From 7c524ccacc5a8a3e59380c8a18f1c25c0cd32f19 Mon Sep 17 00:00:00 2001
From: laoyao0822 <laoyao0822@qq.com>
Date: Wed, 25 Mar 2026 21:12:01 +0800
Subject: [PATCH] feat(tool_call): changed return type of tool_call

Update the tool call response format so that all non-first chunks in a tool call have type: null.
---
 python/sglang/srt/entrypoints/openai/serving_chat.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/python/sglang/srt/entrypoints/openai/serving_chat.py b/python/sglang/srt/entrypoints/openai/serving_chat.py
index 67cfef0a9..61d467cb8 100644
--- a/python/sglang/srt/entrypoints/openai/serving_chat.py
+++ b/python/sglang/srt/entrypoints/openai/serving_chat.py
@@ -1359,7 +1359,8 @@ class OpenAIServingChat(OpenAIServingBase):
                     arguments=call_item.parameters,
                 ),
             )
-
+            if tool_call_id is None:
+                tool_call.type = None
             choice_data = ChatCompletionResponseStreamChoice(
                 index=index,
                 delta=DeltaMessage(tool_calls=[tool_call]),