diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index ace26640ae..0fa26a383a 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1417,6 +1417,7 @@ phutil_register_library_map(array(
     'OwnersEditConduitAPIMethod' => 'applications/owners/conduit/OwnersEditConduitAPIMethod.php',
     'OwnersPackageReplyHandler' => 'applications/owners/mail/OwnersPackageReplyHandler.php',
     'OwnersQueryConduitAPIMethod' => 'applications/owners/conduit/OwnersQueryConduitAPIMethod.php',
+    'OwnersSearchConduitAPIMethod' => 'applications/owners/conduit/OwnersSearchConduitAPIMethod.php',
     'PHIDConduitAPIMethod' => 'applications/phid/conduit/PHIDConduitAPIMethod.php',
     'PHIDInfoConduitAPIMethod' => 'applications/phid/conduit/PHIDInfoConduitAPIMethod.php',
     'PHIDLookupConduitAPIMethod' => 'applications/phid/conduit/PHIDLookupConduitAPIMethod.php',
@@ -1993,7 +1994,7 @@ phutil_register_library_map(array(
     'PhabricatorCustomFieldAttachment' => 'infrastructure/customfield/field/PhabricatorCustomFieldAttachment.php',
     'PhabricatorCustomFieldConfigOptionType' => 'infrastructure/customfield/config/PhabricatorCustomFieldConfigOptionType.php',
     'PhabricatorCustomFieldDataNotAvailableException' => 'infrastructure/customfield/exception/PhabricatorCustomFieldDataNotAvailableException.php',
-    'PhabricatorCustomFieldEditEngineExtension' => 'infrastructure/customfield/editor/PhabricatorCustomFieldEditEngineExtension.php',
+    'PhabricatorCustomFieldEditEngineExtension' => 'infrastructure/customfield/engineextension/PhabricatorCustomFieldEditEngineExtension.php',
     'PhabricatorCustomFieldEditField' => 'infrastructure/customfield/editor/PhabricatorCustomFieldEditField.php',
     'PhabricatorCustomFieldEditType' => 'infrastructure/customfield/editor/PhabricatorCustomFieldEditType.php',
     'PhabricatorCustomFieldHeraldField' => 'infrastructure/customfield/herald/PhabricatorCustomFieldHeraldField.php',
@@ -2006,6 +2007,7 @@ phutil_register_library_map(array(
     'PhabricatorCustomFieldNotAttachedException' => 'infrastructure/customfield/exception/PhabricatorCustomFieldNotAttachedException.php',
     'PhabricatorCustomFieldNotProxyException' => 'infrastructure/customfield/exception/PhabricatorCustomFieldNotProxyException.php',
     'PhabricatorCustomFieldNumericIndexStorage' => 'infrastructure/customfield/storage/PhabricatorCustomFieldNumericIndexStorage.php',
+    'PhabricatorCustomFieldSearchEngineExtension' => 'infrastructure/customfield/engineextension/PhabricatorCustomFieldSearchEngineExtension.php',
     'PhabricatorCustomFieldStorage' => 'infrastructure/customfield/storage/PhabricatorCustomFieldStorage.php',
     'PhabricatorCustomFieldStringIndexStorage' => 'infrastructure/customfield/storage/PhabricatorCustomFieldStringIndexStorage.php',
     'PhabricatorCustomHeaderConfigType' => 'applications/config/custom/PhabricatorCustomHeaderConfigType.php',
@@ -5439,6 +5441,7 @@ phutil_register_library_map(array(
     'OwnersEditConduitAPIMethod' => 'PhabricatorEditEngineAPIMethod',
     'OwnersPackageReplyHandler' => 'PhabricatorMailReplyHandler',
     'OwnersQueryConduitAPIMethod' => 'OwnersConduitAPIMethod',
+    'OwnersSearchConduitAPIMethod' => 'PhabricatorSearchEngineAPIMethod',
     'PHIDConduitAPIMethod' => 'ConduitAPIMethod',
     'PHIDInfoConduitAPIMethod' => 'PHIDConduitAPIMethod',
     'PHIDLookupConduitAPIMethod' => 'PHIDConduitAPIMethod',
@@ -6116,6 +6119,7 @@ phutil_register_library_map(array(
     'PhabricatorCustomFieldNotAttachedException' => 'Exception',
     'PhabricatorCustomFieldNotProxyException' => 'Exception',
     'PhabricatorCustomFieldNumericIndexStorage' => 'PhabricatorCustomFieldIndexStorage',
+    'PhabricatorCustomFieldSearchEngineExtension' => 'PhabricatorSearchEngineExtension',
     'PhabricatorCustomFieldStorage' => 'PhabricatorLiskDAO',
     'PhabricatorCustomFieldStringIndexStorage' => 'PhabricatorCustomFieldIndexStorage',
     'PhabricatorCustomHeaderConfigType' => 'PhabricatorConfigOptionType',
@@ -6791,6 +6795,7 @@ phutil_register_library_map(array(
       'PhabricatorApplicationTransactionInterface',
       'PhabricatorCustomFieldInterface',
       'PhabricatorDestructibleInterface',
+      'PhabricatorConduitResultInterface',
     ),
     'PhabricatorOwnersPackageDatasource' => 'PhabricatorTypeaheadDatasource',
     'PhabricatorOwnersPackageEditEngine' => 'PhabricatorEditEngine',
diff --git a/src/applications/owners/conduit/OwnersSearchConduitAPIMethod.php b/src/applications/owners/conduit/OwnersSearchConduitAPIMethod.php
new file mode 100644
index 0000000000..8fef33e4bc
--- /dev/null
+++ b/src/applications/owners/conduit/OwnersSearchConduitAPIMethod.php
@@ -0,0 +1,18 @@
+<?php
+
+final class OwnersSearchConduitAPIMethod
+  extends PhabricatorSearchEngineAPIMethod {
+
+  public function getAPIMethodName() {
+    return 'owners.search';
+  }
+
+  public function newSearchEngine() {
+    return new PhabricatorOwnersPackageSearchEngine();
+  }
+
+  public function getMethodSummary() {
+    return pht('Read information about Owners packages.');
+  }
+
+}
diff --git a/src/applications/owners/storage/PhabricatorOwnersPackage.php b/src/applications/owners/storage/PhabricatorOwnersPackage.php
index f4ae31b3b6..cd63ff42fc 100644
--- a/src/applications/owners/storage/PhabricatorOwnersPackage.php
+++ b/src/applications/owners/storage/PhabricatorOwnersPackage.php
@@ -6,7 +6,8 @@ final class PhabricatorOwnersPackage
     PhabricatorPolicyInterface,
     PhabricatorApplicationTransactionInterface,
     PhabricatorCustomFieldInterface,
-    PhabricatorDestructibleInterface {
+    PhabricatorDestructibleInterface,
+    PhabricatorConduitResultInterface {
 
   protected $name;
   protected $originalName;
@@ -365,4 +366,33 @@ final class PhabricatorOwnersPackage
     $this->saveTransaction();
   }
 
+
+/* -(  PhabricatorConduitResultInterface  )---------------------------------- */
+
+
+  public function getFieldSpecificationsForConduit() {
+    return array(
+      'name' => array(
+        'type' => 'string',
+        'description' => pht('The name of the package.'),
+      ),
+      'description' => array(
+        'type' => 'string',
+        'description' => pht('The package description.'),
+      ),
+      'status' => array(
+        'type' => 'string',
+        'description' => pht('Active or archived status of the package.'),
+      ),
+    );
+  }
+
+  public function getFieldValuesForConduit() {
+    return array(
+      'name' => $this->getName(),
+      'description' => $this->getDescription(),
+      'status' => $this->getStatus(),
+    );
+  }
+
 }
diff --git a/src/applications/search/engine/PhabricatorApplicationSearchEngine.php b/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
index f3afb97802..a2462c937a 100644
--- a/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
+++ b/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
@@ -1174,6 +1174,14 @@ abstract class PhabricatorApplicationSearchEngine extends Phobject {
 
   public function getSearchFieldsForConduit() {
     $fields = $this->buildSearchFields();
+
+    // These are handled separately for Conduit, so don't show them as
+    // supported.
+    unset($fields['ids']);
+    unset($fields['phids']);
+    unset($fields['order']);
+    unset($fields['limit']);
+
     return $fields;
   }
 
@@ -1220,6 +1228,7 @@ abstract class PhabricatorApplicationSearchEngine extends Phobject {
     $query = $this->buildQueryFromSavedQuery($saved_query);
     $pager = $this->newPagerForSavedQuery($saved_query);
 
+    $this->setAutomaticConstraintsForConduit($query, $request, $constraints);
     $this->setQueryOrderForConduit($query, $request);
     $this->setPagerLimitForConduit($pager, $request);
     $this->setPagerOffsetsForConduit($pager, $request);
@@ -1269,6 +1278,12 @@ abstract class PhabricatorApplicationSearchEngine extends Phobject {
 
     $field_extensions = array();
     foreach ($extensions as $key => $extension) {
+      $extension->setViewer($this->requireViewer());
+
+      if (!$extension->supportsObject($object)) {
+        continue;
+      }
+
       if ($extension->getFieldSpecificationsForConduit($object)) {
         $field_extensions[$key] = $extension;
       }
@@ -1277,6 +1292,22 @@ abstract class PhabricatorApplicationSearchEngine extends Phobject {
     return $field_extensions;
   }
 
+  private function setAutomaticConstraintsForConduit(
+    $query,
+    ConduitAPIRequest $request,
+    array $constraints) {
+
+    $with_ids = idx($constraints, 'ids');
+    if ($with_ids) {
+      $query->withIDs($with_ids);
+    }
+
+    $with_phids = idx($constraints, 'phids');
+    if ($with_phids) {
+      $query->withPHIDs($with_phids);
+    }
+  }
+
   private function setQueryOrderForConduit($query, ConduitAPIRequest $request) {
     $order = $request->getValue('order');
     if ($order === null) {
diff --git a/src/applications/search/engine/PhabricatorSearchEngineAPIMethod.php b/src/applications/search/engine/PhabricatorSearchEngineAPIMethod.php
index 2159e54261..ae27cb07c0 100644
--- a/src/applications/search/engine/PhabricatorSearchEngineAPIMethod.php
+++ b/src/applications/search/engine/PhabricatorSearchEngineAPIMethod.php
@@ -143,13 +143,18 @@ EOTEXT
     $head_type = pht('Type');
     $head_desc = pht('Description');
 
+    $desc_ids = pht('Search for specific objects by ID.');
+    $desc_phids = pht('Search for specific objects by PHID.');
+
     $fields = $engine->getSearchFieldsForConduit();
 
     $table = array();
     $table[] = "| {$head_key} | {$head_label} | {$head_type} | {$head_desc} |";
     $table[] = '|-------------|---------------|--------------|--------------|';
+    $table[] = "| `ids` | **IDs** | `list<int>` | {$desc_ids} |";
+    $table[] = "| `phids` | **PHIDs** | `list<phid>` | {$desc_phids} |";
     foreach ($fields as $field) {
-      $key = $field->getKey();
+      $key = $field->getKeyForConduit();
       $label = $field->getLabel();
 
       // TODO: Support generating and surfacing this information.
diff --git a/src/applications/search/field/PhabricatorSearchCustomFieldProxyField.php b/src/applications/search/field/PhabricatorSearchCustomFieldProxyField.php
index 15cbfcb09e..a612753f84 100644
--- a/src/applications/search/field/PhabricatorSearchCustomFieldProxyField.php
+++ b/src/applications/search/field/PhabricatorSearchCustomFieldProxyField.php
@@ -26,6 +26,10 @@ final class PhabricatorSearchCustomFieldProxyField
     return $this;
   }
 
+  public function getLabel() {
+    return $this->getCustomField()->getFieldName();
+  }
+
   public function getCustomField() {
     return $this->customField;
   }
@@ -34,6 +38,10 @@ final class PhabricatorSearchCustomFieldProxyField
     return null;
   }
 
+  public function getKeyForConduit() {
+    return $this->getCustomField()->getModernFieldKey();
+  }
+
   protected function getValueExistsInRequest(AphrontRequest $request, $key) {
     // TODO: For historical reasons, the keys we look for don't line up with
     // the keys that CustomFields use. Just skip the check for existence and
diff --git a/src/applications/search/field/PhabricatorSearchField.php b/src/applications/search/field/PhabricatorSearchField.php
index b6e3e67c4a..0917ac488e 100644
--- a/src/applications/search/field/PhabricatorSearchField.php
+++ b/src/applications/search/field/PhabricatorSearchField.php
@@ -271,4 +271,14 @@ abstract class PhabricatorSearchField extends Phobject {
 
     return $list;
   }
+
+
+  public function getKeyForConduit() {
+    // TODO: This shouldn't really be different, but internal handling of
+    // custom field keys is a bit of a mess for now.
+    return $this->getKey();
+  }
+
+
+
 }
diff --git a/src/infrastructure/customfield/editor/PhabricatorCustomFieldEditEngineExtension.php b/src/infrastructure/customfield/engineextension/PhabricatorCustomFieldEditEngineExtension.php
similarity index 100%
rename from src/infrastructure/customfield/editor/PhabricatorCustomFieldEditEngineExtension.php
rename to src/infrastructure/customfield/engineextension/PhabricatorCustomFieldEditEngineExtension.php
diff --git a/src/infrastructure/customfield/engineextension/PhabricatorCustomFieldSearchEngineExtension.php b/src/infrastructure/customfield/engineextension/PhabricatorCustomFieldSearchEngineExtension.php
new file mode 100644
index 0000000000..5601f26729
--- /dev/null
+++ b/src/infrastructure/customfield/engineextension/PhabricatorCustomFieldSearchEngineExtension.php
@@ -0,0 +1,58 @@
+<?php
+
+final class PhabricatorCustomFieldSearchEngineExtension
+  extends PhabricatorSearchEngineExtension {
+
+  const EXTENSIONKEY = 'customfield';
+
+  public function isExtensionEnabled() {
+    return true;
+  }
+
+  public function getExtensionName() {
+    return pht('Support for Custom Fields');
+  }
+
+  public function supportsObject($object) {
+    return ($object instanceof PhabricatorCustomFieldInterface);
+  }
+
+  public function getFieldSpecificationsForConduit($object) {
+    $fields = PhabricatorCustomField::getObjectFields(
+      $object,
+      PhabricatorCustomField::ROLE_CONDUIT);
+
+    $map = array();
+    foreach ($fields->getFields() as $field) {
+      $key = $field->getModernFieldKey();
+      $map[$key] = array(
+        'type' => 'wild',
+        'description' => $field->getFieldDescription(),
+      );
+    }
+
+    return $map;
+  }
+
+  public function getFieldValuesForConduit($object) {
+    // TODO: This is currently very inefficient. We should bulk-load these
+    // field values instead.
+
+    $fields = PhabricatorCustomField::getObjectFields(
+      $object,
+      PhabricatorCustomField::ROLE_CONDUIT);
+
+    $fields
+      ->setViewer($this->getViewer())
+      ->readFieldsFromStorage($object);
+
+    $map = array();
+    foreach ($fields->getFields() as $field) {
+      $key = $field->getModernFieldKey();
+      $map[$key] = $field->getConduitDictionaryValue();
+    }
+
+    return $map;
+  }
+
+}
diff --git a/src/infrastructure/customfield/field/PhabricatorCustomField.php b/src/infrastructure/customfield/field/PhabricatorCustomField.php
index f3bf787e72..edc077ff6f 100644
--- a/src/infrastructure/customfield/field/PhabricatorCustomField.php
+++ b/src/infrastructure/customfield/field/PhabricatorCustomField.php
@@ -188,6 +188,13 @@ abstract class PhabricatorCustomField extends Phobject {
       $field_key_is_incomplete = true);
   }
 
+  public function getModernFieldKey() {
+    if ($this->proxy) {
+      return $this->proxy->getModernFieldKey();
+    }
+    return $this->getFieldKey();
+  }
+
 
   /**
    * Return a human-readable field name.
@@ -199,7 +206,7 @@ abstract class PhabricatorCustomField extends Phobject {
     if ($this->proxy) {
       return $this->proxy->getFieldName();
     }
-    return $this->getFieldKey();
+    return $this->getModernFieldKey();
   }
 
 
@@ -1109,7 +1116,7 @@ abstract class PhabricatorCustomField extends Phobject {
 
     return $this->newEditField()
       ->setKey($this->getFieldKey())
-      ->setEditTypeKey('custom.'.$this->getFieldKey())
+      ->setEditTypeKey($this->getModernFieldKey())
       ->setLabel($this->getFieldName())
       ->setDescription($this->getFieldDescription())
       ->setTransactionType($this->getApplicationTransactionType())
diff --git a/src/infrastructure/customfield/standard/PhabricatorStandardCustomField.php b/src/infrastructure/customfield/standard/PhabricatorStandardCustomField.php
index 37c22b8ca3..302607acfa 100644
--- a/src/infrastructure/customfield/standard/PhabricatorStandardCustomField.php
+++ b/src/infrastructure/customfield/standard/PhabricatorStandardCustomField.php
@@ -440,7 +440,7 @@ abstract class PhabricatorStandardCustomField
   }
 
   protected function newStandardEditField() {
-    $short = 'custom.'.$this->getRawStandardFieldKey();
+    $short = $this->getModernFieldKey();
 
     return parent::newStandardEditField()
       ->setEditTypeKey($short)
@@ -451,4 +451,16 @@ abstract class PhabricatorStandardCustomField
     return true;
   }
 
+  public function shouldAppearInConduitDictionary() {
+    return true;
+  }
+
+  public function getModernFieldKey() {
+    return 'custom.'.$this->getRawStandardFieldKey();
+  }
+
+  public function getConduitDictionaryValue() {
+    return $this->getFieldValue();
+  }
+
 }
diff --git a/src/infrastructure/query/policy/PhabricatorCursorPagedPolicyAwareQuery.php b/src/infrastructure/query/policy/PhabricatorCursorPagedPolicyAwareQuery.php
index ac086a46fa..8a2edd4575 100644
--- a/src/infrastructure/query/policy/PhabricatorCursorPagedPolicyAwareQuery.php
+++ b/src/infrastructure/query/policy/PhabricatorCursorPagedPolicyAwareQuery.php
@@ -716,13 +716,13 @@ abstract class PhabricatorCursorPagedPolicyAwareQuery
           continue;
         }
 
-        $key = $field->getFieldKey();
-        $digest = $field->getFieldIndex();
+        $legacy_key = 'custom:'.$field->getFieldKey();
+        $modern_key = $field->getModernFieldKey();
 
-        $full_key = 'custom:'.$key;
-        $orders[$full_key] = array(
-          'vector' => array($full_key, 'id'),
+        $orders[$modern_key] = array(
+          'vector' => array($modern_key, 'id'),
           'name' => $field->getFieldName(),
+          'aliases' => array($legacy_key),
         );
       }
     }
@@ -903,11 +903,11 @@ abstract class PhabricatorCursorPagedPolicyAwareQuery
           continue;
         }
 
-        $key = $field->getFieldKey();
         $digest = $field->getFieldIndex();
 
-        $full_key = 'custom:'.$key;
-        $columns[$full_key] = array(
+        $key = $field->getModernFieldKey();
+
+        $columns[$key] = array(
           'table' => 'appsearch_order_'.$digest,
           'column' => 'indexValue',
           'type' => $index->getIndexValueType(),