diff --git a/dap-gateway/src/main/java/io/shinhanlife/dap/mcg/sync/CustomWebMvcSseServerTransportProvider.java b/dap-gateway/src/main/java/io/shinhanlife/dap/mcg/sync/CustomWebMvcSseServerTransportProvider.java
index f4264145..3442344d 100644
--- a/dap-gateway/src/main/java/io/shinhanlife/dap/mcg/sync/CustomWebMvcSseServerTransportProvider.java
+++ b/dap-gateway/src/main/java/io/shinhanlife/dap/mcg/sync/CustomWebMvcSseServerTransportProvider.java
@@ -210,13 +210,13 @@ public class CustomWebMvcSseServerTransportProvider implements McpServerTranspor
         @Override
         public Mono<Void> sendMessage(McpSchema.JSONRPCMessage message) {
             return Mono.fromRunnable(() -> {
-                log.info("Sending message to SSE stream: " + message.getClass().getName());
+                log.debug("Sending message to SSE stream: {}", message.getClass().getName());
                 try {
                     String json = objectMapper.writeValueAsString(message);
-                    log.info("Serialized message: " + json);
+                    log.debug("Serialized message: {}", json);
                     if (this.emitter != null) {
                         this.emitter.send(org.springframework.web.servlet.mvc.method.annotation.SseEmitter.event().name("message").data(json));
-                        log.info("Message successfully sent to SSE emitter");
+                        log.debug("Message successfully sent to SSE emitter");
                         
                         // Custom 프로토콜: 1회 요청당 1응답 후 종료 (스트림을 닫아버림)
                         // 클라이언트가 한 번의 POST 후 응답을 받고 연결을 끊기 때문