diff --git a/agent/agent_runtime_helpers.py b/agent/agent_runtime_helpers.py
index 27f5f682d48..4d1568cab43 100644
--- a/agent/agent_runtime_helpers.py
+++ b/agent/agent_runtime_helpers.py
@@ -1064,10 +1064,7 @@ def dump_api_request_debug(
 
         timestamp = datetime.now().strftime("%Y%m%d_%H%M%S_%f")
         dump_file = agent.logs_dir / f"request_dump_{agent.session_id}_{timestamp}.json"
-        dump_file.write_text(
-            json.dumps(dump_payload, ensure_ascii=False, indent=2, default=str),
-            encoding="utf-8",
-        )
+        atomic_json_write(dump_file, dump_payload, default=str)
 
         agent._vprint(f"{agent.log_prefix}🧾 Request debug dump written to: {dump_file}")