diff --git a/packages/mesh/src/tests/record-subscription.test.ts b/packages/mesh/src/tests/record-subscription.test.ts
index 3777677..88cbb7b 100644
--- a/packages/mesh/src/tests/record-subscription.test.ts
+++ b/packages/mesh/src/tests/record-subscription.test.ts
@@ -531,3 +531,196 @@ describe("Record Subscription", () => {
     expect(serverState.version).toBe(2);
   });
 });
+
+describe("Record Subscription (Multiple Instances)", () => {
+  let serverA: MeshServer;
+  let serverB: MeshServer;
+  let clientA: MeshClient;
+  let clientB: MeshClient;
+
+  const portA = 8131;
+  const portB = 8132;
+  const recordId = "test:record:multi-instance";
+  const writableRecordId = "writable:record:multi-instance";
+
+  beforeEach(async () => {
+    await flushRedis();
+
+    serverA = createTestServer(portA);
+    serverB = createTestServer(portB);
+
+    [serverA, serverB].forEach((server) => {
+      server.exposeRecord(/^test:record:.*/);
+      server.exposeWritableRecord(/^writable:record:.*/);
+    });
+
+    await serverA.ready();
+    await serverB.ready();
+
+    clientA = new MeshClient(`ws://localhost:${portA}`);
+    clientB = new MeshClient(`ws://localhost:${portB}`);
+  });
+
+  afterEach(async () => {
+    await clientA.close();
+    await clientB.close();
+    await serverA.close();
+    await serverB.close();
+  });
+
+  test("server-published update propagates across instances (full mode)", async () => {
+    await clientA.connect();
+    await clientB.connect();
+
+    const callbackA = vi.fn();
+    const callbackB = vi.fn();
+
+    await clientA.subscribeRecord(recordId, callbackA);
+    await clientB.subscribeRecord(recordId, callbackB);
+
+    await wait(50);
+    expect(callbackA).toHaveBeenCalledTimes(1);
+    expect(callbackB).toHaveBeenCalledTimes(1);
+    expect(callbackA).toHaveBeenCalledWith({
+      recordId,
+      full: null,
+      version: 0,
+    });
+    expect(callbackB).toHaveBeenCalledWith({
+      recordId,
+      full: null,
+      version: 0,
+    });
+
+    const data1 = { value: "update1" };
+    // server A publishes, should reach both clients
+    await serverA.publishRecordUpdate(recordId, data1);
+
+    await wait(150);
+
+    expect(callbackA).toHaveBeenCalledTimes(2);
+    expect(callbackB).toHaveBeenCalledTimes(2);
+    expect(callbackA).toHaveBeenCalledWith({
+      recordId,
+      full: data1,
+      version: 1,
+    });
+    expect(callbackB).toHaveBeenCalledWith({
+      recordId,
+      full: data1,
+      version: 1,
+    });
+  }, 10000);
+
+  test("client-published update propagates across instances (full mode)", async () => {
+    await clientA.connect();
+    await clientB.connect();
+
+    const callbackA = vi.fn();
+    const callbackB = vi.fn();
+
+    await clientA.subscribeRecord(writableRecordId, callbackA);
+    await clientB.subscribeRecord(writableRecordId, callbackB);
+
+    await wait(50);
+    expect(callbackA).toHaveBeenCalledTimes(1);
+    expect(callbackB).toHaveBeenCalledTimes(1);
+
+    const data1 = { message: "hello from client A" };
+    // client A writes, should propagate to client B via server B
+    const writeSuccess = await clientA.publishRecordUpdate(
+      writableRecordId,
+      data1
+    );
+    expect(writeSuccess).toBe(true);
+
+    await wait(150);
+
+    expect(callbackA).toHaveBeenCalledTimes(2);
+    expect(callbackB).toHaveBeenCalledTimes(2);
+    expect(callbackA).toHaveBeenCalledWith({
+      recordId: writableRecordId,
+      full: data1,
+      version: 1,
+    });
+    expect(callbackB).toHaveBeenCalledWith({
+      recordId: writableRecordId,
+      full: data1,
+      version: 1,
+    });
+  }, 10000);
+
+  test("client-published update propagates across instances (patch mode)", async () => {
+    await clientA.connect();
+    await clientB.connect();
+
+    const callbackA = vi.fn();
+    const callbackB = vi.fn();
+
+    await clientA.subscribeRecord(writableRecordId, callbackA, {
+      mode: "patch",
+    });
+    await clientB.subscribeRecord(writableRecordId, callbackB, {
+      mode: "patch",
+    });
+
+    await wait(50);
+    expect(callbackA).toHaveBeenCalledTimes(1);
+    expect(callbackB).toHaveBeenCalledTimes(1);
+    expect(callbackA).toHaveBeenCalledWith({
+      recordId: writableRecordId,
+      full: null,
+      version: 0,
+    });
+    expect(callbackB).toHaveBeenCalledWith({
+      recordId: writableRecordId,
+      full: null,
+      version: 0,
+    });
+
+    const data1 = { count: 1 };
+    // client A writes first update
+    let writeSuccess = await clientA.publishRecordUpdate(
+      writableRecordId,
+      data1
+    );
+    expect(writeSuccess).toBe(true);
+
+    await wait(150);
+    expect(callbackA).toHaveBeenCalledTimes(2);
+    expect(callbackB).toHaveBeenCalledTimes(2);
+
+    const patch1 = [{ op: "add", path: "/count", value: 1 }];
+    expect(callbackA).toHaveBeenCalledWith({
+      recordId: writableRecordId,
+      patch: patch1,
+      version: 1,
+    });
+    expect(callbackB).toHaveBeenCalledWith({
+      recordId: writableRecordId,
+      patch: patch1,
+      version: 1,
+    });
+
+    const data2 = { count: 1, name: "added" };
+    // client A writes second update
+    writeSuccess = await clientA.publishRecordUpdate(writableRecordId, data2);
+    expect(writeSuccess).toBe(true);
+
+    await wait(150);
+    expect(callbackA).toHaveBeenCalledTimes(3);
+    expect(callbackB).toHaveBeenCalledTimes(3);
+
+    const patch2 = [{ op: "add", path: "/name", value: "added" }];
+    expect(callbackA).toHaveBeenCalledWith({
+      recordId: writableRecordId,
+      patch: patch2,
+      version: 2,
+    });
+    expect(callbackB).toHaveBeenCalledWith({
+      recordId: writableRecordId,
+      patch: patch2,
+      version: 2,
+    });
+  }, 10000);
+});