diff --git a/.githooks/pre-commit b/.githooks/pre-commit
index f00e43c..175795f 100755
--- a/.githooks/pre-commit
+++ b/.githooks/pre-commit
@@ -28,6 +28,24 @@ run_check "可移植 SQL 扫描" bash ci/scan-portable-sql.sh
 
 if command -v node >/dev/null 2>&1; then
   run_check "codegen 漂移检查" bash ci/check-codegen-drift.sh
+
+  # ── ds-flow 闸(条件触发,秒级)──
+  staged="$(git diff --cached --name-only --diff-filter=ACM)"
+
+  # 原型校验:仅在动了 design/prototype/ 时跑(轻量,扫整个原型)。
+  if printf '%s\n' "$staged" | grep -q '^design/prototype/'; then
+    run_check "原型校验(check-ds)" node design/prototype/tools/check-ds.mjs
+  fi
+
+  # 跨端同源:动了原型 token/图标 或 web token 时跑(防漂移)。
+  if printf '%s\n' "$staged" | grep -qE '^(design/prototype/|web/(website|usercenter)/)'; then
+    run_check "跨端同源(check-l1-sync)" node tools/check-l1-sync.mjs
+  fi
+
+  # Flutter 颜色单源:只扫本次改动的 dart(--changed,快),动了 client/lib 才有意义。
+  if printf '%s\n' "$staged" | grep -q '^client/lib/.*\.dart$'; then
+    run_check "Flutter 颜色单源(check_ds_code)" bash -c 'cd client && node tool/check_ds_code.mjs --changed'
+  fi
 fi
 
 echo "[pre-commit] ✓ 本地闸通过(完整测试见 CI)"
diff --git a/ci/install-hooks.sh b/ci/install-hooks.sh
index 39d8478..2a96d9d 100755
--- a/ci/install-hooks.sh
+++ b/ci/install-hooks.sh
@@ -15,4 +15,5 @@ chmod +x .githooks/* 2>/dev/null || true
 
 echo "✓ 已启用 git hooks(core.hooksPath=.githooks)"
 echo "  pre-commit 将跑:红线词扫描 · 可移植 SQL 扫描 · codegen 漂移检查"
+echo "  + ds-flow 条件闸(动了原型/web/client 才跑):原型校验 · 跨端同源 · Flutter 颜色单源"
 echo "  卸载:git config --unset core.hooksPath"
diff --git a/docs/superpowers/plans/2026-07-07-frontend-ds-refactor.md b/docs/superpowers/plans/2026-07-07-frontend-ds-refactor.md
index 72dea0d..f839ba2 100644
--- a/docs/superpowers/plans/2026-07-07-frontend-ds-refactor.md
+++ b/docs/superpowers/plans/2026-07-07-frontend-ds-refactor.md
@@ -107,7 +107,7 @@ Flutter 已很干净（UI 层零裸 hex），只需收尾。
 - [x] 5.2 原型校验闸 `design/prototype/tools/check-ds.mjs`（照搬 jiu 12 道，按 pangolin 断点/主题裁剪）
 - [x] 5.3 CI 串起来（`.gitea/workflows/ci.yml` 增补）：
   原型校验 → 跨端同源 → 代码色单源 → codegen 零 diff（已有）→ 测试含 golden（已有，补 mobile+主题）
-- [ ] 5.4 启用 pre-commit：`ci/install-hooks.sh` 纳入 onboarding 文档 + CLAUDE.md，
+- [x] 5.4 启用 pre-commit：`ci/install-hooks.sh` 纳入 onboarding 文档 + CLAUDE.md，
   `.githooks/pre-commit` 增挂 `check-ds --changed`（只在动了 `design/prototype/` 时跑，轻量条件触发）
 - [ ] 5.5 fidelity 像素闸（本地体检，不进 CI）：`tools/screens.mjs` 屏注册表 + `tools/fidelity.mjs`
   （原型 Chromium 截图 vs Flutter golden pixelmatch，逐屏阈值=实测残差+2pp，两边统一注入 CJK 字体）