Security MCP servers give AI assistants access to vulnerability scanners, secrets managers, dependency auditors, and threat-intelligence feeds — letting security engineers ask questions like "which of my npm packages have known CVEs?" or "what secrets are exposed in this codebase?" in plain English. They are built for use in authorised security testing, DevSecOps pipelines, and internal red-team workflows rather than offensive purposes. Because security tooling carries inherent risk, always review a server's permissions and source code before installation.