mpdupdate is a very simple plugin for beets that lets you automatically update MPD‘s index whenever you change your beets library.
To use it, enable it in your config.yaml by putting mpdupdate on your plugins line. Then, you’ll probably want to configure the specifics of your MPD server. You can do that using an mpd: section in your config.yaml, which looks like this:
mpd: host: localhost port: 6600 password: seekrit
With that all in place, you’ll see beets send the “update” command to your MPD server every time you change your beets library.
If you want to communicate with MPD over a Unix domain socket instead over TCP, just give the path to the socket in the filesystem for the host setting. (Any host value starting with a slash or a tilde is interpreted as a domain socket.)