AI Crawlers and the New robots.txt Reality: GPTBot, Google-Extended, and ClaudeBot
GPTBot, ClaudeBot, Google-Extended, and a growing list of AI training crawlers now require active robots.txt management. Here's every major AI crawler and its user agent, how to block them selectively, the distinction between blocking Google-Extended vs Googlebot, and what "respect robots.txt" actually means in practice.