Echo out custom fields in comments

There is no comment_ID until you are in the foreach loop. Try:

$comments = get_comments($args);

foreach($comments as $comment) :
    echo '<div id="' . $comment->comment_ID . '">Agent Name ' . $comment->comment_author . 'Phone' . $comment->comment_phone . 'Reply' . $comment->comment_content . '</div>';
    echo get_comment_meta( $comment->comment_ID, 'agents_condition', true );
endforeach;