diff --git a/src/applications/herald/adapter/HeraldAdapter.php b/src/applications/herald/adapter/HeraldAdapter.php
index fe047ae428..a478284231 100644
--- a/src/applications/herald/adapter/HeraldAdapter.php
+++ b/src/applications/herald/adapter/HeraldAdapter.php
@@ -243,6 +243,22 @@ abstract class HeraldAdapter {
     return $this->queuedTransactions;
   }
 
+  protected function newTransaction() {
+    $object = $this->getObject();
+
+    if (!($object instanceof PhabricatorApplicationTransactionInterface)) {
+      throw new Exception(
+        pht(
+          'Unable to build a new transaction for adapter object; it does '.
+          'not implement "%s".',
+          'PhabricatorApplicationTransactionInterface'));
+    }
+
+    return $object->getApplicationTransactionTemplate();
+  }
+
+
+
 
   /**
    * NOTE: You generally should not override this; it exists to support legacy
@@ -1482,7 +1498,21 @@ abstract class HeraldAdapter {
   protected function applyStandardEffect(HeraldEffect $effect) {
     $action = $effect->getAction();
 
+    $rule_type = $effect->getRule()->getRuleType();
+    $supported = $this->getActions($rule_type);
+    $supported = array_fuse($supported);
+    if (empty($supported[$action])) {
+      throw new Exception(
+        pht(
+          'Adapter "%s" does not support action "%s" for rule type "%s".',
+          get_class($this),
+          $action,
+          $rule_type));
+    }
+
     switch ($action) {
+      case self::ACTION_ADD_PROJECTS:
+        return $this->applyProjectsEffect($effect);
       case self::ACTION_FLAG:
         return $this->applyFlagEffect($effect);
       case self::ACTION_EMAIL:
@@ -1504,6 +1534,32 @@ abstract class HeraldAdapter {
   }
 
 
+  /**
+   * @task apply
+   */
+  private function applyProjectsEffect(HeraldEffect $effect) {
+
+    $kind = '+';
+
+    $project_type = PhabricatorProjectObjectHasProjectEdgeType::EDGECONST;
+    $project_phids = $effect->getTarget();
+    $xaction = $this->newTransaction()
+      ->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
+      ->setMetadataValue('edge:type', $project_type)
+      ->setNewValue(
+        array(
+          $kind => array_fuse($project_phids),
+        ));
+
+    $this->queueTransaction($xaction);
+
+    return new HeraldApplyTranscript(
+      $effect,
+      true,
+      pht('Added projects.'));
+  }
+
+
   /**
    * @task apply
    */
diff --git a/src/applications/herald/adapter/HeraldManiphestTaskAdapter.php b/src/applications/herald/adapter/HeraldManiphestTaskAdapter.php
index e49aa73f67..f25d5fa296 100644
--- a/src/applications/herald/adapter/HeraldManiphestTaskAdapter.php
+++ b/src/applications/herald/adapter/HeraldManiphestTaskAdapter.php
@@ -5,7 +5,6 @@ final class HeraldManiphestTaskAdapter extends HeraldAdapter {
   private $task;
   private $ccPHIDs = array();
   private $assignPHID;
-  private $projectPHIDs = array();
 
   public function getAdapterApplicationClass() {
     return 'PhabricatorManiphestApplication';
@@ -61,14 +60,6 @@ final class HeraldManiphestTaskAdapter extends HeraldAdapter {
     return $this->assignPHID;
   }
 
-  public function setProjectPHIDs(array $project_phids) {
-    $this->projectPHIDs = $project_phids;
-    return $this;
-  }
-  public function getProjectPHIDs() {
-    return $this->projectPHIDs;
-  }
-
   public function getAdapterContentName() {
     return pht('Maniphest Tasks');
   }
@@ -181,15 +172,6 @@ final class HeraldManiphestTaskAdapter extends HeraldAdapter {
             true,
             pht('Assigned task.'));
           break;
-        case self::ACTION_ADD_PROJECTS:
-          foreach ($effect->getTarget() as $phid) {
-            $this->projectPHIDs[] = $phid;
-          }
-          $result[] = new HeraldApplyTranscript(
-            $effect,
-            true,
-            pht('Added projects.'));
-          break;
         default:
           $result[] = $this->applyStandardEffect($effect);
           break;
diff --git a/src/applications/maniphest/editor/ManiphestTransactionEditor.php b/src/applications/maniphest/editor/ManiphestTransactionEditor.php
index 54f75adbb8..0b733baf27 100644
--- a/src/applications/maniphest/editor/ManiphestTransactionEditor.php
+++ b/src/applications/maniphest/editor/ManiphestTransactionEditor.php
@@ -525,18 +525,6 @@ final class ManiphestTransactionEditor
         ->setNewValue($assign_phid);
     }
 
-    $project_phids = $adapter->getProjectPHIDs();
-    if ($project_phids) {
-      $project_type = PhabricatorProjectObjectHasProjectEdgeType::EDGECONST;
-      $xactions[] = id(new ManiphestTransaction())
-        ->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
-        ->setMetadataValue('edge:type', $project_type)
-        ->setNewValue(
-          array(
-            '+' => array_fuse($project_phids),
-          ));
-    }
-
     return $xactions;
   }