diff --git a/package.json b/package.json
index 9279564..d63b0e7 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,9 @@
     "phase-script": "tsx src/cli/phase-demo.ts --script --auto",
     "web": "tsx src/server/web-server.ts",
     "web:watch": "tsx watch --clear-screen=false --include \"./src/**/*.ts\" --include \"./skills/**\" src/server/web-server.ts",
-    "electron": "electron ."
+    "electron": "electron .",
+    "libraries:restore": "tsx src/cli/restore-library-seeds.ts",
+    "libraries:export": "tsx src/cli/restore-library-seeds.ts --export"
   },
   "devDependencies": {
     "@types/node": "^22.10.0",
diff --git a/seeds/libraries/README.md b/seeds/libraries/README.md
new file mode 100644
index 0000000..5d37332
--- /dev/null
+++ b/seeds/libraries/README.md
@@ -0,0 +1,18 @@
+# 库种子（git 备份）
+
+本目录保存偏好库、文风库的可提交种子，便于数据丢失后恢复。
+
+- `preferences.json` / `style-packs.json`：与用户目录中同名文件同形（`version: 1` + `entries`）。
+- 运行时库仍在用户数据目录；本目录只作仓库备份与恢复源。
+
+恢复（合并写入，不覆盖已有同 id 正文）：
+
+```bash
+npx tsx src/cli/restore-library-seeds.ts
+```
+
+导出当前用户库到本目录（覆盖种子文件，便于更新 git 备份）：
+
+```bash
+npx tsx src/cli/restore-library-seeds.ts --export
+```
diff --git a/seeds/libraries/preferences.json b/seeds/libraries/preferences.json
new file mode 100644
index 0000000..d114312
--- /dev/null
+++ b/seeds/libraries/preferences.json
@@ -0,0 +1,19 @@
+{
+  "version": 1,
+  "entries": [
+    {
+      "id": "starter-no-user-ntr-victim",
+      "content": "用户代入角色不做被 NTR 的一方（恋人/伴侣与第三者发生性或背叛性感情，用户角色受害或被欺瞒）。用户角色 NTR 别人不受此限。",
+      "status": "active",
+      "createdAt": "2026-01-01T00:00:00.000Z",
+      "updatedAt": "2026-01-01T00:00:00.000Z"
+    },
+    {
+      "id": "starter-default-male-hetero-yuri-ok",
+      "content": "禁止对男同性恋内容的直接描写，减少或忽略间接描写。默认用户角色为男性，情爱与性吸引朝向女性；女同性恋内容可写。",
+      "status": "active",
+      "createdAt": "2026-01-01T00:00:00.000Z",
+      "updatedAt": "2026-01-01T00:00:00.000Z"
+    }
+  ]
+}
diff --git a/seeds/libraries/style-packs.json b/seeds/libraries/style-packs.json
new file mode 100644
index 0000000..7f19696
--- /dev/null
+++ b/seeds/libraries/style-packs.json
@@ -0,0 +1,4 @@
+{
+  "version": 1,
+  "entries": []
+}
diff --git a/src/cli/restore-library-seeds.ts b/src/cli/restore-library-seeds.ts
new file mode 100644
index 0000000..6828ea2
--- /dev/null
+++ b/src/cli/restore-library-seeds.ts
@@ -0,0 +1,24 @@
+/**
+ * 从仓库 seeds/libraries 恢复偏好库/文风库，或导出当前库到种子目录。
+ *
+ *   npx tsx src/cli/restore-library-seeds.ts
+ *   npx tsx src/cli/restore-library-seeds.ts --export
+ */
+import {
+  exportLibrarySeedsToRepo,
+  restoreLibrarySeedsFromRepo,
+} from "../libraries/seed-backup.js";
+
+const exportMode = process.argv.includes("--export");
+
+if (exportMode) {
+  const result = exportLibrarySeedsToRepo();
+  console.log(
+    `已导出种子：preferences=${result.preferences}  style-packs=${result.stylePacks}`,
+  );
+} else {
+  const result = restoreLibrarySeedsFromRepo();
+  console.log(
+    `已合并恢复：preferences +${result.preferencesAdded}  style-packs +${result.stylePacksAdded}`,
+  );
+}
diff --git a/src/libraries/seed-backup.ts b/src/libraries/seed-backup.ts
new file mode 100644
index 0000000..a9a896c
--- /dev/null
+++ b/src/libraries/seed-backup.ts
@@ -0,0 +1,113 @@
+/**
+ * 仓库内库种子 ↔ 用户数据目录库文件的导入/导出。
+ * 导入：缺 id 才补，不覆盖用户已改同 id 正文。
+ */
+import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import {
+  loadPreferenceStore,
+  savePreferenceStore,
+  type PreferenceStoreFile,
+} from "../preference/store.js";
+import {
+  loadStylePackStore,
+  saveStylePackStore,
+  type StylePackStoreFile,
+} from "../style-pack/store.js";
+
+const ROOT = path.resolve(
+  path.dirname(fileURLToPath(import.meta.url)),
+  "../..",
+);
+
+export const LIBRARY_SEED_DIR = path.join(ROOT, "seeds", "libraries");
+
+function readJsonFile(file: string): unknown {
+  return JSON.parse(readFileSync(file, "utf8")) as unknown;
+}
+
+function isPreferenceStore(raw: unknown): raw is PreferenceStoreFile {
+  return (
+    !!raw &&
+    typeof raw === "object" &&
+    !Array.isArray(raw) &&
+    (raw as PreferenceStoreFile).version === 1 &&
+    Array.isArray((raw as PreferenceStoreFile).entries)
+  );
+}
+
+function isStylePackStore(raw: unknown): raw is StylePackStoreFile {
+  return (
+    !!raw &&
+    typeof raw === "object" &&
+    !Array.isArray(raw) &&
+    (raw as StylePackStoreFile).version === 1 &&
+    Array.isArray((raw as StylePackStoreFile).entries)
+  );
+}
+
+export function restoreLibrarySeedsFromRepo(): {
+  preferencesAdded: number;
+  stylePacksAdded: number;
+} {
+  const prefPath = path.join(LIBRARY_SEED_DIR, "preferences.json");
+  const stylePath = path.join(LIBRARY_SEED_DIR, "style-packs.json");
+  let preferencesAdded = 0;
+  let stylePacksAdded = 0;
+
+  if (existsSync(prefPath)) {
+    const seed = readJsonFile(prefPath);
+    if (isPreferenceStore(seed)) {
+      const store = loadPreferenceStore();
+      const have = new Set(store.entries.map((entry) => entry.id));
+      for (const entry of seed.entries) {
+        if (!entry.id || have.has(entry.id)) continue;
+        store.entries.push(entry);
+        have.add(entry.id);
+        preferencesAdded += 1;
+      }
+      if (preferencesAdded) savePreferenceStore(store);
+    }
+  }
+
+  if (existsSync(stylePath)) {
+    const seed = readJsonFile(stylePath);
+    if (isStylePackStore(seed)) {
+      const store = loadStylePackStore();
+      const have = new Set(store.entries.map((entry) => entry.id));
+      for (const entry of seed.entries) {
+        if (!entry.id || have.has(entry.id)) continue;
+        store.entries.push(entry);
+        have.add(entry.id);
+        stylePacksAdded += 1;
+      }
+      if (stylePacksAdded) saveStylePackStore(store);
+    }
+  }
+
+  return { preferencesAdded, stylePacksAdded };
+}
+
+export function exportLibrarySeedsToRepo(): {
+  preferences: number;
+  stylePacks: number;
+} {
+  mkdirSync(LIBRARY_SEED_DIR, { recursive: true });
+  const preferences = loadPreferenceStore();
+  const stylePacks = loadStylePackStore();
+  writeFileSync(
+    path.join(LIBRARY_SEED_DIR, "preferences.json"),
+    `${JSON.stringify(preferences, null, 2)}\n`,
+    "utf8",
+  );
+  writeFileSync(
+    path.join(LIBRARY_SEED_DIR, "style-packs.json"),
+    `${JSON.stringify(stylePacks, null, 2)}\n`,
+    "utf8",
+  );
+  return {
+    preferences: preferences.entries.length,
+    stylePacks: stylePacks.entries.length,
+  };
+}
diff --git a/tests/library-seed-backup.test.ts b/tests/library-seed-backup.test.ts
new file mode 100644
index 0000000..1ad3138
--- /dev/null
+++ b/tests/library-seed-backup.test.ts
@@ -0,0 +1,71 @@
+import { mkdtempSync, readFileSync, rmSync } from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import {
+  LIBRARY_SEED_DIR,
+  restoreLibrarySeedsFromRepo,
+} from "../src/libraries/seed-backup.js";
+import {
+  listActivePreferences,
+  loadPreferenceStore,
+  savePreferenceStore,
+} from "../src/preference/store.js";
+
+const originalUserData = process.env.WRITING_AGENT_DATA_DIR;
+
+describe("library seed backup", () => {
+  let tempDir = "";
+
+  beforeEach(() => {
+    tempDir = mkdtempSync(path.join(os.tmpdir(), "wa-lib-seed-"));
+    process.env.WRITING_AGENT_DATA_DIR = tempDir;
+  });
+
+  afterEach(() => {
+    if (originalUserData === undefined) {
+      delete process.env.WRITING_AGENT_DATA_DIR;
+    } else {
+      process.env.WRITING_AGENT_DATA_DIR = originalUserData;
+    }
+    rmSync(tempDir, { recursive: true, force: true });
+  });
+
+  it("restores missing preference ids from repo seeds without overwriting", () => {
+    savePreferenceStore({
+      version: 1,
+      entries: [
+        {
+          id: "starter-no-user-ntr-victim",
+          content: "用户已改过的正文",
+          status: "active",
+          createdAt: "2026-01-01T00:00:00.000Z",
+          updatedAt: "2026-01-01T00:00:00.000Z",
+        },
+      ],
+    });
+
+    const result = restoreLibrarySeedsFromRepo();
+    expect(result.preferencesAdded).toBeGreaterThanOrEqual(1);
+
+    const store = loadPreferenceStore();
+    const kept = store.entries.find((e) => e.id === "starter-no-user-ntr-victim");
+    expect(kept?.content).toBe("用户已改过的正文");
+    expect(
+      store.entries.some((e) => e.id === "starter-default-male-hetero-yuri-ok"),
+    ).toBe(true);
+    expect(listActivePreferences().length).toBeGreaterThanOrEqual(2);
+  });
+
+  it("keeps seed files in the repository libraries directory", () => {
+    const prefSeed = path.join(LIBRARY_SEED_DIR, "preferences.json");
+    const raw = JSON.parse(readFileSync(prefSeed, "utf8")) as {
+      version: number;
+      entries: Array<{ id: string }>;
+    };
+    expect(raw.version).toBe(1);
+    expect(raw.entries.some((e) => e.id === "starter-no-user-ntr-victim")).toBe(
+      true,
+    );
+  });
+});
\ No newline at end of file