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
@@ -238,6 +238,7 @@
     'ConduitMethodDoesNotExistException' => 'applications/conduit/protocol/exception/ConduitMethodDoesNotExistException.php',
     'ConduitMethodNotFoundException' => 'applications/conduit/protocol/exception/ConduitMethodNotFoundException.php',
     'ConduitPHIDListParameterType' => 'applications/conduit/parametertype/ConduitPHIDListParameterType.php',
+    'ConduitPHIDParameterType' => 'applications/conduit/parametertype/ConduitPHIDParameterType.php',
     'ConduitParameterType' => 'applications/conduit/parametertype/ConduitParameterType.php',
     'ConduitPingConduitAPIMethod' => 'applications/conduit/method/ConduitPingConduitAPIMethod.php',
     'ConduitProjectListParameterType' => 'applications/conduit/parametertype/ConduitProjectListParameterType.php',
@@ -248,6 +249,7 @@
     'ConduitStringParameterType' => 'applications/conduit/parametertype/ConduitStringParameterType.php',
     'ConduitTokenGarbageCollector' => 'applications/conduit/garbagecollector/ConduitTokenGarbageCollector.php',
     'ConduitUserListParameterType' => 'applications/conduit/parametertype/ConduitUserListParameterType.php',
+    'ConduitWildParameterType' => 'applications/conduit/parametertype/ConduitWildParameterType.php',
     'ConpherenceColumnViewController' => 'applications/conpherence/controller/ConpherenceColumnViewController.php',
     'ConpherenceConduitAPIMethod' => 'applications/conpherence/conduit/ConpherenceConduitAPIMethod.php',
     'ConpherenceConfigOptions' => 'applications/conpherence/config/ConpherenceConfigOptions.php',
@@ -4103,6 +4105,7 @@
     'ConduitMethodDoesNotExistException' => 'ConduitMethodNotFoundException',
     'ConduitMethodNotFoundException' => 'ConduitException',
     'ConduitPHIDListParameterType' => 'ConduitListParameterType',
+    'ConduitPHIDParameterType' => 'ConduitListParameterType',
     'ConduitParameterType' => 'Phobject',
     'ConduitPingConduitAPIMethod' => 'ConduitAPIMethod',
     'ConduitProjectListParameterType' => 'ConduitListParameterType',
@@ -4113,6 +4116,7 @@
     'ConduitStringParameterType' => 'ConduitListParameterType',
     'ConduitTokenGarbageCollector' => 'PhabricatorGarbageCollector',
     'ConduitUserListParameterType' => 'ConduitListParameterType',
+    'ConduitWildParameterType' => 'ConduitListParameterType',
     'ConpherenceColumnViewController' => 'ConpherenceController',
     'ConpherenceConduitAPIMethod' => 'ConduitAPIMethod',
     'ConpherenceConfigOptions' => 'PhabricatorApplicationConfigOptions',
diff --git a/src/applications/conduit/parametertype/ConduitPHIDParameterType.php b/src/applications/conduit/parametertype/ConduitPHIDParameterType.php
new file mode 100644
--- /dev/null
+++ b/src/applications/conduit/parametertype/ConduitPHIDParameterType.php
@@ -0,0 +1,35 @@
+<?php
+
+final class ConduitPHIDParameterType
+  extends ConduitListParameterType {
+
+  protected function getParameterValue(array $request, $key) {
+    $value = parent::getParameterValue($request, $key);
+
+    if (!is_string($value)) {
+      $this->raiseValidationException(
+        $request,
+        $key,
+        pht('Expected PHID, got something else.'));
+    }
+
+    return $value;
+  }
+
+  protected function getParameterTypeName() {
+    return 'phid';
+  }
+
+  protected function getParameterFormatDescriptions() {
+    return array(
+      pht('A PHID.'),
+    );
+  }
+
+  protected function getParameterExamples() {
+    return array(
+      '"PHID-WXYZ-1111222233334444"',
+    );
+  }
+
+}
diff --git a/src/applications/conduit/parametertype/ConduitWildParameterType.php b/src/applications/conduit/parametertype/ConduitWildParameterType.php
new file mode 100644
--- /dev/null
+++ b/src/applications/conduit/parametertype/ConduitWildParameterType.php
@@ -0,0 +1,22 @@
+<?php
+
+final class ConduitWildParameterType
+  extends ConduitListParameterType {
+
+  protected function getParameterTypeName() {
+    return 'wild';
+  }
+
+  protected function getParameterFormatDescriptions() {
+    return array(
+      pht('Any mixed or complex value. Check the documentation for details.'),
+    );
+  }
+
+  protected function getParameterExamples() {
+    return array(
+      pht('(Wildcard)'),
+    );
+  }
+
+}
diff --git a/src/applications/maniphest/editor/ManiphestEditEngine.php b/src/applications/maniphest/editor/ManiphestEditEngine.php
--- a/src/applications/maniphest/editor/ManiphestEditEngine.php
+++ b/src/applications/maniphest/editor/ManiphestEditEngine.php
@@ -76,6 +76,8 @@
         ->setKey('parent')
         ->setLabel(pht('Parent Task'))
         ->setDescription(pht('Task to make this a subtask of.'))
+        ->setConduitDescription(pht('Create as a subtask of another task.'))
+        ->setConduitTypeDescription(pht('PHID of the parent task.'))
         ->setAliases(array('parentPHID'))
         ->setTransactionType(ManiphestTransaction::TYPE_PARENT)
         ->setHandleParameterType(new ManiphestTaskListHTTPParameterType())
@@ -87,6 +89,8 @@
         ->setKey('column')
         ->setLabel(pht('Column'))
         ->setDescription(pht('Workboard column to create this task into.'))
+        ->setConduitDescription(pht('Create into a workboard column.'))
+        ->setConduitTypeDescription(pht('PHID of workboard column.'))
         ->setAliases(array('columnPHID'))
         ->setTransactionType(ManiphestTransaction::TYPE_COLUMN)
         ->setSingleValue(null)
@@ -98,6 +102,8 @@
         ->setKey('title')
         ->setLabel(pht('Title'))
         ->setDescription(pht('Name of the task.'))
+        ->setConduitDescription(pht('Rename the task.'))
+        ->setConduitTypeDescription(pht('New task name.'))
         ->setTransactionType(ManiphestTransaction::TYPE_TITLE)
         ->setIsRequired(true)
         ->setValue($object->getTitle()),
@@ -106,6 +112,9 @@
         ->setAliases(array('ownerPHID', 'assign', 'assigned'))
         ->setLabel(pht('Assigned To'))
         ->setDescription(pht('User who is responsible for the task.'))
+        ->setConduitDescription(pht('Reassign the task.'))
+        ->setConduitTypeDescription(
+          pht('New task owner, or `null` to unassign.'))
         ->setTransactionType(ManiphestTransaction::TYPE_OWNER)
         ->setIsCopyable(true)
         ->setSingleValue($object->getOwnerPHID())
@@ -115,6 +124,8 @@
         ->setKey('status')
         ->setLabel(pht('Status'))
         ->setDescription(pht('Status of the task.'))
+        ->setConduitDescription(pht('Change the task status.'))
+        ->setConduitTypeDescription(pht('New task status constant.'))
         ->setTransactionType(ManiphestTransaction::TYPE_STATUS)
         ->setIsCopyable(true)
         ->setValue($object->getStatus())
@@ -125,6 +136,8 @@
         ->setKey('priority')
         ->setLabel(pht('Priority'))
         ->setDescription(pht('Priority of the task.'))
+        ->setConduitDescription(pht('Change the priority of the task.'))
+        ->setConduitTypeDescription(pht('New task priority constant.'))
         ->setTransactionType(ManiphestTransaction::TYPE_PRIORITY)
         ->setIsCopyable(true)
         ->setValue($object->getPriority())
@@ -134,6 +147,8 @@
         ->setKey('description')
         ->setLabel(pht('Description'))
         ->setDescription(pht('Task description.'))
+        ->setConduitDescription(pht('Update the task description.'))
+        ->setConduitTypeDescription(pht('New task description.'))
         ->setTransactionType(ManiphestTransaction::TYPE_DESCRIPTION)
         ->setValue($object->getDescription()),
     );
diff --git a/src/applications/owners/editor/PhabricatorOwnersPackageEditEngine.php b/src/applications/owners/editor/PhabricatorOwnersPackageEditEngine.php
--- a/src/applications/owners/editor/PhabricatorOwnersPackageEditEngine.php
+++ b/src/applications/owners/editor/PhabricatorOwnersPackageEditEngine.php
@@ -122,9 +122,12 @@
       id(new PhabricatorConduitEditField())
         ->setKey('paths.set')
         ->setLabel(pht('Paths'))
-        ->setDescription(pht('Set paths for this package.'))
         ->setIsConduitOnly(true)
         ->setTransactionType(PhabricatorOwnersPackageTransaction::TYPE_PATHS)
+        ->setConduitDescription(
+          pht('Overwrite existing package paths with new paths.'))
+        ->setConduitTypeDescription(
+          pht('List of dictionaries, each describing a path.'))
         ->setConduitDocumentation($paths_help),
     );
   }
diff --git a/src/applications/paste/editor/PhabricatorPasteEditEngine.php b/src/applications/paste/editor/PhabricatorPasteEditEngine.php
--- a/src/applications/paste/editor/PhabricatorPasteEditEngine.php
+++ b/src/applications/paste/editor/PhabricatorPasteEditEngine.php
@@ -59,38 +59,46 @@
       id(new PhabricatorTextEditField())
         ->setKey('title')
         ->setLabel(pht('Title'))
-        ->setDescription(pht('Name of the paste.'))
         ->setTransactionType(PhabricatorPasteTransaction::TYPE_TITLE)
+        ->setDescription(pht('The title of the paste.'))
+        ->setConduitDescription(pht('Retitle the paste.'))
+        ->setConduitTypeDescription(pht('New paste title.'))
         ->setValue($object->getTitle()),
       id(new PhabricatorSelectEditField())
         ->setKey('language')
         ->setLabel(pht('Language'))
-        ->setDescription(
-          pht(
-            'Programming language to interpret the paste as for syntax '.
-            'highlighting. By default, the language is inferred from the '.
-            'title.'))
-        ->setAliases(array('lang'))
         ->setTransactionType(PhabricatorPasteTransaction::TYPE_LANGUAGE)
+        ->setAliases(array('lang'))
         ->setIsCopyable(true)
-        ->setValue($object->getLanguage())
-        ->setOptions($langs),
+        ->setOptions($langs)
+        ->setDescription(
+          pht(
+            'Language used for syntax highlighting. By default, inferred '.
+            'from the title.'))
+        ->setConduitDescription(
+          pht('Change language used for syntax highlighting.'))
+        ->setConduitTypeDescription(pht('New highlighting language.'))
+        ->setValue($object->getLanguage()),
       id(new PhabricatorTextAreaEditField())
         ->setKey('text')
         ->setLabel(pht('Text'))
-        ->setDescription(pht('The main body text of the paste.'))
         ->setTransactionType(PhabricatorPasteTransaction::TYPE_CONTENT)
         ->setMonospaced(true)
         ->setHeight(AphrontFormTextAreaControl::HEIGHT_VERY_TALL)
+        ->setDescription(pht('The main body text of the paste.'))
+        ->setConduitDescription(pht('Change the paste content.'))
+        ->setConduitTypeDescription(pht('New body content.'))
         ->setValue($object->getRawContent()),
       id(new PhabricatorSelectEditField())
         ->setKey('status')
         ->setLabel(pht('Status'))
-        ->setDescription(pht('Active or archive the paste.'))
         ->setTransactionType(PhabricatorPasteTransaction::TYPE_STATUS)
         ->setIsConduitOnly(true)
-        ->setValue($object->getStatus())
-        ->setOptions(PhabricatorPaste::getStatusNameMap()),
+        ->setOptions(PhabricatorPaste::getStatusNameMap())
+        ->setDescription(pht('Active or archived status.'))
+        ->setConduitDescription(pht('Active or archive the paste.'))
+        ->setConduitTypeDescription(pht('New paste status constant.'))
+        ->setValue($object->getStatus()),
     );
   }
 
diff --git a/src/applications/policy/editor/PhabricatorPolicyEditEngineExtension.php b/src/applications/policy/editor/PhabricatorPolicyEditEngineExtension.php
--- a/src/applications/policy/editor/PhabricatorPolicyEditEngineExtension.php
+++ b/src/applications/policy/editor/PhabricatorPolicyEditEngineExtension.php
@@ -81,13 +81,14 @@
       $policy_field = id(new PhabricatorPolicyEditField())
         ->setKey($key)
         ->setLabel($label)
-        ->setDescription($description)
         ->setAliases($aliases)
         ->setIsCopyable(true)
         ->setCapability($capability)
         ->setPolicies($policies)
         ->setTransactionType($type)
         ->setEditTypeKey($edit)
+        ->setConduitDescription($description)
+        ->setConduitTypeDescription(pht('New policy PHID or constant.'))
         ->setValue($object->getPolicy($capability));
       $fields[] = $policy_field;
 
@@ -99,12 +100,14 @@
               ->setKey('spacePHID')
               ->setLabel(pht('Space'))
               ->setEditTypeKey('space')
-              ->setDescription(
-                pht('Shifts the object in the Spaces application.'))
               ->setIsCopyable(true)
               ->setIsReorderable(false)
               ->setAliases(array('space', 'policy.space'))
               ->setTransactionType($type_space)
+              ->setDescription(pht('Select a space for the object.'))
+              ->setConduitDescription(
+                pht('Shift the object between spaces.'))
+              ->setConduitTypeDescription(pht('New space PHID.'))
               ->setValue($object->getSpacePHID());
             $fields[] = $space_field;
 
diff --git a/src/applications/project/engineextension/PhabricatorProjectsEditEngineExtension.php b/src/applications/project/engineextension/PhabricatorProjectsEditEngineExtension.php
--- a/src/applications/project/engineextension/PhabricatorProjectsEditEngineExtension.php
+++ b/src/applications/project/engineextension/PhabricatorProjectsEditEngineExtension.php
@@ -46,19 +46,27 @@
       ->setKey('projectPHIDs')
       ->setLabel(pht('Projects'))
       ->setEditTypeKey('projects')
-      ->setDescription(pht('Add or remove associated projects.'))
       ->setAliases(array('project', 'projects'))
       ->setIsCopyable(true)
       ->setUseEdgeTransactions(true)
-      ->setEdgeTransactionDescriptions(
-        pht('Add projects.'),
-        pht('Remove projects.'),
-        pht('Set associated projects, overwriting current value.'))
       ->setCommentActionLabel(pht('Change Projects'))
+      ->setDescription(pht('Select projects for the object.'))
       ->setTransactionType($edge_type)
       ->setMetadataValue('edge:type', $project_edge_type)
       ->setValue($project_phids);
 
+    $projects_field->setViewer($engine->getViewer());
+
+    $edit_add = $projects_field->getConduitEditType('projects.add')
+      ->setConduitDescription(pht('Add projects.'));
+
+    $edit_set = $projects_field->getConduitEditType('projects.set')
+      ->setConduitDescription(
+        pht('Set projects, overwriting current value.'));
+
+    $edit_rem = $projects_field->getConduitEditType('projects.remove')
+      ->setConduitDescription(pht('Remove projects.'));
+
     return array(
       $projects_field,
     );
diff --git a/src/applications/subscriptions/engineextension/PhabricatorSubscriptionsEditEngineExtension.php b/src/applications/subscriptions/engineextension/PhabricatorSubscriptionsEditEngineExtension.php
--- a/src/applications/subscriptions/engineextension/PhabricatorSubscriptionsEditEngineExtension.php
+++ b/src/applications/subscriptions/engineextension/PhabricatorSubscriptionsEditEngineExtension.php
@@ -41,18 +41,25 @@
       ->setKey('subscriberPHIDs')
       ->setLabel(pht('Subscribers'))
       ->setEditTypeKey('subscribers')
-      ->setDescription(pht('Manage subscribers.'))
       ->setAliases(array('subscriber', 'subscribers'))
       ->setIsCopyable(true)
       ->setUseEdgeTransactions(true)
-      ->setEdgeTransactionDescriptions(
-        pht('Add subscribers.'),
-        pht('Remove subscribers.'),
-        pht('Set subscribers, overwriting current value.'))
       ->setCommentActionLabel(pht('Change Subscribers'))
       ->setTransactionType($subscribers_type)
       ->setValue($sub_phids);
 
+    $subscribers_field->setViewer($engine->getViewer());
+
+    $edit_add = $subscribers_field->getConduitEditType('subscribers.add')
+      ->setConduitDescription(pht('Add subscribers.'));
+
+    $edit_set = $subscribers_field->getConduitEditType('subscribers.set')
+      ->setConduitDescription(
+        pht('Set subscribers, overwriting current value.'));
+
+    $edit_rem = $subscribers_field->getConduitEditType('subscribers.remove')
+      ->setConduitDescription(pht('Remove subscribers.'));
+
     return array(
       $subscribers_field,
     );
diff --git a/src/applications/transactions/editengine/PhabricatorEditEngine.php b/src/applications/transactions/editengine/PhabricatorEditEngine.php
--- a/src/applications/transactions/editengine/PhabricatorEditEngine.php
+++ b/src/applications/transactions/editengine/PhabricatorEditEngine.php
@@ -64,6 +64,10 @@
   abstract public function getEngineApplicationClass();
   abstract protected function buildCustomEditFields($object);
 
+  protected function didBuildCustomEditFields($object, array $fields) {
+    return;
+  }
+
   public function getFieldsForConfig(
     PhabricatorEditEngineConfiguration $config) {
 
@@ -82,6 +86,15 @@
 
     $fields = $this->buildCustomEditFields($object);
 
+    foreach ($fields as $field) {
+      $field
+        ->setViewer($viewer)
+        ->setObject($object);
+    }
+
+    $fields = mpull($fields, null, 'getKey');
+    $this->didBuildCustomEditFields($object, $fields);
+
     $extensions = PhabricatorEditEngineExtension::getAllEnabledExtensions();
     foreach ($extensions as $extension) {
       $extension->setViewer($viewer);
@@ -96,19 +109,22 @@
       assert_instances_of($extension_fields, 'PhabricatorEditField');
 
       foreach ($extension_fields as $field) {
-        $fields[] = $field;
+        $field
+          ->setViewer($viewer)
+          ->setObject($object);
+      }
+
+      $extension_fields = mpull($extension_fields, null, 'getKey');
+      $extension->didBuildCustomEditFields($this, $object, $extension_fields);
+
+      foreach ($extension_fields as $key => $field) {
+        $fields[$key] = $field;
       }
     }
 
     $config = $this->getEditEngineConfiguration();
     $fields = $config->applyConfigurationToFields($this, $object, $fields);
 
-    foreach ($fields as $field) {
-      $field
-        ->setViewer($viewer)
-        ->setObject($object);
-    }
-
     return $fields;
   }
 
@@ -1595,6 +1611,11 @@
     foreach ($xactions as $xaction) {
       $type = $types[$xaction['type']];
 
+      // Let the parameter type interpret the value. This allows you to
+      // use usernames in list<user> fields, for example.
+      $parameter_type = $type->getConduitParameterType();
+      $xaction['value'] = $parameter_type->getValue($xaction, 'value');
+
       $type_xactions = $type->generateTransactions(
         clone $template,
         $xaction);
diff --git a/src/applications/transactions/editengine/PhabricatorEditEngineAPIMethod.php b/src/applications/transactions/editengine/PhabricatorEditEngineAPIMethod.php
--- a/src/applications/transactions/editengine/PhabricatorEditEngineAPIMethod.php
+++ b/src/applications/transactions/editengine/PhabricatorEditEngineAPIMethod.php
@@ -146,17 +146,16 @@
       );
 
     $key = pht('Key');
-    $summary = pht('Summary');
     $description = pht('Description');
     $head_type = pht('Type');
 
     $table = array();
-    $table[] = "| {$key} | {$summary} |";
+    $table[] = "| {$key} | {$description} |";
     $table[] = '|--------|----------------|';
     foreach ($types as $type) {
       $edit_type = $type->getEditType();
-      $edit_summary = $type->getSummary();
-      $table[] = "| `{$edit_type}` | {$edit_summary} |";
+      $edit_description = $type->getConduitDescription();
+      $table[] = "| `{$edit_type}` | {$edit_description} |";
     }
 
     $out[] = implode("\n", $table);
@@ -166,7 +165,7 @@
       $section[] = pht('Edit Type: %s', $type->getEditType());
       $section[] = '---------';
       $section[] = null;
-      $section[] = $type->getDescription();
+      $section[] = $type->getConduitDescription();
       $section[] = null;
       $section[] = pht(
         'This edit generates transactions of type `%s` internally.',
@@ -183,12 +182,8 @@
         'Use `%s` to select this edit type.',
         $type->getEditType());
 
-      $value_type = $type->getValueType();
-      if (!strlen($value_type)) {
-        $value_type = '?';
-      }
-
-      $value_description = $type->getValueDescription();
+      $value_type = $type->getConduitType();
+      $value_description = $type->getConduitTypeDescription();
 
       $table = array();
       $table[] = "| {$key} | {$head_type} | {$description} |";
diff --git a/src/applications/transactions/editengineextension/PhabricatorCommentEditEngineExtension.php b/src/applications/transactions/editengineextension/PhabricatorCommentEditEngineExtension.php
--- a/src/applications/transactions/editengineextension/PhabricatorCommentEditEngineExtension.php
+++ b/src/applications/transactions/editengineextension/PhabricatorCommentEditEngineExtension.php
@@ -41,13 +41,15 @@
     $comment_field = id(new PhabricatorCommentEditField())
       ->setKey('comment')
       ->setLabel(pht('Comments'))
-      ->setDescription(pht('Add comments.'))
       ->setAliases(array('comments'))
       ->setIsHidden(true)
       ->setIsReorderable(false)
       ->setIsDefaultable(false)
       ->setIsLockable(false)
       ->setTransactionType($comment_type)
+      ->setConduitDescription(pht('Make comments.'))
+      ->setConduitTypeDescription(
+        pht('Comment to add, formatted as remarkup.'))
       ->setValue(null);
 
     return array(
diff --git a/src/applications/transactions/editengineextension/PhabricatorEditEngineExtension.php b/src/applications/transactions/editengineextension/PhabricatorEditEngineExtension.php
--- a/src/applications/transactions/editengineextension/PhabricatorEditEngineExtension.php
+++ b/src/applications/transactions/editengineextension/PhabricatorEditEngineExtension.php
@@ -32,6 +32,13 @@
     PhabricatorEditEngine $engine,
     PhabricatorApplicationTransactionInterface $object);
 
+  public function didBuildCustomEditFields(
+    PhabricatorEditEngine $engine,
+    PhabricatorApplicationTransactionInterface $object,
+    array $fields) {
+    return;
+  }
+
   final public static function getAllExtensions() {
     return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
diff --git a/src/applications/transactions/editfield/PhabricatorCommentEditField.php b/src/applications/transactions/editfield/PhabricatorCommentEditField.php
--- a/src/applications/transactions/editfield/PhabricatorCommentEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorCommentEditField.php
@@ -11,6 +11,10 @@
     return new PhabricatorCommentEditType();
   }
 
+  protected function newConduitParameterType() {
+    return new ConduitStringParameterType();
+  }
+
   public function shouldGenerateTransactionsFromSubmit() {
     return false;
   }
diff --git a/src/applications/transactions/editfield/PhabricatorConduitEditField.php b/src/applications/transactions/editfield/PhabricatorConduitEditField.php
--- a/src/applications/transactions/editfield/PhabricatorConduitEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorConduitEditField.php
@@ -11,4 +11,8 @@
     return null;
   }
 
+  protected function newConduitParameterType() {
+    return new ConduitWildParameterType();
+  }
+
 }
diff --git a/src/applications/transactions/editfield/PhabricatorEditField.php b/src/applications/transactions/editfield/PhabricatorEditField.php
--- a/src/applications/transactions/editfield/PhabricatorEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorEditField.php
@@ -12,10 +12,13 @@
   private $object;
   private $transactionType;
   private $metadata = array();
-  private $description;
   private $editTypeKey;
   private $isRequired;
+
+  private $description;
+  private $conduitDescription;
   private $conduitDocumentation;
+  private $conduitTypeDescription;
 
   private $commentActionLabel;
   private $commentActionValue;
@@ -35,6 +38,8 @@
   private $isCopyable = false;
   private $isConduitOnly = false;
 
+  private $conduitEditTypes;
+
   public function setKey($key) {
     $this->key = $key;
     return $this;
@@ -80,15 +85,6 @@
     return $this->object;
   }
 
-  public function setDescription($description) {
-    $this->description = $description;
-    return $this;
-  }
-
-  public function getDescription() {
-    return $this->description;
-  }
-
   public function setIsLocked($is_locked) {
     $this->isLocked = $is_locked;
     return $this;
@@ -125,6 +121,45 @@
     return $this->isConduitOnly;
   }
 
+  public function setDescription($description) {
+    $this->description = $description;
+    return $this;
+  }
+
+  public function getDescription() {
+    return $this->description;
+  }
+
+  public function setConduitDescription($conduit_description) {
+    $this->conduitDescription = $conduit_description;
+    return $this;
+  }
+
+  public function getConduitDescription() {
+    if ($this->conduitDescription === null) {
+      return $this->getDescription();
+    }
+    return $this->conduitDescription;
+  }
+
+  public function setConduitDocumentation($conduit_documentation) {
+    $this->conduitDocumentation = $conduit_documentation;
+    return $this;
+  }
+
+  public function getConduitDocumentation() {
+    return $this->conduitDocumentation;
+  }
+
+  public function setConduitTypeDescription($conduit_type_description) {
+    $this->conduitTypeDescription = $conduit_type_description;
+    return $this;
+  }
+
+  public function getConduitTypeDescription() {
+    return $this->conduitTypeDescription;
+  }
+
   public function setIsEditDefaults($is_edit_defaults) {
     $this->isEditDefaults = $is_edit_defaults;
     return $this;
@@ -516,6 +551,20 @@
     return new AphrontStringHTTPParameterType();
   }
 
+  public function getConduitParameterType() {
+    $type = $this->newConduitParameterType();
+
+    if (!$type) {
+      return null;
+    }
+
+    $type->setViewer($this->getViewer());
+
+    return $type;
+  }
+
+  abstract protected function newConduitParameterType();
+
   public function setEditTypeKey($edit_type_key) {
     $this->editTypeKey = $edit_type_key;
     return $this;
@@ -529,16 +578,13 @@
   }
 
   protected function newEditType() {
-    // TODO: This could be a little cleaner.
-    $http_type = $this->getHTTPParameterType();
-    if ($http_type) {
-      $value_type = $http_type->getTypeName();
-    } else {
-      $value_type = 'wild';
+    $parameter_type = $this->getConduitParameterType();
+    if (!$parameter_type) {
+      return null;
     }
 
     return id(new PhabricatorSimpleEditType())
-      ->setValueType($value_type);
+      ->setConduitParameterType($parameter_type);
   }
 
   protected function getEditType() {
@@ -549,19 +595,49 @@
     }
 
     $type_key = $this->getEditTypeKey();
+    $edit_type = $this->newEditType();
+    if (!$edit_type) {
+      return null;
+    }
 
-    return $this->newEditType()
+    return $edit_type
       ->setEditType($type_key)
       ->setTransactionType($transaction_type)
-      ->setDescription($this->getDescription())
-      ->setMetadata($this->getMetadata())
-      ->setConduitDocumentation($this->getConduitDocumentation());
+      ->setMetadata($this->getMetadata());
+  }
+
+  final public function getConduitEditTypes() {
+    if ($this->conduitEditTypes === null) {
+      $edit_types = $this->newConduitEditTypes();
+      $edit_types = mpull($edit_types, null, 'getEditType');
+
+      foreach ($edit_types as $edit_type) {
+        $edit_type->setEditField($this);
+      }
+
+      $this->conduitEditTypes = $edit_types;
+    }
+
+    return $this->conduitEditTypes;
+  }
+
+  final public function getConduitEditType($key) {
+    $edit_types = $this->getConduitEditTypes();
+
+    if (empty($edit_types[$key])) {
+      throw new Exception(
+        pht(
+          'This EditField does not provide a Conduit EditType with key "%s".',
+          $key));
+    }
+
+    return $edit_types[$key];
   }
 
-  public function getConduitEditTypes() {
+  protected function newConduitEditTypes() {
     $edit_type = $this->getEditType();
 
-    if ($edit_type === null) {
+    if (!$edit_type) {
       return array();
     }
 
@@ -679,13 +755,8 @@
     return $edit_type->generateTransactions($template, $spec);
   }
 
-  public function setConduitDocumentation($conduit_documentation) {
-    $this->conduitDocumentation = $conduit_documentation;
-    return $this;
-  }
 
-  public function getConduitDocumentation() {
-    return $this->conduitDocumentation;
-  }
+
+
 
 }
diff --git a/src/applications/transactions/editfield/PhabricatorInstructionsEditField.php b/src/applications/transactions/editfield/PhabricatorInstructionsEditField.php
--- a/src/applications/transactions/editfield/PhabricatorInstructionsEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorInstructionsEditField.php
@@ -11,4 +11,8 @@
     return null;
   }
 
+  protected function newConduitParameterType() {
+    return null;
+  }
+
 }
diff --git a/src/applications/transactions/editfield/PhabricatorPHIDListEditField.php b/src/applications/transactions/editfield/PhabricatorPHIDListEditField.php
--- a/src/applications/transactions/editfield/PhabricatorPHIDListEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorPHIDListEditField.php
@@ -4,7 +4,6 @@
   extends PhabricatorEditField {
 
   private $useEdgeTransactions;
-  private $transactionDescriptions = array();
   private $isSingleValue;
 
   public function setUseEdgeTransactions($use_edge_transactions) {
@@ -16,15 +15,6 @@
     return $this->useEdgeTransactions;
   }
 
-  public function setEdgeTransactionDescriptions($add, $rem, $set) {
-    $this->transactionDescriptions = array(
-      '+' => $add,
-      '-' => $rem,
-      '=' => $set,
-    );
-    return $this;
-  }
-
   public function setSingleValue($value) {
     if ($value === null) {
       $value = array();
@@ -44,6 +34,10 @@
     return new AphrontPHIDListHTTPParameterType();
   }
 
+  protected function newConduitParameterType() {
+    return new ConduitPHIDListParameterType();
+  }
+
   protected function getValueFromRequest(AphrontRequest $request, $key) {
     $value = parent::getValueFromRequest($request, $key);
     if ($this->getIsSingleValue()) {
@@ -105,9 +99,9 @@
     return $type;
   }
 
-  public function getConduitEditTypes() {
+  protected function newConduitEditTypes() {
     if (!$this->getUseEdgeTransactions()) {
-      return parent::getConduitEditTypes();
+      return parent::newConduitEditTypes();
     }
 
     $transaction_type = $this->getTransactionType();
@@ -116,27 +110,26 @@
     }
 
     $type_key = $this->getEditTypeKey();
-    $strings = $this->transactionDescriptions;
 
     $base = $this->getEditType();
 
     $add = id(clone $base)
       ->setEditType($type_key.'.add')
       ->setEdgeOperation('+')
-      ->setDescription(idx($strings, '+'))
-      ->setValueDescription(pht('List of PHIDs to add.'));
+      ->setConduitTypeDescription(pht('List of PHIDs to add.'))
+      ->setConduitParameterType($this->getConduitParameterType());
 
     $rem = id(clone $base)
       ->setEditType($type_key.'.remove')
       ->setEdgeOperation('-')
-      ->setDescription(idx($strings, '-'))
-      ->setValueDescription(pht('List of PHIDs to remove.'));
+      ->setConduitTypeDescription(pht('List of PHIDs to remove.'))
+      ->setConduitParameterType($this->getConduitParameterType());
 
     $set = id(clone $base)
       ->setEditType($type_key.'.set')
       ->setEdgeOperation('=')
-      ->setDescription(idx($strings, '='))
-      ->setValueDescription(pht('List of PHIDs to set.'));
+      ->setConduitTypeDescription(pht('List of PHIDs to set.'))
+      ->setConduitParameterType($this->getConduitParameterType());
 
     return array(
       $add,
diff --git a/src/applications/transactions/editfield/PhabricatorPolicyEditField.php b/src/applications/transactions/editfield/PhabricatorPolicyEditField.php
--- a/src/applications/transactions/editfield/PhabricatorPolicyEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorPolicyEditField.php
@@ -55,4 +55,9 @@
     return new AphrontPHIDHTTPParameterType();
   }
 
+  protected function newConduitParameterType() {
+    return new ConduitStringParameterType();
+  }
+
+
 }
diff --git a/src/applications/transactions/editfield/PhabricatorProjectsEditField.php b/src/applications/transactions/editfield/PhabricatorProjectsEditField.php
--- a/src/applications/transactions/editfield/PhabricatorProjectsEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorProjectsEditField.php
@@ -11,4 +11,8 @@
     return new AphrontProjectListHTTPParameterType();
   }
 
+  protected function newConduitParameterType() {
+    return new ConduitProjectListParameterType();
+  }
+
 }
diff --git a/src/applications/transactions/editfield/PhabricatorRemarkupEditField.php b/src/applications/transactions/editfield/PhabricatorRemarkupEditField.php
--- a/src/applications/transactions/editfield/PhabricatorRemarkupEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorRemarkupEditField.php
@@ -7,4 +7,8 @@
     return new PhabricatorRemarkupControl();
   }
 
+  protected function newConduitParameterType() {
+    return new ConduitStringParameterType();
+  }
+
 }
diff --git a/src/applications/transactions/editfield/PhabricatorSelectEditField.php b/src/applications/transactions/editfield/PhabricatorSelectEditField.php
--- a/src/applications/transactions/editfield/PhabricatorSelectEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorSelectEditField.php
@@ -31,4 +31,8 @@
       ->setOptions($this->getOptions());
   }
 
+  protected function newConduitParameterType() {
+    return new ConduitStringParameterType();
+  }
+
 }
diff --git a/src/applications/transactions/editfield/PhabricatorSpaceEditField.php b/src/applications/transactions/editfield/PhabricatorSpaceEditField.php
--- a/src/applications/transactions/editfield/PhabricatorSpaceEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorSpaceEditField.php
@@ -13,4 +13,8 @@
     return new AphrontPHIDHTTPParameterType();
   }
 
+  protected function newConduitParameterType() {
+    return new ConduitPHIDParameterType();
+  }
+
 }
diff --git a/src/applications/transactions/editfield/PhabricatorSubscribersEditField.php b/src/applications/transactions/editfield/PhabricatorSubscribersEditField.php
--- a/src/applications/transactions/editfield/PhabricatorSubscribersEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorSubscribersEditField.php
@@ -13,4 +13,8 @@
     return new AphrontUserListHTTPParameterType();
   }
 
+  protected function newConduitParameterType() {
+    return new ConduitUserListParameterType();
+  }
+
 }
diff --git a/src/applications/transactions/editfield/PhabricatorTextAreaEditField.php b/src/applications/transactions/editfield/PhabricatorTextAreaEditField.php
--- a/src/applications/transactions/editfield/PhabricatorTextAreaEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorTextAreaEditField.php
@@ -39,4 +39,8 @@
     return $control;
   }
 
+  protected function newConduitParameterType() {
+    return new ConduitStringParameterType();
+  }
+
 }
diff --git a/src/applications/transactions/editfield/PhabricatorTextEditField.php b/src/applications/transactions/editfield/PhabricatorTextEditField.php
--- a/src/applications/transactions/editfield/PhabricatorTextEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorTextEditField.php
@@ -7,4 +7,8 @@
     return new AphrontFormTextControl();
   }
 
+  protected function newConduitParameterType() {
+    return new ConduitStringParameterType();
+  }
+
 }
diff --git a/src/applications/transactions/editfield/PhabricatorUsersEditField.php b/src/applications/transactions/editfield/PhabricatorUsersEditField.php
--- a/src/applications/transactions/editfield/PhabricatorUsersEditField.php
+++ b/src/applications/transactions/editfield/PhabricatorUsersEditField.php
@@ -11,4 +11,8 @@
     return new AphrontUserListHTTPParameterType();
   }
 
+  protected function newConduitParameterType() {
+    return new ConduitUserListParameterType();
+  }
+
 }
diff --git a/src/applications/transactions/edittype/PhabricatorCommentEditType.php b/src/applications/transactions/edittype/PhabricatorCommentEditType.php
--- a/src/applications/transactions/edittype/PhabricatorCommentEditType.php
+++ b/src/applications/transactions/edittype/PhabricatorCommentEditType.php
@@ -2,8 +2,8 @@
 
 final class PhabricatorCommentEditType extends PhabricatorEditType {
 
-  public function getValueType() {
-    return id(new AphrontStringHTTPParameterType())->getTypeName();
+  protected function newConduitParameterType() {
+    return new ConduitStringParameterType();
   }
 
   public function generateTransactions(
@@ -19,8 +19,4 @@
     return array($xaction);
   }
 
-  public function getValueDescription() {
-    return pht('Comment to add, formated as remarkup.');
-  }
-
 }
diff --git a/src/applications/transactions/edittype/PhabricatorEdgeEditType.php b/src/applications/transactions/edittype/PhabricatorEdgeEditType.php
--- a/src/applications/transactions/edittype/PhabricatorEdgeEditType.php
+++ b/src/applications/transactions/edittype/PhabricatorEdgeEditType.php
@@ -34,13 +34,4 @@
     return array($xaction);
   }
 
-  public function setValueDescription($value_description) {
-    $this->valueDescription = $value_description;
-    return $this;
-  }
-
-  public function getValueDescription() {
-    return $this->valueDescription;
-  }
-
 }
diff --git a/src/applications/transactions/edittype/PhabricatorEditType.php b/src/applications/transactions/edittype/PhabricatorEditType.php
--- a/src/applications/transactions/edittype/PhabricatorEditType.php
+++ b/src/applications/transactions/edittype/PhabricatorEditType.php
@@ -3,34 +3,16 @@
 abstract class PhabricatorEditType extends Phobject {
 
   private $editType;
+  private $editField;
   private $transactionType;
   private $label;
   private $field;
-  private $description;
-  private $summary;
   private $metadata = array();
-  private $conduitDocumentation;
-
-  public function setDescription($description) {
-    $this->description = $description;
-    return $this;
-  }
-
-  public function getDescription() {
-    return $this->description;
-  }
-
-  public function setSummary($summary) {
-    $this->summary = $summary;
-    return $this;
-  }
 
-  public function getSummary() {
-    if ($this->summary === null) {
-      return $this->getDescription();
-    }
-    return $this->summary;
-  }
+  private $conduitDescription;
+  private $conduitDocumentation;
+  private $conduitTypeDescription;
+  private $conduitParameterType;
 
   public function setLabel($label) {
     $this->label = $label;
@@ -59,15 +41,6 @@
     return $this->editType;
   }
 
-  public function setConduitDocumentation($conduit_documentation) {
-    $this->conduitDocumentation = $conduit_documentation;
-    return $this;
-  }
-
-  public function getConduitDocumentation() {
-    return $this->conduitDocumentation;
-  }
-
   public function setMetadata($metadata) {
     $this->metadata = $metadata;
     return $this;
@@ -90,9 +63,6 @@
     PhabricatorApplicationTransaction $template,
     array $spec);
 
-  abstract public function getValueType();
-  abstract public function getValueDescription();
-
   protected function newTransaction(
     PhabricatorApplicationTransaction $template) {
 
@@ -106,4 +76,83 @@
     return $xaction;
   }
 
+  public function setEditField(PhabricatorEditField $edit_field) {
+    $this->editField = $edit_field;
+    return $this;
+  }
+
+  public function getEditField() {
+    return $this->editField;
+  }
+
+/* -(  Conduit  )------------------------------------------------------------ */
+
+
+  protected function newConduitParameterType() {
+    if ($this->conduitParameterType) {
+      return clone $this->conduitParameterType;
+    }
+
+    return null;
+  }
+
+  public function setConduitParameterType(ConduitParameterType $type) {
+    $this->conduitParameterType = $type;
+    return $this;
+  }
+
+  public function getConduitParameterType() {
+    return $this->newConduitParameterType();
+  }
+
+  public function getConduitType() {
+    $parameter_type = $this->getConduitParameterType();
+    return $parameter_type->getTypeName();
+  }
+
+  public function setConduitTypeDescription($conduit_type_description) {
+    $this->conduitTypeDescription = $conduit_type_description;
+    return $this;
+  }
+
+  public function getConduitTypeDescription() {
+    if ($this->conduitTypeDescription === null) {
+      if ($this->getEditField()) {
+        return $this->getEditField()->getConduitTypeDescription();
+      }
+    }
+
+    return $this->conduitTypeDescription;
+  }
+
+  public function setConduitDescription($conduit_description) {
+    $this->conduitDescription = $conduit_description;
+    return $this;
+  }
+
+  public function getConduitDescription() {
+    if ($this->conduitDescription === null) {
+      if ($this->getEditField()) {
+        return $this->getEditField()->getConduitDescription();
+      }
+    }
+
+    return $this->conduitDescription;
+  }
+
+  public function setConduitDocumentation($conduit_documentation) {
+    $this->conduitDocumentation = $conduit_documentation;
+    return $this;
+  }
+
+  public function getConduitDocumentation() {
+    if ($this->conduitDocumentation === null) {
+      if ($this->getEditField()) {
+        return $this->getEditField()->getConduitDocumentation();
+      }
+    }
+
+    return $this->conduitDocumentation;
+  }
+
 }
diff --git a/src/applications/transactions/edittype/PhabricatorPHIDListEditType.php b/src/applications/transactions/edittype/PhabricatorPHIDListEditType.php
--- a/src/applications/transactions/edittype/PhabricatorPHIDListEditType.php
+++ b/src/applications/transactions/edittype/PhabricatorPHIDListEditType.php
@@ -42,4 +42,17 @@
     }
   }
 
+  protected function newConduitParameterType() {
+    $default = parent::newConduitParameterType();
+    if ($default) {
+      return $default;
+    }
+
+    if ($this->getIsSingleValue()) {
+      return new ConduitPHIDParameterType();
+    } else {
+      return new ConduitPHIDListParameterType();
+    }
+  }
+
 }
diff --git a/src/applications/transactions/edittype/PhabricatorSimpleEditType.php b/src/applications/transactions/edittype/PhabricatorSimpleEditType.php
--- a/src/applications/transactions/edittype/PhabricatorSimpleEditType.php
+++ b/src/applications/transactions/edittype/PhabricatorSimpleEditType.php
@@ -2,20 +2,6 @@
 
 final class PhabricatorSimpleEditType extends PhabricatorEditType {
 
-  private $valueType;
-  private $valueDescription;
-  private $phuixControlType;
-  private $phuixControlSpecification = array();
-
-  public function setValueType($value_type) {
-    $this->valueType = $value_type;
-    return $this;
-  }
-
-  public function getValueType() {
-    return $this->valueType;
-  }
-
   public function generateTransactions(
     PhabricatorApplicationTransaction $template,
     array $spec) {
@@ -26,13 +12,4 @@
     return array($edit);
   }
 
-  public function setValueDescription($value_description) {
-    $this->valueDescription = $value_description;
-    return $this;
-  }
-
-  public function getValueDescription() {
-    return $this->valueDescription;
-  }
-
 }
diff --git a/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditField.php b/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditField.php
--- a/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditField.php
+++ b/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditField.php
@@ -5,6 +5,7 @@
 
   private $customField;
   private $httpParameterType;
+  private $conduitParameterType;
 
   public function setCustomField(PhabricatorCustomField $custom_field) {
     $this->customField = $custom_field;
@@ -25,6 +26,16 @@
     return $this->httpParameterType;
   }
 
+  public function setCustomFieldConduitParameterType(
+    ConduitParameterType $type) {
+    $this->conduitParameterType = $type;
+    return $this;
+  }
+
+  public function getCustomFieldConduitParameterType() {
+    return $this->conduitParameterType;
+  }
+
   protected function buildControl() {
     $field = $this->getCustomField();
     $clone = clone $field;
@@ -36,14 +47,15 @@
   }
 
   protected function newEditType() {
-    $type = id(new PhabricatorCustomFieldEditType())
-      ->setCustomField($this->getCustomField());
-
-    $http_type = $this->getHTTPParameterType();
-    if ($http_type) {
-      $type->setValueType($http_type->getTypeName());
+    $conduit_type = $this->newConduitParameterType();
+    if (!$conduit_type) {
+      return null;
     }
 
+    $type = id(new PhabricatorCustomFieldEditType())
+      ->setCustomField($this->getCustomField())
+      ->setConduitParameterType($conduit_type);
+
     return $type;
   }
 
@@ -71,14 +83,14 @@
     return $clone->getNewValueForApplicationTransactions();
   }
 
-  public function getConduitEditTypes() {
+  protected function newConduitEditTypes() {
     $field = $this->getCustomField();
 
     if (!$field->shouldAppearInConduitTransactions()) {
       return array();
     }
 
-    return parent::getConduitEditTypes();
+    return parent::newConduitEditTypes();
   }
 
   protected function newHTTPParameterType() {
@@ -91,6 +103,16 @@
     return null;
   }
 
+  protected function newConduitParameterType() {
+    $type = $this->getCustomFieldConduitParameterType();
+
+    if ($type) {
+      return clone $type;
+    }
+
+    return null;
+  }
+
   public function getAllReadValueFromRequestKeys() {
     $keys = array();
 
diff --git a/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditType.php b/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditType.php
--- a/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditType.php
+++ b/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditType.php
@@ -4,7 +4,6 @@
   extends PhabricatorEditType {
 
   private $customField;
-  private $valueType;
 
   public function setCustomField(PhabricatorCustomField $custom_field) {
     $this->customField = $custom_field;
@@ -15,25 +14,11 @@
     return $this->customField;
   }
 
-  public function setValueType($value_type) {
-    $this->valueType = $value_type;
-    return $this;
-  }
-
-  public function getValueType() {
-    return $this->valueType;
-  }
-
   public function getMetadata() {
     $field = $this->getCustomField();
     return parent::getMetadata() + $field->getApplicationTransactionMetadata();
   }
 
-  public function getValueDescription() {
-    $field = $this->getCustomField();
-    return $field->getFieldDescription();
-  }
-
   public function generateTransactions(
     PhabricatorApplicationTransaction $template,
     array $spec) {
diff --git a/src/infrastructure/customfield/field/PhabricatorCustomField.php b/src/infrastructure/customfield/field/PhabricatorCustomField.php
--- a/src/infrastructure/customfield/field/PhabricatorCustomField.php
+++ b/src/infrastructure/customfield/field/PhabricatorCustomField.php
@@ -1106,6 +1106,11 @@
       $field->setCustomFieldHTTPParameterType($http_type);
     }
 
+    $conduit_type = $this->getConduitEditParameterType();
+    if ($conduit_type) {
+      $field->setCustomFieldConduitParameterType($conduit_type);
+    }
+
     return $field;
   }
 
@@ -1348,6 +1353,17 @@
     return null;
   }
 
+  public function getConduitEditParameterType() {
+    return $this->newConduitEditParameterType();
+  }
+
+  protected function newConduitEditParameterType() {
+    if ($this->proxy) {
+      return $this->proxy->newConduitEditParameterType();
+    }
+    return null;
+  }
+
 
 /* -(  Herald  )------------------------------------------------------------- */
 
diff --git a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldBool.php b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldBool.php
--- a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldBool.php
+++ b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldBool.php
@@ -136,4 +136,9 @@
   protected function newConduitSearchParameterType() {
     return new ConduitBoolParameterType();
   }
+
+  protected function newConduitEditParameterType() {
+    return new ConduitBoolParameterType();
+  }
+
 }
diff --git a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldDate.php b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldDate.php
--- a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldDate.php
+++ b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldDate.php
@@ -202,4 +202,8 @@
     return null;
   }
 
+  protected function newConduitEditParameterType() {
+    return new ConduitEpochParameterType();
+  }
+
 }
diff --git a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldInt.php b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldInt.php
--- a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldInt.php
+++ b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldInt.php
@@ -120,4 +120,8 @@
     return new ConduitIntParameterType();
   }
 
+  protected function newConduitEditParameterType() {
+    return new ConduitIntParameterType();
+  }
+
 }
diff --git a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldLink.php b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldLink.php
--- a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldLink.php
+++ b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldLink.php
@@ -87,4 +87,9 @@
   protected function newConduitSearchParameterType() {
     return new ConduitStringListParameterType();
   }
+
+  protected function newConduitEditParameterType() {
+    return new ConduitStringParameterType();
+  }
+
 }
diff --git a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldSelect.php b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldSelect.php
--- a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldSelect.php
+++ b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldSelect.php
@@ -143,4 +143,9 @@
   protected function newConduitSearchParameterType() {
     return new ConduitStringListParameterType();
   }
+
+  protected function newConduitEditParameterType() {
+    return new ConduitStringParameterType();
+  }
+
 }
diff --git a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldUsers.php b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldUsers.php
--- a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldUsers.php
+++ b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldUsers.php
@@ -19,4 +19,8 @@
     return new ConduitUserListParameterType();
   }
 
+  protected function newConduitEditParameterType() {
+    return new ConduitUserListParameterType();
+  }
+
 }