diff --git a/src/browse/workflow/ArcanistBrowseWorkflow.php b/src/browse/workflow/ArcanistBrowseWorkflow.php
--- a/src/browse/workflow/ArcanistBrowseWorkflow.php
+++ b/src/browse/workflow/ArcanistBrowseWorkflow.php
@@ -58,7 +58,7 @@
     );
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $targets = $this->getArgument('targets');
     $targets = array_fuse($targets);
 
diff --git a/src/phage/workflow/PhageExecWorkflow.php b/src/phage/workflow/PhageExecWorkflow.php
--- a/src/phage/workflow/PhageExecWorkflow.php
+++ b/src/phage/workflow/PhageExecWorkflow.php
@@ -20,7 +20,7 @@
       ->setSynopsis(pht('Execute a Phage subprocess.'));
   }
 
-  protected function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $argv = $this->getArgument('argv');
     if (!$argv) {
       throw new PhutilArgumentUsageException(
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
@@ -91,7 +91,7 @@
     );
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $argv = $this->getArgument('argv');
 
     $is_list = false;
diff --git a/src/toolset/workflow/ArcanistPromptsWorkflow.php b/src/toolset/workflow/ArcanistPromptsWorkflow.php
--- a/src/toolset/workflow/ArcanistPromptsWorkflow.php
+++ b/src/toolset/workflow/ArcanistPromptsWorkflow.php
@@ -56,7 +56,7 @@
     );
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $argv = $this->getArgument('argv');
 
     if (!$argv) {
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
@@ -86,7 +86,7 @@
     );
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $log = $this->getLogEngine();
 
     $argv = $this->getArgument('argv');
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
@@ -31,7 +31,7 @@
     return array();
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     // TOOLSETS: Show the toolset version, not just the "arc" version.
 
     $console = PhutilConsole::getConsole();
diff --git a/src/workflow/ArcanistAmendWorkflow.php b/src/workflow/ArcanistAmendWorkflow.php
--- a/src/workflow/ArcanistAmendWorkflow.php
+++ b/src/workflow/ArcanistAmendWorkflow.php
@@ -60,7 +60,7 @@
     );
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $symbols = $this->getSymbolEngine();
 
     $is_show = $this->getArgument('show');
diff --git a/src/workflow/ArcanistAnoidWorkflow.php b/src/workflow/ArcanistAnoidWorkflow.php
--- a/src/workflow/ArcanistAnoidWorkflow.php
+++ b/src/workflow/ArcanistAnoidWorkflow.php
@@ -23,7 +23,7 @@
     return array();
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     if (!Filesystem::binaryExists('python3')) {
       throw new PhutilArgumentUsageException(
         pht(
diff --git a/src/workflow/ArcanistCallConduitWorkflow.php b/src/workflow/ArcanistCallConduitWorkflow.php
--- a/src/workflow/ArcanistCallConduitWorkflow.php
+++ b/src/workflow/ArcanistCallConduitWorkflow.php
@@ -35,7 +35,7 @@
     );
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $method = $this->getArgument('method');
     if (count($method) !== 1) {
       throw new PhutilArgumentUsageException(
diff --git a/src/workflow/ArcanistDownloadWorkflow.php b/src/workflow/ArcanistDownloadWorkflow.php
--- a/src/workflow/ArcanistDownloadWorkflow.php
+++ b/src/workflow/ArcanistDownloadWorkflow.php
@@ -55,7 +55,7 @@
   }
 
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $file_symbols = $this->getArgument('argv');
 
     if (!$file_symbols) {
diff --git a/src/workflow/ArcanistInspectWorkflow.php b/src/workflow/ArcanistInspectWorkflow.php
--- a/src/workflow/ArcanistInspectWorkflow.php
+++ b/src/workflow/ArcanistInspectWorkflow.php
@@ -28,7 +28,7 @@
     );
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $is_explore = $this->getArgument('explore');
     $objects = $this->getArgument('objects');
 
diff --git a/src/workflow/ArcanistLandWorkflow.php b/src/workflow/ArcanistLandWorkflow.php
--- a/src/workflow/ArcanistLandWorkflow.php
+++ b/src/workflow/ArcanistLandWorkflow.php
@@ -292,7 +292,7 @@
     return 50;
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $working_copy = $this->getWorkingCopy();
     $repository_api = $working_copy->getRepositoryAPI();
 
diff --git a/src/workflow/ArcanistLiberateWorkflow.php b/src/workflow/ArcanistLiberateWorkflow.php
--- a/src/workflow/ArcanistLiberateWorkflow.php
+++ b/src/workflow/ArcanistLiberateWorkflow.php
@@ -44,7 +44,7 @@
   }
 
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $log = $this->getLogEngine();
 
     $argv = $this->getArgument('argv');
diff --git a/src/workflow/ArcanistLookWorkflow.php b/src/workflow/ArcanistLookWorkflow.php
--- a/src/workflow/ArcanistLookWorkflow.php
+++ b/src/workflow/ArcanistLookWorkflow.php
@@ -28,7 +28,7 @@
     );
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     echo tsprintf(
       "%!\n\n",
       pht(
diff --git a/src/workflow/ArcanistMarkersWorkflow.php b/src/workflow/ArcanistMarkersWorkflow.php
--- a/src/workflow/ArcanistMarkersWorkflow.php
+++ b/src/workflow/ArcanistMarkersWorkflow.php
@@ -7,7 +7,7 @@
 
   abstract protected function getWorkflowMarkerType();
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $api = $this->getRepositoryAPI();
 
     $marker_type = $this->getWorkflowMarkerType();
diff --git a/src/workflow/ArcanistPasteWorkflow.php b/src/workflow/ArcanistPasteWorkflow.php
--- a/src/workflow/ArcanistPasteWorkflow.php
+++ b/src/workflow/ArcanistPasteWorkflow.php
@@ -46,7 +46,7 @@
     );
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $set_language = $this->getArgument('lang');
     $set_title = $this->getArgument('title');
     $is_browse = $this->getArgument('browse');
diff --git a/src/workflow/ArcanistUpgradeWorkflow.php b/src/workflow/ArcanistUpgradeWorkflow.php
--- a/src/workflow/ArcanistUpgradeWorkflow.php
+++ b/src/workflow/ArcanistUpgradeWorkflow.php
@@ -23,7 +23,7 @@
     return array();
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $log = $this->getLogEngine();
 
     $roots = array(
diff --git a/src/workflow/ArcanistUploadWorkflow.php b/src/workflow/ArcanistUploadWorkflow.php
--- a/src/workflow/ArcanistUploadWorkflow.php
+++ b/src/workflow/ArcanistUploadWorkflow.php
@@ -38,7 +38,7 @@
     );
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     if (!$this->getArgument('paths')) {
       throw new PhutilArgumentUsageException(
         pht('Specify one or more paths to files you want to upload.'));
diff --git a/src/workflow/ArcanistWeldWorkflow.php b/src/workflow/ArcanistWeldWorkflow.php
--- a/src/workflow/ArcanistWeldWorkflow.php
+++ b/src/workflow/ArcanistWeldWorkflow.php
@@ -27,7 +27,7 @@
     );
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $files = $this->getArgument('files');
 
     if (count($files) < 2) {
diff --git a/src/workflow/ArcanistWorkWorkflow.php b/src/workflow/ArcanistWorkWorkflow.php
--- a/src/workflow/ArcanistWorkWorkflow.php
+++ b/src/workflow/ArcanistWorkWorkflow.php
@@ -50,7 +50,7 @@
       ->setHelp($help);
   }
 
-  public function runWorkflow() {
+  protected function runWorkflow(PhutilArgumentParser $unused) {
     $api = $this->getRepositoryAPI();
 
     $work_engine = $api->getWorkEngine();
diff --git a/src/workflow/ArcanistWorkflow.php b/src/workflow/ArcanistWorkflow.php
--- a/src/workflow/ArcanistWorkflow.php
+++ b/src/workflow/ArcanistWorkflow.php
@@ -259,6 +259,15 @@
     throw new PhutilMethodNotImplementedException();
   }
 
+  /**
+   * Modern workflow main method. Must be implemented in child classes.
+   *
+   * @return int exit code
+   */
+  protected function runWorkflow(PhutilArgumentParser $args) {
+    throw new PhutilMethodNotImplementedException();
+  }
+
   /**
    * Finalizes any cleanup operations that need to occur regardless of
    * whether the command succeeded or failed.