diff --git a/cypher-executor/src/routes/health.ts b/cypher-executor/src/routes/health.ts
index 5485639..e1e847e 100644
--- a/cypher-executor/src/routes/health.ts
+++ b/cypher-executor/src/routes/health.ts
@@ -4,7 +4,7 @@ import type { Bindings } from '../types';
 export const healthRouter = new Hono<{ Bindings: Bindings }>();
 
 healthRouter.get('/health', (c) =>
-  c.json({ ok: true })
+  c.json({ ok: true, bundle_version: c.env.ARCRUN_BUNDLE_VERSION ?? '' })
 );
 
 healthRouter.get('/', (c) =>
diff --git a/cypher-executor/src/types.ts b/cypher-executor/src/types.ts
index 742faa4..de78426 100644
--- a/cypher-executor/src/types.ts
+++ b/cypher-executor/src/types.ts
@@ -96,6 +96,9 @@ export type Bindings = {
   GITEA_TOKEN?: string; // wrangler secret（建議唯讀 scope token）
   GITEA_SPRINT_REPO?: string; // 預設 Leo/InkStoneCo
   GITEA_SPRINT_DIR?: string; // 預設 system-dev/docs/3-specs/autonomy-dispatch
+  // 安裝器部署時注入的 bundle 版本（格式 "YYYY-MM-DD/commit"，老實例無此 var）。
+  // daemon 比對此值決定是否提示用戶更新（/health 曝露，缺 var 時回空字串）。
+  ARCRUN_BUNDLE_VERSION?: string;
   // MCP access_token 存活秒數的「顯示鏡像」（console 設定頁 MCP TTL 佔位區塊用）。
   // 真相住在 mcp worker 的同名 env（mcp/src/types.ts，預設 2592000＝30 天）；cypher 這份
   // 只供顯示，兩處部署時要一致（#32 形態 config 同步教訓）。未設 → 頁面如實標「預設值」。
diff --git a/cypher-executor/tests/health.test.ts b/cypher-executor/tests/health.test.ts
new file mode 100644
index 0000000..19d2215
--- /dev/null
+++ b/cypher-executor/tests/health.test.ts
@@ -0,0 +1,27 @@
+import { describe, it, expect } from 'vitest';
+import { SELF } from 'cloudflare:test';
+import { healthRouter } from '../src/routes/health';
+import type { Bindings, ExecutionContext } from '../src/types';
+
+describe('GET /health — bundle_version 欄位', () => {
+  it('無 ARCRUN_BUNDLE_VERSION 時回空字串（老實例情境）', async () => {
+    // wrangler.test.toml 不設此 var → 走 ?? '' fallback
+    const res = await SELF.fetch('http://localhost/health');
+    const data = await res.json() as { ok: boolean; bundle_version: string };
+    expect(res.status).toBe(200);
+    expect(data.ok).toBe(true);
+    expect(data.bundle_version).toBe('');
+  });
+
+  it('有 ARCRUN_BUNDLE_VERSION 時回其值（安裝器注入情境）', async () => {
+    const fakeEnv = { ARCRUN_BUNDLE_VERSION: '2026-07-28/6d06162' } as unknown as Bindings;
+    const res = await healthRouter.fetch(
+      new Request('http://localhost/health'),
+      fakeEnv,
+      {} as ExecutionContext,
+    );
+    const data = await res.json() as { ok: boolean; bundle_version: string };
+    expect(data.ok).toBe(true);
+    expect(data.bundle_version).toBe('2026-07-28/6d06162');
+  });
+});