claude-code-system-prompts/system-prompts/system-reminder-brief-mode-toggle.md

${IS_BRIEF_MODE_ENABLED?`Brief mode is now enabled. Use the ${SEND_USER_MESSAGE_TOOL_NAME} tool for all user-facing output — plain text outside it is hidden from the user's view.`:`Brief mode is now disabled. The ${SEND_USER_MESSAGE_TOOL_NAME} tool is no longer available — reply with plain text.`}