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
@@ -773,6 +773,7 @@
     'DiffusionCommitTimelineEngine' => 'applications/diffusion/engine/DiffusionCommitTimelineEngine.php',
     'DiffusionCommitTransactionType' => 'applications/diffusion/xaction/DiffusionCommitTransactionType.php',
     'DiffusionCommitVerifyTransaction' => 'applications/diffusion/xaction/DiffusionCommitVerifyTransaction.php',
+    'DiffusionCommitWrongBuildsHeraldField' => 'applications/diffusion/herald/DiffusionCommitWrongBuildsHeraldField.php',
     'DiffusionCompareController' => 'applications/diffusion/controller/DiffusionCompareController.php',
     'DiffusionConduitAPIMethod' => 'applications/diffusion/conduit/DiffusionConduitAPIMethod.php',
     'DiffusionController' => 'applications/diffusion/controller/DiffusionController.php',
@@ -904,6 +905,7 @@
     'DiffusionPreCommitContentRevisionHeraldField' => 'applications/diffusion/herald/DiffusionPreCommitContentRevisionHeraldField.php',
     'DiffusionPreCommitContentRevisionReviewersHeraldField' => 'applications/diffusion/herald/DiffusionPreCommitContentRevisionReviewersHeraldField.php',
     'DiffusionPreCommitContentRevisionSubscribersHeraldField' => 'applications/diffusion/herald/DiffusionPreCommitContentRevisionSubscribersHeraldField.php',
+    'DiffusionPreCommitContentWrongBuildsHeraldField' => 'applications/diffusion/herald/DiffusionPreCommitContentWrongBuildsHeraldField.php',
     'DiffusionPreCommitRefChangeHeraldField' => 'applications/diffusion/herald/DiffusionPreCommitRefChangeHeraldField.php',
     'DiffusionPreCommitRefHeraldField' => 'applications/diffusion/herald/DiffusionPreCommitRefHeraldField.php',
     'DiffusionPreCommitRefHeraldFieldGroup' => 'applications/diffusion/herald/DiffusionPreCommitRefHeraldFieldGroup.php',
@@ -6438,6 +6440,7 @@
     'DiffusionCommitTimelineEngine' => 'PhabricatorTimelineEngine',
     'DiffusionCommitTransactionType' => 'PhabricatorModularTransactionType',
     'DiffusionCommitVerifyTransaction' => 'DiffusionCommitAuditTransaction',
+    'DiffusionCommitWrongBuildsHeraldField' => 'DiffusionCommitHeraldField',
     'DiffusionCompareController' => 'DiffusionController',
     'DiffusionConduitAPIMethod' => 'ConduitAPIMethod',
     'DiffusionController' => 'PhabricatorController',
@@ -6572,6 +6575,7 @@
     'DiffusionPreCommitContentRevisionHeraldField' => 'DiffusionPreCommitContentHeraldField',
     'DiffusionPreCommitContentRevisionReviewersHeraldField' => 'DiffusionPreCommitContentHeraldField',
     'DiffusionPreCommitContentRevisionSubscribersHeraldField' => 'DiffusionPreCommitContentHeraldField',
+    'DiffusionPreCommitContentWrongBuildsHeraldField' => 'DiffusionPreCommitContentHeraldField',
     'DiffusionPreCommitRefChangeHeraldField' => 'DiffusionPreCommitRefHeraldField',
     'DiffusionPreCommitRefHeraldField' => 'HeraldField',
     'DiffusionPreCommitRefHeraldFieldGroup' => 'HeraldFieldGroup',
diff --git a/src/applications/differential/engine/DifferentialDiffExtractionEngine.php b/src/applications/differential/engine/DifferentialDiffExtractionEngine.php
--- a/src/applications/differential/engine/DifferentialDiffExtractionEngine.php
+++ b/src/applications/differential/engine/DifferentialDiffExtractionEngine.php
@@ -281,7 +281,11 @@
         ->setNewValue($revision->getModernRevisionStatus());
     }
 
-    $concerning_builds = $this->loadConcerningBuilds($revision);
+    $concerning_builds = self::loadConcerningBuilds(
+      $this->getViewer(),
+      $revision,
+      $strict = false);
+
     if ($concerning_builds) {
       $build_list = array();
       foreach ($concerning_builds as $build) {
@@ -328,8 +332,11 @@
     $editor->applyTransactions($revision, $xactions);
   }
 
-  private function loadConcerningBuilds(DifferentialRevision $revision) {
-    $viewer = $this->getViewer();
+  public static function loadConcerningBuilds(
+    PhabricatorUser $viewer,
+    DifferentialRevision $revision,
+    $strict) {
+
     $diff = $revision->getActiveDiff();
 
     $buildables = id(new HarbormasterBuildableQuery())
@@ -342,7 +349,6 @@
       return array();
     }
 
-
     $land_key = HarbormasterBuildPlanBehavior::BEHAVIOR_LANDWARNING;
     $behavior = HarbormasterBuildPlanBehavior::getBehavior($land_key);
 
@@ -391,7 +397,13 @@
           // cases where the repository is observed and the fetch pipeline
           // stalls for a while.
 
-          continue;
+          // If we're in strict mode (from a pre-commit content hook), we do
+          // not ignore these, since we're doing an instantaneous check against
+          // the current state.
+
+          if (!$strict) {
+            continue;
+          }
         }
 
         if ($build->isPassed()) {
diff --git a/src/applications/differential/storage/DifferentialRevision.php b/src/applications/differential/storage/DifferentialRevision.php
--- a/src/applications/differential/storage/DifferentialRevision.php
+++ b/src/applications/differential/storage/DifferentialRevision.php
@@ -62,6 +62,7 @@
   const PROPERTY_LINES_ADDED = 'lines.added';
   const PROPERTY_LINES_REMOVED = 'lines.removed';
   const PROPERTY_BUILDABLES = 'buildables';
+  const PROPERTY_WRONG_BUILDS = 'wrong.builds';
 
   public static function initializeNewRevision(PhabricatorUser $actor) {
     $app = id(new PhabricatorApplicationQuery())
diff --git a/src/applications/differential/xaction/DifferentialRevisionWrongBuildsTransaction.php b/src/applications/differential/xaction/DifferentialRevisionWrongBuildsTransaction.php
--- a/src/applications/differential/xaction/DifferentialRevisionWrongBuildsTransaction.php
+++ b/src/applications/differential/xaction/DifferentialRevisionWrongBuildsTransaction.php
@@ -13,6 +13,10 @@
     return $value;
   }
 
+  public function applyInternalEffects($object, $value) {
+    $object->setProperty(DifferentialRevision::PROPERTY_WRONG_BUILDS, true);
+  }
+
   public function getIcon() {
     return 'fa-exclamation';
   }
diff --git a/src/applications/diffusion/herald/DiffusionCommitWrongBuildsHeraldField.php b/src/applications/diffusion/herald/DiffusionCommitWrongBuildsHeraldField.php
new file mode 100644
--- /dev/null
+++ b/src/applications/diffusion/herald/DiffusionCommitWrongBuildsHeraldField.php
@@ -0,0 +1,49 @@
+<?php
+
+final class DiffusionCommitWrongBuildsHeraldField
+  extends DiffusionCommitHeraldField {
+
+  const FIELDCONST = 'diffusion.commit.builds.wrong';
+
+  public function getHeraldFieldName() {
+    return pht('Revision has build warning');
+  }
+
+  public function getFieldGroupKey() {
+    return HeraldRelatedFieldGroup::FIELDGROUPKEY;
+  }
+
+  public function getHeraldFieldValue($object) {
+    $adapter = $this->getAdapter();
+    $viewer = $adapter->getViewer();
+
+    $revision = $adapter->loadDifferentialRevision();
+    if (!$revision) {
+      return false;
+    }
+
+    if ($revision->isPublished()) {
+      $wrong_builds = DifferentialRevision::PROPERTY_WRONG_BUILDS;
+      return !$revision->getProperty($wrong_builds, false);
+    }
+
+    // Reload the revision to pick up active diffs.
+    $revision = id(new DifferentialRevisionQuery())
+      ->setViewer($viewer)
+      ->withPHIDs(array($revision->getPHID()))
+      ->needActiveDiffs(true)
+      ->executeOne();
+
+    $concerning = DifferentialDiffExtractionEngine::loadConcerningBuilds(
+      $viewer,
+      $revision,
+      $strict = false);
+
+    return (bool)$concerning;
+  }
+
+  protected function getHeraldFieldStandardType() {
+    return self::STANDARD_BOOL;
+  }
+
+}
diff --git a/src/applications/diffusion/herald/DiffusionPreCommitContentWrongBuildsHeraldField.php b/src/applications/diffusion/herald/DiffusionPreCommitContentWrongBuildsHeraldField.php
new file mode 100644
--- /dev/null
+++ b/src/applications/diffusion/herald/DiffusionPreCommitContentWrongBuildsHeraldField.php
@@ -0,0 +1,49 @@
+<?php
+
+final class DiffusionPreCommitContentWrongBuildsHeraldField
+  extends DiffusionPreCommitContentHeraldField {
+
+  const FIELDCONST = 'diffusion.pre.content.builds.wrong';
+
+  public function getHeraldFieldName() {
+    return pht('Revision has build warning');
+  }
+
+  public function getFieldGroupKey() {
+    return HeraldRelatedFieldGroup::FIELDGROUPKEY;
+  }
+
+  public function getHeraldFieldValue($object) {
+    $adapter = $this->getAdapter();
+    $viewer = $adapter->getViewer();
+
+    $revision = $adapter->getRevision();
+    if (!$revision) {
+      return false;
+    }
+
+    if ($revision->isPublished()) {
+      $wrong_builds = DifferentialRevision::PROPERTY_WRONG_BUILDS;
+      return !$revision->getProperty($wrong_builds, false);
+    }
+
+    // Reload the revision to pick up active diffs.
+    $revision = id(new DifferentialRevisionQuery())
+      ->setViewer($viewer)
+      ->withPHIDs(array($revision->getPHID()))
+      ->needActiveDiffs(true)
+      ->executeOne();
+
+    $concerning = DifferentialDiffExtractionEngine::loadConcerningBuilds(
+      $viewer,
+      $revision,
+      $strict = true);
+
+    return (bool)$concerning;
+  }
+
+  protected function getHeraldFieldStandardType() {
+    return self::STANDARD_BOOL;
+  }
+
+}