SkillCatalog, a Git-native skill manager for AI coding tools

SkillCatalog manages the instruction files that AI coding tools like Claude Code, Cursor, and Codex read from disk to shape their behavior. Hand-editing these files per-repo works for solo developers; it breaks down on a team of ten across multiple repositories. The app treats skills more like editor preferences than packages — there's a shared team baseline, but individual engineers layer their own selections on top without touching the shared catalog. The hierarchy is skills (Markdown with frontmatter) → stacks (ordered skill lists) → bundles (ordered stack lists) → profiles. Home profiles apply everywhere; project profiles inherit from them, with project-specific selections taking priority. Access control is Git access — no server to run, no external service, nothing leaves the machine unless you push. A drift detector flags hand-edited delivered files, which is useful when debugging unexpected AI behavior. The stack is a Rust Tauri v2 desktop app with a React frontend, plus a skc CLI for scripting and CI. Available on macOS via Homebrew; Linux and Windows are in progress.

Engineering teams use SkillCatalog to manage and version the AI coding-tool instruction files (Claude Code, Cursor, Codex) shared across multiple repositories using Git as the delivery layer.