Maybe there is an error? The AnyEvent::i3 documentation mentions that ->command returns a result:

use Data::Dumper;
sub handle {
  my($data)=@_;

  if($data->{change} eq "empty") {
    print "empty workspace!!\n";
    my $switched; $switched = $i3->command("workspace 1")->cb(sub {
        my( $reply ) = @_;
        print "Switched back to workspace 1\n";
        undef $switched;
        use Data::Dumper;
        print Dumper $reply;
    });
  }
}

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In reply to Re^3: scripting i3 with Perl by Corion
in thread scripting i3 with Perl by morgon

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