diff --git a/api/docs.go b/api/docs.go
index 1df3bb2..8b6c21f 100644
--- a/api/docs.go
+++ b/api/docs.go
@@ -8558,8 +8558,8 @@ var SwaggerInfo = &swag.Spec{
 	Host:             "localhost:8056",
 	BasePath:         "/beetle",
 	Schemes:          []string{},
-	Title:            "CM-Beetle REST API",
-	Description:      "CM-Beetle REST API",
+	Title:            "CM-Beetle API",
+	Description:      "CM-Beetle recommends optimal target cloud infrastructure and executes migration.",
 	InfoInstanceName: "swagger",
 	SwaggerTemplate:  docTemplate,
 	LeftDelim:        "{{",
diff --git a/api/swagger.json b/api/swagger.json
index bfa3939..7815971 100644
--- a/api/swagger.json
+++ b/api/swagger.json
@@ -1,8 +1,8 @@
 {
     "swagger": "2.0",
     "info": {
-        "description": "CM-Beetle REST API",
-        "title": "CM-Beetle REST API",
+        "description": "CM-Beetle recommends optimal target cloud infrastructure and executes migration.",
+        "title": "CM-Beetle API",
         "contact": {
             "name": "API Support",
             "url": "https://github.com/cloud-barista/cm-beetle/issues/new/choose"
diff --git a/api/swagger.yaml b/api/swagger.yaml
index 3d25201..326c494 100644
--- a/api/swagger.yaml
+++ b/api/swagger.yaml
@@ -4043,11 +4043,12 @@ info:
   contact:
     name: API Support
     url: https://github.com/cloud-barista/cm-beetle/issues/new/choose
-  description: CM-Beetle REST API
+  description: CM-Beetle recommends optimal target cloud infrastructure and executes
+    migration.
   license:
     name: Apache 2.0
     url: http://www.apache.org/licenses/LICENSE-2.0.html
-  title: CM-Beetle REST API
+  title: CM-Beetle API
   version: latest
 paths:
   /httpVersion:
diff --git a/cmd/cm-beetle/main.go b/cmd/cm-beetle/main.go
index 83806ca..5aa5cae 100644
--- a/cmd/cm-beetle/main.go
+++ b/cmd/cm-beetle/main.go
@@ -124,9 +124,9 @@ func checkReadiness(url string) (bool, error) {
 	return true, nil
 }
 
-// @title CM-Beetle REST API
+// @title CM-Beetle API
 // @version latest
-// @description CM-Beetle REST API
+// @description CM-Beetle recommends optimal target cloud infrastructure and executes migration.
 // // @termsOfService none
 
 // @contact.name API Support
diff --git a/deployments/docker-compose/docker-compose.yaml b/deployments/docker-compose/docker-compose.yaml
index 58db9bb..b6dee8e 100644
--- a/deployments/docker-compose/docker-compose.yaml
+++ b/deployments/docker-compose/docker-compose.yaml
@@ -29,10 +29,10 @@ services:
       # - BEETLE_ROOT=/app
       - BEETLE_SELF_ENDPOINT=localhost:8056
       # - BEETLE_API_ALLOW_ORIGINS=*
-      - BEETLE_API_AUTH_ENABLED=true
-      - BEETLE_API_AUTH_MODE=basic
-      - BEETLE_API_USERNAME=default
-      - BEETLE_API_PASSWORD=default
+      # - BEETLE_API_AUTH_ENABLED=true
+      # - BEETLE_API_AUTH_MODE=basic
+      # - BEETLE_API_USERNAME=default
+      # - BEETLE_API_PASSWORD=default
       # - BEETLE_LKVSTORE_PATH=/app/db/beetle.db
       # - BEETLE_LOGFILE_PATH=/app/log/beetle.log
       # - BEETLE_LOGFILE_MAXSIZE=1000
diff --git a/pkg/api/rest/middlewares/response-dump.go b/pkg/api/rest/middlewares/response-dump.go
index 8ce327a..47a8638 100644
--- a/pkg/api/rest/middlewares/response-dump.go
+++ b/pkg/api/rest/middlewares/response-dump.go
@@ -93,13 +93,24 @@ func ResponseBodyDump() echo.MiddlewareFunc {
 						break processResponse
 					}
 
-					if message, exists := lastResData["message"]; exists && message != nil {
-						if msgStr, ok := message.(string); ok {
-							details.ErrorResponse = msgStr
-						} else {
-							details.ErrorResponse = "Error response message is not a string"
+					// Prioritize 'error' field from ApiResponse
+					if errVal, exists := lastResData["error"]; exists && errVal != nil {
+						if errStr, ok := errVal.(string); ok {
+							details.ErrorResponse = errStr
 						}
-					} else {
+					}
+
+					// Fallback to 'message' field if 'error' is missing or empty
+					if details.ErrorResponse == "" {
+						if msgVal, exists := lastResData["message"]; exists && msgVal != nil {
+							if msgStr, ok := msgVal.(string); ok {
+								details.ErrorResponse = msgStr
+							}
+						}
+					}
+
+					// Final fallback
+					if details.ErrorResponse == "" {
 						details.ErrorResponse = "No error message found"
 					}
 					break processResponse
diff --git a/pkg/api/rest/model/beetle/response.go b/pkg/api/rest/model/beetle/response.go
index 10f8d04..4edde56 100644
--- a/pkg/api/rest/model/beetle/response.go
+++ b/pkg/api/rest/model/beetle/response.go
@@ -58,6 +58,7 @@ type Page[T any] struct {
 // -------------------------------------------------------------------
 
 // SuccessResponse creates a successful API response for a single object or any generic data.
+// T is the type of the response data.
 // Usage:
 //   - Single Object: SuccessResponse(user) -> Data: User
 //   - Raw List:      SuccessResponse(users) -> Data: []User
@@ -69,6 +70,7 @@ func SuccessResponse[T any](data T) ApiResponse[T] {
 }
 
 // SuccessResponseWithMessage creates a successful API response with a custom message.
+// T is the type of the response data.
 func SuccessResponseWithMessage[T any](data T, message string) ApiResponse[T] {
 	return ApiResponse[T]{
 		Success: true,
@@ -80,6 +82,7 @@ func SuccessResponseWithMessage[T any](data T, message string) ApiResponse[T] {
 // SuccessListResponse is a convenience wrapper for list responses.
 // It explicitly takes a slice and returns ApiResponse[[]T].
 // This ensures that the Data field is always a JSON array.
+// T is the type of items in the list.
 func SuccessListResponse[T any](items []T) ApiResponse[[]T] {
 	return ApiResponse[[]T]{
 		Success: true,
@@ -88,6 +91,7 @@ func SuccessListResponse[T any](items []T) ApiResponse[[]T] {
 }
 
 // SuccessListResponseWithMessage creates a successful list API response with a custom message.
+// T is the type of items in the list.
 func SuccessListResponseWithMessage[T any](items []T, message string) ApiResponse[[]T] {
 	return ApiResponse[[]T]{
 		Success: true,
@@ -98,6 +102,7 @@ func SuccessListResponseWithMessage[T any](items []T, message string) ApiRespons
 
 // SuccessPagedResponse creates a successful API response with pagination details.
 // It automatically wraps the items and metadata into a Page struct.
+// T is the type of items in the page.
 func SuccessPagedResponse[T any](items []T, totalCount int64, page, size int) ApiResponse[Page[T]] {
 	hasNext := totalCount > int64(page*size)
 
@@ -115,6 +120,15 @@ func SuccessPagedResponse[T any](items []T, totalCount int64, page, size int) Ap
 	}
 }
 
+// SimpleSuccessResponse creates a successful API response with a simple message.
+// T is set to 'any' as there is no data to return.
+func SimpleSuccessResponse(message string) ApiResponse[any] {
+	return ApiResponse[any]{
+		Success: true,
+		Message: message,
+	}
+}
+
 // ErrorResponse creates an error API response with a structured error.
 // T is set to 'any' as there is no data to return.
 func ErrorResponse(errorMessage, message string) ApiResponse[any] {
@@ -126,6 +140,7 @@ func ErrorResponse(errorMessage, message string) ApiResponse[any] {
 }
 
 // SimpleErrorResponse creates an error API response from a simple error message.
+// T is set to 'any' as there is no data to return.
 func SimpleErrorResponse(errorMessage string) ApiResponse[any] {
 	return ApiResponse[any]{
 		Success: false,