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HomeDocsClaude Code CLI 29 Aug 2026
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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. Custom styles leave out Claude Code's built-in software engineering instructions unless you set `keep-coding-instructions` to `true`, and the built-in Default, Proactive, Concise, Explanatory, and Learning styles keep them.
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.
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195195Learn more: [Output styles](/docs/en/output-styles)
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