name is a required field of HarbormasterBuildLintMessage objects, but not all linters set a Name field on the lint feedback they produce. This leads to errors during arc diff:
[2015-09-02 00:42:16] EXCEPTION: (ConduitClientException) ERR-CONDUIT-CORE: Missing required parameters: name at [<phutil>/src/conduit/ConduitFuture.php:58] arcanist(head=master, ref.master=a5304e472d18), dblib(), phutil(head=master, ref.master=dc0626970a6d) #0 <#2> ConduitFuture::didReceiveResult(array) called at [<phutil>/src/future/FutureProxy.php:58] #1 <#2> FutureProxy::getResult() called at [<phutil>/src/future/FutureProxy.php:35] #2 <#2> FutureProxy::resolve() called at [<arcanist>/src/workflow/ArcanistDiffWorkflow.php:2778] #3 phlog(ConduitClientException) called at [<arcanist>/src/workflow/ArcanistDiffWorkflow.php:2784] #4 ArcanistDiffWorkflow::updateAutotargets(string, integer) called at [<arcanist>/src/workflow/ArcanistDiffWorkflow.php:528] #5 ArcanistDiffWorkflow::run() called at [<arcanist>/scripts/arcanist.php:382]
The quick fix is likely to replace setDescription calls with setName calls on linters that only have the latter. I'm happy to provide a diff that does so, if that's an acceptable solution.