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Responses API streaming response.function_call_arguments.done event missing function name #2723
Description
Confirm this is an issue with the Python library and not an underlying OpenAI API
- This is an issue with the Python library
Describe the bug
The name attribute for the response.function_call_arguments.done event is None so you can't figure out which function to call. I tried uninstalling and reinstalling the latest openai version and still the same problem. I tried to add multiple tools and still the same problem.
To Reproduce
TOOLS_SPEC = [
{
"type": "function",
"name": "search_parts",
"description": "Check the availability of a specific auto part based on the provided vehicle information.",
"parameters": {
"type": "object",
"properties": {
"make": {"type": "string"},
"model": {"type": "string"},
"year": {"type": "string"},
"part_type": {"type": "string"}
},
"required": ["make", "model", "year", "part_type"],
"additionalProperties": False,
},
}
]
stream = client.responses.create(
model="gpt-5-mini",
input=messages,
tools=TOOLS_SPEC,
stream=True,
reasoning={ "effort": "low", "summary": "auto" }
)
for event in stream:
et = getattr(event, "type", None)
if et == "response.function_call_arguments.done":
print("FUNC ARGS DONE:", event.model_dump())And I see this in the output
FUNC ARGS DONE: {'arguments': '{"make":"Ford","model":"Bronco","year":"2022","part_type":"Clutch Disc"}', 'item_id': 'fc_0accd097e3ea311f00690517123e5081a0a9cf17ce3c3a2132', 'name': None, 'output_index': 1, 'sequence_number': 125, 'type': 'response.function_call_arguments.done'}
The name attribute of the event is None so there isn't a way to tell what function the model is trying to call
Code snippets
OS
Windows
Python version
Python 3.12
Library version
openai-2.6.1
Reacted by Sam Redway
Activity
feat: Emit ResponseFunctionCallArgumentsDoneEvent with name from snap…
agurianov commentedon Dec 7, 2025
Hi, we are waiting for this fix instead of you releasing last time
Fix ChatGPT tool call parsing: work around name=null API bug
marcuswood-oai commentedon Sep 9, 2026
Thank you for reporting this. The SDK incorrectly declared
nameon argument-completion events. #3801 corrected that contract in 3.9.0.Please upgrade and replace
event.namewith the name from the function-call item, matched usingevent.item_id, as shown in the function-calling guide. This requires a code change; upgrading does not populatename. We’re closing because the SDK now matches the event contract.