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
@@ -30,6 +30,7 @@
     'ArcanistAnoidWorkflow' => 'workflow/ArcanistAnoidWorkflow.php',
     'ArcanistArcConfigurationEngineExtension' => 'config/arc/ArcanistArcConfigurationEngineExtension.php',
     'ArcanistArcToolset' => 'toolset/ArcanistArcToolset.php',
+    'ArcanistArcWorkflow' => 'toolset/workflow/ArcanistArcWorkflow.php',
     'ArcanistArrayCombineXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistArrayCombineXHPASTLinterRule.php',
     'ArcanistArrayCombineXHPASTLinterRuleTestCase' => 'lint/linter/xhpast/rules/__tests__/ArcanistArrayCombineXHPASTLinterRuleTestCase.php',
     'ArcanistArrayIndexSpacingXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistArrayIndexSpacingXHPASTLinterRule.php',
@@ -213,7 +214,7 @@
     'ArcanistHLintLinter' => 'lint/linter/ArcanistHLintLinter.php',
     'ArcanistHLintLinterTestCase' => 'lint/linter/__tests__/ArcanistHLintLinterTestCase.php',
     'ArcanistHardpointLoader' => 'loader/ArcanistHardpointLoader.php',
-    'ArcanistHelpWorkflow' => 'workflow/ArcanistHelpWorkflow.php',
+    'ArcanistHelpWorkflow' => 'toolset/workflow/ArcanistHelpWorkflow.php',
     'ArcanistHexadecimalNumericScalarCasingXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistHexadecimalNumericScalarCasingXHPASTLinterRule.php',
     'ArcanistHexadecimalNumericScalarCasingXHPASTLinterRuleTestCase' => 'lint/linter/xhpast/rules/__tests__/ArcanistHexadecimalNumericScalarCasingXHPASTLinterRuleTestCase.php',
     'ArcanistHgClientChannel' => 'hgdaemon/ArcanistHgClientChannel.php',
@@ -968,6 +969,7 @@
     'ArcanistAnoidWorkflow' => 'ArcanistWorkflow',
     'ArcanistArcConfigurationEngineExtension' => 'ArcanistConfigurationEngineExtension',
     'ArcanistArcToolset' => 'ArcanistToolset',
+    'ArcanistArcWorkflow' => 'ArcanistWorkflow',
     'ArcanistArrayCombineXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
     'ArcanistArrayCombineXHPASTLinterRuleTestCase' => 'ArcanistXHPASTLinterRuleTestCase',
     'ArcanistArrayIndexSpacingXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
diff --git a/src/toolset/workflow/ArcanistArcWorkflow.php b/src/toolset/workflow/ArcanistArcWorkflow.php
new file mode 100644
--- /dev/null
+++ b/src/toolset/workflow/ArcanistArcWorkflow.php
@@ -0,0 +1,11 @@
+<?php
+
+abstract class ArcanistArcWorkflow
+  extends ArcanistWorkflow {
+
+  public function supportsToolset(ArcanistToolset $toolset) {
+    $key = $toolset->getToolsetKey();
+    return ($key === 'arc');
+  }
+
+}
diff --git a/src/toolset/workflow/ArcanistHelpWorkflow.php b/src/toolset/workflow/ArcanistHelpWorkflow.php
new file mode 100644
--- /dev/null
+++ b/src/toolset/workflow/ArcanistHelpWorkflow.php
@@ -0,0 +1,18 @@
+<?php
+
+final class ArcanistHelpWorkflow
+  extends ArcanistWorkflow {
+
+  public function getWorkflowName() {
+    return 'help';
+  }
+
+  public function newPhutilWorkflow() {
+    return new PhutilHelpArgumentWorkflow();
+  }
+
+  public function supportsToolset(ArcanistToolset $toolset) {
+    return true;
+  }
+
+}
diff --git a/src/workflow/ArcanistHelpWorkflow.php b/src/workflow/ArcanistHelpWorkflow.php
deleted file mode 100644
--- a/src/workflow/ArcanistHelpWorkflow.php
+++ /dev/null
@@ -1,221 +0,0 @@
-<?php
-
-/**
- * Seduces the reader with majestic prose.
- */
-final class ArcanistHelpWorkflow extends ArcanistWorkflow {
-
-  public function getWorkflowName() {
-    return 'help';
-  }
-
-  public function getCommandSynopses() {
-    return phutil_console_format(<<<EOTEXT
-      **help** [__command__]
-      **help** --full
-EOTEXT
-      );
-  }
-
-  public function getCommandHelp() {
-    return phutil_console_format(<<<EOTEXT
-          Supports: english
-          Shows this help. With __command__, shows help about a specific
-          command.
-EOTEXT
-      );
-  }
-
-  public function getArguments() {
-    return array(
-      'full' => array(
-        'help' => pht('Print detailed information about each command.'),
-      ),
-      '*' => 'command',
-    );
-  }
-
-  public function run() {
-
-    $arc_config = $this->getArcanistConfiguration();
-    $workflows = $arc_config->buildAllWorkflows();
-    ksort($workflows);
-
-    $target = null;
-    if ($this->getArgument('command')) {
-      $target = head($this->getArgument('command'));
-      if (empty($workflows[$target])) {
-        throw new ArcanistUsageException(
-          pht(
-            "Unrecognized command '%s'. Try '%s'.",
-            $target,
-            'arc help'));
-      }
-    }
-
-    $cmdref = array();
-    foreach ($workflows as $command => $workflow) {
-      if ($target && $target != $command) {
-        continue;
-      }
-      if (!$target && !$this->getArgument('full')) {
-        $cmdref[] = $workflow->getCommandSynopses();
-        continue;
-      }
-      $optref = array();
-      $arguments = $workflow->getArguments();
-
-      $config_arguments = $arc_config->getCustomArgumentsForCommand($command);
-
-      // This juggling is to put the extension arguments after the normal
-      // arguments, and make sure the normal arguments aren't overwritten.
-      ksort($arguments);
-      ksort($config_arguments);
-      foreach ($config_arguments as $argument => $spec) {
-        if (empty($arguments[$argument])) {
-          $arguments[$argument] = $spec;
-        }
-      }
-
-      foreach ($arguments as $argument => $spec) {
-        if ($argument == '*') {
-          continue;
-        }
-        if (!empty($spec['hide'])) {
-          continue;
-        }
-        if (isset($spec['param'])) {
-          if (isset($spec['short'])) {
-            $optref[] = phutil_console_format(
-              '          __--%s__ __%s__, __-%s__ __%s__',
-              $argument,
-              $spec['param'],
-              $spec['short'],
-              $spec['param']);
-          } else {
-            $optref[] = phutil_console_format(
-              '          __--%s__ __%s__',
-              $argument,
-              $spec['param']);
-          }
-        } else {
-          if (isset($spec['short'])) {
-            $optref[] = phutil_console_format(
-              '          __--%s__, __-%s__',
-              $argument,
-              $spec['short']);
-          } else {
-            $optref[] = phutil_console_format(
-              '          __--%s__',
-              $argument);
-          }
-        }
-
-        if (isset($config_arguments[$argument])) {
-          $optref[] = '              '.
-            pht('(This is a custom option for this project.)');
-        }
-
-        if (isset($spec['supports'])) {
-          $optref[] = '              '.
-            pht('Supports: %s', implode(', ', $spec['supports']));
-        }
-
-        if (isset($spec['help'])) {
-          $docs = $spec['help'];
-        } else {
-          $docs = pht('This option is not documented.');
-        }
-        $docs = phutil_console_wrap($docs, 14);
-        $optref[] = "{$docs}\n";
-      }
-      if ($optref) {
-        $optref = implode("\n", $optref);
-        $optref = "\n\n".$optref;
-      } else {
-        $optref = "\n";
-      }
-
-      $cmdref[] =
-        $workflow->getCommandSynopses()."\n".
-        $workflow->getCommandHelp().
-        $optref;
-    }
-    $cmdref = implode("\n\n", $cmdref);
-
-    if ($target) {
-      echo "\n".$cmdref."\n";
-      return;
-    }
-
-    $self = 'arc';
-    echo phutil_console_format(<<<EOTEXT
-**NAME**
-      **{$self}** - arcanist, a code review and revision management utility
-
-**SYNOPSIS**
-      **{$self}** __command__ [__options__] [__args__]
-      This help file provides a detailed command reference.
-
-**COMMAND REFERENCE**
-
-{$cmdref}
-
-
-EOTEXT
-    );
-
-    if (!$this->getArgument('full')) {
-      echo pht(
-        "Run '%s' to get commands and options descriptions.\n",
-        'arc help --full');
-      return;
-    }
-
-    echo phutil_console_format(<<<EOTEXT
-**OPTION REFERENCE**
-
-      __--trace__
-          Debugging command. Shows underlying commands as they are executed,
-          and full stack traces when exceptions are thrown.
-
-      __--no-ansi__
-          Output in plain ASCII text only, without color or style.
-
-      __--ansi__
-          Use formatting even in environments which probably don't support it.
-          Example: arc --ansi unit | less -r
-
-      __--load-phutil-library=/path/to/library__
-          Ignore libraries listed in .arcconfig and explicitly load specified
-          libraries instead. Mostly useful for Arcanist development.
-
-      __--conduit-uri__ __uri__
-          Ignore configured Conduit URI and use an explicit one instead. Mostly
-          useful for Arcanist development.
-
-      __--conduit-token__ __token__
-          Ignore configured credentials and use an explicit API token instead.
-
-      __--conduit-version__ __version__
-          Ignore software version and claim to be running some other version
-          instead. Mostly useful for Arcanist development. May cause bad things
-          to happen.
-
-      __--conduit-timeout__ __timeout__
-          Override the default Conduit timeout. Specified in seconds.
-
-      __--config__ __key=value__
-          Specify a runtime configuration value. This will take precedence
-          over static values, and only affect the current arcanist invocation.
-
-      __--skip-arcconfig__
-          Skip the working copy configuration file
-
-      __--arcrc-file__ __filename__
-          Use provided file instead of ~/.arcrc.
-
-EOTEXT
-    );
-  }
-}
diff --git a/src/workflow/ArcanistWorkflow.php b/src/workflow/ArcanistWorkflow.php
--- a/src/workflow/ArcanistWorkflow.php
+++ b/src/workflow/ArcanistWorkflow.php
@@ -72,11 +72,54 @@
   private $changeCache = array();
   private $conduitEngine;
 
+  private $toolset;
+  private $runtime;
+  private $configurationEngine;
+  private $configurationSourceList;
 
-  public function __construct() {}
+  final public function setToolset(ArcanistToolset $toolset) {
+    $this->toolset = $toolset;
+    return $this;
+  }
+
+  final public function getToolset() {
+    return $this->toolset;
+  }
+
+  final public function setRuntime(ArcanistRuntime $runtime) {
+    $this->runtime = $runtime;
+    return $this;
+  }
+
+  final public function getRuntime() {
+    return $this->runtime;
+  }
+
+  final public function setConfigurationEngine(
+    ArcanistConfigurationEngine $engine) {
+    $this->configurationEngine = $engine;
+    return $this;
+  }
 
+  final public function getConfigurationEngine() {
+    return $this->configurationEngine;
+  }
+
+  final public function setConfigurationSourceList(
+    ArcanistConfigurationSourceList $list) {
+    $this->configurationSourceList = $list;
+    return $this;
+  }
 
-  abstract public function run();
+  final public function getConfigurationSourceList() {
+    return $this->configurationSourceList;
+  }
+
+  public function __construct() {}
+
+  public function run() {
+    throw new PhutilMethodNotImplementedException();
+  }
 
   /**
    * Finalizes any cleanup operations that need to occur regardless of
@@ -99,17 +142,21 @@
    *
    * @return string  6-space indented list of available command synopses.
    */
-  abstract public function getCommandSynopses();
+  public function getCommandSynopses() {
+    return array();
+  }
 
   /**
    * Return console formatted string with command help printed in `arc help`.
    *
    * @return string  10-space indented help to use the command.
    */
-  abstract public function getCommandHelp();
+  public function getCommandHelp() {
+    return null;
+  }
 
-  final public function supportsToolset($toolset) {
-    return ($toolset === 'arc');
+  public function supportsToolset(ArcanistToolset $toolset) {
+    return false;
   }