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LangChain · Function

merge_message_runs

Merges adjacent messages of the same type into one message. Tool messages are kept separate because their tool call IDs cannot be merged.

Last updated

Since
v1.7

Syntax

merge_message_runs(messages: Iterable[MessageLikeRepresentation] | PromptValue, *, chunk_separator: str = '\n') -> list[BaseMessage]

In-depth API docs are only for subscribers: parameters, examples, common mistakes and interview practice.

Subscribe
  • BaseMessage
  • MessageLikeRepresentation
  • PromptValue
  • HumanMessage
  • AIMessage
  • SystemMessage
  • ToolMessage

Source: merge_message_runs | langchain_core | LangChain Reference. Checked 2026-11-03.