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LangChain · Class

SystemMessage

SystemMessage represents a LangChain message with the system role. It carries instructions and supports text access, formatting, serialization, and concatenation.

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Syntax

new SystemMessage(content)

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

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  • BaseMessage
  • MessageStructure
  • MessageType
  • StoredMessage

Source: SystemMessage | @langchain/core | LangChain Reference. Checked 2026-11-03.