WP_CLI is a powerful tool, even right out of the box. But it can be made to do so much more. This talk will discuss extending WP_CLI by adding your own commands. Whether for simple site maintenance or helping to manage clients learn to utilize WP_CLI to it’s maximum extent the right way with tips on adding commands, handling input and output and making sure that users can figure out just what your command is doing. This is an advanced talk appropriate for intermediate to advanced developers.