HackAgent is an open-source security evaluation toolkit built for researchers, developers, and AI safety practitioners working with AI agents. It delivers a systematic approach to vulnerability discovery, covering prompt injection, jailbreak attacks, and additional threat vectors. Why HackAgent? Built for developers, red-teamers, and security engineers, HackAgent makes it easy to simulate adversarial inputs, automate prompt fuzzing, and validate the safety of AI agentic apps. Whether you’re building a chatbot, autonomous agent,