diff --git a/scripts/new-seam.sh b/scripts/new-seam.sh
new file mode 100755
index 0000000..9feb86f
--- /dev/null
+++ b/scripts/new-seam.sh
@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+# new-seam.sh — 闸1 脚手架:一条命令生成一个「接缝」骨架(支柱1:接缝即接口)。
+#
+# 让「对的写法」成为阻力最小的默认路径:外部依赖(原生/HTTP/子进程/存储/时钟/随机)
+# 藏在接口后、可注入、自带 Fake,从一开始就可测(支柱1 + 支柱5)。
+#
+# 用法:  bash scripts/new-seam.sh <PascalName> [lib 子目录(默认 seams)]
+# 例:    bash scripts/new-seam.sh GeoLocator services
+#        → client/lib/services/geo_locator.dart (接口+Impl+Fake+provider)
+#        → client/test/unit/geo_locator_seam_test.dart (ProviderScope override 桩)
+set -euo pipefail
+
+NAME="${1:-}"
+SUBDIR="${2:-seams}"
+[ -n "$NAME" ] || { echo "用法: bash scripts/new-seam.sh <PascalName> [lib子目录]" >&2; exit 2; }
+case "$NAME" in [A-Z]*) ;; *) echo "✗ 名字须 PascalCase(首字母大写),如 GeoLocator" >&2; exit 2;; esac
+
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+# PascalCase → snake_case
+SNAKE="$(python3 -c 'import re,sys;print(re.sub(r"(?<!^)(?=[A-Z])","_",sys.argv[1]).lower())' "$NAME")"
+LOWER="$(python3 -c 'print(sys.argv[1][0].lower()+sys.argv[1][1:])' "$NAME" 2>/dev/null || python3 -c 'import sys;s=sys.argv[1];print(s[0].lower()+s[1:])' "$NAME")"
+
+LIB="$ROOT/client/lib/$SUBDIR/$SNAKE.dart"
+TEST="$ROOT/client/test/unit/${SNAKE}_seam_test.dart"
+[ -e "$LIB" ]  && { echo "✗ 已存在: $LIB" >&2; exit 1; }
+[ -e "$TEST" ] && { echo "✗ 已存在: $TEST" >&2; exit 1; }
+mkdir -p "$(dirname "$LIB")"
+
+cat > "$LIB" <<EOF
+// $SNAKE.dart — $NAME 接缝(支柱1:接缝即接口)。
+//
+// 外部依赖藏在接口 [$NAME] 后:业务层只依赖接口、经 [${LOWER}Provider] 注入,
+// 禁止直接 new 真实现或调静态单例。测试用 [${NAME}Fake] 经 ProviderScope override 注入。
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+/// $NAME 接缝接口。TODO: 按需补方法(保持窄、可断言)。
+abstract class $NAME {
+  // TODO: e.g. Future<String> doThing();
+}
+
+/// 真实现:连真实外部依赖。
+class ${NAME}Impl implements $NAME {
+  // TODO: 实现接口方法。
+}
+
+/// 测试 Fake:无副作用、可控,供 ProviderScope override 注入(支柱1)。
+class ${NAME}Fake implements $NAME {
+  // TODO: 返回可控的假数据/记录调用。
+}
+
+/// 注入点:默认真实现;测试 override 为 ${NAME}Fake。
+final ${LOWER}Provider = Provider<$NAME>((ref) => ${NAME}Impl());
+EOF
+
+cat > "$TEST" <<EOF
+// ${SNAKE}_seam_test.dart — $NAME 接缝的 flow 测试桩(支柱1)。
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pangolin_vpn/$SUBDIR/$SNAKE.dart';
+
+void main() {
+  test('$NAME 经 ProviderScope override 注入 Fake', () {
+    final c = ProviderContainer(overrides: [
+      ${LOWER}Provider.overrideWithValue(${NAME}Fake()),
+    ]);
+    addTearDown(c.dispose);
+
+    expect(c.read(${LOWER}Provider), isA<${NAME}Fake>());
+    // TODO: 驱动接口方法、断言 Fake 行为(支柱5:可观测即可断言)。
+  });
+}
+EOF
+
+echo "✓ 已生成接缝骨架:"
+echo "    lib : client/lib/$SUBDIR/$SNAKE.dart  (接口 + Impl + Fake + provider)"
+echo "    test: client/test/unit/${SNAKE}_seam_test.dart  (override 注入 Fake)"
+echo "下一步:补接口方法 + Impl/Fake + 用例;flutter analyze && flutter test。"