diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index 9bd23305..90e2e2ef 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -126,6 +126,7 @@ phutil_register_library_map(array(
     'ArcanistComprehensiveLintEngine' => 'lint/engine/ArcanistComprehensiveLintEngine.php',
     'ArcanistConcatenationOperatorXHPASTLinterRule' => 'lint/linter/xhpast/rules/ArcanistConcatenationOperatorXHPASTLinterRule.php',
     'ArcanistConcatenationOperatorXHPASTLinterRuleTestCase' => 'lint/linter/xhpast/rules/__tests__/ArcanistConcatenationOperatorXHPASTLinterRuleTestCase.php',
+    'ArcanistConduitAuthenticationException' => 'exception/ArcanistConduitAuthenticationException.php',
     'ArcanistConduitCallFuture' => 'conduit/ArcanistConduitCallFuture.php',
     'ArcanistConduitEngine' => 'conduit/ArcanistConduitEngine.php',
     'ArcanistConduitException' => 'conduit/ArcanistConduitException.php',
@@ -1170,6 +1171,7 @@ phutil_register_library_map(array(
     'ArcanistComprehensiveLintEngine' => 'ArcanistLintEngine',
     'ArcanistConcatenationOperatorXHPASTLinterRule' => 'ArcanistXHPASTLinterRule',
     'ArcanistConcatenationOperatorXHPASTLinterRuleTestCase' => 'ArcanistXHPASTLinterRuleTestCase',
+    'ArcanistConduitAuthenticationException' => 'Exception',
     'ArcanistConduitCallFuture' => 'FutureProxy',
     'ArcanistConduitEngine' => 'Phobject',
     'ArcanistConduitException' => 'Exception',
diff --git a/src/conduit/ArcanistConduitCallFuture.php b/src/conduit/ArcanistConduitCallFuture.php
index 01d9954d..187b4c27 100644
--- a/src/conduit/ArcanistConduitCallFuture.php
+++ b/src/conduit/ArcanistConduitCallFuture.php
@@ -15,61 +15,56 @@ final class ArcanistConduitCallFuture
   }
 
   private function raiseLoginRequired() {
-    $conduit_uri = $this->getEngine()->getConduitURI();
-    $conduit_uri = new PhutilURI($conduit_uri);
-    $conduit_uri->setPath('/');
+    $conduit_domain = $this->getConduitDomain();
 
-    $conduit_domain = $conduit_uri->getDomain();
-
-    $block = id(new PhutilConsoleBlock())
-      ->addParagraph(
-        tsprintf(
-          '**<bg:red> %s </bg>**',
-          pht('LOGIN REQUIRED')))
-      ->addParagraph(
+    $message = array(
+      tsprintf(
+        "\n\n%W\n\n",
         pht(
           'You are trying to connect to a server ("%s") that you do not '.
           'have any stored credentials for, but the command you are '.
           'running requires authentication.',
-          $conduit_domain))
-      ->addParagraph(
+          $conduit_domain)),
+      tsprintf(
+        "%W\n\n",
         pht(
-          'To login and save credentials for this server, run this '.
-          'command:'))
-      ->addParagraph(
-        tsprintf(
-          "    $ arc install-certificate %s\n",
-          $conduit_uri));
+          'To log in and save credentials for this server, run this '.
+          'command:')),
+      tsprintf(
+        '%>',
+        $this->getInstallCommand()),
+    );
 
-    throw new PhutilArgumentUsageException($block->drawConsoleString());
+    $this->raiseException(
+      pht('Conduit API login required.'),
+      pht('LOGIN REQUIRED'),
+      $message);
   }
 
   private function raiseInvalidAuth() {
-    $conduit_uri = $this->getEngine()->getConduitURI();
-    $conduit_uri = new PhutilURI($conduit_uri);
-    $conduit_uri->setPath('/');
+    $conduit_domain = $this->getConduitDomain();
 
-    $conduit_domain = $conduit_uri->getDomain();
-
-    $block = id(new PhutilConsoleBlock())
-      ->addParagraph(
-        tsprintf(
-          '**<bg:red> %s </bg>**',
-          pht('INVALID CREDENTIALS')))
-      ->addParagraph(
+    $message = array(
+      tsprintf(
+        "\n\n%W\n\n",
         pht(
-          'Your stored credentials for this server ("%s") are not valid.',
-          $conduit_domain))
-      ->addParagraph(
+          'Your stored credentials for the server you are trying to connect '.
+          'to ("%s") are not valid.',
+          $conduit_domain)),
+      tsprintf(
+        "%W\n\n",
         pht(
-          'To login and save valid credentials for this server, run this '.
-          'command:'))
-      ->addParagraph(
-        tsprintf(
-          "    $ arc install-certificate %s\n",
-          $conduit_uri));
+          'To log in and save valid credentials for this server, run this '.
+          'command:')),
+      tsprintf(
+        '%>',
+        $this->getInstallCommand()),
+    );
 
-    throw new PhutilArgumentUsageException($block->drawConsoleString());
+    $this->raiseException(
+      pht('Invalid Conduit API credentials.'),
+      pht('INVALID CREDENTIALS'),
+      $message);
   }
 
   protected function didReceiveResult($result) {
@@ -91,4 +86,31 @@ final class ArcanistConduitCallFuture
     throw $exception;
   }
 
+  private function getInstallCommand() {
+    $conduit_uri = $this->getConduitURI();
+
+    return csprintf(
+      'arc install-certificate %s',
+      $conduit_uri);
+  }
+
+  private function getConduitURI() {
+    $conduit_uri = $this->getEngine()->getConduitURI();
+    $conduit_uri = new PhutilURI($conduit_uri);
+    $conduit_uri->setPath('/');
+
+    return $conduit_uri;
+  }
+
+  private function getConduitDomain() {
+    $conduit_uri = $this->getConduitURI();
+    return $conduit_uri->getDomain();
+  }
+
+  private function raiseException($summary, $title, $body) {
+    throw id(new ArcanistConduitAuthenticationException($summary))
+      ->setTitle($title)
+      ->setBody($body);
+  }
+
 }
diff --git a/src/exception/ArcanistConduitAuthenticationException.php b/src/exception/ArcanistConduitAuthenticationException.php
new file mode 100644
index 00000000..72345453
--- /dev/null
+++ b/src/exception/ArcanistConduitAuthenticationException.php
@@ -0,0 +1,27 @@
+<?php
+
+final class ArcanistConduitAuthenticationException
+  extends Exception {
+
+  private $title;
+  private $body;
+
+  public function setTitle($title) {
+    $this->title = $title;
+    return $this;
+  }
+
+  public function getTitle() {
+    return $this->title;
+  }
+
+  public function setBody($body) {
+    $this->body = $body;
+    return $this;
+  }
+
+  public function getBody() {
+    return $this->body;
+  }
+
+}
diff --git a/src/runtime/ArcanistRuntime.php b/src/runtime/ArcanistRuntime.php
index 485857f3..87d574a5 100644
--- a/src/runtime/ArcanistRuntime.php
+++ b/src/runtime/ArcanistRuntime.php
@@ -41,6 +41,8 @@ final class ArcanistRuntime {
       $log->writeError(pht('USAGE EXCEPTION'), $ex->getMessage());
     } catch (ArcanistUserAbortException $ex) {
       $log->writeError(pht('---'), $ex->getMessage());
+    } catch (ArcanistConduitAuthenticationException $ex) {
+      $log->writeError($ex->getTitle(), $ex->getBody());
     }
 
     return 1;