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
@@ -3670,6 +3670,7 @@
       'PhabricatorCustomFieldInterface',
       'PhabricatorDestructibleInterface',
       'PhabricatorApplicationTransactionInterface',
+      'PhabricatorProjectInterface',
     ),
     'ManiphestTaskDescriptionPreviewController' => 'ManiphestController',
     'ManiphestTaskDetailController' => 'ManiphestController',
diff --git a/src/applications/maniphest/controller/ManiphestTaskDetailController.php b/src/applications/maniphest/controller/ManiphestTaskDetailController.php
--- a/src/applications/maniphest/controller/ManiphestTaskDetailController.php
+++ b/src/applications/maniphest/controller/ManiphestTaskDetailController.php
@@ -530,52 +530,6 @@
           $source));
     }
 
-    $project_phids = $task->getProjectPHIDs();
-    if ($project_phids) {
-      require_celerity_resource('maniphest-task-summary-css');
-
-      $positions = id(new PhabricatorProjectColumnPositionQuery())
-        ->setViewer($viewer)
-        ->withBoardPHIDs($project_phids)
-        ->withObjectPHIDs(array($task->getPHID()))
-        ->needColumns(true)
-        ->execute();
-      $positions = mpull($positions, null, 'getBoardPHID');
-
-      $project_handles = array();
-      $project_annotations = array();
-      foreach ($project_phids as $project_phid) {
-        $handle = $this->getHandle($project_phid);
-        $project_handles[] = $handle;
-
-        $position = idx($positions, $project_phid);
-        if ($position) {
-          $column = $position->getColumn();
-
-          $column_name = pht('(%s)', $column->getDisplayName());
-          $column_link = phutil_tag(
-            'a',
-            array(
-              'href' => $handle->getURI().'board/',
-              'class' => 'maniphest-board-link',
-            ),
-            $column_name);
-
-          $project_annotations[$project_phid] = array(
-            ' ',
-            $column_link);
-        }
-      }
-
-      $project_rows = id(new PHUIHandleTagListView())
-        ->setHandles($project_handles)
-        ->setAnnotations($project_annotations);
-    } else {
-      $project_rows = phutil_tag('em', array(), pht('None'));
-    }
-
-    $view->addProperty(pht('Projects'), $project_rows);
-
     $edge_types = array(
       PhabricatorEdgeConfig::TYPE_TASK_DEPENDED_ON_BY_TASK
         => pht('Blocks'),
diff --git a/src/applications/maniphest/storage/ManiphestTask.php b/src/applications/maniphest/storage/ManiphestTask.php
--- a/src/applications/maniphest/storage/ManiphestTask.php
+++ b/src/applications/maniphest/storage/ManiphestTask.php
@@ -9,7 +9,8 @@
     PhrequentTrackableInterface,
     PhabricatorCustomFieldInterface,
     PhabricatorDestructibleInterface,
-    PhabricatorApplicationTransactionInterface {
+    PhabricatorApplicationTransactionInterface,
+    PhabricatorProjectInterface {
 
   const MARKUP_FIELD_DESCRIPTION = 'markup:desc';
 
diff --git a/src/applications/project/events/PhabricatorProjectUIEventListener.php b/src/applications/project/events/PhabricatorProjectUIEventListener.php
--- a/src/applications/project/events/PhabricatorProjectUIEventListener.php
+++ b/src/applications/project/events/PhabricatorProjectUIEventListener.php
@@ -42,9 +42,54 @@
       $handles = array();
     }
 
+    // If this object can appear on boards, build the workboard annotations.
+    // Some day, this might be a generic interface. For now, only tasks can
+    // appear on boards.
+    $can_appear_on_boards = ($object instanceof ManiphestTask);
+
+    $annotations = array();
+    if ($handles && $can_appear_on_boards) {
+
+      // TDOO: Generalize this UI and move it out of Maniphest.
+
+      require_celerity_resource('maniphest-task-summary-css');
+
+      $positions = id(new PhabricatorProjectColumnPositionQuery())
+        ->setViewer($user)
+        ->withBoardPHIDs($project_phids)
+        ->withObjectPHIDs(array($object->getPHID()))
+        ->needColumns(true)
+        ->execute();
+      $positions = mpull($positions, null, 'getBoardPHID');
+
+      foreach ($project_phids as $project_phid) {
+        $handle = $handles[$project_phid];
+
+        $position = idx($positions, $project_phid);
+        if ($position) {
+          $column = $position->getColumn();
+
+          $column_name = pht('(%s)', $column->getDisplayName());
+          $column_link = phutil_tag(
+            'a',
+            array(
+              'href' => $handle->getURI().'board/',
+              'class' => 'maniphest-board-link',
+            ),
+            $column_name);
+
+          $annotations[$project_phid] = array(
+            ' ',
+            $column_link);
+        }
+      }
+
+    }
+
     if ($handles) {
       $list = id(new PHUIHandleTagListView())
-        ->setHandles($handles);
+        ->setHandles($handles)
+        ->setAnnotations($annotations);
     } else {
       $list = phutil_tag('em', array(), pht('None'));
     }
diff --git a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
--- a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
+++ b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
@@ -1959,18 +1959,10 @@
       $has_support = true;
     }
 
-    // TODO: The Maniphest legacy stuff should get cleaned up here.
-
-    if (($object instanceof ManiphestTask) ||
-        ($object instanceof PhabricatorProjectInterface)) {
-
-      if ($object instanceof PhabricatorProjectInterface) {
-        $project_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
-          $object->getPHID(),
-          PhabricatorProjectObjectHasProjectEdgeType::EDGECONST);
-      } else {
-        $project_phids = $object->getProjectPHIDs();
-      }
+    if ($object instanceof PhabricatorProjectInterface) {
+      $project_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
+        $object->getPHID(),
+        PhabricatorProjectObjectHasProjectEdgeType::EDGECONST);
 
       if ($project_phids) {
         $watcher_type = PhabricatorEdgeConfig::TYPE_OBJECT_HAS_WATCHER;