fix: return AgentBus attachment rejections

control-plane/src/agentbus.ts

@@ -1019,6 +1019,30 @@ export class AgentBusListener {
       attached: result.attached,
       created: result.created
     }, 'AgentBus message ingested into task service');
+    const rejectedAttachment = result.input_attachment?.status === 'rejected'
+      ? result.input_attachment
+      : null;
+    if (rejectedAttachment) {
+      this.logger.warn({
+        agentbus_event: 'attachment_rejection_reply_requested',
+        inbound_frame_id: taskId,
+        task_id: result.task.task_id,
+        task_status: result.task.status,
+        error_code: rejectedAttachment.error_code || 'roster_workbook_processing_failed'
+      }, 'AgentBus roster attachment rejection reply requested');
+      if (this.durableDeliveryEnabled() && this.channel && this.tasks.enqueueAgentBusResult) {
+        await this.tasks.enqueueAgentBusResult.call(this.tasks, this.channel.id, taskId, {
+          event: 'task.result',
+          status: 'failed',
+          task_id: result.task.task_id,
+          text: rejectedAttachment.message.slice(0, 20_000)
+        });
+        await this.flushDurableDeliveries();
+      } else {
+        this.queueFinalReply(frame, 'failed', rejectedAttachment.message);
+      }
+      return;
+    }
     this.logger.info({
       agentbus_event: 'parse_queue_requested',
       inbound_frame_id: taskId,