RepoGuard is an open-source architecture guardian for AI-assisted codebases. AI coding assistants (Cursor, Copilot, Claude Code) write 300 lines in seconds, but often bypass service layers, duplicate helpers, and scatter ": any" types. RepoGuard scans your repository stack, auto-generates strict .cursorrules, CLAUDE.md & .windsurfrules, and audits PRs in real-time with an instant Architectural Health Score (A+ to F). Zero dependencies, 100% free CLI on npm.