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
@@ -1426,6 +1426,7 @@
     'MultimeterViewer' => 'applications/multimeter/storage/MultimeterViewer.php',
     'NuanceConduitAPIMethod' => 'applications/nuance/conduit/NuanceConduitAPIMethod.php',
     'NuanceConsoleController' => 'applications/nuance/controller/NuanceConsoleController.php',
+    'NuanceContentSource' => 'applications/nuance/contentsource/NuanceContentSource.php',
     'NuanceController' => 'applications/nuance/controller/NuanceController.php',
     'NuanceDAO' => 'applications/nuance/storage/NuanceDAO.php',
     'NuanceGitHubEventItemType' => 'applications/nuance/item/NuanceGitHubEventItemType.php',
@@ -5726,6 +5727,7 @@
     'MultimeterViewer' => 'MultimeterDimension',
     'NuanceConduitAPIMethod' => 'ConduitAPIMethod',
     'NuanceConsoleController' => 'NuanceController',
+    'NuanceContentSource' => 'PhabricatorContentSource',
     'NuanceController' => 'PhabricatorController',
     'NuanceDAO' => 'PhabricatorLiskDAO',
     'NuanceGitHubEventItemType' => 'NuanceItemType',
diff --git a/src/applications/nuance/contentsource/NuanceContentSource.php b/src/applications/nuance/contentsource/NuanceContentSource.php
new file mode 100644
--- /dev/null
+++ b/src/applications/nuance/contentsource/NuanceContentSource.php
@@ -0,0 +1,16 @@
+<?php
+
+final class NuanceContentSource
+  extends PhabricatorContentSource {
+
+  const SOURCECONST = 'nuance';
+
+  public function getSourceName() {
+    return pht('Nuance');
+  }
+
+  public function getSourceDescription() {
+    return pht('Content imported via Nuance.');
+  }
+
+}
diff --git a/src/applications/nuance/item/NuanceGitHubEventItemType.php b/src/applications/nuance/item/NuanceGitHubEventItemType.php
--- a/src/applications/nuance/item/NuanceGitHubEventItemType.php
+++ b/src/applications/nuance/item/NuanceGitHubEventItemType.php
@@ -297,7 +297,7 @@
           $xobj_phid));
     }
 
-    $nuance_phid = id(new PhabricatorNuanceApplication())->getPHID();
+    $acting_as_phid = $this->getActingAsPHID($item);
 
     $xactions = array();
 
@@ -307,7 +307,7 @@
       ->executeOne();
     if (!$task) {
       $task = ManiphestTask::initializeNewTask($viewer)
-        ->setAuthorPHID($nuance_phid)
+        ->setAuthorPHID($acting_as_phid)
         ->setBridgedObjectPHID($xobj_phid);
 
       $title = $xobj->getProperty('task.title');
@@ -344,16 +344,12 @@
             ->setContent($comment));
     }
 
-    // TODO: Preserve the item's original source.
-    $source = PhabricatorContentSource::newForSource(
-      PhabricatorDaemonContentSource::SOURCECONST);
-
-    // TODO: This should really be the external source.
-    $acting_phid = $nuance_phid;
+    $agent_phid = $command->getAuthorPHID();
+    $source = $this->newContentSource($item, $agent_phid);
 
     $editor = id(new ManiphestTransactionEditor())
       ->setActor($viewer)
-      ->setActingAsPHID($acting_phid)
+      ->setActingAsPHID($acting_as_phid)
       ->setContentSource($source)
       ->setContinueOnNoEffect(true)
       ->setContinueOnMissingFields(true);
@@ -366,5 +362,10 @@
     );
   }
 
+  protected function getActingAsPHID(NuanceItem $item) {
+    // TODO: This should be an external account PHID representing the original
+    // GitHub user.
+    return parent::getActingAsPHID($item);
+  }
 
 }
diff --git a/src/applications/nuance/item/NuanceItemType.php b/src/applications/nuance/item/NuanceItemType.php
--- a/src/applications/nuance/item/NuanceItemType.php
+++ b/src/applications/nuance/item/NuanceItemType.php
@@ -144,4 +144,19 @@
     return null;
   }
 
+  final protected function newContentSource(
+    NuanceItem $item,
+    $agent_phid) {
+    return PhabricatorContentSource::newForSource(
+      NuanceContentSource::SOURCECONST,
+      array(
+        'itemPHID' => $item->getPHID(),
+        'agentPHID' => $agent_phid,
+      ));
+  }
+
+  protected function getActingAsPHID(NuanceItem $item) {
+    return id(new PhabricatorNuanceApplication())->getPHID();
+  }
+
 }