diff --git a/python/packages/core/agent_framework/_mcp.py b/python/packages/core/agent_framework/_mcp.py
index 9eba9cfc6a..272b291705 100644
--- a/python/packages/core/agent_framework/_mcp.py
+++ b/python/packages/core/agent_framework/_mcp.py
@@ -950,7 +950,7 @@ class MCPTool:
 
         with get_mcp_call_span(span_attributes) as span:
             # Try the operation, reconnecting once if the connection is closed
-            _span_error_set = False
+            span_error_set = False
             for attempt in range(2):
                 try:
                     # Capture the JSON-RPC request ID before the call is made.
@@ -976,11 +976,11 @@ class MCPTool:
                         error_msg = text or str(parsed)
                         span.set_attribute(OtelAttr.ERROR_TYPE, "ToolError")
                         span.set_status(trace.StatusCode.ERROR, error_msg)
-                        _span_error_set = True
+                        span_error_set = True
                         raise ToolExecutionException(error_msg)
                     return parser(result)
                 except ToolExecutionException as ex:
-                    if not _span_error_set:
+                    if not span_error_set:
                         span.set_attribute(OtelAttr.ERROR_TYPE, type(ex).__name__)
                         span.set_status(trace.StatusCode.ERROR, str(ex))
                     raise