connect.kak is also a framework for developing your own plugins.
Integration with other applications usually comes from writing a small program,
typically a shell script, and prefixed with : (e.g. :dolphin) by convention.
Plugins can register their paths to the connect_paths option to add their utilities,
and the same programs can be called inside Kakoune using the > or $ commands (e.g. > :yank-ring).
Usually, plugin authors also provide a Kakoune command for them (e.g. yank-ring).
The basic commands for plugin crafting are:
:send: Send commands to the client.:attach: Reattach to the session.:get: Get a value from a client. Example::get -quoting shell %val{selections}.