[How to: add metadata and tags to traces](https://docs.smith.langchain.com/how_to_guides/tracing/trace_with_langchain#add-metadata-and-tags-to-traces): LLM should read this page when tracing LangChain applications with LangSmith, when logging metadata and tags to traces, and when customizing trace names and IDs. This page provides step-by-step guides on integrating LangSmith tracing with LangChain in Python and JS/TS, covering quick start instructions, selective tracing, logging to specific projects, adding metadata/tags, customizing run names/IDs, accessing run IDs, distributed tracing in Python, and interoperability with the LangSmith SDK.

