Index: src/applications/herald/adapter/HeraldCommitAdapter.php
===================================================================
--- src/applications/herald/adapter/HeraldCommitAdapter.php
+++ src/applications/herald/adapter/HeraldCommitAdapter.php
@@ -64,19 +64,24 @@
     if ($object instanceof PhabricatorRepository) {
       return true;
     }
+    if ($object instanceof PhabricatorProject) {
+      return true;
+    }
     return false;
   }
 
   public function getTriggerObjectPHIDs() {
-    return array(
-      $this->repository->getPHID(),
-      $this->getPHID(),
-    );
+    return array_merge(
+      array(
+        $this->repository->getPHID(),
+        $this->getPHID(),
+      ),
+      $this->repository->getProjectPHIDs());
   }
 
   public function explainValidTriggerObjects() {
     return pht(
-      'This rule can trigger for **repositories**.');
+      'This rule can trigger for **repositories** and **projects**.');
   }
 
   public function getFieldNameMap() {
@@ -95,6 +100,7 @@
         self::FIELD_COMMITTER,
         self::FIELD_REVIEWER,
         self::FIELD_REPOSITORY,
+        self::FIELD_REPOSITORY_PROJECTS,
         self::FIELD_DIFF_FILE,
         self::FIELD_DIFF_CONTENT,
         self::FIELD_DIFF_ADDED_CONTENT,
@@ -177,6 +183,35 @@
     return $object;
   }
 
+  public function setCommit(PhabricatorRepositoryCommit $commit) {
+    $viewer = PhabricatorUser::getOmnipotentUser();
+
+    $repository = id(new PhabricatorRepositoryQuery())
+      ->setViewer($viewer)
+      ->withIDs(array($commit->getRepositoryID()))
+      ->needProjectPHIDs(true)
+      ->executeOne();
+    if (!$repository) {
+      throw new Exception(pht('Unable to load repository!'));
+    }
+
+    $data = id(new PhabricatorRepositoryCommitData())->loadOneWhere(
+      'commitID = %d',
+      $commit->getID());
+    if (!$data) {
+      throw new Exception(pht('Unable to load commit data!'));
+    }
+
+    $this->commit = clone $commit;
+    $this->commit->attachRepository($repository);
+    $this->commit->attachCommitData($data);
+
+    $this->repository = $repository;
+    $this->commitData = $data;
+
+    return $this;
+  }
+
   public function getPHID() {
     return $this->commit->getPHID();
   }
@@ -375,6 +410,8 @@
         return $this->loadAffectedPaths();
       case self::FIELD_REPOSITORY:
         return $this->repository->getPHID();
+      case self::FIELD_REPOSITORY_PROJECTS:
+        return $this->repository->getProjectPHIDs();
       case self::FIELD_DIFF_CONTENT:
         return $this->getDiffContent('*');
       case self::FIELD_DIFF_ADDED_CONTENT:
Index: src/applications/herald/adapter/HeraldDifferentialRevisionAdapter.php
===================================================================
--- src/applications/herald/adapter/HeraldDifferentialRevisionAdapter.php
+++ src/applications/herald/adapter/HeraldDifferentialRevisionAdapter.php
@@ -64,6 +64,7 @@
         self::FIELD_REVIEWERS,
         self::FIELD_CC,
         self::FIELD_REPOSITORY,
+        self::FIELD_REPOSITORY_PROJECTS,
         self::FIELD_DIFF_FILE,
         self::FIELD_DIFF_CONTENT,
         self::FIELD_DIFF_ADDED_CONTENT,
@@ -152,32 +153,36 @@
     if ($this->repository === null) {
       $this->repository = false;
 
-      // TODO: (T603) Implement policy stuff in Herald.
       $viewer = PhabricatorUser::getOmnipotentUser();
+      $repository_phid = null;
 
       $revision = $this->revision;
       if ($revision->getRepositoryPHID()) {
-        $repositories = id(new PhabricatorRepositoryQuery())
+        $repository_phid = $revision->getRepositoryPHID();
+      } else {
+        $repository = id(new DifferentialRepositoryLookup())
           ->setViewer($viewer)
-          ->withPHIDs(array($revision->getRepositoryPHID()))
-          ->execute();
-        if ($repositories) {
-          $this->repository = head($repositories);
-          return $this->repository;
+          ->setDiff($this->diff)
+          ->lookupRepository();
+        if ($repository) {
+          // We want to get the projects for this repository too, so run a
+          // full query for it below.
+          $repository_phid = $repository->getPHID();
         }
       }
 
-      $repository = id(new DifferentialRepositoryLookup())
-        ->setViewer($viewer)
-        ->setDiff($this->diff)
-        ->lookupRepository();
-      if ($repository) {
-        $this->repository = $repository;
-        return $this->repository;
+      if ($repository_phid) {
+        $repository = id(new PhabricatorRepositoryQuery())
+          ->setViewer($viewer)
+          ->withPHIDs(array($repository_phid))
+          ->needProjectPHIDs(true)
+          ->executeOne();
+        if ($repository) {
+          $this->repository = $repository;
+        }
       }
-
-      $repository = false;
     }
+
     return $this->repository;
   }
 
@@ -345,6 +350,12 @@
           return null;
         }
         return $repository->getPHID();
+      case self::FIELD_REPOSITORY_PROJECTS:
+        $repository = $this->loadRepository();
+        if (!$repository) {
+          return null;
+        }
+        return $repository->getProjectPHIDs();
       case self::FIELD_DIFF_CONTENT:
         return $this->loadContentDictionary();
       case self::FIELD_DIFF_ADDED_CONTENT:
Index: src/applications/herald/controller/HeraldTestConsoleController.php
===================================================================
--- src/applications/herald/controller/HeraldTestConsoleController.php
+++ src/applications/herald/controller/HeraldTestConsoleController.php
@@ -39,13 +39,8 @@
               $object,
               $object->loadActiveDiff());
           } else if ($object instanceof PhabricatorRepositoryCommit) {
-            $data = id(new PhabricatorRepositoryCommitData())->loadOneWhere(
-              'commitID = %d',
-              $object->getID());
-            $adapter = HeraldCommitAdapter::newLegacyAdapter(
-              $object->getRepository(),
-              $object,
-              $data);
+            $adapter = id(new HeraldCommitAdapter())
+              ->setCommit($object);
           } else if ($object instanceof ManiphestTask) {
             $adapter = id(new HeraldManiphestTaskAdapter())
               ->setTask($object);
Index: src/applications/herald/storage/HeraldRule.php
===================================================================
--- src/applications/herald/storage/HeraldRule.php
+++ src/applications/herald/storage/HeraldRule.php
@@ -17,7 +17,7 @@
   protected $isDisabled = 0;
   protected $triggerObjectPHID;
 
-  protected $configVersion = 26;
+  protected $configVersion = 27;
 
   // phids for which this rule has been applied
   private $ruleApplied = self::ATTACHABLE;
Index: src/applications/repository/worker/PhabricatorRepositoryCommitHeraldWorker.php
===================================================================
--- src/applications/repository/worker/PhabricatorRepositoryCommitHeraldWorker.php
+++ src/applications/repository/worker/PhabricatorRepositoryCommitHeraldWorker.php
@@ -42,10 +42,8 @@
           'or no longer exists.'));
     }
 
-    $adapter = HeraldCommitAdapter::newLegacyAdapter(
-      $repository,
-      $commit,
-      $data);
+    $adapter = id(new HeraldCommitAdapter())
+      ->setCommit($commit);
 
     $rules = id(new HeraldRuleQuery())
       ->setViewer(PhabricatorUser::getOmnipotentUser())