diff --git a/src/gateway/server/health-state.test.ts b/src/gateway/server/health-state.test.ts
new file mode 100644
index 00000000000..d6ebeaf1a94
--- /dev/null
+++ b/src/gateway/server/health-state.test.ts
@@ -0,0 +1,102 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+const loadConfigMock = vi.hoisted(() => vi.fn());
+const createConfigIOMock = vi.hoisted(() => vi.fn());
+const resolveDefaultAgentIdMock = vi.hoisted(() => vi.fn());
+const resolveMainSessionKeyMock = vi.hoisted(() => vi.fn());
+const normalizeMainKeyMock = vi.hoisted(() => vi.fn());
+const listSystemPresenceMock = vi.hoisted(() => vi.fn());
+const resolveGatewayAuthMock = vi.hoisted(() => vi.fn());
+const getUpdateAvailableMock = vi.hoisted(() => vi.fn());
+const resolveAgentCortexConfigMock = vi.hoisted(() => vi.fn());
+const getLatestCortexCaptureHistoryEntrySyncMock = vi.hoisted(() => vi.fn());
+
+vi.mock("../../config/config.js", () => ({
+  STATE_DIR: "/tmp/openclaw-state",
+  createConfigIO: createConfigIOMock,
+  loadConfig: loadConfigMock,
+}));
+
+vi.mock("../../agents/agent-scope.js", () => ({
+  resolveDefaultAgentId: resolveDefaultAgentIdMock,
+}));
+
+vi.mock("../../config/sessions.js", () => ({
+  resolveMainSessionKey: resolveMainSessionKeyMock,
+}));
+
+vi.mock("../../routing/session-key.js", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("../../routing/session-key.js")>();
+  return {
+    ...actual,
+    DEFAULT_ACCOUNT_ID: "default",
+    normalizeMainKey: normalizeMainKeyMock,
+  };
+});
+
+vi.mock("../../infra/system-presence.js", () => ({
+  listSystemPresence: listSystemPresenceMock,
+}));
+
+vi.mock("../auth.js", () => ({
+  resolveGatewayAuth: resolveGatewayAuthMock,
+}));
+
+vi.mock("../../infra/update-startup.js", () => ({
+  getUpdateAvailable: getUpdateAvailableMock,
+}));
+
+vi.mock("../../agents/cortex.js", () => ({
+  resolveAgentCortexConfig: resolveAgentCortexConfigMock,
+}));
+
+vi.mock("../../agents/cortex-history.js", () => ({
+  getLatestCortexCaptureHistoryEntrySync: getLatestCortexCaptureHistoryEntrySyncMock,
+}));
+
+import { buildGatewaySnapshot } from "./health-state.js";
+
+describe("buildGatewaySnapshot", () => {
+  afterEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("includes Cortex snapshot details when the prompt bridge is enabled", () => {
+    loadConfigMock.mockReturnValue({
+      session: { mainKey: "main", scope: "per-sender" },
+    });
+    createConfigIOMock.mockReturnValue({ configPath: "/tmp/openclaw/openclaw.json" });
+    resolveDefaultAgentIdMock.mockReturnValue("main");
+    resolveMainSessionKeyMock.mockReturnValue("agent:main:main");
+    normalizeMainKeyMock.mockReturnValue("main");
+    listSystemPresenceMock.mockReturnValue([]);
+    resolveGatewayAuthMock.mockReturnValue({ mode: "token" });
+    getUpdateAvailableMock.mockReturnValue(undefined);
+    resolveAgentCortexConfigMock.mockReturnValue({
+      enabled: true,
+      mode: "technical",
+      maxChars: 1500,
+      graphPath: ".cortex/context.json",
+    });
+    getLatestCortexCaptureHistoryEntrySyncMock.mockReturnValue({
+      agentId: "main",
+      captured: true,
+      score: 0.7,
+      reason: "high-signal memory candidate",
+      syncPlatforms: ["claude-code", "cursor", "copilot"],
+      timestamp: 1234,
+    });
+
+    const snapshot = buildGatewaySnapshot();
+
+    expect(snapshot.cortex).toEqual({
+      enabled: true,
+      mode: "technical",
+      graphPath: ".cortex/context.json",
+      lastCaptureAtMs: 1234,
+      lastCaptureReason: "high-signal memory candidate",
+      lastCaptureStored: true,
+      lastSyncPlatforms: ["claude-code", "cursor", "copilot"],
+    });
+  });
+});