diff --git a/backend/app/utils/agent.py b/backend/app/utils/agent.py
index ac7143dd..68c6b24d 100644
--- a/backend/app/utils/agent.py
+++ b/backend/app/utils/agent.py
@@ -1,5 +1,6 @@
 import asyncio
 import contextvars
+import copy
 import json
 import os
 import platform
@@ -835,8 +836,9 @@ class ListenChatAgent(ChatAgent):
         new_agent.process_task_id = self.process_task_id
 
         # Preserve model_config_dict (including stream setting) from original agent
+        # Use deep copy to ensure isolation - nested dicts won't affect other agents
         if hasattr(self, 'model_backend') and hasattr(self.model_backend, 'model_config_dict'):
-            new_agent.model_backend.model_config_dict.update(self.model_backend.model_config_dict)
+            new_agent.model_backend.model_config_dict = copy.deepcopy(self.model_backend.model_config_dict)
 
         # Copy memory if requested
         if with_memory:
diff --git a/src/store/chatStore.ts b/src/store/chatStore.ts
index 04872073..5c8468f6 100644
--- a/src/store/chatStore.ts
+++ b/src/store/chatStore.ts
@@ -849,18 +849,16 @@ const chatStore = (initial?: Partial<ChatStore>) => createStore<ChatStore>()(
 
 					// Handle streaming agent output during task execution
 					if (agentMessages.step === "streaming_agent_output") {
-						const data = agentMessages.data as { process_task_id?: string; content?: string; is_final?: boolean };
-						const { process_task_id, content, is_final } = data;
-						const currentId = getCurrentTaskId();
+						const { process_task_id, content, is_final } = agentMessages.data;
 						
 						if (!process_task_id) return;
 						
 						if (is_final) {
 							// Clear streaming output when final marker received
-							clearStreamingAgentOutput(currentId, process_task_id);
+							clearStreamingAgentOutput(currentTaskId, process_task_id);
 						} else if (content) {
 							// Append streaming content
-							updateStreamingAgentOutput(currentId, process_task_id, content);
+							updateStreamingAgentOutput(currentTaskId, process_task_id, content);
 						}
 						return;
 					}
diff --git a/src/types/chatbox.d.ts b/src/types/chatbox.d.ts
index 94beef44..e61b59ca 100644
--- a/src/types/chatbox.d.ts
+++ b/src/types/chatbox.d.ts
@@ -127,6 +127,8 @@ declare global {
 			current_length?: number;
 			max_length?: number;
 			text?: string;
+			// Streaming agent output
+			is_final?: boolean;
 		};
 		status?: 'running' | 'filled' | 'completed';
 	}