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
@@ -1524,6 +1524,7 @@
     'HarbormasterManagementUpdateWorkflow' => 'applications/harbormaster/management/HarbormasterManagementUpdateWorkflow.php',
     'HarbormasterManagementWorkflow' => 'applications/harbormaster/management/HarbormasterManagementWorkflow.php',
     'HarbormasterManagementWriteLogWorkflow' => 'applications/harbormaster/management/HarbormasterManagementWriteLogWorkflow.php',
+    'HarbormasterMessageException' => 'applications/harbormaster/exception/HarbormasterMessageException.php',
     'HarbormasterMessageType' => 'applications/harbormaster/engine/HarbormasterMessageType.php',
     'HarbormasterObject' => 'applications/harbormaster/storage/HarbormasterObject.php',
     'HarbormasterOtherBuildStepGroup' => 'applications/harbormaster/stepgroup/HarbormasterOtherBuildStepGroup.php',
@@ -1541,7 +1542,6 @@
     'HarbormasterQueryBuildsConduitAPIMethod' => 'applications/harbormaster/conduit/HarbormasterQueryBuildsConduitAPIMethod.php',
     'HarbormasterQueryBuildsSearchEngineAttachment' => 'applications/harbormaster/engineextension/HarbormasterQueryBuildsSearchEngineAttachment.php',
     'HarbormasterRemarkupRule' => 'applications/harbormaster/remarkup/HarbormasterRemarkupRule.php',
-    'HarbormasterRestartException' => 'applications/harbormaster/exception/HarbormasterRestartException.php',
     'HarbormasterRunBuildPlansHeraldAction' => 'applications/harbormaster/herald/HarbormasterRunBuildPlansHeraldAction.php',
     'HarbormasterSchemaSpec' => 'applications/harbormaster/storage/HarbormasterSchemaSpec.php',
     'HarbormasterScratchTable' => 'applications/harbormaster/storage/HarbormasterScratchTable.php',
@@ -7784,6 +7784,7 @@
     'HarbormasterManagementUpdateWorkflow' => 'HarbormasterManagementWorkflow',
     'HarbormasterManagementWorkflow' => 'PhabricatorManagementWorkflow',
     'HarbormasterManagementWriteLogWorkflow' => 'HarbormasterManagementWorkflow',
+    'HarbormasterMessageException' => 'Exception',
     'HarbormasterMessageType' => 'Phobject',
     'HarbormasterObject' => 'HarbormasterDAO',
     'HarbormasterOtherBuildStepGroup' => 'HarbormasterBuildStepGroup',
@@ -7801,7 +7802,6 @@
     'HarbormasterQueryBuildsConduitAPIMethod' => 'HarbormasterConduitAPIMethod',
     'HarbormasterQueryBuildsSearchEngineAttachment' => 'PhabricatorSearchEngineAttachment',
     'HarbormasterRemarkupRule' => 'PhabricatorObjectRemarkupRule',
-    'HarbormasterRestartException' => 'Exception',
     'HarbormasterRunBuildPlansHeraldAction' => 'HeraldAction',
     'HarbormasterSchemaSpec' => 'PhabricatorConfigSchemaSpec',
     'HarbormasterScratchTable' => 'HarbormasterDAO',
diff --git a/src/applications/harbormaster/controller/HarbormasterBuildActionController.php b/src/applications/harbormaster/controller/HarbormasterBuildActionController.php
--- a/src/applications/harbormaster/controller/HarbormasterBuildActionController.php
+++ b/src/applications/harbormaster/controller/HarbormasterBuildActionController.php
@@ -41,7 +41,7 @@
 
     try {
       $xaction->assertCanSendMessage($viewer, $build);
-    } catch (HarbormasterRestartException $ex) {
+    } catch (HarbormasterMessageException $ex) {
       return $this->newDialog()
         ->setTitle($ex->getTitle())
         ->appendChild($ex->getBody())
diff --git a/src/applications/harbormaster/controller/HarbormasterBuildableActionController.php b/src/applications/harbormaster/controller/HarbormasterBuildableActionController.php
--- a/src/applications/harbormaster/controller/HarbormasterBuildableActionController.php
+++ b/src/applications/harbormaster/controller/HarbormasterBuildableActionController.php
@@ -43,7 +43,7 @@
       try {
         $message->assertCanSendMessage($viewer, $build);
         $can_send[$key] = $build;
-      } catch (HarbormasterRestartException $ex) {
+      } catch (HarbormasterMessageException $ex) {
         $exception = $ex;
       }
 
diff --git a/src/applications/harbormaster/exception/HarbormasterRestartException.php b/src/applications/harbormaster/exception/HarbormasterMessageException.php
rename from src/applications/harbormaster/exception/HarbormasterRestartException.php
rename to src/applications/harbormaster/exception/HarbormasterMessageException.php
--- a/src/applications/harbormaster/exception/HarbormasterRestartException.php
+++ b/src/applications/harbormaster/exception/HarbormasterMessageException.php
@@ -1,6 +1,6 @@
 <?php
 
-final class HarbormasterRestartException extends Exception {
+final class HarbormasterMessageException extends Exception {
 
   private $title;
   private $body = array();
diff --git a/src/applications/harbormaster/management/HarbormasterManagementRestartWorkflow.php b/src/applications/harbormaster/management/HarbormasterManagementRestartWorkflow.php
--- a/src/applications/harbormaster/management/HarbormasterManagementRestartWorkflow.php
+++ b/src/applications/harbormaster/management/HarbormasterManagementRestartWorkflow.php
@@ -70,7 +70,7 @@
 
       try {
         $message->assertCanSendMessage($viewer, $build);
-      } catch (HarbormasterRestartException $ex) {
+      } catch (HarbormasterMessageException $ex) {
         $this->logWarn(
           pht('INVALID'),
           $ex->newDisplayString());
diff --git a/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageAbortTransaction.php b/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageAbortTransaction.php
--- a/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageAbortTransaction.php
+++ b/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageAbortTransaction.php
@@ -88,14 +88,14 @@
     HarbormasterBuild $build) {
 
     if ($build->isAutobuild()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Abort Build'),
         pht(
           'You can not abort a build that uses an autoplan.'));
     }
 
     if ($build->isComplete()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Abort Build'),
         pht(
           'You can not abort this biuld because it is already complete.'));
@@ -107,7 +107,7 @@
     HarbormasterBuild $build) {
 
     if ($build->isAborting()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Abort Build'),
         pht(
           'You can not abort this build because it is already aborting.'));
diff --git a/src/applications/harbormaster/xaction/build/HarbormasterBuildMessagePauseTransaction.php b/src/applications/harbormaster/xaction/build/HarbormasterBuildMessagePauseTransaction.php
--- a/src/applications/harbormaster/xaction/build/HarbormasterBuildMessagePauseTransaction.php
+++ b/src/applications/harbormaster/xaction/build/HarbormasterBuildMessagePauseTransaction.php
@@ -83,19 +83,19 @@
     HarbormasterBuild $build) {
 
     if ($build->isAutobuild()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Pause Build'),
         pht('You can not pause a build that uses an autoplan.'));
     }
 
     if ($build->isPaused()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Pause Build'),
         pht('You can not pause this build because it is already paused.'));
     }
 
     if ($build->isComplete()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Pause Build'),
         pht('You can not pause this build because it has already completed.'));
     }
@@ -106,19 +106,19 @@
     HarbormasterBuild $build) {
 
     if ($build->isPausing()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Pause Build'),
         pht('You can not pause this build because it is already pausing.'));
     }
 
     if ($build->isRestarting()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Pause Build'),
         pht('You can not pause this build because it is already restarting.'));
     }
 
     if ($build->isAborting()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Pause Build'),
         pht('You can not pause this build because it is already aborting.'));
     }
diff --git a/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageRestartTransaction.php b/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageRestartTransaction.php
--- a/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageRestartTransaction.php
+++ b/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageRestartTransaction.php
@@ -105,7 +105,7 @@
     HarbormasterBuild $build) {
 
     if ($build->isAutobuild()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Can Not Restart Autobuild'),
         pht(
           'This build can not be restarted because it is an automatic '.
@@ -118,7 +118,7 @@
     // See T13526. Users who can't see the "BuildPlan" can end up here with
     // no object. This is highly questionable.
     if (!$plan) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('No Build Plan Permission'),
         pht(
           'You can not restart this build because you do not have '.
@@ -132,7 +132,7 @@
     $never_restartable = HarbormasterBuildPlanBehavior::RESTARTABLE_NEVER;
     $is_never = ($option_key === $never_restartable);
     if ($is_never) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Build Plan Prevents Restart'),
         pht(
           'This build can not be restarted because the build plan is '.
@@ -143,7 +143,7 @@
     $is_failed = ($option_key === $failed_restartable);
     if ($is_failed) {
       if (!$this->isFailed()) {
-        throw new HarbormasterRestartException(
+        throw new HarbormasterMessageException(
           pht('Only Restartable if Failed'),
           pht(
             'This build can not be restarted because the build plan is '.
@@ -159,7 +159,7 @@
     HarbormasterBuild $build) {
 
     if ($build->isRestarting()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Already Restarting'),
         pht(
           'This build is already restarting. You can not reissue a restart '.
diff --git a/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageResumeTransaction.php b/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageResumeTransaction.php
--- a/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageResumeTransaction.php
+++ b/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageResumeTransaction.php
@@ -75,14 +75,14 @@
     HarbormasterBuild $build) {
 
     if ($build->isAutobuild()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Resume Build'),
         pht(
           'You can not resume a build that uses an autoplan.'));
     }
 
     if (!$build->isPaused() && !$build->isPausing()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Resume Build'),
         pht(
           'You can not resume this build because it is not paused. You can '.
@@ -96,20 +96,20 @@
     HarbormasterBuild $build) {
 
     if ($build->isResuming()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Resume Build'),
         pht(
           'You can not resume this build beacuse it is already resuming.'));
     }
 
     if ($build->isRestarting()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Resume Build'),
         pht('You can not resume this build because it is already restarting.'));
     }
 
     if ($build->isAborting()) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('Unable to Resume Build'),
         pht('You can not resume this build because it is already aborting.'));
     }
diff --git a/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageTransaction.php b/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageTransaction.php
--- a/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageTransaction.php
+++ b/src/applications/harbormaster/xaction/build/HarbormasterBuildMessageTransaction.php
@@ -86,7 +86,7 @@
     try {
       $this->assertCanApplyMessage($viewer, $build);
       return true;
-    } catch (HarbormasterRestartException $ex) {
+    } catch (HarbormasterMessageException $ex) {
       return false;
     }
   }
@@ -98,7 +98,7 @@
     try {
       $this->assertCanSendMessage($viewer, $build);
       return true;
-    } catch (HarbormasterRestartException $ex) {
+    } catch (HarbormasterMessageException $ex) {
       return false;
     }
   }
@@ -117,7 +117,7 @@
     // See T13526. Users without permission to access the build plan can
     // currently end up here with no "BuildPlan" object.
     if (!$plan) {
-      throw new HarbormasterRestartException(
+      throw new HarbormasterMessageException(
         pht('No Build Plan Permission'),
         pht(
           'You can not issue this command because you do not have '.
@@ -133,7 +133,7 @@
           $plan,
           PhabricatorPolicyCapability::CAN_EDIT);
       } catch (PhabricatorPolicyException $ex) {
-        throw new HarbormasterRestartException(
+        throw new HarbormasterMessageException(
           pht('Insufficent Build Plan Permission'),
           pht(
             'The build plan for this build is configured to prevent '.