CodeGuardian is an MCP server built on Node.js that extends AI coding assistants like GitHub Copilot with eleven specialized tools for security scanning and code quality analysis. It covers vulnerability detection (SQL injection, RCE, CSRF, Log4j CVEs), code quality metrics (Cyclomatic Complexity, Maintainability Index), SBOM generation, and PR management — all accessible via natural language prompts inside the IDE. Unlike traditional tools that only flag issues, CodeGuardian generates context-aware, drop-in code fixes. Benchmarks show 88.3% precision and 89.2% recall across 15+ vulnerability categories. A real-world pilot with two teams over four weeks found 47 previously unknown vulnerabilities, achieved 75% weekly adoption, and resolved 68% of issues within a single sprint. Limitations include regex-based detection (no taint analysis), limited support for C/C++/Ruby/PHP, and performance degradation on monorepos exceeding 1,000 files.
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