This is the core specification repository for SLSA (Supply-chain Levels for Software Artifacts), a security framework for software supply chain integrity. It contains the normative specification documents (markdown), attestation schemas (protobuf, CUE), a Jekyll-based website (slsa.dev), and tooling scripts for managing multi-version documentation and linting. The repo does not implement SLSA directly; it defines standards. Architecturally it is a static site generator with versioned spec content, GitHub Actions CI, and Netlify deployment. The only runtime artifact is the website. The specification documents are the primary output, and the repository also includes thorough threat models and usage guidance.