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Fix #1846 Litellm: fails with function name for tool_choice parameter w/ streaming enabled #1971

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Merged
merged 1 commit into from
Oct 21, 2025
Merged

Fix #1846 Litellm: fails with function name for tool_choice parameter w/ streaming enabled #1971

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11 changes: 8 additions & 3 deletions src/agents/extensions/models/litellm_model.py
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,7 @@
from ...models.chatcmpl_stream_handler import ChatCmplStreamHandler
from ...models.fake_id import FAKE_RESPONSES_ID
from ...models.interface import Model, ModelTracing
from ...models.openai_responses import Converter as OpenAIResponsesConverter
from ...tool import Tool
from ...tracing import generation_span
from ...tracing.span_data import GenerationSpanData
Expand Down Expand Up @@ -367,15 +368,19 @@ async def _fetch_response(
if isinstance(ret, litellm.types.utils.ModelResponse):
return ret

responses_tool_choice = OpenAIResponsesConverter.convert_tool_choice(
model_settings.tool_choice
)
if responses_tool_choice is None or responses_tool_choice is omit:
responses_tool_choice = "auto"

response = Response(
id=FAKE_RESPONSES_ID,
created_at=time.time(),
model=self.model,
object="response",
output=[],
tool_choice=cast(Literal["auto", "required", "none"], tool_choice)
if tool_choice is not omit
else "auto",
tool_choice=responses_tool_choice, # type: ignore[arg-type]
top_p=model_settings.top_p,
temperature=model_settings.temperature,
tools=[],
Expand Down