§ langchain · storyline
LangChain (JS) — core v1.1.40
LangChain.js core v1.1.40 releases a patch that decouples tracer-only metadata defaults from runnable metadata and adds tracer-scoped inheritable options in the callback manager.
Patch Changes #10694 `d3e0809` Thanks @hntrl! - refactor(core): decouple tracer-only metadata defaults from runnable metadata Add tracer-scoped inheritable metadata/tag options in callback manager while keeping backward-compatible aliases. Move configurable-to-tracing metadata derivation into a tracer-only path and keep `ensureConfig` metadata mirroring limited to `model`.
Update `LangChainTracer` default metadata/tag handling and add regression tests for stream events metadata behavior.
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