Guardian Shield

Guardian Shield is an open-source MCP server that acts as a universal AI security middleware, exposing a suite of tools for code vulnerability scanning, PII detection and redaction, prompt injection defense, secret and credential detection, and audit logging. It also covers dependency security with CVE checks across multiple ecosystems, manifest parsing, and quality gates for CI workflows, with tailored safety profiles for industry compliance (general, education, healthcare, finance, children). The server is highly suitable for developers, AI integrators, and organizations seeking a plug-and-play security and compliance layer in their AI-powered applications or agent environments. It integrates with MCP-compatible clients such as Claude, Cursor, VS Code, and can be easily attached to existing developer workflows.