeType, AudioContentParam
@@ -660,6 +665,8 @@
     "ToolChoiceParam",
     "ToolChoiceType",
     "ToolParam",
+    "Transform",
+    "TransformParam",
     "Turn",
     "TurnContent",
     "TurnContentParam",
@@ -719,6 +726,8 @@
     "AllowedToolsParam": ".allowedtools",
     "AllowlistEntry": ".allowlistentry",
     "AllowlistEntryParam": ".allowlistentry",
+    "Transform": ".allowlistentry",
+    "TransformParam": ".allowlistentry",
     "Annotation": ".annotation",
     "AnnotationParam": ".annotation",
     "UnknownAnnotation": ".annotation",
diff --git a/google/genai/_gaos/types/interactions/allowlistentry.py b/google/genai/_gaos/types/interactions/allowlistentry.py
index 2a4631635..3968fa31c 100644
--- a/google/genai/_gaos/types/interactions/allowlistentry.py
+++ b/google/genai/_gaos/types/interactions/allowlistentry.py
@@ -19,8 +19,18 @@
 from __future__ import annotations
 from .. import BaseModel, UNSET_SENTINEL
 from pydantic import model_serializer
-from typing import Dict, List, Optional
-from typing_extensions import NotRequired, TypedDict
+from typing import Dict, List, Optional, Union
+from typing_extensions import NotRequired, TypeAliasType, TypedDict
+
+
+TransformParam = TypeAliasType(
+    "TransformParam", Union[Dict[str, str], List[Dict[str, str]]]
+)
+r"""Headers to inject on all outbound requests matching this domain. Accepts a single dict or a list of dicts. The egress proxy injects these automatically."""
+
+
+Transform = TypeAliasType("Transform", Union[Dict[str, str], List[Dict[str, str]]])
+r"""Headers to inject on all outbound requests matching this domain. Accepts a single dict or a list of dicts. The egress proxy injects these automatically."""
 
 
 class AllowlistEntryParam(TypedDict):
@@ -28,8 +38,8 @@ class AllowlistEntryParam(TypedDict):
 
     domain: str
     r"""Domain to allow outbound requests to. Supports wildcards (e.g. '*.googleapis.com'). Use '*' to allow all domains."""
-    transform: NotRequired[List[Dict[str, str]]]
-    r"""Headers to inject on all outbound requests matching this domain. Each entry is a flat {header_name: header_value} object. The egress proxy injects these automatically."""
+    transform: NotRequired[TransformParam]
+    r"""Headers to inject on all outbound requests matching this domain. Accepts a single dict or a list of dicts. The egress proxy injects these automatically."""
 
 
 class AllowlistEntry(BaseModel):
@@ -38,8 +48,8 @@ class AllowlistEntry(BaseModel):
     domain: str
     r"""Domain to allow outbound requests to. Supports wildcards (e.g. '*.googleapis.com'). Use '*' to allow all domains."""
 
-    transform: Optional[List[Dict[str, str]]] = None
-    r"""Headers to inject on all outbound requests matching this domain. Each entry is a flat {header_name: header_value} object. The egress proxy injects these automatically."""
+    transform: Optional[Transform] = None
+    r"""Headers to inject on all outbound requests matching this domain. Accepts a single dict or a list of dicts. The egress proxy injects these automatically."""
 
     @model_serializer(mode="wrap")
     def serialize_model(self, handler):
diff --git a/google/genai/tests/interactions/test_integration.py b/google/genai/tests/interactions/test_integration.py
index ae193fd72..d4bf53a41 100644
--- a/google/genai/tests/interactions/test_integration.py
+++ b/google/genai/tests/interactions/test_integration.py
@@ -23,7 +23,6 @@
 pytest_plugins = ("pytest_asyncio",)
 
 
-
 def test_client_timeout():
   with mock.patch.object(
       gaos_google_genai, "GenAI", spec_set=True
@@ -96,4 +95,31 @@ def test_unrecognized_model_request_serialization():
   assert dumped["body"]["model"] == "gemini-3.5-flash"
 
 
+def test_allowlist_entry_with_dict_transform():
+  from ..._gaos.types.interactions.allowlistentry import AllowlistEntry
+
+  # Should construct successfully with a single dict
+  entry = AllowlistEntry(
+      domain="github.com", transform={"Authorization": "Bearer TOKEN"}
+  )
+  assert entry.domain == "github.com"
+  assert entry.transform == {"Authorization": "Bearer TOKEN"}
+
+  # Serialization should preserve it as a dict
+  dumped = entry.model_dump()
+  assert dumped["transform"] == {"Authorization": "Bearer TOKEN"}
+
+
+def test_allowlist_entry_with_list_transform():
+  from ..._gaos.types.interactions.allowlistentry import AllowlistEntry
+
+  # Should construct successfully with a list of dicts
+  entry = AllowlistEntry(
+      domain="github.com", transform=[{"Authorization": "Bearer TOKEN"}]
+  )
+  assert entry.domain == "github.com"
+  assert entry.transform == [{"Authorization": "Bearer TOKEN"}]
 
+  # Serialization should preserve it as a list
+  dumped = entry.model_dump()
+  assert dumped["transform"] == [{"Authorization": "Bearer TOKEN"}]