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AI Agents · Class

SystemMessage

SystemMessage holds initial instructions for a model. It can define the model's role, tone, and response rules.

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Syntax

SystemMessage(content)

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

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  • HumanMessage
  • AIMessage
  • ToolMessage
  • dynamic_prompt
  • system_prompt

Source: Messages. Checked 2026-11-03.