diff --git a/src/lib/queryKeys.ts b/src/lib/queryKeys.ts
new file mode 100644
index 0000000..cc25c56
--- /dev/null
+++ b/src/lib/queryKeys.ts
@@ -0,0 +1,18 @@
+export const queryKeys = {
+  boards: {
+    all: ["boards"] as const,
+  },
+  posts: {
+    list: (params: { page: number; pageSize: number; boardId?: string; q?: string }) =>
+      ["posts", "list", params] as const,
+    detail: (id: string) => ["posts", "detail", id] as const,
+  },
+  comments: {
+    list: (postId: string) => ["comments", "list", postId] as const,
+  },
+  auth: {
+    permissions: ["auth", "permissions"] as const,
+  },
+};
+
+
diff --git a/todolist.txt b/todolist.txt
index 570a9c3..fdd3b61 100644
--- a/todolist.txt
+++ b/todolist.txt
@@ -23,7 +23,7 @@
 [상태관리/데이터]
 4.1 React Query 설치 및 Provider 구성 o
 4.2 공통 fetcher/에러 형식/재시도·백오프 설정 o
-4.3 캐시 키/무효화 전략 수립 및 적용
+4.3 캐시 키/무효화 전략 수립 및 적용 o
 4.4 낙관적 업데이트 패턴 적용(작성/수정)
 
 [공통/레이아웃]