diff --git a/agent/lib/src/agent.dart b/agent/lib/src/agent.dart
index e4d605626b..b60e23eccf 100644
--- a/agent/lib/src/agent.dart
+++ b/agent/lib/src/agent.dart
@@ -41,8 +41,8 @@ class Agent {
     return JSON.decode(resp.body);
   }
 
-  Future<Null> uploadLogChunk(CocoonTask task, String chunk) async {
-    String url = '$baseCocoonUrl/api/append-log?ownerKey=${task.key}';
+  Future<Null> uploadLogChunk(String taskKey, String chunk) async {
+    String url = '$baseCocoonUrl/api/append-log?ownerKey=${taskKey}';
     Response resp = await httpClient.post(url, body: chunk);
     if (resp.statusCode != 200) {
       throw 'Failed uploading log chunk. Server responded with HTTP status ${resp.statusCode}\n'
@@ -102,7 +102,8 @@ class Agent {
     await _cocoon('update-task-status', status);
   }
 
-  Future<Null> reportFailure(String taskKey) async {
+  Future<Null> reportFailure(String taskKey, String reason) async {
+    await uploadLogChunk(taskKey, '\n\nTask failed with the following reason:\n$reason\n');
     await _cocoon('update-task-status', {
       'TaskKey': taskKey,
       'NewStatus': 'Failed',
diff --git a/agent/lib/src/commands/ci.dart b/agent/lib/src/commands/ci.dart
index 96d2b27c9d..56523c62db 100644
--- a/agent/lib/src/commands/ci.dart
+++ b/agent/lib/src/commands/ci.dart
@@ -81,8 +81,9 @@ class ContinuousIntegrationCommand extends Command {
             await _runTask(task);
           }
         } catch(error, stackTrace) {
-          print('ERROR: $error\n$stackTrace');
-          await agent.reportFailure(task.key);
+          String errorMessage = 'ERROR: $error\n$stackTrace';
+          print(errorMessage);
+          await agent.reportFailure(task.key, errorMessage);
         }
       } catch(error, stackTrace) {
         print('ERROR: $error\n$stackTrace');
@@ -102,7 +103,7 @@ class ContinuousIntegrationCommand extends Command {
         await agent.reportSuccess(task.key, result.data, result.benchmarkScoreKeys);
         await _uploadDataToFirebase(task, result);
       } else {
-        await agent.reportFailure(task.key);
+        await agent.reportFailure(task.key, result.reason);
       }
     });
   }
diff --git a/agent/lib/src/runner.dart b/agent/lib/src/runner.dart
index 533b7c7328..4d81043ff2 100644
--- a/agent/lib/src/runner.dart
+++ b/agent/lib/src/runner.dart
@@ -104,7 +104,7 @@ Future<TaskResult> runTask(Agent agent, CocoonTask task) async {
     if (flush || buffer.length > _kLogChunkSize) {
       String chunk = buffer.toString();
       buffer = new StringBuffer();
-      await agent.uploadLogChunk(task, chunk);
+      await agent.uploadLogChunk(task.key, chunk);
     }
   }