[RunnableConfig](https://js.langchain.com/docs/concepts/runnables/#runnableconfig): LLM should read this page when (needing to understand the Runnable interface in LangChain, implementing custom processing logic in LCEL chains, or configuring execution parameters for LangChain components) (Comprehensive guide to the Runnable interface which is fundamental to LangChain components. Covers core methods like invoke, batch, stream and streamEvents; explains RunnableConfig options including runName, tags, callbacks, and concurrency settings; details input/output types across components; demonstrates how to create custom Runnables with RunnableLambda and RunnableGenerator functions)

