package util

import (
	"strings"
	"unicode"
)

const claudeCodeAttributionSystemPrefix = "x-anthropic-billing-header:"

// IsClaudeCodeAttributionSystemText reports whether text is the Claude Code
// attribution block that carries per-request billing and prompt fingerprint data.
func IsClaudeCodeAttributionSystemText(text string) bool {
	text = strings.TrimLeftFunc(text, unicode.IsSpace)
	return strings.HasPrefix(text, claudeCodeAttributionSystemPrefix)
}