diff --git a/WebContent/jsp/onl/admin/authserver/clientManDetail.jsp b/WebContent/jsp/onl/admin/authserver/clientManDetail.jsp
index b505efc..c54b28f 100644
--- a/WebContent/jsp/onl/admin/authserver/clientManDetail.jsp
+++ b/WebContent/jsp/onl/admin/authserver/clientManDetail.jsp
@@ -713,6 +713,10 @@
     color: #dc3545;
     font-weight: bold;
 }
+.api-created {
+    color: #007bff;
+    font-weight: bold;
+}
 </style>
 
 <script>
@@ -732,12 +736,15 @@ function showSyncResultModal(response) {
 
     if (response.success) {
         statusClass = "status-success";
+        var createdCount = response.createdApiSpecCount || 0;
+        var createdMsg = createdCount > 0 ? "<br/><span style='color:#007bff;'>* " + createdCount + "개의 API Spec이 자동 생성되었습니다.</span>" : "";
+
         if (response.action === 'INSERTED') {
-            statusMsg = "<strong>반영 완료</strong> - 포탈에 새로운 인증정보가 생성되었습니다.";
+            statusMsg = "<strong>반영 완료</strong> - 포탈에 새로운 인증정보가 생성되었습니다." + createdMsg;
         } else if (response.action === 'UPDATED') {
-            statusMsg = "<strong>반영 완료</strong> - 기존 포탈 인증정보가 업데이트되었습니다.";
+            statusMsg = "<strong>반영 완료</strong> - 기존 포탈 인증정보가 업데이트되었습니다." + createdMsg;
         } else {
-            statusMsg = "<strong>반영 완료</strong> - " + response.message;
+            statusMsg = "<strong>반영 완료</strong> - " + response.message + createdMsg;
         }
     } else {
         if (response.action === 'SKIPPED_NO_ORG') {
@@ -759,6 +766,7 @@ function showSyncResultModal(response) {
     var targetApis = response.targetApis || [];
     var syncedApis = response.syncedApis || [];
     var invalidApis = response.invalidApis || [];
+    var createdApiSpecs = response.createdApiSpecs || [];
 
     $targetCount.text(targetApis.length);
 
@@ -772,6 +780,9 @@ function showSyncResultModal(response) {
             if (invalidApis.includes(apiId)) {
                 status = "미존재 (APIGW에 없음)";
                 statusClass = "api-invalid";
+            } else if (createdApiSpecs.includes(apiId)) {
+                status = "반영됨 (Spec 신규생성)";
+                statusClass = "api-created";
             } else if (syncedApis.includes(apiId)) {
                 status = "반영됨";
                 statusClass = "api-synced";
diff --git a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientController.java b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientController.java
index e88a32b..78157ed 100644
--- a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientController.java
+++ b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientController.java
@@ -156,6 +156,12 @@ public class ClientController extends OnlBaseAnnotationController {
                 response.put("invalidApis", result.getInvalidApis());
             }
 
+            // 자동 생성된 API Spec 목록 포함
+            if (result.getCreatedApiSpecs() != null && !result.getCreatedApiSpecs().isEmpty()) {
+                response.put("createdApiSpecs", result.getCreatedApiSpecs());
+                response.put("createdApiSpecCount", result.getCreatedApiSpecCount());
+            }
+
             return ResponseEntity.ok(response);
         } catch (Exception e) {
             // 에러 처리
diff --git a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientManService.java b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientManService.java
index 198d81b..720e356 100644
--- a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientManService.java
+++ b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/ClientManService.java
@@ -1,5 +1,7 @@
 package com.eactive.eai.rms.onl.manage.authserver.client;
 
+import com.eactive.apim.portal.apispec.entity.ApiSpecInfo;
+import com.eactive.apim.portal.apispec.service.ApiSpecInfoService;
 import com.eactive.apim.portal.app.entity.Credential;
 import com.eactive.apim.portal.portalorg.entity.PortalOrg;
 import com.eactive.eai.data.entity.onl.message.EAIMessageEntity;
@@ -43,6 +45,7 @@ public class ClientManService extends OnlBaseService {
 	private CredentialManService credentialManService;
 	private CredentialService credentialService;
 	private EAIMessageService eaiMessageService;
+	private ApiSpecInfoService apiSpecInfoService;
 
 	@Autowired
 	public ClientManService(ClientEntityService clientEntityService,
@@ -51,7 +54,8 @@ public class ClientManService extends OnlBaseService {
 							PortalOrgUIMapper portalOrgUIMapper,
 							CredentialManService credentialManService,
 							CredentialService credentialService,
-							EAIMessageService eaiMessageService) {
+							EAIMessageService eaiMessageService,
+							ApiSpecInfoService apiSpecInfoService) {
 		this.clientEntityService = clientEntityService;
 		this.clientUIMapper = clientUIMapper;
 		this.portalOrgService = portalOrgService;
@@ -59,6 +63,7 @@ public class ClientManService extends OnlBaseService {
 		this.credentialManService = credentialManService;
 		this.credentialService = credentialService;
 		this.eaiMessageService = eaiMessageService;
+		this.apiSpecInfoService = apiSpecInfoService;
 	}
 
 
@@ -168,10 +173,29 @@ public class ClientManService extends OnlBaseService {
 			DataSourceType monitoringType = DataSourceTypeManager.getDataSourceType("MONITORING");
 			DataSourceContextHolder.setDataSourceType(monitoringType);
 
-			// 5. 기존 Credential 확인
+			// 5. PTL_API_SPEC_INFO에 없는 API 자동 생성
+			List<String> createdApiSpecs = new ArrayList<>();
+			if (clientEntity.getApiList() != null && !clientEntity.getApiList().isEmpty()) {
+				for (EAIMessageEntity apiEntity : clientEntity.getApiList()) {
+					String apiId = apiEntity.getEaisvcname();
+					if (!apiSpecInfoService.findById(apiId).isPresent()) {
+						// PTL_API_SPEC_INFO에 없으면 자동 생성
+						ApiSpecInfo newApiSpec = new ApiSpecInfo();
+						newApiSpec.setApiId(apiId);
+						newApiSpec.setApiName(StringUtils.isNotBlank(apiEntity.getEaisvcdesc())
+								? apiEntity.getEaisvcdesc() : apiId);
+						newApiSpec.setApiSimpleDescription(apiEntity.getEaisvcdesc());
+						newApiSpec.setDisplayYn("Y"); // 기본값: 공개
+						apiSpecInfoService.create(newApiSpec);
+						createdApiSpecs.add(apiId);
+					}
+				}
+			}
+
+			// 6. 기존 Credential 확인
 			Credential existingCredential = credentialService.findByClientidAndOrgid(clientId, orgId);
 
-			// 6. 데이터 변환 (ClientEntity → CredentialUI)
+			// 7. 데이터 변환 (ClientEntity → CredentialUI)
 			CredentialUI credentialUI = convertToCredentialUI(clientEntity);
 
 			SyncResult.SyncAction action;
@@ -188,7 +212,7 @@ public class ClientManService extends OnlBaseService {
 					credentialUI.setServer(existing.getServer());
 				}
 
-				// 7. 포탈 스키마에 업데이트
+				// 8. 포탈 스키마에 업데이트
 				credentialManService.update(credentialUI);
 				action = SyncResult.SyncAction.UPDATED;
 			} else {
@@ -197,7 +221,7 @@ public class ClientManService extends OnlBaseService {
 					credentialUI.setAppDescription("APIGW에서 반영된 인증정보");
 				}
 
-				// 7. 포탈 스키마에 신규 생성
+				// 8. 포탈 스키마에 신규 생성
 				credentialManService.insert(credentialUI);
 				action = SyncResult.SyncAction.INSERTED;
 			}
@@ -210,6 +234,8 @@ public class ClientManService extends OnlBaseService {
 					.targetApiCount(requestedApiIds.size())
 					.syncedApis(requestedApiIds)
 					.syncedApiCount(requestedApiIds.size())
+					.createdApiSpecs(createdApiSpecs)
+					.createdApiSpecCount(createdApiSpecs.size())
 					.build();
 
 		} catch (Exception e) {
diff --git a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/SyncResult.java b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/SyncResult.java
index 30de47b..7b9ad83 100644
--- a/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/SyncResult.java
+++ b/src/main/java/com/eactive/eai/rms/onl/manage/authserver/client/SyncResult.java
@@ -56,6 +56,16 @@ public class SyncResult {
      */
     private List<String> invalidApis;
 
+    /**
+     * 자동 생성된 API Spec 목록 (PTL_API_SPEC_INFO에 없어서 새로 생성된 API)
+     */
+    private List<String> createdApiSpecs;
+
+    /**
+     * 자동 생성된 API Spec 개수
+     */
+    private int createdApiSpecCount;
+
     /**
      * 반영 액션 타입
      */