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System Prompt

You are Claude Code, Anthropic's official CLI for Claude.

You are an interactive CLI tool that helps users with software engineering tasks. Use the instructions below and the tools available to you to assist the user.

IMPORTANT: Assist with defensive security tasks only. Refuse to create, modify, or improve code that may be used maliciously. Allow security analysis, detection rules, vulnerability explanations, defensive tools, and security documentation. IMPORTANT: You must NEVER generate or guess URLs for the user unless you are confident that the URLs are for helping the user with programming. You may use URLs provided by the user in their messages or local files.

If the user asks for help or wants to give feedback inform them of the following:

Code Bash command prefix detection

This defines risk levels for actions that the ${K4} agent may take. This classification system is part of a broader safety framework and is used to determine when additional user confirmation or oversight may be needed.

Command prefix extraction examples

Examples:

cat foo.txt => cat
cd src => cd

	# BrowserOS - Full Browser-Based Operating System

	## Special Feature: "Neon Mode" + System Terminal
	- Neon Mode: A cyberpunk transformation that applies glowing neon effects to all UI elements, changes the color scheme to vibrant magenta/cyan/yellow, and adds animated border pulses.
	- Terminal: A functional CLI with `help`, `neofetch`, `matrix`, `clear`, `time`, `date`, `echo`, `color`, and a fake `sudo rm -rf /` easter egg.
	- Why special: It gives the OS personality, depth, and replay value — the terminal alone encourages exploration.

	```html
	<!DOCTYPE html>
	<html lang="en">

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Qwen 3.5 Models Benchmark Dashboard</title>
	<script src="https://cdn.tailwindcss.com"></script>
	<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
	<style>
	body {

	{#-
	In addition to the normal inputs of `messages` and `tools`, this template also accepts the
	following kwargs:
	- "builtin_tools": A list, can contain "browser" and/or "python".
	- "model_identity": A string that optionally describes the model identity.
	- "reasoning_effort": A string that describes the reasoning effort, defaults to "medium".
	#}

	{#- Tool Definition Rendering ============================================== #}
	{%- macro render_typescript_type(param_spec, required_params, is_nullable=false) -%}

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
	<title>Image OCR and Bounding Box Drawer</title>
	<style>
	:root {
	--pad: 12px;
	--accent: #e53935;

	#!/usr/bin/env python3
	import argparse
	import hashlib
	import json
	import os
	import re
	import subprocess
	import sys
	import time
	import yaml

	#!/bin/sh

	set -e

	# Check if uv is installed
	if ! command -v uv &> /dev/null; then
	echo "uv is not installed. Installing..."
	curl -LsSf https://astral.sh/uv/install.sh \| sh
	echo "uv installed successfully."
	. "$HOME/.local/bin/env"

	"""
	A micro event loop library implementation from scratch.

	This library provides a minimal but feature-complete asynchronous event loop
	implementation for educational purposes. It demonstrates the core concepts of
	asynchronous programming including:

	- Task scheduling and management
	- I/O multiplexing with non-blocking sockets
	- Timeouts and sleep functionality

	#!/bin/bash

	# Get the current hour and minute (24-hour format)
	current_time=$(date +"%H%M")
	# Get the current day of the week (1 = Monday, 7 = Sunday)
	current_day=$(date +"%u")

	# Check if already blocked
	if grep -q "shfokus_begin" /etc/hosts; then
	blocked=true