diff --git a/src/branch/BranchInfo.php b/src/branch/BranchInfo.php
index 38881c3c..39d14d64 100644
--- a/src/branch/BranchInfo.php
+++ b/src/branch/BranchInfo.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -20,7 +20,7 @@
  * Holds information about a single git branch, and provides methods
  * for loading and display.
  */
-class BranchInfo {
+final class BranchInfo {
 
   private $branchName;
   private $currentHead = false;
diff --git a/src/configuration/ArcanistConfiguration.php b/src/configuration/ArcanistConfiguration.php
index a382ef7a..1a6eadda 100644
--- a/src/configuration/ArcanistConfiguration.php
+++ b/src/configuration/ArcanistConfiguration.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -37,6 +37,7 @@
  *      getCustomArgumentsForCommand().
  *
  * @group config
+ * @concrete-extensible
  */
 class ArcanistConfiguration {
 
diff --git a/src/difference/__tests__/ArcanistDiffUtilsTestCase.php b/src/difference/__tests__/ArcanistDiffUtilsTestCase.php
index 0f4e3764..f34eb7cb 100644
--- a/src/difference/__tests__/ArcanistDiffUtilsTestCase.php
+++ b/src/difference/__tests__/ArcanistDiffUtilsTestCase.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group testcase
  */
-class ArcanistDiffUtilsTestCase extends ArcanistPhutilTestCase {
+final class ArcanistDiffUtilsTestCase extends ArcanistPhutilTestCase {
   public function testLevenshtein() {
     $tests = array(
       array(
diff --git a/src/differential/commitmessage/ArcanistDifferentialCommitMessage.php b/src/differential/commitmessage/ArcanistDifferentialCommitMessage.php
index f807221c..1be8f675 100644
--- a/src/differential/commitmessage/ArcanistDifferentialCommitMessage.php
+++ b/src/differential/commitmessage/ArcanistDifferentialCommitMessage.php
@@ -21,7 +21,7 @@
  *
  * @group differential
  */
-class ArcanistDifferentialCommitMessage {
+final class ArcanistDifferentialCommitMessage {
 
   private $rawCorpus;
   private $revisionID;
diff --git a/src/differential/commitmessage/ArcanistDifferentialCommitMessageParserException.php b/src/differential/commitmessage/ArcanistDifferentialCommitMessageParserException.php
index e4faf5aa..dea1b0eb 100644
--- a/src/differential/commitmessage/ArcanistDifferentialCommitMessageParserException.php
+++ b/src/differential/commitmessage/ArcanistDifferentialCommitMessageParserException.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group differential
  */
-class ArcanistDifferentialCommitMessageParserException extends Exception {
+final class ArcanistDifferentialCommitMessageParserException extends Exception {
 
   private $parserErrors;
 
diff --git a/src/differential/revision/ArcanistDifferentialRevisionRef.php b/src/differential/revision/ArcanistDifferentialRevisionRef.php
index 5a7668b4..03796c68 100644
--- a/src/differential/revision/ArcanistDifferentialRevisionRef.php
+++ b/src/differential/revision/ArcanistDifferentialRevisionRef.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group differential
  */
-class ArcanistDifferentialRevisionRef {
+final class ArcanistDifferentialRevisionRef {
 
   protected $id;
   protected $name;
diff --git a/src/exception/ArcanistChooseInvalidRevisionException.php b/src/exception/ArcanistChooseInvalidRevisionException.php
index f49558d3..459f0cc2 100644
--- a/src/exception/ArcanistChooseInvalidRevisionException.php
+++ b/src/exception/ArcanistChooseInvalidRevisionException.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,6 +21,6 @@
  *
  * @group workflow
  */
-class ArcanistChooseInvalidRevisionException extends Exception {
+final class ArcanistChooseInvalidRevisionException extends Exception {
 
 }
diff --git a/src/exception/ArcanistChooseNoRevisionsException.php b/src/exception/ArcanistChooseNoRevisionsException.php
index cc8d1a73..e0e7d2bf 100644
--- a/src/exception/ArcanistChooseNoRevisionsException.php
+++ b/src/exception/ArcanistChooseNoRevisionsException.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -22,6 +22,6 @@
  *
  * @group workflow
  */
-class ArcanistChooseNoRevisionsException extends Exception {
+final class ArcanistChooseNoRevisionsException extends Exception {
 
 }
diff --git a/src/exception/usage/ArcanistUsageException.php b/src/exception/usage/ArcanistUsageException.php
index 1948c69b..6ec385eb 100644
--- a/src/exception/usage/ArcanistUsageException.php
+++ b/src/exception/usage/ArcanistUsageException.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,6 +21,7 @@
  * than a technical problem.
  *
  * @group workflow
+ * @concrete-extensible
  */
 class ArcanistUsageException extends Exception {
 
diff --git a/src/exception/usage/noeffect/ArcanistNoEffectException.php b/src/exception/usage/noeffect/ArcanistNoEffectException.php
index fed8371e..4cca1ab0 100644
--- a/src/exception/usage/noeffect/ArcanistNoEffectException.php
+++ b/src/exception/usage/noeffect/ArcanistNoEffectException.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -22,5 +22,5 @@
  *
  * @group workflow
  */
-class ArcanistNoEffectException extends ArcanistUsageException {
+final class ArcanistNoEffectException extends ArcanistUsageException {
 }
diff --git a/src/exception/usage/noengine/ArcanistNoEngineException.php b/src/exception/usage/noengine/ArcanistNoEngineException.php
index 5a118af9..ba76e449 100644
--- a/src/exception/usage/noengine/ArcanistNoEngineException.php
+++ b/src/exception/usage/noengine/ArcanistNoEngineException.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,5 +21,5 @@
  *
  * @group workflow
  */
-class ArcanistNoEngineException extends ArcanistUsageException {
+final class ArcanistNoEngineException extends ArcanistUsageException {
 }
diff --git a/src/exception/usage/userabort/ArcanistUserAbortException.php b/src/exception/usage/userabort/ArcanistUserAbortException.php
index 43b6c05f..c6ed1d5c 100644
--- a/src/exception/usage/userabort/ArcanistUserAbortException.php
+++ b/src/exception/usage/userabort/ArcanistUserAbortException.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -22,7 +22,7 @@
  *
  * @group workflow
  */
-class ArcanistUserAbortException extends ArcanistUsageException {
+final class ArcanistUserAbortException extends ArcanistUsageException {
   public function __construct() {
     parent::__construct('User aborted the workflow.');
   }
diff --git a/src/lint/engine/base/ArcanistLintEngine.php b/src/lint/engine/base/ArcanistLintEngine.php
index 72d441f6..45edff28 100644
--- a/src/lint/engine/base/ArcanistLintEngine.php
+++ b/src/lint/engine/base/ArcanistLintEngine.php
@@ -56,6 +56,7 @@
  * and Workflows} for more information about configuring lint engines.
  *
  * @group lint
+ * @stable
  */
 abstract class ArcanistLintEngine {
 
diff --git a/src/lint/engine/comprehensive/ComprehensiveLintEngine.php b/src/lint/engine/comprehensive/ComprehensiveLintEngine.php
index 2aea781a..6e0c0d26 100644
--- a/src/lint/engine/comprehensive/ComprehensiveLintEngine.php
+++ b/src/lint/engine/comprehensive/ComprehensiveLintEngine.php
@@ -21,7 +21,7 @@
  *
  * @group linter
  */
-class ComprehensiveLintEngine extends ArcanistLintEngine {
+final class ComprehensiveLintEngine extends ArcanistLintEngine {
 
   public function buildLinters() {
     $linters = array();
diff --git a/src/lint/engine/example/ExampleLintEngine.php b/src/lint/engine/example/ExampleLintEngine.php
index d99e7e81..b6106d79 100644
--- a/src/lint/engine/example/ExampleLintEngine.php
+++ b/src/lint/engine/example/ExampleLintEngine.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -23,7 +23,7 @@
  *
  * @group linter
  */
-class ExampleLintEngine extends ArcanistLintEngine {
+final class ExampleLintEngine extends ArcanistLintEngine {
 
   public function buildLinters() {
 
diff --git a/src/lint/engine/liberate/ArcanistLiberateLintEngine.php b/src/lint/engine/liberate/ArcanistLiberateLintEngine.php
index 111ad43a..3b1d9e47 100644
--- a/src/lint/engine/liberate/ArcanistLiberateLintEngine.php
+++ b/src/lint/engine/liberate/ArcanistLiberateLintEngine.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group linter
  */
-class ArcanistLiberateLintEngine extends ArcanistLintEngine {
+final class ArcanistLiberateLintEngine extends ArcanistLintEngine {
 
   public function buildLinters() {
     // We just run the module linter, 'arc liberate' is only interested in
diff --git a/src/lint/engine/phutil/PhutilLintEngine.php b/src/lint/engine/phutil/PhutilLintEngine.php
index ac4ecdd8..42d81184 100644
--- a/src/lint/engine/phutil/PhutilLintEngine.php
+++ b/src/lint/engine/phutil/PhutilLintEngine.php
@@ -19,6 +19,8 @@
 /**
  * Lint engine which enforces libphutil rules.
  *
+ * TODO: Deal with PhabricatorLintEngine extending this and then finalize it.
+ *
  * @group linter
  */
 class PhutilLintEngine extends ArcanistLintEngine {
diff --git a/src/lint/linter/apachelicense/ArcanistApacheLicenseLinter.php b/src/lint/linter/apachelicense/ArcanistApacheLicenseLinter.php
index f150572a..ff0336da 100644
--- a/src/lint/linter/apachelicense/ArcanistApacheLicenseLinter.php
+++ b/src/lint/linter/apachelicense/ArcanistApacheLicenseLinter.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group linter
  */
-class ArcanistApacheLicenseLinter extends ArcanistLicenseLinter {
+final class ArcanistApacheLicenseLinter extends ArcanistLicenseLinter {
   public function getLinterName() {
     return 'APACHELICENSE';
   }
diff --git a/src/lint/linter/apachelicense/__tests__/ArcanistApacheLicenseLinterTestCase.php b/src/lint/linter/apachelicense/__tests__/ArcanistApacheLicenseLinterTestCase.php
index def0666d..5c5f6939 100644
--- a/src/lint/linter/apachelicense/__tests__/ArcanistApacheLicenseLinterTestCase.php
+++ b/src/lint/linter/apachelicense/__tests__/ArcanistApacheLicenseLinterTestCase.php
@@ -21,7 +21,7 @@
  *
  * @group testcase
  */
-class ArcanistApacheLicenseLinterTestCase extends ArcanistLinterTestCase {
+final class ArcanistApacheLicenseLinterTestCase extends ArcanistLinterTestCase {
 
   public function testApacheLicenseLint() {
     $linter = new ArcanistApacheLicenseLinter();
diff --git a/src/lint/linter/base/ArcanistLinter.php b/src/lint/linter/base/ArcanistLinter.php
index de9db19b..366c0a69 100644
--- a/src/lint/linter/base/ArcanistLinter.php
+++ b/src/lint/linter/base/ArcanistLinter.php
@@ -20,6 +20,7 @@
  * Implements lint rules, like syntax checks for a specific language.
  *
  * @group linter
+ * @stable
  */
 abstract class ArcanistLinter {
 
diff --git a/src/lint/linter/conduit/ArcanistConduitLinter.php b/src/lint/linter/conduit/ArcanistConduitLinter.php
index 97d1eaf2..68c03132 100644
--- a/src/lint/linter/conduit/ArcanistConduitLinter.php
+++ b/src/lint/linter/conduit/ArcanistConduitLinter.php
@@ -49,7 +49,7 @@
  * This class is intended for customization via instantiation, not via
  * subclassing.
  */
-class ArcanistConduitLinter extends ArcanistLinter {
+final class ArcanistConduitLinter extends ArcanistLinter {
   const CONDUIT_METHOD = 'lint.getalllint';
 
   private $conduitURI;
diff --git a/src/lint/linter/filename/ArcanistFilenameLinter.php b/src/lint/linter/filename/ArcanistFilenameLinter.php
index f5630c03..a529bd74 100644
--- a/src/lint/linter/filename/ArcanistFilenameLinter.php
+++ b/src/lint/linter/filename/ArcanistFilenameLinter.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group linter
  */
-class ArcanistFilenameLinter extends ArcanistLinter {
+final class ArcanistFilenameLinter extends ArcanistLinter {
 
   const LINT_BAD_FILENAME = 1;
 
diff --git a/src/lint/linter/generated/ArcanistGeneratedLinter.php b/src/lint/linter/generated/ArcanistGeneratedLinter.php
index 91e30eff..84ee58be 100644
--- a/src/lint/linter/generated/ArcanistGeneratedLinter.php
+++ b/src/lint/linter/generated/ArcanistGeneratedLinter.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group linter
  */
-class ArcanistGeneratedLinter extends ArcanistLinter {
+final class ArcanistGeneratedLinter extends ArcanistLinter {
 
   public function willLintPaths(array $paths) {
     return;
diff --git a/src/lint/linter/jshint/ArcanistJSHintLinter.php b/src/lint/linter/jshint/ArcanistJSHintLinter.php
index db4c53a2..6d25a4dd 100644
--- a/src/lint/linter/jshint/ArcanistJSHintLinter.php
+++ b/src/lint/linter/jshint/ArcanistJSHintLinter.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -52,7 +52,7 @@
  *
  * @group linter
  */
-class ArcanistJSHintLinter extends ArcanistLinter {
+final class ArcanistJSHintLinter extends ArcanistLinter {
 
   const JSHINT_ERROR = 1;
 
diff --git a/src/lint/linter/nolint/ArcanistNoLintLinter.php b/src/lint/linter/nolint/ArcanistNoLintLinter.php
index 705446ee..a6c4b6e4 100644
--- a/src/lint/linter/nolint/ArcanistNoLintLinter.php
+++ b/src/lint/linter/nolint/ArcanistNoLintLinter.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -22,7 +22,7 @@
  *
  * @group linter
  */
-class ArcanistNoLintLinter extends ArcanistLinter {
+final class ArcanistNoLintLinter extends ArcanistLinter {
   public function willLintPaths(array $paths) {
     return;
   }
diff --git a/src/lint/linter/pep8/ArcanistPEP8Linter.php b/src/lint/linter/pep8/ArcanistPEP8Linter.php
index d05bc9b6..9e5aa6b2 100644
--- a/src/lint/linter/pep8/ArcanistPEP8Linter.php
+++ b/src/lint/linter/pep8/ArcanistPEP8Linter.php
@@ -21,7 +21,7 @@
  *
  * @group linter
  */
-class ArcanistPEP8Linter extends ArcanistLinter {
+final class ArcanistPEP8Linter extends ArcanistLinter {
 
   public function willLintPaths(array $paths) {
     return;
diff --git a/src/lint/linter/phutilmodule/ArcanistPhutilModuleLinter.php b/src/lint/linter/phutilmodule/ArcanistPhutilModuleLinter.php
index b8d56980..71e3f785 100644
--- a/src/lint/linter/phutilmodule/ArcanistPhutilModuleLinter.php
+++ b/src/lint/linter/phutilmodule/ArcanistPhutilModuleLinter.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group linter
  */
-class ArcanistPhutilModuleLinter extends ArcanistLinter {
+final class ArcanistPhutilModuleLinter extends ArcanistLinter {
 
   const LINT_UNDECLARED_CLASS       = 1;
   const LINT_UNDECLARED_FUNCTION    = 2;
diff --git a/src/lint/linter/pyflakes/ArcanistPyFlakesLinter.php b/src/lint/linter/pyflakes/ArcanistPyFlakesLinter.php
index 3b2dfbaa..921db13d 100644
--- a/src/lint/linter/pyflakes/ArcanistPyFlakesLinter.php
+++ b/src/lint/linter/pyflakes/ArcanistPyFlakesLinter.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group linter
  */
-class ArcanistPyFlakesLinter extends ArcanistLinter {
+final class ArcanistPyFlakesLinter extends ArcanistLinter {
 
   public function willLintPaths(array $paths) {
     return;
diff --git a/src/lint/linter/pylint/ArcanistPyLintLinter.php b/src/lint/linter/pylint/ArcanistPyLintLinter.php
index 51c48fdd..0a01c64e 100644
--- a/src/lint/linter/pylint/ArcanistPyLintLinter.php
+++ b/src/lint/linter/pylint/ArcanistPyLintLinter.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -67,7 +67,7 @@
  *
  * @group linter
  */
-class ArcanistPyLintLinter extends ArcanistLinter {
+final class ArcanistPyLintLinter extends ArcanistLinter {
 
   private function getMessageCodeSeverity($code) {
 
diff --git a/src/lint/linter/spelling/ArcanistSpellingLinter.php b/src/lint/linter/spelling/ArcanistSpellingLinter.php
index 4560f7ee..5abd8933 100644
--- a/src/lint/linter/spelling/ArcanistSpellingLinter.php
+++ b/src/lint/linter/spelling/ArcanistSpellingLinter.php
@@ -24,7 +24,7 @@
  *
  * @group linter
  */
-class ArcanistSpellingLinter extends ArcanistLinter {
+final class ArcanistSpellingLinter extends ArcanistLinter {
 
   const LINT_SPELLING_PICKY = 0;
   const LINT_SPELLING_IMPORTANT = 1;
diff --git a/src/lint/linter/spelling/__tests__/ArcanistSpellingLinterTestCase.php b/src/lint/linter/spelling/__tests__/ArcanistSpellingLinterTestCase.php
index cbaa17b9..cdead793 100644
--- a/src/lint/linter/spelling/__tests__/ArcanistSpellingLinterTestCase.php
+++ b/src/lint/linter/spelling/__tests__/ArcanistSpellingLinterTestCase.php
@@ -21,7 +21,7 @@
  *
  * @group testcase
  */
-class ArcanistSpellingLinterTestCase extends ArcanistLinterTestCase {
+final class ArcanistSpellingLinterTestCase extends ArcanistLinterTestCase {
 
   public function testSpellingLint() {
     $linter = new ArcanistSpellingLinter();
diff --git a/src/lint/linter/text/ArcanistTextLinter.php b/src/lint/linter/text/ArcanistTextLinter.php
index a3c1df30..8326af26 100644
--- a/src/lint/linter/text/ArcanistTextLinter.php
+++ b/src/lint/linter/text/ArcanistTextLinter.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group linter
  */
-class ArcanistTextLinter extends ArcanistLinter {
+final class ArcanistTextLinter extends ArcanistLinter {
 
   const LINT_DOS_NEWLINE            = 1;
   const LINT_TAB_LITERAL            = 2;
diff --git a/src/lint/linter/text/__tests__/ArcanistTextLinterTestCase.php b/src/lint/linter/text/__tests__/ArcanistTextLinterTestCase.php
index a271bcc0..021eff46 100644
--- a/src/lint/linter/text/__tests__/ArcanistTextLinterTestCase.php
+++ b/src/lint/linter/text/__tests__/ArcanistTextLinterTestCase.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group testcase
  */
-class ArcanistTextLinterTestCase extends ArcanistLinterTestCase {
+final class ArcanistTextLinterTestCase extends ArcanistLinterTestCase {
 
   public function testTextLint() {
     $linter = new ArcanistTextLinter();
diff --git a/src/lint/linter/xhpast/ArcanistXHPASTLinter.php b/src/lint/linter/xhpast/ArcanistXHPASTLinter.php
index 97598bfd..f78cd3ab 100644
--- a/src/lint/linter/xhpast/ArcanistXHPASTLinter.php
+++ b/src/lint/linter/xhpast/ArcanistXHPASTLinter.php
@@ -21,7 +21,7 @@
  *
  * @group linter
  */
-class ArcanistXHPASTLinter extends ArcanistLinter {
+final class ArcanistXHPASTLinter extends ArcanistLinter {
 
   protected $trees = array();
 
diff --git a/src/lint/linter/xhpast/__tests__/ArcanistXHPASTLinterTestCase.php b/src/lint/linter/xhpast/__tests__/ArcanistXHPASTLinterTestCase.php
index b18aafd4..6228aee3 100644
--- a/src/lint/linter/xhpast/__tests__/ArcanistXHPASTLinterTestCase.php
+++ b/src/lint/linter/xhpast/__tests__/ArcanistXHPASTLinterTestCase.php
@@ -21,7 +21,7 @@
  *
  * @group testcase
  */
-class ArcanistXHPASTLinterTestCase extends ArcanistLinterTestCase {
+final class ArcanistXHPASTLinterTestCase extends ArcanistLinterTestCase {
 
   public function testXHPASTLint() {
     $linter = new ArcanistXHPASTLinter();
diff --git a/src/lint/message/ArcanistLintMessage.php b/src/lint/message/ArcanistLintMessage.php
index dcfa2418..8fe9850e 100644
--- a/src/lint/message/ArcanistLintMessage.php
+++ b/src/lint/message/ArcanistLintMessage.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group lint
  */
-class ArcanistLintMessage {
+final class ArcanistLintMessage {
 
   protected $path;
   protected $line;
diff --git a/src/lint/renderer/ArcanistLintJSONRenderer.php b/src/lint/renderer/ArcanistLintJSONRenderer.php
index d5bed9a6..5cde7cce 100644
--- a/src/lint/renderer/ArcanistLintJSONRenderer.php
+++ b/src/lint/renderer/ArcanistLintJSONRenderer.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group lint
  */
-class ArcanistLintJSONRenderer {
+final class ArcanistLintJSONRenderer {
   const LINES_OF_CONTEXT = 3;
 
   public function renderLintResult(ArcanistLintResult $result) {
diff --git a/src/lint/renderer/ArcanistLintRenderer.php b/src/lint/renderer/ArcanistLintRenderer.php
index 235e1612..cdc416e2 100644
--- a/src/lint/renderer/ArcanistLintRenderer.php
+++ b/src/lint/renderer/ArcanistLintRenderer.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group lint
  */
-class ArcanistLintRenderer {
+final class ArcanistLintRenderer {
   public function renderLintResult(ArcanistLintResult $result) {
     $messages = $result->getMessages();
     $path = $result->getPath();
diff --git a/src/lint/renderer/ArcanistLintSummaryRenderer.php b/src/lint/renderer/ArcanistLintSummaryRenderer.php
index b5b22477..a9d05375 100644
--- a/src/lint/renderer/ArcanistLintSummaryRenderer.php
+++ b/src/lint/renderer/ArcanistLintSummaryRenderer.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group lint
  */
-class ArcanistLintSummaryRenderer {
+final class ArcanistLintSummaryRenderer {
   public function renderLintResult(ArcanistLintResult $result) {
     $messages = $result->getMessages();
     $path = $result->getPath();
diff --git a/src/lint/severity/ArcanistLintSeverity.php b/src/lint/severity/ArcanistLintSeverity.php
index 62b11591..f4d3191b 100644
--- a/src/lint/severity/ArcanistLintSeverity.php
+++ b/src/lint/severity/ArcanistLintSeverity.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group lint
  */
-class ArcanistLintSeverity {
+final class ArcanistLintSeverity {
 
   const SEVERITY_ADVICE       = 'advice';
   const SEVERITY_WARNING      = 'warning';
diff --git a/src/parser/bundle/ArcanistBundle.php b/src/parser/bundle/ArcanistBundle.php
index 5acc8603..f7be40d2 100644
--- a/src/parser/bundle/ArcanistBundle.php
+++ b/src/parser/bundle/ArcanistBundle.php
@@ -21,7 +21,7 @@
  *
  * @group diff
  */
-class ArcanistBundle {
+final class ArcanistBundle {
 
   private $changes;
   private $conduit;
diff --git a/src/parser/diff/ArcanistDiffParser.php b/src/parser/diff/ArcanistDiffParser.php
index 1a7d478d..c279e7c8 100644
--- a/src/parser/diff/ArcanistDiffParser.php
+++ b/src/parser/diff/ArcanistDiffParser.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group diff
  */
-class ArcanistDiffParser {
+final class ArcanistDiffParser {
 
   protected $api;
   protected $text;
diff --git a/src/parser/diff/__tests__/ArcanistDiffParserTestCase.php b/src/parser/diff/__tests__/ArcanistDiffParserTestCase.php
index 3bac9f98..5164db79 100644
--- a/src/parser/diff/__tests__/ArcanistDiffParserTestCase.php
+++ b/src/parser/diff/__tests__/ArcanistDiffParserTestCase.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group testcase
  */
-class ArcanistDiffParserTestCase extends ArcanistPhutilTestCase {
+final class ArcanistDiffParserTestCase extends ArcanistPhutilTestCase {
 
   public function testParser() {
     $root = dirname(__FILE__).'/data/';
diff --git a/src/parser/diff/change/ArcanistDiffChange.php b/src/parser/diff/change/ArcanistDiffChange.php
index 3b093501..16ab7c3d 100644
--- a/src/parser/diff/change/ArcanistDiffChange.php
+++ b/src/parser/diff/change/ArcanistDiffChange.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group diff
  */
-class ArcanistDiffChange {
+final class ArcanistDiffChange {
 
   protected $metadata = array();
 
diff --git a/src/parser/diff/changetype/ArcanistDiffChangeType.php b/src/parser/diff/changetype/ArcanistDiffChangeType.php
index be68a5b6..fb3ea464 100644
--- a/src/parser/diff/changetype/ArcanistDiffChangeType.php
+++ b/src/parser/diff/changetype/ArcanistDiffChangeType.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group diff
  */
-class ArcanistDiffChangeType {
+final class ArcanistDiffChangeType {
   const TYPE_ADD        = 1;
   const TYPE_CHANGE     = 2;
   const TYPE_DELETE     = 3;
diff --git a/src/parser/diff/hunk/ArcanistDiffHunk.php b/src/parser/diff/hunk/ArcanistDiffHunk.php
index e634f621..150815de 100644
--- a/src/parser/diff/hunk/ArcanistDiffHunk.php
+++ b/src/parser/diff/hunk/ArcanistDiffHunk.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group diff
  */
-class ArcanistDiffHunk {
+final class ArcanistDiffHunk {
 
   protected $oldOffset;
   protected $oldLength;
diff --git a/src/parser/phutilmodule/PhutilModuleRequirements.php b/src/parser/phutilmodule/PhutilModuleRequirements.php
index 894932b6..4b50e4b9 100644
--- a/src/parser/phutilmodule/PhutilModuleRequirements.php
+++ b/src/parser/phutilmodule/PhutilModuleRequirements.php
@@ -21,7 +21,7 @@
  *
  * @group module
  */
-class PhutilModuleRequirements {
+final class PhutilModuleRequirements {
 
   protected $builtins = array(
     'class'       => array(),
diff --git a/src/repository/api/git/ArcanistGitAPI.php b/src/repository/api/git/ArcanistGitAPI.php
index c25f3d66..890f17ab 100644
--- a/src/repository/api/git/ArcanistGitAPI.php
+++ b/src/repository/api/git/ArcanistGitAPI.php
@@ -21,7 +21,7 @@
  *
  * @group workingcopy
  */
-class ArcanistGitAPI extends ArcanistRepositoryAPI {
+final class ArcanistGitAPI extends ArcanistRepositoryAPI {
 
   private $status;
   private $relativeCommit = null;
diff --git a/src/repository/api/mercurial/ArcanistMercurialAPI.php b/src/repository/api/mercurial/ArcanistMercurialAPI.php
index 9aa736b9..f7c54ffb 100644
--- a/src/repository/api/mercurial/ArcanistMercurialAPI.php
+++ b/src/repository/api/mercurial/ArcanistMercurialAPI.php
@@ -21,7 +21,7 @@
  *
  * @group workingcopy
  */
-class ArcanistMercurialAPI extends ArcanistRepositoryAPI {
+final class ArcanistMercurialAPI extends ArcanistRepositoryAPI {
 
   private $status;
   private $base;
diff --git a/src/repository/api/subversion/ArcanistSubversionAPI.php b/src/repository/api/subversion/ArcanistSubversionAPI.php
index 2070734e..d580da09 100644
--- a/src/repository/api/subversion/ArcanistSubversionAPI.php
+++ b/src/repository/api/subversion/ArcanistSubversionAPI.php
@@ -21,7 +21,7 @@
  *
  * @group workingcopy
  */
-class ArcanistSubversionAPI extends ArcanistRepositoryAPI {
+final class ArcanistSubversionAPI extends ArcanistRepositoryAPI {
 
   protected $svnStatus;
   protected $svnBaseRevisions;
diff --git a/src/repository/hookapi/subversion/ArcanistSubversionHookAPI.php b/src/repository/hookapi/subversion/ArcanistSubversionHookAPI.php
index 0982f033..2381df43 100644
--- a/src/repository/hookapi/subversion/ArcanistSubversionHookAPI.php
+++ b/src/repository/hookapi/subversion/ArcanistSubversionHookAPI.php
@@ -19,7 +19,7 @@
 /**
  * Interfaces with Subversion while running as a commit hook.
  */
-class ArcanistSubversionHookAPI extends ArcanistHookAPI {
+final class ArcanistSubversionHookAPI extends ArcanistHookAPI {
 
   protected $root;
   protected $transaction;
diff --git a/src/unit/engine/phutil/PhutilUnitTestEngine.php b/src/unit/engine/phutil/PhutilUnitTestEngine.php
index f4686228..7f8f5199 100644
--- a/src/unit/engine/phutil/PhutilUnitTestEngine.php
+++ b/src/unit/engine/phutil/PhutilUnitTestEngine.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group unitrun
  */
-class PhutilUnitTestEngine extends ArcanistBaseUnitTestEngine {
+final class PhutilUnitTestEngine extends ArcanistBaseUnitTestEngine {
 
   public function run() {
 
diff --git a/src/unit/engine/phutil/__tests__/PhutilUnitTestEngineTestCase.php b/src/unit/engine/phutil/__tests__/PhutilUnitTestEngineTestCase.php
index 9b55c847..b8d45bc2 100644
--- a/src/unit/engine/phutil/__tests__/PhutilUnitTestEngineTestCase.php
+++ b/src/unit/engine/phutil/__tests__/PhutilUnitTestEngineTestCase.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group testcase
  */
-class PhutilUnitTestEngineTestCase extends ArcanistPhutilTestCase {
+final class PhutilUnitTestEngineTestCase extends ArcanistPhutilTestCase {
 
   static $allTestsCounter = 0;
   static $oneTestCounter = 0;
diff --git a/src/unit/engine/phutil/testcase/exception/ArcanistPhutilTestTerminatedException.php b/src/unit/engine/phutil/testcase/exception/ArcanistPhutilTestTerminatedException.php
index 1c80ea4c..5d0c76e7 100644
--- a/src/unit/engine/phutil/testcase/exception/ArcanistPhutilTestTerminatedException.php
+++ b/src/unit/engine/phutil/testcase/exception/ArcanistPhutilTestTerminatedException.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,4 +21,4 @@
  *
  * @group unitrun
  */
-class ArcanistPhutilTestTerminatedException extends Exception {}
+final class ArcanistPhutilTestTerminatedException extends Exception {}
diff --git a/src/unit/result/ArcanistUnitTestResult.php b/src/unit/result/ArcanistUnitTestResult.php
index e2d63366..688dc894 100644
--- a/src/unit/result/ArcanistUnitTestResult.php
+++ b/src/unit/result/ArcanistUnitTestResult.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group unit
  */
-class ArcanistUnitTestResult {
+final class ArcanistUnitTestResult {
 
   const RESULT_PASS         = 'pass';
   const RESULT_FAIL         = 'fail';
diff --git a/src/workflow/amend/ArcanistAmendWorkflow.php b/src/workflow/amend/ArcanistAmendWorkflow.php
index e2cb9844..fa0bc7c7 100644
--- a/src/workflow/amend/ArcanistAmendWorkflow.php
+++ b/src/workflow/amend/ArcanistAmendWorkflow.php
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistAmendWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistAmendWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/base/ArcanistBaseWorkflow.php b/src/workflow/base/ArcanistBaseWorkflow.php
index 7a459861..c5182058 100644
--- a/src/workflow/base/ArcanistBaseWorkflow.php
+++ b/src/workflow/base/ArcanistBaseWorkflow.php
@@ -39,8 +39,9 @@
  *
  * @task  conduit   Conduit
  * @group workflow
+ * @stable
  */
-class ArcanistBaseWorkflow {
+abstract class ArcanistBaseWorkflow {
 
   private $conduit;
   private $conduitURI;
diff --git a/src/workflow/branch/ArcanistBranchWorkflow.php b/src/workflow/branch/ArcanistBranchWorkflow.php
index fa6767f8..cc56998e 100644
--- a/src/workflow/branch/ArcanistBranchWorkflow.php
+++ b/src/workflow/branch/ArcanistBranchWorkflow.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistBranchWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistBranchWorkflow extends ArcanistBaseWorkflow {
 
   private $branches;
 
diff --git a/src/workflow/call-conduit/ArcanistCallConduitWorkflow.php b/src/workflow/call-conduit/ArcanistCallConduitWorkflow.php
index 7a225dd3..713e4840 100644
--- a/src/workflow/call-conduit/ArcanistCallConduitWorkflow.php
+++ b/src/workflow/call-conduit/ArcanistCallConduitWorkflow.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistCallConduitWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistCallConduitWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/commit/ArcanistCommitWorkflow.php b/src/workflow/commit/ArcanistCommitWorkflow.php
index f6839881..dca10af6 100644
--- a/src/workflow/commit/ArcanistCommitWorkflow.php
+++ b/src/workflow/commit/ArcanistCommitWorkflow.php
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistCommitWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistCommitWorkflow extends ArcanistBaseWorkflow {
 
   private $revisionID;
 
diff --git a/src/workflow/cover/ArcanistCoverWorkflow.php b/src/workflow/cover/ArcanistCoverWorkflow.php
index 44d5792f..6413a8be 100644
--- a/src/workflow/cover/ArcanistCoverWorkflow.php
+++ b/src/workflow/cover/ArcanistCoverWorkflow.php
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistCoverWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistCoverWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/diff/ArcanistDiffWorkflow.php b/src/workflow/diff/ArcanistDiffWorkflow.php
index 0643fcce..49d28bcf 100644
--- a/src/workflow/diff/ArcanistDiffWorkflow.php
+++ b/src/workflow/diff/ArcanistDiffWorkflow.php
@@ -26,7 +26,7 @@
  *
  * @group workflow
  */
-class ArcanistDiffWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistDiffWorkflow extends ArcanistBaseWorkflow {
 
   private $hasWarnedExternals = false;
   private $unresolvedLint;
diff --git a/src/workflow/git-hook-pre-receive/ArcanistGitHookPreReceiveWorkflow.php b/src/workflow/git-hook-pre-receive/ArcanistGitHookPreReceiveWorkflow.php
index 1f36277e..27d13519 100644
--- a/src/workflow/git-hook-pre-receive/ArcanistGitHookPreReceiveWorkflow.php
+++ b/src/workflow/git-hook-pre-receive/ArcanistGitHookPreReceiveWorkflow.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistGitHookPreReceiveWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistGitHookPreReceiveWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/help/ArcanistHelpWorkflow.php b/src/workflow/help/ArcanistHelpWorkflow.php
index d4421e82..8a72513e 100644
--- a/src/workflow/help/ArcanistHelpWorkflow.php
+++ b/src/workflow/help/ArcanistHelpWorkflow.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistHelpWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistHelpWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/install-certificate/ArcanistInstallCertificateWorkflow.php b/src/workflow/install-certificate/ArcanistInstallCertificateWorkflow.php
index eea0cffa..36aadc93 100644
--- a/src/workflow/install-certificate/ArcanistInstallCertificateWorkflow.php
+++ b/src/workflow/install-certificate/ArcanistInstallCertificateWorkflow.php
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistInstallCertificateWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistInstallCertificateWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/land/ArcanistLandWorkflow.php b/src/workflow/land/ArcanistLandWorkflow.php
index f6fd53cc..742896d1 100644
--- a/src/workflow/land/ArcanistLandWorkflow.php
+++ b/src/workflow/land/ArcanistLandWorkflow.php
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistLandWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistLandWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/liberate/ArcanistLiberateWorkflow.php b/src/workflow/liberate/ArcanistLiberateWorkflow.php
index 68289392..f779d348 100644
--- a/src/workflow/liberate/ArcanistLiberateWorkflow.php
+++ b/src/workflow/liberate/ArcanistLiberateWorkflow.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -27,7 +27,7 @@
  *
  * @group workflow
  */
-class ArcanistLiberateWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistLiberateWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/list/ArcanistListWorkflow.php b/src/workflow/list/ArcanistListWorkflow.php
index 0ab5fd65..f020ebf1 100644
--- a/src/workflow/list/ArcanistListWorkflow.php
+++ b/src/workflow/list/ArcanistListWorkflow.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistListWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistListWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/mark-committed/ArcanistMarkCommittedWorkflow.php b/src/workflow/mark-committed/ArcanistMarkCommittedWorkflow.php
index a83b5f25..6d4a326d 100644
--- a/src/workflow/mark-committed/ArcanistMarkCommittedWorkflow.php
+++ b/src/workflow/mark-committed/ArcanistMarkCommittedWorkflow.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistMarkCommittedWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistMarkCommittedWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/merge/ArcanistMergeWorkflow.php b/src/workflow/merge/ArcanistMergeWorkflow.php
index 881e1fb9..0271c127 100644
--- a/src/workflow/merge/ArcanistMergeWorkflow.php
+++ b/src/workflow/merge/ArcanistMergeWorkflow.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -22,7 +22,7 @@
  *
  * @group workflow
  */
-class ArcanistMergeWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistMergeWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/shell-complete/ArcanistShellCompleteWorkflow.php b/src/workflow/shell-complete/ArcanistShellCompleteWorkflow.php
index 7cd8463e..c297ac0b 100644
--- a/src/workflow/shell-complete/ArcanistShellCompleteWorkflow.php
+++ b/src/workflow/shell-complete/ArcanistShellCompleteWorkflow.php
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistShellCompleteWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistShellCompleteWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/svn-hook-pre-commit/ArcanistSvnHookPreCommitWorkflow.php b/src/workflow/svn-hook-pre-commit/ArcanistSvnHookPreCommitWorkflow.php
index 4e2acd3d..a8fc9dde 100644
--- a/src/workflow/svn-hook-pre-commit/ArcanistSvnHookPreCommitWorkflow.php
+++ b/src/workflow/svn-hook-pre-commit/ArcanistSvnHookPreCommitWorkflow.php
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistSvnHookPreCommitWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistSvnHookPreCommitWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workflow/unit/ArcanistUnitWorkflow.php b/src/workflow/unit/ArcanistUnitWorkflow.php
index 9b9c21a2..4c4c1259 100644
--- a/src/workflow/unit/ArcanistUnitWorkflow.php
+++ b/src/workflow/unit/ArcanistUnitWorkflow.php
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistUnitWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistUnitWorkflow extends ArcanistBaseWorkflow {
 
   const RESULT_OKAY      = 0;
   const RESULT_UNSOUND   = 1;
diff --git a/src/workflow/which/ArcanistWhichWorkflow.php b/src/workflow/which/ArcanistWhichWorkflow.php
index 0c73bb7e..d344b0e1 100644
--- a/src/workflow/which/ArcanistWhichWorkflow.php
+++ b/src/workflow/which/ArcanistWhichWorkflow.php
@@ -21,7 +21,7 @@
  *
  * @group workflow
  */
-class ArcanistWhichWorkflow extends ArcanistBaseWorkflow {
+final class ArcanistWhichWorkflow extends ArcanistBaseWorkflow {
 
   public function getCommandHelp() {
     return phutil_console_format(<<<EOTEXT
diff --git a/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php b/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php
index 7763ac9a..0468074d 100644
--- a/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php
+++ b/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * 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.
@@ -21,7 +21,7 @@
  *
  * @group workingcopy
  */
-class ArcanistWorkingCopyIdentity {
+final class ArcanistWorkingCopyIdentity {
 
   protected $projectConfig;
   protected $projectRoot;