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[PR #4863] fix: preserve usage_metadata in streamed messages when using multiplestream modes #4109

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opened 2026-02-20 17:49:40 -05:00 by yindo · 0 comments
yindo commented 2026-02-20 17:49:40 -05:00
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Original Pull Request: https://github.com/langchain-ai/langgraph/pull/4863

State: closed
Merged: No

When using stream_mode=["values", "messages"], usage_metadata was being lost in the streamed messages. This fix ensures that usage_metadata is preserved by copying it into additional_kwargs in the StreamMessagesHandler._emit method. A test is added to verify this behavior.

Fix https://github.com/langchain-ai/langgraph/issues/4848

Added test cases for possible fix so to understand that it returns messages and values as response

**Original Pull Request:** https://github.com/langchain-ai/langgraph/pull/4863 **State:** closed **Merged:** No --- When using stream_mode=["values", "messages"], usage_metadata was being lost in the streamed messages. This fix ensures that usage_metadata is preserved by copying it into additional_kwargs in the StreamMessagesHandler._emit method. A test is added to verify this behavior. Fix https://github.com/langchain-ai/langgraph/issues/4848 Added test cases for possible fix so to understand that it returns messages and values as response
yindo added the pull-request label 2026-02-20 17:49:40 -05:00
yindo closed this issue 2026-02-20 17:49:40 -05:00
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Reference: langchain-ai/langgraph#4109
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