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
@@ -966,7 +966,7 @@
     'ArcanistAliasWorkflow' => 'ArcanistWorkflow',
     'ArcanistAliasesConfigOption' => 'ArcanistListConfigOption',
     'ArcanistAmendWorkflow' => 'ArcanistWorkflow',
-    'ArcanistAnoidWorkflow' => 'ArcanistWorkflow',
+    'ArcanistAnoidWorkflow' => 'ArcanistArcWorkflow',
     'ArcanistArcConfigurationEngineExtension' => 'ArcanistConfigurationEngineExtension',
     'ArcanistArcToolset' => 'ArcanistToolset',
     'ArcanistArcWorkflow' => 'ArcanistWorkflow',
@@ -1410,7 +1410,7 @@
     'ArcanistVariableVariableXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
     'ArcanistVariableVariableXHPASTLinterRuleTestCase' => 'ArcanistXHPASTLinterRuleTestCase',
     'ArcanistVersionWorkflow' => 'ArcanistWorkflow',
-    'ArcanistWeldWorkflow' => 'ArcanistWorkflow',
+    'ArcanistWeldWorkflow' => 'ArcanistArcWorkflow',
     'ArcanistWhichWorkflow' => 'ArcanistWorkflow',
     'ArcanistWildConfigOption' => 'ArcanistConfigOption',
     'ArcanistWorkflow' => 'Phobject',
diff --git a/src/runtime/ArcanistRuntime.php b/src/runtime/ArcanistRuntime.php
--- a/src/runtime/ArcanistRuntime.php
+++ b/src/runtime/ArcanistRuntime.php
@@ -139,11 +139,14 @@
     try {
       return $args->parseWorkflowsFull($phutil_workflows);
     } catch (PhutilArgumentUsageException $usage_exception) {
-      $log->writeHint(
-        pht('(::)'),
-        pht(
-          'Workflow is unrecognized by modern "arc", falling through '.
-          'to classic mode.'));
+
+      // TODO: This is very, very hacky; we're trying to let errors like
+      // "you passed the wrong arguments" through but fall back to classic
+      // mode if the workflow itself doesn't exist.
+      if (!preg_match('/invalid command/i', $usage_exception->getMessage())) {
+        throw $usage_exception;
+      }
+
     }
 
     $arcanist_root = phutil_get_library_root('arcanist');
diff --git a/src/toolset/ArcanistWorkflowInformation.php b/src/toolset/ArcanistWorkflowInformation.php
--- a/src/toolset/ArcanistWorkflowInformation.php
+++ b/src/toolset/ArcanistWorkflowInformation.php
@@ -4,6 +4,7 @@
   extends Phobject {
 
   private $help;
+  private $synopsis;
   private $examples = array();
 
   public function setHelp($help) {
@@ -24,4 +25,13 @@
     return $this->examples;
   }
 
+  public function setSynopsis($synopsis) {
+    $this->synopsis = $synopsis;
+    return $this;
+  }
+
+  public function getSynopsis() {
+    return $this->synopsis;
+  }
+
 }
diff --git a/src/toolset/workflow/ArcanistAliasWorkflow.php b/src/toolset/workflow/ArcanistAliasWorkflow.php
--- a/src/toolset/workflow/ArcanistAliasWorkflow.php
+++ b/src/toolset/workflow/ArcanistAliasWorkflow.php
@@ -75,9 +75,10 @@
 );
 
     return $this->newWorkflowInformation()
+      ->setSynopsis(
+        pht('Create and modify command aliases.'))
       ->addExample(pht('**alias**'))
-      ->addExample(pht('**alias** __command__'))
-      ->addExample(pht('**alias** __command__ __target__ -- [__options__]'))
+      ->addExample(pht('**alias** __command__ __target__ -- [__arguments__]'))
       ->setHelp($help);
   }
 
diff --git a/src/toolset/workflow/ArcanistShellCompleteWorkflow.php b/src/toolset/workflow/ArcanistShellCompleteWorkflow.php
--- a/src/toolset/workflow/ArcanistShellCompleteWorkflow.php
+++ b/src/toolset/workflow/ArcanistShellCompleteWorkflow.php
@@ -60,6 +60,7 @@
 );
 
     return $this->newWorkflowInformation()
+      ->setSynopsis(pht('Install shell completion.'))
       ->setHelp($help);
   }
 
diff --git a/src/toolset/workflow/ArcanistVersionWorkflow.php b/src/toolset/workflow/ArcanistVersionWorkflow.php
--- a/src/toolset/workflow/ArcanistVersionWorkflow.php
+++ b/src/toolset/workflow/ArcanistVersionWorkflow.php
@@ -22,6 +22,7 @@
 );
 
     return $this->newWorkflowInformation()
+      ->setSynopsis(pht('Show toolset version information.'))
       ->addExample(pht('**version**'))
       ->setHelp($help);
   }
diff --git a/src/workflow/ArcanistAnoidWorkflow.php b/src/workflow/ArcanistAnoidWorkflow.php
--- a/src/workflow/ArcanistAnoidWorkflow.php
+++ b/src/workflow/ArcanistAnoidWorkflow.php
@@ -1,29 +1,43 @@
 <?php
 
-final class ArcanistAnoidWorkflow extends ArcanistWorkflow {
+final class ArcanistAnoidWorkflow
+  extends ArcanistArcWorkflow {
 
   public function getWorkflowName() {
     return 'anoid';
   }
 
-  public function getCommandSynopses() {
-    return phutil_console_format(<<<EOTEXT
-      **anoid**
+  public function getWorkflowInformation() {
+    $help = pht(<<<EOTEXT
+Take control of a probe launched from the science vessel "Arcanoid".
 EOTEXT
-      );
+);
+
+    return $this->newWorkflowInformation()
+      ->setSynopsis(pht('Pilot a probe from the "Arcanoid".'))
+      ->addExample(pht('**anoid**'))
+      ->setHelp($help);
   }
 
-  public function getCommandHelp() {
-    return phutil_console_format(<<<EOTEXT
-          There's only one way to find out...
-EOTEXT
-      );
+  public function getWorkflowArguments() {
+    return array();
   }
 
-  public function run() {
-    phutil_passthru(
-      '%s/scripts/breakout.py',
-      dirname(phutil_get_library_root('arcanist')));
+  public function runWorkflow() {
+    if (!Filesystem::binaryExists('python3')) {
+      throw new PhutilArgumentUsageException(
+        pht(
+          'The "arc anoid" workflow requires "python3" to be available '.
+          'in your $PATH.'));
+    }
+
+    $support_dir = phutil_get_library_root('arcanist');
+    $support_dir = dirname($support_dir);
+    $support_dir = $support_dir.'/support/';
+
+    $bin = $support_dir.'arcanoid/arcanoid.py';
+
+    return phutil_passthru('%R', $bin);
   }
 
 }
diff --git a/src/workflow/ArcanistLiberateWorkflow.php b/src/workflow/ArcanistLiberateWorkflow.php
--- a/src/workflow/ArcanistLiberateWorkflow.php
+++ b/src/workflow/ArcanistLiberateWorkflow.php
@@ -16,6 +16,8 @@
 );
 
     return $this->newWorkflowInformation()
+      ->setSynopsis(
+        pht('Create or update an Arcanist library.'))
       ->addExample(pht('**liberate**'))
       ->addExample(pht('**liberate** [__path__]'))
       ->setHelp($help);
diff --git a/src/workflow/ArcanistWeldWorkflow.php b/src/workflow/ArcanistWeldWorkflow.php
--- a/src/workflow/ArcanistWeldWorkflow.php
+++ b/src/workflow/ArcanistWeldWorkflow.php
@@ -1,36 +1,37 @@
 <?php
 
-final class ArcanistWeldWorkflow extends ArcanistWorkflow {
+final class ArcanistWeldWorkflow
+  extends ArcanistArcWorkflow {
 
   public function getWorkflowName() {
     return 'weld';
   }
 
-  public function getCommandSynopses() {
-    return phutil_console_format(<<<EOTEXT
-      **weld** [options] __file__ __file__ ...
+  public function getWorkflowInformation() {
+    $help = pht(<<<EOTEXT
+Robustly fuse two or more files together. The resulting joint is much stronger
+than the one created by tools like __cat__.
 EOTEXT
       );
-  }
 
-  public function getCommandHelp() {
-    return phutil_console_format(<<<EOTEXT
-          Robustly fuse two or more files together. The resulting joint is
-          much stronger than the one created by tools like __cat__.
-EOTEXT
-      );
+    return $this->newWorkflowInformation()
+      ->setSynopsis(pht('Robustly fuse files together.'))
+      ->addExample('**weld** [options] -- __file__ __file__ ...')
+      ->setHelp($help);
   }
 
-  public function getArguments() {
+  public function getWorkflowArguments() {
     return array(
-      '*' => 'files',
+      $this->newWorkflowArgument('files')
+        ->setWildcard(true),
     );
   }
 
-  public function run() {
+  public function runWorkflow() {
     $files = $this->getArgument('files');
+
     if (count($files) < 2) {
-      throw new ArcanistUsageException(
+      throw new PhutilArgumentUsageException(
         pht('Specify two or more files to weld together.'));
     }
 
diff --git a/src/workflow/ArcanistWorkflow.php b/src/workflow/ArcanistWorkflow.php
--- a/src/workflow/ArcanistWorkflow.php
+++ b/src/workflow/ArcanistWorkflow.php
@@ -128,6 +128,10 @@
 
     $information = $this->getWorkflowInformation();
     if ($information) {
+      $synopsis = $information->getSynopsis();
+      if (strlen($synopsis)) {
+        $phutil_workflow->setSynopsis($synopsis);
+      }
 
       $examples = $information->getExamples();
       if ($examples) {
@@ -142,7 +146,6 @@
 
         $phutil_workflow->setHelp($help);
       }
-
     }
 
     return $phutil_workflow;
diff --git a/scripts/breakout.py b/support/arcanoid/arcanoid.py
rename from scripts/breakout.py
rename to support/arcanoid/arcanoid.py
--- a/scripts/breakout.py
+++ b/support/arcanoid/arcanoid.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 import sys
 import time
 import select
@@ -17,10 +17,10 @@
     total = 0
 
     def __init__(self, x, y, w, h, c):
-        self.x = x
-        self.y = y
-        self.w = w
-        self.h = h
+        self.x = int(round(x))
+        self.y = int(round(y))
+        self.w = int(round(w))
+        self.h = int(round(h))
         self.fmt = curses.A_BOLD | curses.color_pair(c)
         self.alive = True
         for i in range(self.x, self.x + self.w):
@@ -48,8 +48,8 @@
     killed = 0
 
     def __init__(self, x, y, vx, vy):
-        self.x = x
-        self.y = y
+        self.x = int(round(x))
+        self.y = int(round(y))
         self.vx = vx
         self.vy = vy
         Ball.alive = True
@@ -58,6 +58,8 @@
         return True
 
     def encounter(self, dx, dy):
+        dx = int(round(dx))
+        dy = int(round(dy))
         ent = grid[self.y + dy + 1][self.x + dx + 1]
         if ent and not ent.collide(self):
             self.vx -= 2 * dx
@@ -84,8 +86,8 @@
 
 class Ship:
     def __init__(self, x, y):
-        self.x = x
-        self.y = y
+        self.x = int(round(x))
+        self.y = int(round(y))
         self.hw = 10
         self.v = 4
         self.last = 1
@@ -164,7 +166,7 @@
 
     colors = [ 1, 3, 2, 6, 4, 5 ]
     h = height / 10
-    for x in range(1, width / 7 - 1):
+    for x in range(1, int(width / 7) - 1):
         for y in range(1, 7):
             entities.append(Block(x * 7,
                                   y * h + x / 2 % 2,