Insider is an open-source command-line interface tool developed by the Insider Application Security Team for static source code analysis. The tool performs security analysis directly on source code to identify vulnerabilities and security issues. The tool supports multiple programming languages and technologies including Java, Kotlin, Swift, .NET, C#, and JavaScript. It focuses on detecting security vulnerabilities that align with the OWASP Top 10 security risks. Insider integrates into development workflows through a GitHub Action, enabling automated security scanning within CI/CD pipelines. This integration allows development teams to incorporate security analysis into their DevOps processes without manual intervention. The tool operates as a static analysis security testing (SAST) solution, examining source code without executing the application. It provides vulnerability detection capabilities that help identify potential security flaws during the development phase before code deployment.