diff --git a/src/multi_agent_conductor.py b/src/multi_agent_conductor.py
index 37268b59..c4e73598 100644
--- a/src/multi_agent_conductor.py
+++ b/src/multi_agent_conductor.py
@@ -588,7 +588,7 @@ def run_worker_lifecycle(ticket: Ticket, context: WorkerContext, context_files:
  ai_client.set_current_tier(f"Tier 3 (Worker): {ticket.id}")
  try:
   comms_baseline = len(ai_client.get_comms_log())
-  response = ai_client.send(
+  result = ai_client.send_result(
    md_content=md_content,
    user_message=user_message,
    base_dir=".",
@@ -597,6 +597,16 @@ def run_worker_lifecycle(ticket: Ticket, context: WorkerContext, context_files:
    patch_callback=ai_client.run_tier4_patch_callback,
    stream_callback=stream_callback
   )
+  if not result.ok:
+   err = result.errors[0] if result.errors else None
+   err_msg = err.ui_message() if err else "unknown error"
+   print(f"[MMA] Worker send_result failed for {ticket.id}: {err_msg}")
+   if event_queue:
+    _queue_put(event_queue, "response", {"text": f"\n\n[ERROR] {err_msg}", "stream_id": f"Tier 3 (Worker): {ticket.id}", "status": "error", "role": "Vendor API"})
+    _queue_put(event_queue, "ticket_completed", {"ticket_id": ticket.id, "timestamp": time.time()})
+   ticket.status = "error"
+   return None
+  response = result.data
  finally:
   ai_client.set_comms_log_callback(old_comms_cb)
   ai_client.set_current_tier(None)