[Managing chat history](https://js.langchain.com/docs/concepts/chat_history/#managing-chat-history): LLM should read this page when needing to understand chat history structures, implementing conversation management in LLM applications, or configuring proper message sequences for tool calling. (This page explains chat history concepts in LangChain, including conversation patterns between users and assistants, proper message sequencing, managing history to avoid context window limits, and guidelines for maintaining correct conversation structure with system, user, assistant, and tool messages.)

