diff --git a/dat-was-lib/src/main/java/io/shinhanlife/dat/lib/mcp/config/JacksonConfig.java b/dat-was-lib/src/main/java/io/shinhanlife/dat/lib/mcp/config/JacksonConfig.java
index e3b39f07..bb653013 100644
--- a/dat-was-lib/src/main/java/io/shinhanlife/dat/lib/mcp/config/JacksonConfig.java
+++ b/dat-was-lib/src/main/java/io/shinhanlife/dat/lib/mcp/config/JacksonConfig.java
@@ -26,7 +26,8 @@ public class JacksonConfig {
 
     // 1. JSON 변환기(ObjectMapper)를 스프링 Bean으로 등록
     @Bean
-    public ObjectMapper jsonMapper() {
+    @Primary
+    public ObjectMapper objectMapper() {
         ObjectMapper mapper = new ObjectMapper();
         mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
         return mapper;