diff --git a/back/src/main/java/com/back/domain/mentoring/reservation/entity/Reservation.java b/back/src/main/java/com/back/domain/mentoring/reservation/entity/Reservation.java
index 67fbdfd9..d5403661 100644
--- a/back/src/main/java/com/back/domain/mentoring/reservation/entity/Reservation.java
+++ b/back/src/main/java/com/back/domain/mentoring/reservation/entity/Reservation.java
@@ -7,6 +7,7 @@
 import com.back.domain.mentoring.reservation.constant.ReservationStatus;
 import com.back.domain.mentoring.reservation.error.ReservationErrorCode;
 import com.back.domain.mentoring.slot.entity.MentorSlot;
+import com.back.global.app.AppConfig;
 import com.back.global.exception.ServiceException;
 import com.back.global.jpa.BaseEntity;
 import jakarta.persistence.*;
@@ -132,6 +133,10 @@ private void ensureCanComplete() {
         if(!this.status.canComplete()) {
             throw new ServiceException(ReservationErrorCode.CANNOT_COMPLETE);
         }
+        // 개발·테스트 환경에서는 검증 스킵 (Swagger 테스트 허용)
+        if (AppConfig.isDev() || AppConfig.isTest()) {
+            return;
+        }
         // 시작 이후 완료 가능 (조기 종료 허용)
         if (!mentorSlot.isPast()) {
             throw new ServiceException(ReservationErrorCode.MENTORING_NOT_STARTED);