diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -4588,7 +4588,6 @@
     'PhabricatorRepositoryManagementImportingWorkflow' => 'applications/repository/management/PhabricatorRepositoryManagementImportingWorkflow.php',
     'PhabricatorRepositoryManagementListPathsWorkflow' => 'applications/repository/management/PhabricatorRepositoryManagementListPathsWorkflow.php',
     'PhabricatorRepositoryManagementListWorkflow' => 'applications/repository/management/PhabricatorRepositoryManagementListWorkflow.php',
-    'PhabricatorRepositoryManagementLookupUsersWorkflow' => 'applications/repository/management/PhabricatorRepositoryManagementLookupUsersWorkflow.php',
     'PhabricatorRepositoryManagementMaintenanceWorkflow' => 'applications/repository/management/PhabricatorRepositoryManagementMaintenanceWorkflow.php',
     'PhabricatorRepositoryManagementMarkImportedWorkflow' => 'applications/repository/management/PhabricatorRepositoryManagementMarkImportedWorkflow.php',
     'PhabricatorRepositoryManagementMarkReachableWorkflow' => 'applications/repository/management/PhabricatorRepositoryManagementMarkReachableWorkflow.php',
@@ -11326,7 +11325,6 @@
     'PhabricatorRepositoryManagementImportingWorkflow' => 'PhabricatorRepositoryManagementWorkflow',
     'PhabricatorRepositoryManagementListPathsWorkflow' => 'PhabricatorRepositoryManagementWorkflow',
     'PhabricatorRepositoryManagementListWorkflow' => 'PhabricatorRepositoryManagementWorkflow',
-    'PhabricatorRepositoryManagementLookupUsersWorkflow' => 'PhabricatorRepositoryManagementWorkflow',
     'PhabricatorRepositoryManagementMaintenanceWorkflow' => 'PhabricatorRepositoryManagementWorkflow',
     'PhabricatorRepositoryManagementMarkImportedWorkflow' => 'PhabricatorRepositoryManagementWorkflow',
     'PhabricatorRepositoryManagementMarkReachableWorkflow' => 'PhabricatorRepositoryManagementWorkflow',
diff --git a/src/applications/repository/management/PhabricatorRepositoryManagementLookupUsersWorkflow.php b/src/applications/repository/management/PhabricatorRepositoryManagementLookupUsersWorkflow.php
deleted file mode 100644
--- a/src/applications/repository/management/PhabricatorRepositoryManagementLookupUsersWorkflow.php
+++ /dev/null
@@ -1,115 +0,0 @@
-<?php
-
-final class PhabricatorRepositoryManagementLookupUsersWorkflow
-  extends PhabricatorRepositoryManagementWorkflow {
-
-  protected function didConstruct() {
-    $this
-      ->setName('lookup-users')
-      ->setExamples('**lookup-users** __commit__ ...')
-      ->setSynopsis(
-        pht('Resolve user accounts for users attached to __commit__.'))
-      ->setArguments(
-        array(
-          array(
-            'name'        => 'commits',
-            'wildcard'    => true,
-          ),
-        ));
-  }
-
-  public function execute(PhutilArgumentParser $args) {
-    $commits = $this->loadCommits($args, 'commits');
-    if (!$commits) {
-      throw new PhutilArgumentUsageException(
-        pht('Specify one or more commits to resolve users for.'));
-    }
-
-    $console = PhutilConsole::getConsole();
-    foreach ($commits as $commit) {
-      $repo = $commit->getRepository();
-      $name =  $repo->formatCommitName($commit->getCommitIdentifier());
-
-      $console->writeOut(
-        "%s\n",
-        pht('Examining commit %s...', $name));
-
-      $refs_raw = DiffusionQuery::callConduitWithDiffusionRequest(
-        $this->getViewer(),
-        DiffusionRequest::newFromDictionary(
-          array(
-            'repository' => $repo,
-            'user' => $this->getViewer(),
-          )),
-        'diffusion.querycommits',
-        array(
-          'repositoryPHID' => $repo->getPHID(),
-          'phids' => array($commit->getPHID()),
-          'bypassCache' => true,
-        ));
-
-      if (empty($refs_raw['data'])) {
-        throw new Exception(
-          pht(
-            'Unable to retrieve details for commit "%s"!',
-            $commit->getPHID()));
-      }
-
-      $ref = DiffusionCommitRef::newFromConduitResult(head($refs_raw['data']));
-
-      $author = $ref->getAuthor();
-      $console->writeOut(
-        "%s\n",
-        pht('Raw author string: %s', coalesce($author, 'null')));
-
-      if ($author !== null) {
-        $handle = $this->resolveUser($commit, $author);
-        if ($handle) {
-          $console->writeOut(
-            "%s\n",
-            pht('Phabricator user: %s', $handle->getFullName()));
-        } else {
-          $console->writeOut(
-            "%s\n",
-            pht('Unable to resolve a corresponding Phabricator user.'));
-        }
-      }
-
-      $committer = $ref->getCommitter();
-      $console->writeOut(
-        "%s\n",
-        pht('Raw committer string: %s', coalesce($committer, 'null')));
-
-      if ($committer !== null) {
-        $handle = $this->resolveUser($commit, $committer);
-        if ($handle) {
-          $console->writeOut(
-            "%s\n",
-            pht('Phabricator user: %s', $handle->getFullName()));
-        } else {
-          $console->writeOut(
-            "%s\n",
-            pht('Unable to resolve a corresponding Phabricator user.'));
-        }
-      }
-    }
-
-    return 0;
-  }
-
-  private function resolveUser(PhabricatorRepositoryCommit $commit, $name) {
-    $phid = id(new DiffusionResolveUserQuery())
-      ->withName($name)
-      ->execute();
-
-    if (!$phid) {
-      return null;
-    }
-
-    return id(new PhabricatorHandleQuery())
-      ->setViewer($this->getViewer())
-      ->withPHIDs(array($phid))
-      ->executeOne();
-  }
-
-}