diff --git a/src/Responses/Chat/CreateStreamedResponseToolCallFunction.php b/src/Responses/Chat/CreateStreamedResponseToolCallFunction.php
index 4a317dd1..f4368974 100644
--- a/src/Responses/Chat/CreateStreamedResponseToolCallFunction.php
+++ b/src/Responses/Chat/CreateStreamedResponseToolCallFunction.php
@@ -12,13 +12,13 @@ private function __construct(
     ) {}
 
     /**
-     * @param  array{name?: string, arguments: string}  $attributes
+     * @param  array{name?: string, arguments?: string}  $attributes
      */
     public static function from(array $attributes): self
     {
         return new self(
             $attributes['name'] ?? null,
-            $attributes['arguments'],
+            $attributes['arguments'] ?? '',
         );
     }
 
diff --git a/tests/Fixtures/Streams/ChatCompletionCreate.txt b/tests/Fixtures/Streams/ChatCompletionCreate.txt
index 6b9b6156..1431be36 100644
--- a/tests/Fixtures/Streams/ChatCompletionCreate.txt
+++ b/tests/Fixtures/Streams/ChatCompletionCreate.txt
@@ -9,4 +9,5 @@ data: {"id":"chatcmpl-6wdIE4DsUtqf1srdMTsfkJp0VWZgz","object":"chat.completion.c
 data: {"id":"chatcmpl-6wdIE4DsUtqf1srdMTsfkJp0VWZgz","object":"chat.completion.chunk","created":1679432086,"model":"gpt-4-0314","choices":[{"delta":{"content":" today"},"index":0,"finish_reason":null}]}
 data: {"id":"chatcmpl-6wdIE4DsUtqf1srdMTsfkJp0VWZgz","object":"chat.completion.chunk","created":1679432086,"model":"gpt-4-0314","choices":[{"delta":{"content":"?"},"index":0,"finish_reason":null}]}
 data: {"id":"chatcmpl-6wdIE4DsUtqf1srdMTsfkJp0VWZgz","object":"chat.completion.chunk","created":1679432086,"model":"gpt-4-0314","choices":[{"delta":{},"index":0,"finish_reason":"stop"}]}
+data: {"id":"chatcmpl-6wdIE4DsUtqf1srdMTsfkJp0VWZgz","object":"chat.completion.chunk","created":1751620274,"model":"gpt-4-0314","choices":[{"index":0,"delta":{"tool_calls":[{"id":"InRVNk0Ic","type":"function","index":0,"function":{"name":"get_weather"}}]}}]}
 data: [DONE]
diff --git a/tests/Resources/Chat.php b/tests/Resources/Chat.php
index 48693598..17663ac1 100644
--- a/tests/Resources/Chat.php
+++ b/tests/Resources/Chat.php
@@ -98,6 +98,11 @@
 
     expect($result->meta())
         ->toBeInstanceOf(MetaInformation::class);
+
+    foreach ($result->getIterator() as $response) {
+        expect($response)
+            ->toBeInstanceOf(CreateStreamedResponse::class);
+    }
 });
 
 test('handles ping messages in stream', function () {