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
@@ -92,7 +92,6 @@
     'AphrontView' => 'view/AphrontView.php',
     'AphrontWebpageResponse' => 'aphront/response/AphrontWebpageResponse.php',
     'AuditActionMenuEventListener' => 'applications/audit/events/AuditActionMenuEventListener.php',
-    'BuildStepImplementation' => 'applications/harbormaster/step/BuildStepImplementation.php',
     'CalendarColors' => 'applications/calendar/constants/CalendarColors.php',
     'CalendarConstants' => 'applications/calendar/constants/CalendarConstants.php',
     'CalendarTimeUtil' => 'applications/calendar/util/CalendarTimeUtil.php',
@@ -715,6 +714,7 @@
     'HarbormasterBuildStepCoreCustomField' => 'applications/harbormaster/customfield/HarbormasterBuildStepCoreCustomField.php',
     'HarbormasterBuildStepCustomField' => 'applications/harbormaster/customfield/HarbormasterBuildStepCustomField.php',
     'HarbormasterBuildStepEditor' => 'applications/harbormaster/editor/HarbormasterBuildStepEditor.php',
+    'HarbormasterBuildStepImplementation' => 'applications/harbormaster/step/HarbormasterBuildStepImplementation.php',
     'HarbormasterBuildStepQuery' => 'applications/harbormaster/query/HarbormasterBuildStepQuery.php',
     'HarbormasterBuildStepTransaction' => 'applications/harbormaster/storage/configuration/HarbormasterBuildStepTransaction.php',
     'HarbormasterBuildStepTransactionQuery' => 'applications/harbormaster/query/HarbormasterBuildStepTransactionQuery.php',
@@ -2663,7 +2663,7 @@
     'CelerityResourceGraph' => 'AbstractDirectedGraph',
     'CelerityResourceTransformerTestCase' => 'PhabricatorTestCase',
     'CelerityResourcesOnDisk' => 'CelerityPhysicalResources',
-    'CommandBuildStepImplementation' => 'BuildStepImplementation',
+    'CommandBuildStepImplementation' => 'HarbormasterBuildStepImplementation',
     'ConduitAPIMethod' =>
     array(
       0 => 'Phobject',
@@ -3353,7 +3353,7 @@
     'HarbormasterCapabilityManagePlans' => 'PhabricatorPolicyCapability',
     'HarbormasterController' => 'PhabricatorController',
     'HarbormasterDAO' => 'PhabricatorLiskDAO',
-    'HarbormasterHTTPRequestBuildStepImplementation' => 'BuildStepImplementation',
+    'HarbormasterHTTPRequestBuildStepImplementation' => 'HarbormasterBuildStepImplementation',
     'HarbormasterManagementBuildWorkflow' => 'HarbormasterManagementWorkflow',
     'HarbormasterManagementWorkflow' => 'PhabricatorManagementWorkflow',
     'HarbormasterObject' => 'HarbormasterDAO',
@@ -3381,7 +3381,7 @@
     'HarbormasterStepDeleteController' => 'HarbormasterController',
     'HarbormasterStepEditController' => 'HarbormasterController',
     'HarbormasterTargetWorker' => 'HarbormasterWorker',
-    'HarbormasterThrowExceptionBuildStep' => 'BuildStepImplementation',
+    'HarbormasterThrowExceptionBuildStep' => 'HarbormasterBuildStepImplementation',
     'HarbormasterUIEventListener' => 'PhabricatorEventListener',
     'HarbormasterWorker' => 'PhabricatorWorker',
     'HeraldAction' => 'HeraldDAO',
@@ -3448,7 +3448,7 @@
     'JavelinUIExample' => 'PhabricatorUIExample',
     'JavelinViewExample' => 'PhabricatorUIExample',
     'JavelinViewExampleServerView' => 'AphrontView',
-    'LeaseHostBuildStepImplementation' => 'BuildStepImplementation',
+    'LeaseHostBuildStepImplementation' => 'HarbormasterBuildStepImplementation',
     'LegalpadCapabilityDefaultEdit' => 'PhabricatorPolicyCapability',
     'LegalpadCapabilityDefaultView' => 'PhabricatorPolicyCapability',
     'LegalpadController' => 'PhabricatorController',
@@ -5398,7 +5398,7 @@
     'PonderVoteSaveController' => 'PonderController',
     'ProjectCapabilityCreateProjects' => 'PhabricatorPolicyCapability',
     'ProjectRemarkupRule' => 'PhabricatorRemarkupRuleObject',
-    'PublishFragmentBuildStepImplementation' => 'BuildStepImplementation',
+    'PublishFragmentBuildStepImplementation' => 'HarbormasterBuildStepImplementation',
     'QueryFormattingTestCase' => 'PhabricatorTestCase',
     'ReleephAuthorFieldSpecification' => 'ReleephFieldSpecification',
     'ReleephBranch' =>
@@ -5502,10 +5502,10 @@
     'ReleephSummaryFieldSpecification' => 'ReleephFieldSpecification',
     'ReleephUserView' => 'AphrontView',
     'ShellLogView' => 'AphrontView',
-    'SleepBuildStepImplementation' => 'BuildStepImplementation',
+    'SleepBuildStepImplementation' => 'HarbormasterBuildStepImplementation',
     'SlowvoteEmbedView' => 'AphrontView',
     'SlowvoteRemarkupRule' => 'PhabricatorRemarkupRuleObject',
-    'UploadArtifactBuildStepImplementation' => 'BuildStepImplementation',
-    'WaitForPreviousBuildStepImplementation' => 'BuildStepImplementation',
+    'UploadArtifactBuildStepImplementation' => 'HarbormasterBuildStepImplementation',
+    'WaitForPreviousBuildStepImplementation' => 'HarbormasterBuildStepImplementation',
   ),
 ));
diff --git a/src/applications/harbormaster/controller/HarbormasterPlanViewController.php b/src/applications/harbormaster/controller/HarbormasterPlanViewController.php
--- a/src/applications/harbormaster/controller/HarbormasterPlanViewController.php
+++ b/src/applications/harbormaster/controller/HarbormasterPlanViewController.php
@@ -164,10 +164,11 @@
 
       $has_conflicts = false;
       if ($inputs || $outputs) {
-        $available_artifacts = BuildStepImplementation::loadAvailableArtifacts(
-          $plan,
-          $step,
-          null);
+        $available_artifacts =
+          HarbormasterBuildStepImplementation::loadAvailableArtifacts(
+            $plan,
+            $step,
+            null);
 
         list($inputs_ui, $has_conflicts) = $this->buildArtifactList(
             $inputs,
diff --git a/src/applications/harbormaster/controller/HarbormasterStepAddController.php b/src/applications/harbormaster/controller/HarbormasterStepAddController.php
--- a/src/applications/harbormaster/controller/HarbormasterStepAddController.php
+++ b/src/applications/harbormaster/controller/HarbormasterStepAddController.php
@@ -26,7 +26,8 @@
       throw new Exception("Build plan not found!");
     }
 
-    $implementations = BuildStepImplementation::getImplementations();
+    $implementations =
+      HarbormasterBuildStepImplementation::getImplementations();
 
     $cancel_uri = $this->getApplicationURI('plan/'.$plan->getID().'/');
 
diff --git a/src/applications/harbormaster/step/CommandBuildStepImplementation.php b/src/applications/harbormaster/step/CommandBuildStepImplementation.php
--- a/src/applications/harbormaster/step/CommandBuildStepImplementation.php
+++ b/src/applications/harbormaster/step/CommandBuildStepImplementation.php
@@ -1,7 +1,7 @@
 <?php
 
 final class CommandBuildStepImplementation
-  extends BuildStepImplementation {
+  extends HarbormasterBuildStepImplementation {
 
   public function getName() {
     return pht('Run Command');
diff --git a/src/applications/harbormaster/step/BuildStepImplementation.php b/src/applications/harbormaster/step/HarbormasterBuildStepImplementation.php
rename from src/applications/harbormaster/step/BuildStepImplementation.php
rename to src/applications/harbormaster/step/HarbormasterBuildStepImplementation.php
--- a/src/applications/harbormaster/step/BuildStepImplementation.php
+++ b/src/applications/harbormaster/step/HarbormasterBuildStepImplementation.php
@@ -1,10 +1,10 @@
 <?php
 
-abstract class BuildStepImplementation {
+abstract class HarbormasterBuildStepImplementation {
 
   public static function getImplementations() {
     $symbols = id(new PhutilSymbolLoader())
-      ->setAncestorClass('BuildStepImplementation')
+      ->setAncestorClass('HarbormasterBuildStepImplementation')
       ->setConcreteOnly(true)
       ->selectAndLoadSymbols();
     return ipull($symbols, 'name');
diff --git a/src/applications/harbormaster/step/HarbormasterHTTPRequestBuildStepImplementation.php b/src/applications/harbormaster/step/HarbormasterHTTPRequestBuildStepImplementation.php
--- a/src/applications/harbormaster/step/HarbormasterHTTPRequestBuildStepImplementation.php
+++ b/src/applications/harbormaster/step/HarbormasterHTTPRequestBuildStepImplementation.php
@@ -1,7 +1,7 @@
 <?php
 
 final class HarbormasterHTTPRequestBuildStepImplementation
-  extends BuildStepImplementation {
+  extends HarbormasterBuildStepImplementation {
 
   public function getName() {
     return pht('Make HTTP Request');
diff --git a/src/applications/harbormaster/step/HarbormasterThrowExceptionBuildStep.php b/src/applications/harbormaster/step/HarbormasterThrowExceptionBuildStep.php
--- a/src/applications/harbormaster/step/HarbormasterThrowExceptionBuildStep.php
+++ b/src/applications/harbormaster/step/HarbormasterThrowExceptionBuildStep.php
@@ -1,7 +1,7 @@
 <?php
 
 final class HarbormasterThrowExceptionBuildStep
-  extends BuildStepImplementation {
+  extends HarbormasterBuildStepImplementation {
 
   public function getName() {
     return pht('Throw Exception');
diff --git a/src/applications/harbormaster/step/LeaseHostBuildStepImplementation.php b/src/applications/harbormaster/step/LeaseHostBuildStepImplementation.php
--- a/src/applications/harbormaster/step/LeaseHostBuildStepImplementation.php
+++ b/src/applications/harbormaster/step/LeaseHostBuildStepImplementation.php
@@ -1,7 +1,7 @@
 <?php
 
 final class LeaseHostBuildStepImplementation
-  extends BuildStepImplementation {
+  extends HarbormasterBuildStepImplementation {
 
   public function getName() {
     return pht('Lease Host');
diff --git a/src/applications/harbormaster/step/PublishFragmentBuildStepImplementation.php b/src/applications/harbormaster/step/PublishFragmentBuildStepImplementation.php
--- a/src/applications/harbormaster/step/PublishFragmentBuildStepImplementation.php
+++ b/src/applications/harbormaster/step/PublishFragmentBuildStepImplementation.php
@@ -1,7 +1,7 @@
 <?php
 
 final class PublishFragmentBuildStepImplementation
-  extends BuildStepImplementation {
+  extends HarbormasterBuildStepImplementation {
 
   public function getName() {
     return pht('Publish Fragment');
diff --git a/src/applications/harbormaster/step/SleepBuildStepImplementation.php b/src/applications/harbormaster/step/SleepBuildStepImplementation.php
--- a/src/applications/harbormaster/step/SleepBuildStepImplementation.php
+++ b/src/applications/harbormaster/step/SleepBuildStepImplementation.php
@@ -1,6 +1,7 @@
 <?php
 
-final class SleepBuildStepImplementation extends BuildStepImplementation {
+final class SleepBuildStepImplementation
+  extends HarbormasterBuildStepImplementation {
 
   public function getName() {
     return pht('Sleep');
diff --git a/src/applications/harbormaster/step/UploadArtifactBuildStepImplementation.php b/src/applications/harbormaster/step/UploadArtifactBuildStepImplementation.php
--- a/src/applications/harbormaster/step/UploadArtifactBuildStepImplementation.php
+++ b/src/applications/harbormaster/step/UploadArtifactBuildStepImplementation.php
@@ -1,7 +1,7 @@
 <?php
 
 final class UploadArtifactBuildStepImplementation
-  extends BuildStepImplementation {
+  extends HarbormasterBuildStepImplementation {
 
   public function getName() {
     return pht('Upload Artifact');
diff --git a/src/applications/harbormaster/step/WaitForPreviousBuildStepImplementation.php b/src/applications/harbormaster/step/WaitForPreviousBuildStepImplementation.php
--- a/src/applications/harbormaster/step/WaitForPreviousBuildStepImplementation.php
+++ b/src/applications/harbormaster/step/WaitForPreviousBuildStepImplementation.php
@@ -1,7 +1,7 @@
 <?php
 
 final class WaitForPreviousBuildStepImplementation
-  extends BuildStepImplementation {
+  extends HarbormasterBuildStepImplementation {
 
   public function getName() {
     return pht('Wait for Previous Commits to Build');
diff --git a/src/applications/harbormaster/storage/build/HarbormasterBuildTarget.php b/src/applications/harbormaster/storage/build/HarbormasterBuildTarget.php
--- a/src/applications/harbormaster/storage/build/HarbormasterBuildTarget.php
+++ b/src/applications/harbormaster/storage/build/HarbormasterBuildTarget.php
@@ -88,7 +88,8 @@
 
     static $implementations = null;
     if ($implementations === null) {
-      $implementations = BuildStepImplementation::getImplementations();
+      $implementations =
+        HarbormasterBuildStepImplementation::getImplementations();
     }
 
     $class = $this->className;
diff --git a/src/applications/harbormaster/storage/configuration/HarbormasterBuildStep.php b/src/applications/harbormaster/storage/configuration/HarbormasterBuildStep.php
--- a/src/applications/harbormaster/storage/configuration/HarbormasterBuildStep.php
+++ b/src/applications/harbormaster/storage/configuration/HarbormasterBuildStep.php
@@ -52,7 +52,8 @@
 
     static $implementations = null;
     if ($implementations === null) {
-      $implementations = BuildStepImplementation::getImplementations();
+      $implementations =
+        HarbormasterBuildStepImplementation::getImplementations();
     }
 
     $class = $this->className;