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langchain_mistralai: Include finish_reason in response metadata when parsing MistralAI chunks toAIMessageChunk (#31667)

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## Description
<!-- What does this pull request accomplish? -->
- When parsing MistralAI chunk dicts to Langchain to `AIMessageChunk`
schemas via the `_convert_chunk_to_message_chunk` utility function, the
`finish_reason` was not being included in `response_metadata` as it is
for other providers.
- This PR adds a one-liner fix to include the finish reason.

- fixes: https://github.com/langchain-ai/langchain/issues/31666
This commit is contained in:
Saran Connolly 2025-06-20 20:41:20 +01:00 committed by GitHub
parent 7ff405077d
commit 22e6d90937
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1 changed files with 2 additions and 1 deletions
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3
libs/partners/mistralai/langchain_mistralai/chat_models.py
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@ -271,7 +271,8 @@ def _convert_chunk_to_message_chunk(
if _choice.get("finish_reason") is not None and isinstance(
chunk.get("model"), str
):
response_metadata["model_name"] = chunk.get("model")
response_metadata["model_name"] = chunk["model"]
response_metadata["finish_reason"] = _choice["finish_reason"]
return AIMessageChunk(
content=content,
additional_kwargs=additional_kwargs,