diff --git a/agent/tool_executor.py b/agent/tool_executor.py
index d235de36c03d..a5729a2e8f50 100644
--- a/agent/tool_executor.py
+++ b/agent/tool_executor.py
@@ -964,7 +964,8 @@ def execute_tool_calls_concurrent(agent, assistant_message, messages: list, effe
                 print(f"  ✅ Tool {i+1} completed in {tool_duration:.2f}s - {response_preview}")
 
         agent._current_tool = None
-        agent._touch_activity(f"tool completed: {name} ({tool_duration:.1f}s)")
+        _status_suffix = " (error)" if is_error else ""
+        agent._touch_activity(f"tool completed: {name} ({tool_duration:.1f}s){_status_suffix}")
 
         if not blocked and agent.tool_complete_callback:
             try:
@@ -1655,7 +1656,8 @@ def execute_tool_calls_sequential(agent, assistant_message, messages: list, effe
                 logging.debug(f"Tool progress callback error: {cb_err}")
 
         agent._current_tool = None
-        agent._touch_activity(f"tool completed: {function_name} ({tool_duration:.1f}s)")
+        _status_suffix = " (error)" if _is_error_result else ""
+        agent._touch_activity(f"tool completed: {function_name} ({tool_duration:.1f}s){_status_suffix}")
 
         if agent.verbose_logging:
             logging.debug(f"Tool {function_name} completed in {tool_duration:.2f}s")