TL;DR: A Claude Code marketplace is a GitHub repo with a specific folder structure. You create plugins inside it, push to GitHub, and anyone (including yourself) can install your plugins with two commands. This article shows you how to scaffold one from zero and add your first plugin.
Source: [Dev.to](https://dev.to/nagell/build-your-own-claude-code-marketplace-scaffold-structure-and-auto-updates-4n3f)