If you're not familiar, Agent Skills are the open standard for packaging instructions, scripts, and resources that AI coding agents can discover and use think Claude Code, Cursor, Codex, and dozens of others. It's a simple idea with a lot of power: you write a SKILL.md file, structure a folder around it, and suddenly your agent knows how to do something new.
The concept is great. The setup? Not so much.
The problem I kept running into
Every time I wanted to create a new skills repository, I found myself doing the same tedious dance. Create the folder structure. Write the SKILL.md with the right frontmatter. Set up the .claude-plugin/marketplace.json. Wire up a plugin.json for each skill. Add a GitHub Actions workflow for validation. Write sync scripts to keep the README and marketplace config in sync as skills get added or removed.
Build Skill is a CLI that scaffolds AI agent skill repositories in seconds. One command — npx build-skill — gives you a fully spec-compliant repo with the right folder structure, SKILL.md templates, marketplace config, GitHub Actions for validation and syncing, and helper scripts to add new skills as you grow. Interactive or quiet mode for CI pipelines. Skip the boilerplate and start writing skills immediately. Open source, MIT licensed.
