diff --git a/game-studio/.agent b/game-studio/.agent
index 0568ed90..fce0bfe3 100644
--- a/game-studio/.agent
+++ b/game-studio/.agent
@@ -37,7 +37,7 @@ game-studio/
 - [x] **4 个 contractGaps 已由契约 owner 在 Wave3 补齐**：publish 门禁明细(GAP-1 ProjectPublishRespVO) / GamePackage 取包端点(GAP-2 runtime manifestUrl) / ShareMeta versionId(GAP-3) / 遥测 snake→camel(GAP-4)。
 - [x] **已 git 提交**（前端脊柱 `67ad750`）。
 - [ ] **真实联调（staging：切 `VITE_API_BASE_URL` 接 mini-desktop 后端，5 条链路端到端走查）** ← 当前最高价值待办，见总账 §5「联调」。
-- [ ] 安全测试补：postMessage 双校验"拒非法 origin/schema"独立验证。
+- [x] 安全测试补：postMessage 双校验"拒非法 origin/schema"独立验证（`src/host/bridge.security.test.mts`，12 例覆盖全 RejectReason + 空白名单默认拒 + dispose 失活；跑：`node --import tsx --test src/host/bridge.security.test.mts`）。
 - [ ] 可选：卡片点击热区扩大到整卡；mock 假数据品牌文案；srcdoc 生产收紧 origin。
 
 ## 验证门铁律（本仓特有，勿踩）
diff --git a/game-studio/src/host/bridge.security.test.mts b/game-studio/src/host/bridge.security.test.mts
new file mode 100644
index 00000000..809414ae
--- /dev/null
+++ b/game-studio/src/host/bridge.security.test.mts
@@ -0,0 +1,143 @@
+/**
+ * bridge.security.test.mts —— 宿主 postMessage 桥【双校验安全红线】独立验证
+ * （game-studio/.agent TODO「postMessage 双校验"拒非法 origin/schema"独立验证」；
+ *   security-and-reliability §1.1 沙箱安全红线：不可信边界先校 origin 再校 schema，任一不过即丢弃绝不分发）。
+ *
+ * 运行：node --import tsx --test src/host/bridge.security.test.mts
+ *   （.mts 不在 tsconfig.app include[src/**\/*.ts] 内,故不入 vue-tsc -b 构建,仅本测试单独跑——同 game-runtime node --test 范式）
+ *
+ * 验证手法：桩 window 捕获 message handler，合成 {origin,data} 事件直灌（无需 jsdom/真浏览器），
+ *   断言「合法→分发不拒 / 非法 origin|schema→拒且不分发」。覆盖全部 RejectReason + 空白名单默认拒 + dispose 失活。
+ */
+import test from 'node:test';
+import assert from 'node:assert/strict';
+
+// —— 桩 window：必须在 new HostBridge 前置好（构造期 addEventListener；bridge 模块级不碰 window）——
+let captured: ((ev: { origin: string; data: unknown }) => void) | null = null;
+(globalThis as { window?: unknown }).window = {
+  addEventListener: (type: string, h: (ev: { origin: string; data: unknown }) => void) => {
+    if (type === 'message') captured = h;
+  },
+  removeEventListener: () => {},
+};
+
+const { HostBridge } = await import('./bridge.ts');
+const { SDK_CHANNEL } = await import('./contract.ts');
+
+const ALLOWED = 'https://play.example.com';
+
+/** 造一座桥 + 间谍收集 onMessage/onReject + 合成事件触发器 */
+function setup(allowedOrigins: string[] = [ALLOWED]) {
+  captured = null;
+  const delivered: unknown[] = [];
+  const rejected: { reason: string; origin: string }[] = [];
+  const bridge = new HostBridge({
+    targetWindow: null,
+    allowedOrigins,
+    onMessage: (e) => delivered.push(e),
+    onReject: (reason, _raw, origin) => rejected.push({ reason, origin }),
+  });
+  return {
+    bridge,
+    delivered,
+    rejected,
+    fire: (ev: { origin: string; data: unknown }) => captured!(ev),
+  };
+}
+
+/** 合法信封（可覆写字段造非法用例） */
+function envelope(over: Record<string, unknown> = {}): Record<string, unknown> {
+  return {
+    channel: SDK_CHANNEL,
+    type: 'lifecycle',
+    direction: 'game_to_host',
+    traceId: 't-1',
+    payload: { event: 'game_loaded' },
+    ...over,
+  };
+}
+
+test('合法 origin + 合法信封 → 分发且不拒', () => {
+  const { fire, delivered, rejected } = setup();
+  fire({ origin: ALLOWED, data: envelope() });
+  assert.equal(delivered.length, 1, '合法消息应分发');
+  assert.equal(rejected.length, 0, '合法消息不应被拒');
+});
+
+test('非法 origin → 拒 origin_not_allowed 且不分发（第一道）', () => {
+  const { fire, delivered, rejected } = setup();
+  fire({ origin: 'https://evil.example.com', data: envelope() });
+  assert.equal(delivered.length, 0, '非法 origin 绝不分发');
+  assert.equal(rejected[0]?.reason, 'origin_not_allowed');
+});
+
+test('空白名单 → 默认拒所有 origin（安全默认拒绝）', () => {
+  const { fire, delivered, rejected } = setup([]);
+  fire({ origin: ALLOWED, data: envelope() });
+  assert.equal(delivered.length, 0);
+  assert.equal(rejected[0]?.reason, 'origin_not_allowed');
+});
+
+test('合法 origin + 非对象 data → 拒 not_object', () => {
+  const { fire, delivered, rejected } = setup();
+  fire({ origin: ALLOWED, data: 'definitely-not-an-object' });
+  assert.equal(delivered.length, 0);
+  assert.equal(rejected[0]?.reason, 'not_object');
+});
+
+test('channel 不匹配（伪造/噪声）→ 拒 channel_mismatch', () => {
+  const { fire, delivered, rejected } = setup();
+  fire({ origin: ALLOWED, data: envelope({ channel: 'evil-channel' }) });
+  assert.equal(delivered.length, 0);
+  assert.equal(rejected[0]?.reason, 'channel_mismatch');
+});
+
+test('type 非白名单（如注入 exec）→ 拒 bad_type', () => {
+  const { fire, delivered, rejected } = setup();
+  fire({ origin: ALLOWED, data: envelope({ type: 'exec' }) });
+  assert.equal(delivered.length, 0);
+  assert.equal(rejected[0]?.reason, 'bad_type');
+});
+
+test('direction 非法 → 拒 bad_direction', () => {
+  const { fire, rejected } = setup();
+  fire({ origin: ALLOWED, data: envelope({ direction: 'sideways' }) });
+  assert.equal(rejected[0]?.reason, 'bad_direction');
+});
+
+test('缺 traceId → 拒 bad_payload', () => {
+  const { fire, rejected } = setup();
+  const e = envelope();
+  delete e.traceId;
+  fire({ origin: ALLOWED, data: e });
+  assert.equal(rejected[0]?.reason, 'bad_payload');
+});
+
+test('缺 payload 字段 → 拒 bad_payload', () => {
+  const { fire, rejected } = setup();
+  const e = envelope();
+  delete e.payload;
+  fire({ origin: ALLOWED, data: e });
+  assert.equal(rejected[0]?.reason, 'bad_payload');
+});
+
+test('requestId 存在但非字符串 → 拒 bad_payload', () => {
+  const { fire, rejected } = setup();
+  fire({ origin: ALLOWED, data: envelope({ requestId: 123 }) });
+  assert.equal(rejected[0]?.reason, 'bad_payload');
+});
+
+test('合法 requestId（字符串）随合法信封 → 分发', () => {
+  const { fire, delivered, rejected } = setup();
+  fire({ origin: ALLOWED, data: envelope({ type: 'ad', requestId: 'r-1' }) });
+  assert.equal(rejected.length, 0);
+  assert.equal(delivered.length, 1);
+});
+
+test('dispose 后任何消息均不再处理', () => {
+  const { bridge, fire, delivered, rejected } = setup();
+  bridge.dispose();
+  fire({ origin: ALLOWED, data: envelope() });
+  assert.equal(delivered.length, 0, 'dispose 后不分发');
+  assert.equal(rejected.length, 0, 'dispose 后直接 return（不走校验/不回调 onReject）');
+});