feat(js): automatic handoff from Langchain RunnableLambda to traceable #874
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hinthornw
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Jul 16, 2024
dqbd
changed the title
…into dqbd/transparent-handoff-vol2
agola11
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Jul 22, 2024
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We now share RunTree tracing context with LangChain, accompanying PR: langchain-ai/langchainjs#5992
To preserve the tracing context in LangChain, we store the child RunnableConfig in the
extra[Symbol.for("lc:child_config")]. As it's a symbol, it won't be sent to LangSmith.Before creating a child, we make sure that both
parentRunIdandrunMapis appropriately updated when handing tracing fromtraceabletoLangChain. The RunTree <-> LangChainTracer code has been moved to LangChain, however we still keep the code inlangsmith/langchainfor backwards compatibility.