diff --git a/axhub-tool-sms/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/sms/SmsToolService.java b/axhub-tool-sms/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/sms/SmsToolService.java
index d29102c..6e49c48 100644
--- a/axhub-tool-sms/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/sms/SmsToolService.java
+++ b/axhub-tool-sms/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/sms/SmsToolService.java
@@ -4,9 +4,10 @@ import io.shinhanlife.axhub.biz.mcp.tool.annotation.McpFunction;
 import io.shinhanlife.axhub.biz.mcp.tool.annotation.McpTool;
 import io.shinhanlife.axhub.biz.mcp.tool.dto.SmsSendReq;
 import io.shinhanlife.axhub.biz.mcp.tool.service.AbstractMcpToolService;
+import io.shinhanlife.axhub.biz.mcp.tool.sms.dto.SmsMciReqDto;
+import io.shinhanlife.axhub.biz.mcp.tool.sms.mapper.SmsMciMapper;
 import lombok.extern.slf4j.Slf4j;
 
-import java.util.HashMap;
 import java.util.Map;
 
 /**
@@ -31,13 +32,11 @@ public class SmsToolService extends AbstractMcpToolService {
     public Object sendSms(SmsSendReq req) {
         log.info("📱 [SMS] SMS 발송 요청 수신. 수신자: {}", req.getPhoneNumber());
 
-        // EAI 연동을 위한 파라미터 변환
-        Map<String, Object> payload = new HashMap<>();
-        payload.put("phone", req.getPhoneNumber());
-        payload.put("content", req.getMessage());
+        // MapStruct를 이용한 자동 매핑 (AI DTO -> MCI DTO)
+        SmsMciReqDto mciReq = SmsMciMapper.INSTANCE.toMciReq(req);
 
-        // 레거시 시스템 연동 (EAI)
-        Map<String, Object> result = executeLegacy("EAI", "SMS_SEND_001", payload);
+        // 레거시 시스템 연동 (EAI) - DTO 객체를 그대로 넘김
+        Map<String, Object> result = executeLegacy("EAI", "SMS_SEND_001", mciReq);
 
         // 결과 가공
         if ("SUCCESS".equals(result.get("status"))) {
diff --git a/axhub-tool-sms/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/sms/dto/SmsMciReqDto.java b/axhub-tool-sms/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/sms/dto/SmsMciReqDto.java
new file mode 100644
index 0000000..3a6ce0b
--- /dev/null
+++ b/axhub-tool-sms/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/sms/dto/SmsMciReqDto.java
@@ -0,0 +1,18 @@
+package io.shinhanlife.axhub.biz.mcp.tool.sms.dto;
+
+import lombok.Builder;
+import lombok.Getter;
+
+@Getter
+@Builder
+public class SmsMciReqDto {
+    /**
+     * EAI 시스템이 요구하는 수신자 번호 파라미터명
+     */
+    private String phone;
+
+    /**
+     * EAI 시스템이 요구하는 메시지 내용 파라미터명
+     */
+    private String content;
+}
diff --git a/axhub-tool-sms/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/sms/mapper/SmsMciMapper.java b/axhub-tool-sms/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/sms/mapper/SmsMciMapper.java
new file mode 100644
index 0000000..1420398
--- /dev/null
+++ b/axhub-tool-sms/src/main/java/io/shinhanlife/axhub/biz/mcp/tool/sms/mapper/SmsMciMapper.java
@@ -0,0 +1,16 @@
+package io.shinhanlife.axhub.biz.mcp.tool.sms.mapper;
+
+import io.shinhanlife.axhub.biz.mcp.tool.dto.SmsSendReq;
+import io.shinhanlife.axhub.biz.mcp.tool.sms.dto.SmsMciReqDto;
+import org.mapstruct.Mapper;
+import org.mapstruct.Mapping;
+
+@Mapper(componentModel = "spring")
+public interface SmsMciMapper {
+
+    SmsMciMapper INSTANCE = org.mapstruct.factory.Mappers.getMapper(SmsMciMapper.class);
+
+    @Mapping(source = "phoneNumber", target = "phone")
+    @Mapping(source = "message", target = "content")
+    SmsMciReqDto toMciReq(SmsSendReq req);
+}