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191191### Output style
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193A configuration that modifies Claude's system prompt to change response behavior, tone, or format. Unlike [CLAUDE.md](#claude-md), which Claude Code delivers as a user message after the system prompt, an output style changes the system prompt itself.
193A configuration that changes the instructions Claude Code gives Claude, to set response behavior, tone, or format. Unlike [CLAUDE.md](#claude-md), which adds project context alongside Claude Code's default instructions, a custom output style can replace the default software engineering instructions.
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195195Learn more: [Output styles](/docs/en/output-styles)
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