diff --git a/src/applications/herald/adapter/HeraldAdapter.php b/src/applications/herald/adapter/HeraldAdapter.php
--- a/src/applications/herald/adapter/HeraldAdapter.php
+++ b/src/applications/herald/adapter/HeraldAdapter.php
@@ -29,6 +29,7 @@
   private $contentSource;
   private $isNewObject;
   private $applicationEmail;
+  private $appliedTransactions = array();
   private $queuedTransactions = array();
   private $emailPHIDs = array();
   private $forcedEmailPHIDs = array();
@@ -121,6 +122,36 @@
     return !empty($applications);
   }
 
+
+  /**
+   * Set the list of transactions which just took effect.
+   *
+   * These transactions are set by @{class:PhabricatorApplicationEditor}
+   * automatically, before it invokes Herald.
+   *
+   * @param list<PhabricatorApplicationTransaction> List of transactions.
+   * @return this
+   */
+  final public function setAppliedTransactions(array $xactions) {
+    assert_instances_of($xactions, 'PhabricatorApplicationTransaction');
+    $this->appliedTransactions = $xactions;
+    return $this;
+  }
+
+
+  /**
+   * Get a list of transactions which just took effect.
+   *
+   * When an object is edited normally, transactions are applied and then
+   * Herald executes. You can call this method to examine the transactions
+   * if you want to react to them.
+   *
+   * @return list<PhabricatorApplicationTransaction> List of transactions.
+   */
+  final public function getAppliedTransactions() {
+    return $this->appliedTransactions;
+  }
+
   public function queueTransaction($transaction) {
     $this->queuedTransactions[] = $transaction;
   }
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
@@ -2867,12 +2867,15 @@
     PhabricatorLiskDAO $object,
     array $xactions) {
 
-    $adapter = $this->buildHeraldAdapter($object, $xactions);
-    $adapter->setContentSource($this->getContentSource());
-    $adapter->setIsNewObject($this->getIsNewObject());
+    $adapter = $this->buildHeraldAdapter($object, $xactions)
+      ->setContentSource($this->getContentSource())
+      ->setIsNewObject($this->getIsNewObject())
+      ->setAppliedTransactions($xactions);
+
     if ($this->getApplicationEmail()) {
       $adapter->setApplicationEmail($this->getApplicationEmail());
     }
+
     $xscript = HeraldEngine::loadAndApplyRules($adapter);
 
     $this->setHeraldAdapter($adapter);