A plugin is a folder with
.claude-plugin/plugin.json. Skills, agents, commands and hooks in the conventional folders are discovered automatically.
Install from a local path, restart the session, then confirm the skills, agents and hooks all appear.
A marketplace is a repository with a manifest listing plugins. Point colleagues at it once and they install by name.
/plugin install patterson-dev@patterson-marketplace
Record which parts are committed, which are personal, and who maintains the plugin. Setup nobody owns drifts within a month.