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Fix duplicated function_call entries with OpenAI Responses API #5252

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Fix duplicated function_call entries with OpenAI Responses API #5252

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5b39729
Fix duplicated function_call entries when using previous_response_id
joaquinhuigomez Mar 28, 2026
ef520e1
Fix pre-existing ruff lint issues
joaquinhuigomez Mar 28, 2026
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9 changes: 9 additions & 0 deletions livekit-plugins/livekit-plugins-openai/livekit/plugins/openai/responses/llm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -381,6 +381,15 @@ async def _run_impl(self) -> None:
self._response_completed = False
chat_ctx, _ = self._chat_ctx.to_provider_format(format="openai.responses")

# When using previous_response_id, the server already has function_call
# items from the previous response — don't send them again.
if "previous_response_id" in self._extra_kwargs:
chat_ctx = [
item
for item in chat_ctx
if not (isinstance(item, dict) and item.get("type") == "function_call")
]

self._tool_ctx = llm.ToolContext(self.tools)
tool_schemas = cast(
list[ToolParam],
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