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A system prompt is a set of instructions given to Claude before the conversation begins. It defines Claude's persona, rules, and context.

Use Cases

  • Setting a custom persona (e.g. "You are a customer support agent for Acme Corp")
  • Restricting topics Claude will discuss
  • Providing background knowledge for the conversation
  • Defining output format requirements

System prompts are used via the API and are not visible to end users.


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Claude University: System Prompts — Customizing Claude's Behavior
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Reference:

System prompts documentation

image for linkhttps://docs.anthropic.com/en/docs/build-with-claude/prompt-engineering/system-prompts

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