From c2dea2657e313470c3c35cc2ff26b89b28056d7b Mon Sep 17 00:00:00 2001
From: zhangjiarui <zhangjiarui@uniontech.com>
Date: Tue, 9 Jun 2026 09:32:03 +0800
Subject: [PATCH] fix: handle bare dict annotations in transform

Avoid indexing missing type arguments when request transform logic sees an unparameterized dict field.

Fixes #3338
---
 src/openai/_utils/_transform.py | 12 ++++++++++--
 tests/test_transform.py         | 12 ++++++++++++
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/src/openai/_utils/_transform.py b/src/openai/_utils/_transform.py
index 414f38c340..cd3084a3bb 100644
--- a/src/openai/_utils/_transform.py
+++ b/src/openai/_utils/_transform.py
@@ -180,7 +180,11 @@ def _transform_recursive(
         return _transform_typeddict(data, stripped_type)
 
     if origin == dict and is_mapping(data):
-        items_type = get_args(stripped_type)[1]
+        args = get_args(stripped_type)
+        if len(args) < 2:
+            return data
+
+        items_type = args[1]
         return {key: _transform_recursive(value, annotation=items_type) for key, value in data.items()}
 
     if (
@@ -346,7 +350,11 @@ async def _async_transform_recursive(
         return await _async_transform_typeddict(data, stripped_type)
 
     if origin == dict and is_mapping(data):
-        items_type = get_args(stripped_type)[1]
+        args = get_args(stripped_type)
+        if len(args) < 2:
+            return data
+
+        items_type = args[1]
         return {key: _transform_recursive(value, annotation=items_type) for key, value in data.items()}
 
     if (
diff --git a/tests/test_transform.py b/tests/test_transform.py
index bece75dfc7..874c205906 100644
--- a/tests/test_transform.py
+++ b/tests/test_transform.py
@@ -154,6 +154,18 @@ class Bar7(TypedDict):
     foo: str
 
 
+class Foo7BareDict(TypedDict):
+    metadata: dict
+
+
+@parametrize
+@pytest.mark.asyncio
+async def test_bare_dict_typeddict_field(use_async: bool) -> None:
+    data = {"metadata": {"key": "value"}}
+
+    assert await transform(data, Foo7BareDict, use_async) == data
+
+
 @parametrize
 @pytest.mark.asyncio
 async def test_ignores_invalid_input(use_async: bool) -> None: