fix openai tool calls (#20831)

Author: logan-markewich

llama-index-integrations/llms/llama-index-llms-openai/llama_index/llms/openai/base.py

@@ -1010,16 +1010,20 @@ def _prepare_chat_with_tools(
         if user_msg:
             messages.append(user_msg)
 
-        return {
+        kwargs = {
             "messages": messages,
             "tools": tool_specs or None,
             "tool_choice": resolve_tool_choice(tool_choice, tool_required)
             if tool_specs
             else None,
-            "parallel_tool_calls": allow_parallel_tool_calls if tool_specs else None,
             **kwargs,
         }
 
+        if tool_specs:
+            kwargs["parallel_tool_calls"] = allow_parallel_tool_calls
+
+        return kwargs
+
     def _validate_chat_with_tools_response(
         self,
         response: ChatResponse,

llama-index-integrations/llms/llama-index-llms-openai/pyproject.toml

@@ -27,7 +27,7 @@ dev = [
 
 [project]
 name = "llama-index-llms-openai"
-version = "0.6.22"
+version = "0.6.23"
 description = "llama-index llms openai integration"
 authors = [{name = "llama-index"}]
 requires-python = ">=3.9,<4.0"

llama-index-integrations/llms/llama-index-llms-openai/tests/test_llms_openai.py

@@ -125,7 +125,7 @@ def test_prepare_chat_with_tools_no_tools():
     assert "messages" in result
     assert result["tools"] is None
     assert result["tool_choice"] is None
-    assert result["parallel_tool_calls"] is None
+    assert "parallel_tool_calls" not in result
 
 
 def test_prepare_chat_with_tools_explicit_tool_choice_overrides_tool_required():