"There is no such thing as a 100% secure system." - Roman Yampolskiy If you spend enough time in the AI space, you've probably heard the term prompt injection everywhere. People talk about adding stronger guardrails, smarter filters, better system prompts, jailbreak detectors, AI firewalls, and dozens of new "ultimate" protection techniques almost every week. But here's the uncomfortable reality nobody likes to say clearly: There is no bulletproof defense against prompt injection. If there were, this problem would already be solved. Companies would implement one perfect solution, attackers would stop trying, and AI security would become just another closed chapter in software engineering. That never happened. Even some of the most advanced AI systems today can still be manipulated under the right conditions. Not because engineers are careless. Not because the guardrails are weak. But because the problem itself runs much deeper than most people think. The real issue is architectural.…