Failure Flags is a software-level library developed by Gremlin to enhance the testing of software failure modes without compromising security or requiring extensive infrastructure changes. Unlike traditional Chaos Engineering, which focuses on infrastructure, Failure Flags allows for simulating fault conditions within applications, thereby improving the reliability of deployments. By using the Failure Flags SDK, developers can integrate fault-injection points into their code, which can then be used to run experiments that simulate various failure scenarios such as dependency loss, latency, and API gateway issues. This approach is designed to be safe and portable, ensuring that test configurations can be left in place without impacting application performance when not conducting experiments. Failure Flags can be used across multiple platforms and integrates with existing CI/CD and observability tools, making it a versatile addition to any development workflow.