diff --git a/scripts/arcanist.php b/scripts/arcanist.php
--- a/scripts/arcanist.php
+++ b/scripts/arcanist.php
@@ -620,9 +620,9 @@
         throw new ArcanistUsageException($error);
       } else {
         fwrite(STDERR, phutil_console_wrap(
-          "%s: %s\n\n",
-          pht('WARNING'),
-          $error));
+          phutil_console_format("%s: %s\n",
+                                pht('WARNING'),
+                                $error)));
       }
     } catch (PhutilLibraryConflictException $ex) {
       if ($ex->getLibrary() != 'arcanist') {
diff --git a/src/workflow/ArcanistDiffWorkflow.php b/src/workflow/ArcanistDiffWorkflow.php
--- a/src/workflow/ArcanistDiffWorkflow.php
+++ b/src/workflow/ArcanistDiffWorkflow.php
@@ -1030,9 +1030,8 @@
               } catch (ConduitClientException $e) {
                 if ($e->getErrorCode() == 'ERR-BAD-ARCANIST-PROJECT') {
                   echo phutil_console_wrap(
-                    "%s\n",
-                    pht('Lookup of encoding in arcanist project failed'),
-                    $e->getMessage());
+                    pht('Lookup of encoding in arcanist project failed: %s',
+                        $e->getMessage())."\n");
                 } else {
                   throw $e;
                 }
diff --git a/src/workflow/ArcanistWorkflow.php b/src/workflow/ArcanistWorkflow.php
--- a/src/workflow/ArcanistWorkflow.php
+++ b/src/workflow/ArcanistWorkflow.php
@@ -1585,12 +1585,11 @@
     } catch (ConduitClientException $ex) {
       if ($ex->getErrorCode() == 'ERR-CONDUIT-CALL') {
         echo phutil_console_wrap(
-          "%s\n\n",
           pht(
             'This feature requires a newer version of Phabricator. Please '.
             'update it using these instructions: %s',
             'https://secure.phabricator.com/book/phabricator/article/'.
-              'upgrading/'));
+              'upgrading/')."\n\n");
       }
       throw $ex;
     }