WordPress at a glance
action is not described

wp_install action-hook . WP 3.9.0

Fires after a site is fully installed.

Usage

add_action( 'wp_install', 'action_function_name_6815' );
function action_function_name_6815( $user ){
	// action...
}
$user(WP_User)
The site owner.

Where the hook is called

wp_install()
wp_install
wp-admin/includes/upgrade.php 109
do_action( 'wp_install', $user );

Where the hook is used (in WP core)

Does not used.