If I've interpreted the API docs directly, then I should be able to look up works by artist using URLs like:

http://musicbrainz.org/ws/2/artist/cc197bad-dc9c-440d-a5b5-d52ba2e14234?inc=works
http://musicbrainz.org/ws/2/artist/650e7db6-b795-4eb5-a702-5ea2fc46c848?inc=works

I get an error (the same one) for both of these URLs...

Caught exception in MusicBrainz::Server::Controller::WS::2::Artist->artist "Can't use an undefined value as an ARRAY reference at /home/musicbrainz/musicbrainz-server/script/../lib/MusicBrainz/Server/Controller/WS/2/Artist.pm line 107."

Stack trace:
line 107 MusicBrainz::Server::Controller::WS::2::Artist
line 50 MusicBrainz::Server::Controller::WS::2::Artist
line 270 MusicBrainz::Server

Request data:

$VAR1 = {
'query_parameters' =>

{ 'inc' => 'works' }

,
'body_parameters' => {}
};