diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index 513df7fd..e5a92876 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -21,6 +21,7 @@ phutil_register_library_map(array(
     'ArcanistCapabilityNotSupportedException' => 'workflow/exception/notsupported',
     'ArcanistChooseInvalidRevisionException' => 'exception',
     'ArcanistChooseNoRevisionsException' => 'exception',
+    'ArcanistCloseWorkflow' => 'workflow/close',
     'ArcanistCommitWorkflow' => 'workflow/commit',
     'ArcanistConduitLinter' => 'lint/linter/conduit',
     'ArcanistConfiguration' => 'configuration',
@@ -126,6 +127,7 @@ phutil_register_library_map(array(
     'ArcanistBranchWorkflow' => 'ArcanistBaseWorkflow',
     'ArcanistBundleTestCase' => 'ArcanistPhutilTestCase',
     'ArcanistCallConduitWorkflow' => 'ArcanistBaseWorkflow',
+    'ArcanistCloseWorkflow' => 'ArcanistBaseWorkflow',
     'ArcanistCommitWorkflow' => 'ArcanistBaseWorkflow',
     'ArcanistConduitLinter' => 'ArcanistLinter',
     'ArcanistCoverWorkflow' => 'ArcanistBaseWorkflow',
diff --git a/src/workflow/close/ArcanistCloseWorkflow.php b/src/workflow/close/ArcanistCloseWorkflow.php
new file mode 100644
index 00000000..ee2d052f
--- /dev/null
+++ b/src/workflow/close/ArcanistCloseWorkflow.php
@@ -0,0 +1,138 @@
+<?php
+
+/*
+ * Copyright 2012 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Close a task
+ *
+ * @group workflow
+ */
+final class ArcanistCloseWorkflow extends ArcanistBaseWorkflow {
+
+  private $tasks;
+  private $statusOptions = array(
+    "resolved"  => 1,
+    "wontfix"   => 2,
+    "invalid"   => 3,
+    "duplicate" => 4,
+    "spite"     => 5,
+    "open"      => 0
+    );
+
+  public function getCommandSynopses() {
+    return phutil_console_format(<<<EOTEXT
+      **close** __task_id__ [__options__]
+EOTEXT
+      );
+  }
+
+  public function getCommandHelp() {
+    return phutil_console_format(<<<EOTEXT
+        Close a task.
+EOTEXT
+      );
+  }
+
+  public function requiresConduit() {
+    return true;
+  }
+
+  public function requiresRepositoryAPI() {
+    return false;
+  }
+
+  public function requiresAuthentication() {
+    return true;
+  }
+
+
+  public function getArguments() {
+    $options = array_keys($this->statusOptions);
+    $last = array_pop($options);
+    return array(
+      '*' => 'task_id',
+      'message' => array(
+        'short' => 'm',
+        'param' => 'comment',
+        'help'  => "Provide a comment with your status change.",
+      ),
+      'status'  => array(
+        'param' => 'status',
+        'short' => 's',
+        'help'  => "New status. Valid options are ".
+          implode(', ', $options).", or {$last}. Default is resolved.\n"
+      ),
+    );
+  }
+
+  public function run() {
+    $ids = $this->getArgument('task_id');
+    $message = $this->getArgument('message');
+    $status = strtolower($this->getArgument('status'));
+
+    if (!isset($status) || $status == '') {
+      $status = head_key($this->statusOptions);
+    }
+
+    if (isset($this->statusOptions[$status])) {
+      $status = $this->statusOptions[$status];
+    } else {
+      $options = array_keys($this->statusOptions);
+      $last = array_pop($options);
+      echo "Invalid status {$status}, valid options are ".
+        implode(', ', $options).", or {$last}.\n";
+      return;
+    }
+
+    foreach ($ids as $id) {
+      if (!preg_match("/^T?\d+$/", $id)) {
+        echo "Invalid Task ID: {$id}.\n";
+        return 1;
+      }
+      $id = ltrim($id, 'T');
+      $result = $this->closeTask($id, $status, $message);
+      $status_options = array_flip($this->statusOptions);
+      $current_status = $status_options[$status];
+      if ($result) {
+        echo "T{$id}'s status is now set to {$current_status}.\n";
+      } else {
+        echo "T{$id} is already set to {$current_status}.\n";
+      }
+    }
+    return 0;
+  }
+
+  private function closeTask($task_id, $status = 1, $comment = "") {
+    $conduit = $this->getConduit();
+    $info = $conduit->callMethodSynchronous(
+      'maniphest.info',
+      array(
+        'task_id' => $task_id
+      ));
+    if ($info['status'] == $status) {
+      return false;
+    }
+    return $conduit->callMethodSynchronous(
+      'maniphest.update',
+      array(
+        'id' => $task_id,
+        'status' => $status,
+        'comments' => $comment
+      ));
+  }
+
+}
diff --git a/src/workflow/close/__init__.php b/src/workflow/close/__init__.php
new file mode 100644
index 00000000..54b89097
--- /dev/null
+++ b/src/workflow/close/__init__.php
@@ -0,0 +1,15 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('arcanist', 'workflow/base');
+
+phutil_require_module('phutil', 'console');
+phutil_require_module('phutil', 'utils');
+
+
+phutil_require_source('ArcanistCloseWorkflow.php');