diff --git a/src/mana_plugin_root_histogram.cc b/src/mana_plugin_root_histogram.cc
index cb920b9..606950b 100644
--- a/src/mana_plugin_root_histogram.cc
+++ b/src/mana_plugin_root_histogram.cc
@@ -140,6 +140,10 @@ MANA_DEFINE_PLUGIN_BEGIN_RUN(begin_run)
     log_info("hitCount histograms: %s", histo_info(ctx->hitCounts).c_str());
     log_info("raw histograms: %s", histo_info(ctx->rawHistograms).c_str());
     log_info("writing histograms into: %s", filename.c_str());
+    mana_status_t result;
+    result.code = mana_status_ok;
+    strncpy(result.message, "ok", sizeof(result.message));
+    return result;
 }
 
 MANA_DEFINE_PLUGIN_END_RUN(end_run)
@@ -150,6 +154,10 @@ MANA_DEFINE_PLUGIN_END_RUN(end_run)
     auto ctx = reinterpret_cast<Context *>(context);
     ctx->outputFile->Write();
     *ctx = {};
+    mana_status_t result;
+    result.code = mana_status_ok;
+    strncpy(result.message, "ok", sizeof(result.message));
+    return result;
 }
 
 MANA_DEFINE_PLUGIN_EVENT_DATA(process_event)
diff --git a/src/mana_plugin_root_rntuple_writer.cc b/src/mana_plugin_root_rntuple_writer.cc
index 69125f9..d3a737a 100644
--- a/src/mana_plugin_root_rntuple_writer.cc
+++ b/src/mana_plugin_root_rntuple_writer.cc
@@ -66,7 +66,12 @@ MANA_DEFINE_PLUGIN_BEGIN_RUN(begin_run)
     if (jRun["events"].size() > 1)
     {
         log_error("root-rntuple-writer: currently only supports a single event/trigger");
-        return;
+        mana_status_t result;
+        result.code = mana_status_invalid_argument;
+        strncpy(result.message,
+                "root-rntuple-writer currently only supports a single event/trigger",
+                sizeof(result.message));
+        return result;
     }
 
     auto ctx = reinterpret_cast<Context *>(context);
@@ -90,6 +95,10 @@ MANA_DEFINE_PLUGIN_BEGIN_RUN(begin_run)
 
     ctx->writer =
         RNTupleWriter::Recreate(std::move(model), jEvent["name"].get<std::string>(), filename);
+    mana_status_t result;
+    result.code = mana_status_ok;
+    strncpy(result.message, "ok", sizeof(result.message));
+    return result;
 }
 
 MANA_DEFINE_PLUGIN_END_RUN(end_run)
@@ -99,6 +108,10 @@ MANA_DEFINE_PLUGIN_END_RUN(end_run)
     log_debug("end: context=%p, descriptor_json=%s", context, descriptor_json);
     auto ctx = reinterpret_cast<Context *>(context);
     *ctx = {};
+    mana_status_t result;
+    result.code = mana_status_ok;
+    strncpy(result.message, "ok", sizeof(result.message));
+    return result;
 }
 
 MANA_DEFINE_PLUGIN_EVENT_DATA(process_event)