docs(langchain): document middleware-registered stream transformers#4126
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Nick Hollon (nick-hollon-lc) wants to merge 2 commits into
Open
docs(langchain): document middleware-registered stream transformers#4126Nick Hollon (nick-hollon-lc) wants to merge 2 commits into
Nick Hollon (nick-hollon-lc) wants to merge 2 commits into
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Add a subsection to the LangChain event streaming page covering the new `AgentMiddleware.transformers` attribute (langchain-ai/langchain#37591), including the compile-time merge order: ToolCallTransformer → middleware-registered factories → caller-supplied `transformers=`.
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Thanks for opening a docs PR, Nick Hollon (@nick-hollon-lc)! When it's ready for review, please add the relevant reviewers:
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Mintlify preview branch generated: Site preview: https://langchain-5e9cc07a-preview-nhmidd-1779380202-e986092.mintlify.app Preview links may take a few minutes to start working while the deployment finishes. Changed documentation pages (preview deep links): |
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Documents the new
AgentMiddleware.transformersattribute introduced in langchain-ai/langchain#37591. Middleware can now declare scope-awareStreamTransformerfactories alongside theirtoolsand lifecycle hooks;create_agentmerges them with caller-suppliedtransformers=at compile time.Summary
Register transformers on middlewaresubsection under "Custom updates" insrc/oss/langchain/event-streaming.mdx.ToolCallTransformer→ middleware-registered factories (in middleware order) → caller-suppliedtransformers=fromcreate_agent.:::pythonfenced) — the upstream PR only ships the Python surface. JS parity can be documented whenlangchainjsadds the equivalent.Reviewer notes
<Note>pins the minimum version tolangchain>=1.3.2(next patch after the current1.3.1). If the upstream PR ends up shipping in a different release, adjust the note.langchainrelease that contains it is published.Test plan
make lint_prose FILES="src/oss/langchain/event-streaming.mdx"— cleanlangchainrelease tag matches the<Note>before merge