WordPress at a glance
action is not described

add_meta_boxes action-hook . WP 3.0.0

Fires after all built-in meta boxes have been added.

Usage

add_action( 'add_meta_boxes', 'action_function_name_8149', 10, 2 );
function action_function_name_8149( $post_type, $post ){
	// action...
}
$post_type(string)
Post type.
$post(WP_Post)
Post object.

Changelog

Since 3.0.0 Introduced.

Where the hook is called

register_and_do_post_meta_boxes()
add_meta_boxes
wp-admin/includes/meta-boxes.php 1526
do_action( 'add_meta_boxes', $post_type, $post );
wp-admin/edit-link-form.php 35
do_action( 'add_meta_boxes', 'link', $link );
wp-admin/edit-form-comment.php 199
do_action( 'add_meta_boxes', 'comment', $comment );

Where the hook is used (in WP core)

Usage not found!