diff --git a/src/main/java/com/sofa/linkiving/domain/chat/ai/MockAnswerClient.java b/src/main/java/com/sofa/linkiving/domain/chat/ai/MockAnswerClient.java
index 6b27dc0c..9d60735d 100644
--- a/src/main/java/com/sofa/linkiving/domain/chat/ai/MockAnswerClient.java
+++ b/src/main/java/com/sofa/linkiving/domain/chat/ai/MockAnswerClient.java
@@ -8,18 +8,12 @@
 import com.sofa.linkiving.domain.chat.dto.request.RagAnswerReq;
 import com.sofa.linkiving.domain.chat.dto.response.RagAnswerRes;
 
-import lombok.extern.slf4j.Slf4j;
-
-@Slf4j
 @Component
 @Profile("test")
 public class MockAnswerClient implements AnswerClient {
 
 	@Override
 	public RagAnswerRes generateAnswer(RagAnswerReq request) {
-		log.info("[Mock AI Request] User: {}, Question: {}, Mode: {}, HistoryCnt: {}",
-			request.userId(), request.question(), request.mode(), request.history().size());
-
 		return new RagAnswerRes(
 			"임시 답변",
 			List.of("3", "4"),
diff --git a/src/main/java/com/sofa/linkiving/domain/chat/facade/ChatFacade.java b/src/main/java/com/sofa/linkiving/domain/chat/facade/ChatFacade.java
index d95b4a1c..ea81a5da 100644
--- a/src/main/java/com/sofa/linkiving/domain/chat/facade/ChatFacade.java
+++ b/src/main/java/com/sofa/linkiving/domain/chat/facade/ChatFacade.java
@@ -78,9 +78,9 @@ public void generateAnswer(Long chatId, Member member, String message) {
 			if (task.isCancelled() || ex != null) {
 
 				if (ex != null) {
-					log.error("AI 답변 생성 중 오류 발생 - chatId: {}, error: {}", chatId, ex.getMessage(), ex);
+					log.error("AI 답변 생성 중 오류 발생 - chatId={}", chatId, ex);
 				} else {
-					log.info("AI 답변 생성 작업 취소됨 - chatId: {}", chatId);
+					log.info("AI 답변 생성 작업 취소됨 - chatId={}", chatId);
 				}
 
 				sendNotification(chatId, member, AnswerRes.error(chatId, message));
@@ -92,7 +92,7 @@ public void generateAnswer(Long chatId, Member member, String message) {
 				return;
 			}
 
-			log.error("AI 답변 생성 결과가 null 입니다 - chatId: {}", chatId);
+			log.error("AI 답변 생성 결과가 null 입니다 - chatId={}", chatId);
 			sendNotification(chatId, member, AnswerRes.error(chatId, message));
 		});
 	}
diff --git a/src/main/java/com/sofa/linkiving/domain/link/event/SummaryStatusEventListener.java b/src/main/java/com/sofa/linkiving/domain/link/event/SummaryStatusEventListener.java
index 5606d120..dc55ac74 100644
--- a/src/main/java/com/sofa/linkiving/domain/link/event/SummaryStatusEventListener.java
+++ b/src/main/java/com/sofa/linkiving/domain/link/event/SummaryStatusEventListener.java
@@ -22,7 +22,8 @@ public void handleSummaryStatusEvent(SummaryStatusEvent event) {
 			"/queue/summary",
 			event.response()
 		);
-		log.info("요약 상태 웹소켓 푸시 완료 - 이메일: {}, 상태: {}, 링크ID: {}",
-			event.email(), event.response().status(), event.response().linkId());
+
+		log.debug("요약 상태 웹소켓 푸시 완료 - status={}, linkId={}",
+			event.response().status(), event.response().linkId());
 	}
 }
diff --git a/src/main/java/com/sofa/linkiving/domain/link/service/LinkService.java b/src/main/java/com/sofa/linkiving/domain/link/service/LinkService.java
index 5aa41503..fb34edba 100644
--- a/src/main/java/com/sofa/linkiving/domain/link/service/LinkService.java
+++ b/src/main/java/com/sofa/linkiving/domain/link/service/LinkService.java
@@ -29,7 +29,7 @@ public Link createLink(Member member, String url, String title, String memo, Str
 		}
 
 		Link link = linkCommandService.saveLink(member, url, title, memo, imageUrl);
-		log.info("Link created - id: {}, memberId: {}, url: {}", link.getId(), member.getId(), url);
+		log.info("Link created - id={}, memberId={}", link.getId(), member.getId());
 
 		return link;
 	}
@@ -38,7 +38,7 @@ public Link updateLink(Long linkId, Member member, String title, String memo, St
 		Link link = linkQueryService.findById(linkId, member);
 		Link updatedLink = linkCommandService.updateLink(link, title, memo, imageUrl);
 
-		log.info("Link updated - id: {}, memberId: {}", linkId, member.getId());
+		log.debug("Link updated - id={}, memberId={}", linkId, member.getId());
 
 		return updatedLink;
 	}
@@ -47,7 +47,7 @@ public Link updateTitle(Long linkId, Member member, String title) {
 		Link link = linkQueryService.findById(linkId, member);
 		Link updatedLink = linkCommandService.updateLink(link, title, link.getMemo(), link.getImageUrl());
 
-		log.info("Link title updated - id: {}, memberId: {}", linkId, member.getId());
+		log.debug("Link title updated - id={}, memberId={}", linkId, member.getId());
 
 		return updatedLink;
 	}
@@ -56,7 +56,7 @@ public Link updateMemo(Long linkId, Member member, String memo) {
 		Link link = linkQueryService.findById(linkId, member);
 		Link updatedLink = linkCommandService.updateLink(link, link.getTitle(), memo, link.getImageUrl());
 
-		log.info("Link memo updated - id: {}, memberId: {}", linkId, member.getId());
+		log.debug("Link memo updated - id={}, memberId={}", linkId, member.getId());
 
 		return updatedLink;
 	}
@@ -65,7 +65,7 @@ public void deleteLink(Long linkId, Member member) {
 		Link link = linkQueryService.findById(linkId, member);
 		linkCommandService.deleteLink(link);
 
-		log.info("Link soft deleted - id: {}, memberId: {}", linkId, member.getId());
+		log.info("Link soft deleted - id={}, memberId={}", linkId, member.getId());
 	}
 
 	public Link getLink(Long linkId) {
diff --git a/src/main/java/com/sofa/linkiving/domain/link/util/OgTagCrawler.java b/src/main/java/com/sofa/linkiving/domain/link/util/OgTagCrawler.java
index 474521c1..96f24c85 100644
--- a/src/main/java/com/sofa/linkiving/domain/link/util/OgTagCrawler.java
+++ b/src/main/java/com/sofa/linkiving/domain/link/util/OgTagCrawler.java
@@ -22,7 +22,6 @@ public OgTagCrawler(UrlValidator urlValidator) {
 	}
 
 	public OgTagDto crawl(String url) {
-		// SSRF 방어: URL 안전성 검증
 		urlValidator.validateSafeUrl(url);
 
 		try {
@@ -39,7 +38,7 @@ public OgTagDto crawl(String url) {
 				.build();
 
 		} catch (IOException e) {
-			log.warn("OG 태그 크롤링 실패: {}", url, e);
+			log.warn("OG 태그 크롤링 실패 - url={}, reason={}", url, e.getMessage());
 			return OgTagDto.EMPTY;
 		}
 	}
diff --git a/src/main/java/com/sofa/linkiving/domain/link/worker/SummaryQueue.java b/src/main/java/com/sofa/linkiving/domain/link/worker/SummaryQueue.java
index 510bf396..bd78dfd1 100644
--- a/src/main/java/com/sofa/linkiving/domain/link/worker/SummaryQueue.java
+++ b/src/main/java/com/sofa/linkiving/domain/link/worker/SummaryQueue.java
@@ -19,7 +19,7 @@ public class SummaryQueue {
 	 */
 	public void addToQueue(Long linkId) {
 		summaryQueue.offer(linkId);
-		log.info("Link added to summary queue - linkId: {}", linkId);
+		log.debug("Link added to summary queue - linkId={}", linkId);
 	}
 
 	/**
diff --git a/src/main/java/com/sofa/linkiving/infra/s3/S3ImageUploader.java b/src/main/java/com/sofa/linkiving/infra/s3/S3ImageUploader.java
index d49b4c5b..526208a2 100644
--- a/src/main/java/com/sofa/linkiving/infra/s3/S3ImageUploader.java
+++ b/src/main/java/com/sofa/linkiving/infra/s3/S3ImageUploader.java
@@ -80,7 +80,8 @@ private String uploadNewImage(String originalUrl) {
 			log.warn("Invalid image URL skipping upload: {}", originalUrl);
 			return normalizedDefaultImageUrl();
 		} catch (Exception e) {
-			log.error("S3 upload failed for URL: {}", originalUrl, e);
+			log.warn("S3 upload failed, fallback to default image - url={}, reason={}",
+				originalUrl, e.getMessage());
 			return normalizedDefaultImageUrl();
 		}
 	}
@@ -92,7 +93,7 @@ public Optional<String> resolveStoredUrl(String originalUrl) {
 		try {
 			String s3Key = generateUniqueKeyFromUrl(originalUrl);
 			if (s3Template.objectExists(bucketName, s3Key)) {
-				log.info("Image already exists (Cache Hit): {} -> {}", originalUrl, s3Key);
+				log.debug("Image cache hit - s3Key={}", s3Key);
 				return Optional.of(buildS3Url(s3Key));
 			}
 		} catch (Exception e) {
diff --git a/src/main/java/com/sofa/linkiving/security/auth/handler/OAuth2FailureHandler.java b/src/main/java/com/sofa/linkiving/security/auth/handler/OAuth2FailureHandler.java
index ba77ecd6..5d7ce426 100644
--- a/src/main/java/com/sofa/linkiving/security/auth/handler/OAuth2FailureHandler.java
+++ b/src/main/java/com/sofa/linkiving/security/auth/handler/OAuth2FailureHandler.java
@@ -17,7 +17,9 @@
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 
+@Slf4j
 @Component
 @RequiredArgsConstructor
 public class OAuth2FailureHandler extends SimpleUrlAuthenticationFailureHandler {
@@ -39,6 +41,10 @@ public void onAuthenticationFailure(HttpServletRequest request, HttpServletRespo
 			errorCode = determineAuthErrorCode(error.getErrorCode());
 		}
 
+		if (errorCode.getStatus().is5xxServerError()) {
+			log.warn("OAuth 로그인 실패(서버성 오류) - code={}", errorCode.getCode());
+		}
+
 		String targetUrl = UriComponentsBuilder.fromUriString(oauth2Properties.failureRedirectUrl())
 			.queryParam("code", errorCode.getCode())
 			.build().toUriString();
diff --git a/src/main/java/com/sofa/linkiving/security/jwt/JwtTokenProvider.java b/src/main/java/com/sofa/linkiving/security/jwt/JwtTokenProvider.java
index 68daff6d..0d109775 100644
--- a/src/main/java/com/sofa/linkiving/security/jwt/JwtTokenProvider.java
+++ b/src/main/java/com/sofa/linkiving/security/jwt/JwtTokenProvider.java
@@ -110,7 +110,6 @@ public String resolveToken(HttpServletRequest request) {
 			return cookie.getValue();
 		}
 
-		log.warn("Token not found (missing in both header and cookie)");
 		return null;
 	}
 
diff --git a/src/main/java/com/sofa/linkiving/security/jwt/error/JwtErrorCode.java b/src/main/java/com/sofa/linkiving/security/jwt/error/JwtErrorCode.java
index e97bd884..b33ac0fc 100644
--- a/src/main/java/com/sofa/linkiving/security/jwt/error/JwtErrorCode.java
+++ b/src/main/java/com/sofa/linkiving/security/jwt/error/JwtErrorCode.java
@@ -16,7 +16,7 @@ public enum JwtErrorCode implements ErrorCode {
 	UNSUPPORTED_JWT_TOKEN(HttpStatus.UNAUTHORIZED, "J-002", "지원하지 않는 JWT 토큰입니다."),
 	EMPTY_TOKEN(HttpStatus.UNAUTHORIZED, "J-003", "토큰이 필요합니다."),
 	CANNOT_REFRESH(HttpStatus.UNAUTHORIZED, "J-004", "토큰을 갱신할 수 없습니다."),
-	INVALID_REFRESH(HttpStatus.BAD_REQUEST, "J-004", "refresh 토큰이 아닙니다.");
+	INVALID_REFRESH(HttpStatus.BAD_REQUEST, "J-005", "refresh 토큰이 아닙니다.");
 
 	private final HttpStatus status;
 	private final String code;