diff --git a/src/shared/lib/cache/invalidate.test.ts b/src/shared/lib/cache/invalidate.test.ts
new file mode 100644
index 0000000..018600e
--- /dev/null
+++ b/src/shared/lib/cache/invalidate.test.ts
@@ -0,0 +1,70 @@
+import { describe, it, expect, vi, beforeEach } from "vitest"
+
+// vi.mock 工厂被提升到文件顶部，引用的变量必须用 vi.hoisted 提升，否则进入 TDZ
+const { mockStore } = vi.hoisted(() => ({
+  mockStore: {
+    getOrSet: vi.fn(),
+    invalidateTags: vi.fn(),
+  },
+}))
+vi.mock("./store-factory", () => ({
+  getCacheStore: vi.fn().mockResolvedValue(mockStore),
+}))
+
+const mockRevalidateTag = vi.fn()
+const mockRevalidatePath = vi.fn()
+vi.mock("next/cache", () => ({
+  revalidateTag: (...args: unknown[]) => mockRevalidateTag(...args),
+  revalidatePath: (...args: unknown[]) => mockRevalidatePath(...args),
+}))
+
+import { invalidateFor } from "./invalidate"
+import { getCacheStore } from "./store-factory"
+
+describe("invalidateFor", () => {
+  beforeEach(() => {
+    vi.clearAllMocks()
+    // vitest 配置 mockReset:true 会在每个测试前重置 mockResolvedValue，
+    // 此处需重新绑定 getCacheStore 的返回值
+    vi.mocked(getCacheStore).mockResolvedValue(mockStore)
+  })
+
+  it("三步编排：store.invalidateTags → revalidateTag → revalidatePath", async () => {
+    await invalidateFor("classes.update", { id: "cls_123" })
+
+    // 1. store.invalidateTags
+    expect(mockStore.invalidateTags).toHaveBeenCalledWith([
+      "classes",
+      "classes:detail",
+      "classes:detail:cls_123",
+    ])
+
+    // 2. revalidateTag × 3（Next.js 16 起强制要求传入 cache life profile）
+    expect(mockRevalidateTag).toHaveBeenCalledTimes(3)
+    expect(mockRevalidateTag).toHaveBeenCalledWith("classes", "default")
+    expect(mockRevalidateTag).toHaveBeenCalledWith("classes:detail", "default")
+    expect(mockRevalidateTag).toHaveBeenCalledWith("classes:detail:cls_123", "default")
+
+    // 3. revalidatePath × 2
+    expect(mockRevalidatePath).toHaveBeenCalledTimes(2)
+    expect(mockRevalidatePath).toHaveBeenCalledWith("/teacher/classes/my")
+    expect(mockRevalidatePath).toHaveBeenCalledWith("/admin/classes")
+  })
+
+  it("未知 actionId 抛错", async () => {
+    await expect(invalidateFor("unknown.action")).rejects.toThrow(
+      "[cache] Unknown actionId: unknown.action",
+    )
+  })
+
+  it("params 缺失时保留占位符（不抛错）", async () => {
+    await invalidateFor("classes.update", {})
+    expect(mockRevalidateTag).toHaveBeenCalledWith("classes:detail:{id}", "default")
+    expect(mockRevalidatePath).toHaveBeenCalledWith("/teacher/classes/my")
+  })
+
+  it("paths 含占位符时填充", async () => {
+    await invalidateFor("classes.invitation.create", { classId: "cls_1" })
+    expect(mockRevalidatePath).toHaveBeenCalledWith("/teacher/classes/my/cls_1")
+  })
+})
diff --git a/src/shared/lib/cache/invalidate.ts b/src/shared/lib/cache/invalidate.ts
new file mode 100644
index 0000000..80c7ef4
--- /dev/null
+++ b/src/shared/lib/cache/invalidate.ts
@@ -0,0 +1,45 @@
+import "server-only"
+
+import { revalidatePath, revalidateTag } from "next/cache"
+
+import { INVALIDATION_MAP, fillTemplate } from "./invalidation-map"
+import { getCacheStore } from "./store-factory"
+
+/**
+ * 由 Server Action 在写操作成功后调用，集中编排缓存失效。
+ *
+ * 三件事：
+ * 1. cacheStore.invalidateTags（服务端数据缓存失效）
+ * 2. revalidateTag × N（Next.js fetch 缓存 + unstable_cache 失效）
+ * 3. revalidatePath × N（RSC 静态缓存失效）
+ *
+ * @param actionId 形如 "classes.update"，对应 INVALIDATION_MAP 中的 key
+ * @param params 模板参数，如 { id: "cls_123" }，用于填充 {id} 占位符
+ */
+export async function invalidateFor(
+  actionId: string,
+  params: Record<string, string> = {},
+): Promise<void> {
+  const rule = (INVALIDATION_MAP as Record<string, { tags: readonly string[]; queryKeys: readonly (readonly (string | number)[])[]; paths: readonly string[] }>)[actionId]
+  if (!rule) {
+    throw new Error(
+      `[cache] Unknown actionId: ${actionId}. Update INVALIDATION_MAP.`,
+    )
+  }
+
+  // 1. 服务端数据缓存失效（Redis / 内存）
+  const resolvedTags = rule.tags.map((t) => fillTemplate(t, params))
+  const store = await getCacheStore()
+  await store.invalidateTags(resolvedTags)
+
+  // 2. Next.js fetch 缓存 + unstable_cache 失效
+  // Next.js 16 起 revalidateTag 强制要求传入 cache life profile
+  for (const tag of resolvedTags) {
+    revalidateTag(tag, "default")
+  }
+
+  // 3. 路径级 RSC 缓存失效
+  for (const path of rule.paths) {
+    revalidatePath(fillTemplate(path, params))
+  }
+}