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
@@ -1388,6 +1388,8 @@
     'HarbormasterBuildArtifactQuery' => 'applications/harbormaster/query/HarbormasterBuildArtifactQuery.php',
     'HarbormasterBuildAutoplan' => 'applications/harbormaster/autoplan/HarbormasterBuildAutoplan.php',
     'HarbormasterBuildDependencyDatasource' => 'applications/harbormaster/typeahead/HarbormasterBuildDependencyDatasource.php',
+    'HarbormasterBuildEditAPIMethod' => 'applications/harbormaster/conduit/HarbormasterBuildEditAPIMethod.php',
+    'HarbormasterBuildEditEngine' => 'applications/harbormaster/editor/HarbormasterBuildEditEngine.php',
     'HarbormasterBuildEngine' => 'applications/harbormaster/engine/HarbormasterBuildEngine.php',
     'HarbormasterBuildFailureException' => 'applications/harbormaster/exception/HarbormasterBuildFailureException.php',
     'HarbormasterBuildGraph' => 'applications/harbormaster/engine/HarbormasterBuildGraph.php',
@@ -1472,6 +1474,8 @@
     'HarbormasterBuildable' => 'applications/harbormaster/storage/HarbormasterBuildable.php',
     'HarbormasterBuildableActionController' => 'applications/harbormaster/controller/HarbormasterBuildableActionController.php',
     'HarbormasterBuildableAdapterInterface' => 'applications/harbormaster/herald/HarbormasterBuildableAdapterInterface.php',
+    'HarbormasterBuildableEditAPIMethod' => 'applications/harbormaster/conduit/HarbormasterBuildableEditAPIMethod.php',
+    'HarbormasterBuildableEditEngine' => 'applications/harbormaster/editor/HarbormasterBuildableEditEngine.php',
     'HarbormasterBuildableEngine' => 'applications/harbormaster/engine/HarbormasterBuildableEngine.php',
     'HarbormasterBuildableInterface' => 'applications/harbormaster/interface/HarbormasterBuildableInterface.php',
     'HarbormasterBuildableListController' => 'applications/harbormaster/controller/HarbormasterBuildableListController.php',
@@ -7605,6 +7609,8 @@
     'HarbormasterBuildArtifactQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
     'HarbormasterBuildAutoplan' => 'Phobject',
     'HarbormasterBuildDependencyDatasource' => 'PhabricatorTypeaheadDatasource',
+    'HarbormasterBuildEditAPIMethod' => 'PhabricatorEditEngineAPIMethod',
+    'HarbormasterBuildEditEngine' => 'PhabricatorEditEngine',
     'HarbormasterBuildEngine' => 'Phobject',
     'HarbormasterBuildFailureException' => 'Exception',
     'HarbormasterBuildGraph' => 'AbstractDirectedGraph',
@@ -7730,6 +7736,8 @@
       'PhabricatorDestructibleInterface',
     ),
     'HarbormasterBuildableActionController' => 'HarbormasterController',
+    'HarbormasterBuildableEditAPIMethod' => 'PhabricatorEditEngineAPIMethod',
+    'HarbormasterBuildableEditEngine' => 'PhabricatorEditEngine',
     'HarbormasterBuildableEngine' => 'Phobject',
     'HarbormasterBuildableListController' => 'HarbormasterController',
     'HarbormasterBuildableMessageTransaction' => 'HarbormasterBuildableTransactionType',
diff --git a/src/applications/harbormaster/conduit/HarbormasterBuildEditAPIMethod.php b/src/applications/harbormaster/conduit/HarbormasterBuildEditAPIMethod.php
new file mode 100644
--- /dev/null
+++ b/src/applications/harbormaster/conduit/HarbormasterBuildEditAPIMethod.php
@@ -0,0 +1,20 @@
+<?php
+
+final class HarbormasterBuildEditAPIMethod
+  extends PhabricatorEditEngineAPIMethod {
+
+  public function getAPIMethodName() {
+    return 'harbormaster.build.edit';
+  }
+
+  public function newEditEngine() {
+    return new HarbormasterBuildEditEngine();
+  }
+
+  public function getMethodSummary() {
+    return pht(
+      'Apply transactions to create a new build or edit an existing '.
+      'one.');
+  }
+
+}
diff --git a/src/applications/harbormaster/conduit/HarbormasterBuildableEditAPIMethod.php b/src/applications/harbormaster/conduit/HarbormasterBuildableEditAPIMethod.php
new file mode 100644
--- /dev/null
+++ b/src/applications/harbormaster/conduit/HarbormasterBuildableEditAPIMethod.php
@@ -0,0 +1,20 @@
+<?php
+
+final class HarbormasterBuildableEditAPIMethod
+  extends PhabricatorEditEngineAPIMethod {
+
+  public function getAPIMethodName() {
+    return 'harbormaster.buildable.edit';
+  }
+
+  public function newEditEngine() {
+    return new HarbormasterBuildableEditEngine();
+  }
+
+  public function getMethodSummary() {
+    return pht(
+      'Apply transactions to create a new buildable or edit an existing '.
+      'one.');
+  }
+
+}
diff --git a/src/applications/harbormaster/editor/HarbormasterBuildEditEngine.php b/src/applications/harbormaster/editor/HarbormasterBuildEditEngine.php
new file mode 100644
--- /dev/null
+++ b/src/applications/harbormaster/editor/HarbormasterBuildEditEngine.php
@@ -0,0 +1,87 @@
+<?php
+
+final class HarbormasterBuildEditEngine
+  extends PhabricatorEditEngine {
+
+  const ENGINECONST = 'harbormaster.build';
+
+  public function isEngineConfigurable() {
+    return false;
+  }
+
+  public function getEngineName() {
+    return pht('Harbormaster Builds');
+  }
+
+  public function getSummaryHeader() {
+    return pht('Edit Harbormaster Build Configurations');
+  }
+
+  public function getSummaryText() {
+    return pht('This engine is used to edit Harbormaster builds.');
+  }
+
+  public function getEngineApplicationClass() {
+    return 'PhabricatorHarbormasterApplication';
+  }
+
+  protected function newEditableObject() {
+    $viewer = $this->getViewer();
+    return HarbormasterBuild::initializeNewBuild($viewer);
+  }
+
+  protected function newObjectQuery() {
+    return new HarbormasterBuildQuery();
+  }
+
+  protected function newEditableObjectForDocumentation() {
+    $object = new DifferentialRevision();
+
+    $buildable = id(new HarbormasterBuildable())
+      ->attachBuildableObject($object);
+
+    return $this->newEditableObject()
+      ->attachBuildable($buildable);
+  }
+
+  protected function getObjectCreateTitleText($object) {
+    return pht('Create Build');
+  }
+
+  protected function getObjectCreateButtonText($object) {
+    return pht('Create Build');
+  }
+
+  protected function getObjectEditTitleText($object) {
+    return pht('Edit Build: %s', $object->getName());
+  }
+
+  protected function getObjectEditShortText($object) {
+    return pht('Edit Build');
+  }
+
+  protected function getObjectCreateShortText() {
+    return pht('Create Build');
+  }
+
+  protected function getObjectName() {
+    return pht('Build');
+  }
+
+  protected function getEditorURI() {
+    return '/harbormaster/build/edit/';
+  }
+
+  protected function getObjectCreateCancelURI($object) {
+    return '/harbormaster/';
+  }
+
+  protected function getObjectViewURI($object) {
+    return $object->getURI();
+  }
+
+  protected function buildCustomEditFields($object) {
+    return array();
+  }
+
+}
diff --git a/src/applications/harbormaster/editor/HarbormasterBuildableEditEngine.php b/src/applications/harbormaster/editor/HarbormasterBuildableEditEngine.php
new file mode 100644
--- /dev/null
+++ b/src/applications/harbormaster/editor/HarbormasterBuildableEditEngine.php
@@ -0,0 +1,84 @@
+<?php
+
+final class HarbormasterBuildableEditEngine
+  extends PhabricatorEditEngine {
+
+  const ENGINECONST = 'harbormaster.buildable';
+
+  public function isEngineConfigurable() {
+    return false;
+  }
+
+  public function getEngineName() {
+    return pht('Harbormaster Buildables');
+  }
+
+  public function getSummaryHeader() {
+    return pht('Edit Harbormaster Buildable Configurations');
+  }
+
+  public function getSummaryText() {
+    return pht('This engine is used to edit Harbormaster buildables.');
+  }
+
+  public function getEngineApplicationClass() {
+    return 'PhabricatorHarbormasterApplication';
+  }
+
+  protected function newEditableObject() {
+    $viewer = $this->getViewer();
+    return HarbormasterBuildable::initializeNewBuildable($viewer);
+  }
+
+  protected function newObjectQuery() {
+    return new HarbormasterBuildableQuery();
+  }
+
+  protected function newEditableObjectForDocumentation() {
+    $object = new DifferentialRevision();
+
+    return $this->newEditableObject()
+      ->attachBuildableObject($object);
+  }
+
+  protected function getObjectCreateTitleText($object) {
+    return pht('Create Buildable');
+  }
+
+  protected function getObjectCreateButtonText($object) {
+    return pht('Create Buildable');
+  }
+
+  protected function getObjectEditTitleText($object) {
+    return pht('Edit Buildable: %s', $object->getName());
+  }
+
+  protected function getObjectEditShortText($object) {
+    return pht('Edit Buildable');
+  }
+
+  protected function getObjectCreateShortText() {
+    return pht('Create Buildable');
+  }
+
+  protected function getObjectName() {
+    return pht('Buildable');
+  }
+
+  protected function getEditorURI() {
+    return '/harbormaster/buildable/edit/';
+  }
+
+  protected function getObjectCreateCancelURI($object) {
+    return '/harbormaster/';
+  }
+
+  protected function getObjectViewURI($object) {
+    return $object->getURI();
+  }
+
+  protected function buildCustomEditFields($object) {
+    return array();
+  }
+
+}