diff --git a/test/integration-pubsub-redis.test.ts b/test/integration-pubsub-redis.test.ts
new file mode 100644
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--- /dev/null
+++ b/test/integration-pubsub-redis.test.ts
@@ -0,0 +1,346 @@
+import { describe, it, expect, vi } from "vitest";
+import { createPubSub } from "../src/create_pubsub.js";
+import { createRedisEventTarget } from "../src/event-target-redis.js";
+import type { EventEnvelope } from "../src/types.js";
+
+type TestEventMap = {
+  "message.sent": string;
+  "user.joined": { name: string };
+  "call.responded": { status: string };
+  "session.started": { sessionId: string; timestamp: number };
+};
+
+function createLinkedMockRedis() {
+  const publications: { channel: string; message: string }[] = [];
+  const subscriptions: { channel: string }[] = [];
+  const unsubscriptions: { channel: string }[] = [];
+  let messageListener: ((channel: string, message: string) => void) | null = null;
+
+  const publishClient = {
+    publish: vi.fn((channel: string, message: string) => {
+      publications.push({ channel, message });
+      if (messageListener) {
+        setImmediate(() => messageListener!(channel, message));
+      }
+      return 1;
+    }),
+    publications,
+  };
+
+  const subscribeClient = {
+    subscribe: vi.fn((channel: string) => {
+      subscriptions.push({ channel });
+    }),
+    unsubscribe: vi.fn((channel: string) => {
+      unsubscriptions.push({ channel });
+    }),
+    on: vi.fn((event: string, callback: (channel: string, message: string) => void) => {
+      if (event === "message") {
+        messageListener = callback;
+      }
+      return {} as any;
+    }),
+    subscriptions,
+    unsubscriptions,
+  };
+
+  return { publishClient, subscribeClient };
+}
+
+describe("createPubSub with Redis event target", () => {
+  describe("publish", () => {
+    it("dispatches event through Redis and subscriber receives it", async () => {
+      const { publishClient, subscribeClient } = createLinkedMockRedis();
+      const eventTarget = createRedisEventTarget({
+        publishClient: publishClient as any,
+        subscribeClient: subscribeClient as any,
+      });
+      const pubsub = createPubSub<TestEventMap>({ eventTarget: eventTarget as any });
+
+      const received: EventEnvelope<"message.sent", string>[] = [];
+      const iterator = pubsub.subscribe("message.sent", "msg1");
+
+      const consume = (async () => {
+        for await (const envelope of iterator) {
+          received.push(envelope);
+          if (received.length >= 1) break;
+        }
+      })();
+
+      pubsub.publish("message.sent", "msg1", "hello redis");
+
+      await consume;
+
+      expect(received).toHaveLength(1);
+      expect(received[0].type).toBe("message.sent");
+      expect(received[0].id).toBe("msg1");
+      expect(received[0].payload).toBe("hello redis");
+    });
+
+    it("publishes to Redis with correct channel name matching type:id", () => {
+      const { publishClient, subscribeClient } = createLinkedMockRedis();
+      const eventTarget = createRedisEventTarget({
+        publishClient: publishClient as any,
+        subscribeClient: subscribeClient as any,
+      });
+      const pubsub = createPubSub<TestEventMap>({ eventTarget: eventTarget as any });
+
+      pubsub.publish("user.joined", "user-42", { name: "Alice" });
+
+      expect(publishClient.publish).toHaveBeenCalledTimes(1);
+      expect(publishClient.publish).toHaveBeenCalledWith(
+        "user.joined:user-42",
+        JSON.stringify({ type: "user.joined", id: "user-42", payload: { name: "Alice" } }),
+      );
+    });
+  });
+
+  describe("subscribe", () => {
+    it("subscribes to Redis channel on subscribe call", async () => {
+      const { publishClient, subscribeClient } = createLinkedMockRedis();
+      const eventTarget = createRedisEventTarget({
+        publishClient: publishClient as any,
+        subscribeClient: subscribeClient as any,
+      });
+      const pubsub = createPubSub<TestEventMap>({ eventTarget: eventTarget as any });
+
+      const iterator = pubsub.subscribe("message.sent", "sub1");
+
+      const consume = (async () => {
+        for await (const envelope of iterator) {
+          if (envelope.payload === "done") break;
+        }
+      })();
+
+      expect(subscribeClient.subscribe).toHaveBeenCalledWith("message.sent:sub1");
+
+      pubsub.publish("message.sent", "sub1", "done");
+      await consume;
+    });
+
+    it("receives events only for the subscribed topic", async () => {
+      const { publishClient, subscribeClient } = createLinkedMockRedis();
+      const eventTarget = createRedisEventTarget({
+        publishClient: publishClient as any,
+        subscribeClient: subscribeClient as any,
+      });
+      const pubsub = createPubSub<TestEventMap>({ eventTarget: eventTarget as any });
+
+      const received: EventEnvelope<"message.sent", string>[] = [];
+
+      const iterator = pubsub.subscribe("message.sent", "filtered");
+
+      const consume = (async () => {
+        for await (const envelope of iterator) {
+          received.push(envelope);
+          if (received.length >= 2) break;
+        }
+      })();
+
+      pubsub.publish("message.sent", "filtered", "first");
+      pubsub.publish("message.sent", "other", "wrong topic");
+      pubsub.publish("message.sent", "filtered", "second");
+
+      await consume;
+
+      expect(received).toHaveLength(2);
+      expect(received[0].payload).toBe("first");
+      expect(received[1].payload).toBe("second");
+    });
+
+    it("multiple subscribers on the same topic all receive events", async () => {
+      const { publishClient, subscribeClient } = createLinkedMockRedis();
+      const eventTarget = createRedisEventTarget({
+        publishClient: publishClient as any,
+        subscribeClient: subscribeClient as any,
+      });
+      const pubsub = createPubSub<TestEventMap>({ eventTarget: eventTarget as any });
+
+      const received1: EventEnvelope<"message.sent", string>[] = [];
+      const received2: EventEnvelope<"message.sent", string>[] = [];
+
+      const iterator1 = pubsub.subscribe("message.sent", "broadcast1");
+      const iterator2 = pubsub.subscribe("message.sent", "broadcast1");
+
+      const consume1 = (async () => {
+        for await (const envelope of iterator1) {
+          received1.push(envelope);
+          if (received1.length >= 1) break;
+        }
+      })();
+
+      const consume2 = (async () => {
+        for await (const envelope of iterator2) {
+          received2.push(envelope);
+          if (received2.length >= 1) break;
+        }
+      })();
+
+      pubsub.publish("message.sent", "broadcast1", "hello all");
+
+      await Promise.all([consume1, consume2]);
+
+      expect(received1).toHaveLength(1);
+      expect(received2).toHaveLength(1);
+      expect(received1[0].payload).toBe("hello all");
+      expect(received2[0].payload).toBe("hello all");
+    });
+  });
+
+  describe("full envelope round-trip", () => {
+    it("preserves type, id, and payload through serialization/deserialization", async () => {
+      const { publishClient, subscribeClient } = createLinkedMockRedis();
+      const eventTarget = createRedisEventTarget({
+        publishClient: publishClient as any,
+        subscribeClient: subscribeClient as any,
+      });
+      const pubsub = createPubSub<TestEventMap>({ eventTarget: eventTarget as any });
+
+      const received: EventEnvelope<"session.started", { sessionId: string; timestamp: number }>[] = [];
+      const iterator = pubsub.subscribe("session.started", "sess-abc");
+
+      const consume = (async () => {
+        for await (const envelope of iterator) {
+          received.push(envelope);
+          if (received.length >= 1) break;
+        }
+      })();
+
+      pubsub.publish("session.started", "sess-abc", { sessionId: "sess-abc", timestamp: 1700000000 });
+
+      await consume;
+
+      expect(received).toHaveLength(1);
+      expect(received[0]).toEqual({
+        type: "session.started",
+        id: "sess-abc",
+        payload: { sessionId: "sess-abc", timestamp: 1700000000 },
+      });
+    });
+
+    it("round-trips envelope with simple string payload", async () => {
+      const { publishClient, subscribeClient } = createLinkedMockRedis();
+      const eventTarget = createRedisEventTarget({
+        publishClient: publishClient as any,
+        subscribeClient: subscribeClient as any,
+      });
+      const pubsub = createPubSub<TestEventMap>({ eventTarget: eventTarget as any });
+
+      const received: EventEnvelope<"message.sent", string>[] = [];
+      const iterator = pubsub.subscribe("message.sent", "rt1");
+
+      const consume = (async () => {
+        for await (const envelope of iterator) {
+          received.push(envelope);
+          if (received.length >= 1) break;
+        }
+      })();
+
+      pubsub.publish("message.sent", "rt1", "round-trip test");
+
+      await consume;
+
+      expect(received[0].type).toBe("message.sent");
+      expect(received[0].id).toBe("rt1");
+      expect(received[0].payload).toBe("round-trip test");
+    });
+  });
+
+  describe("topic scoping with type:id through Redis", () => {
+    it("scoped topics like call.responded:uuid-123 work correctly", async () => {
+      const { publishClient, subscribeClient } = createLinkedMockRedis();
+      const eventTarget = createRedisEventTarget({
+        publishClient: publishClient as any,
+        subscribeClient: subscribeClient as any,
+      });
+      const pubsub = createPubSub<TestEventMap>({ eventTarget: eventTarget as any });
+
+      const received: EventEnvelope<"call.responded", { status: string }>[] = [];
+      const iterator = pubsub.subscribe("call.responded", "uuid-123");
+
+      const consume = (async () => {
+        for await (const envelope of iterator) {
+          received.push(envelope);
+          if (received.length >= 1) break;
+        }
+      })();
+
+      pubsub.publish("call.responded", "uuid-123", { status: "ok" });
+
+      await consume;
+
+      expect(received).toHaveLength(1);
+      expect(received[0].type).toBe("call.responded");
+      expect(received[0].id).toBe("uuid-123");
+      expect(received[0].payload).toEqual({ status: "ok" });
+
+      expect(publishClient.publish).toHaveBeenCalledWith(
+        "call.responded:uuid-123",
+        JSON.stringify({ type: "call.responded", id: "uuid-123", payload: { status: "ok" } }),
+      );
+      expect(subscribeClient.subscribe).toHaveBeenCalledWith("call.responded:uuid-123");
+    });
+
+    it("events on one scoped topic do not leak to another scoped topic", async () => {
+      const { publishClient, subscribeClient } = createLinkedMockRedis();
+      const eventTarget = createRedisEventTarget({
+        publishClient: publishClient as any,
+        subscribeClient: subscribeClient as any,
+      });
+      const pubsub = createPubSub<TestEventMap>({ eventTarget: eventTarget as any });
+
+      const received: EventEnvelope<"call.responded", { status: string }>[] = [];
+      const iterator = pubsub.subscribe("call.responded", "uuid-aaa");
+
+      const consume = (async () => {
+        for await (const envelope of iterator) {
+          received.push(envelope);
+          if (received.length >= 1) break;
+        }
+      })();
+
+      pubsub.publish("call.responded", "uuid-bbb", { status: "wrong" });
+      pubsub.publish("call.responded", "uuid-aaa", { status: "correct" });
+
+      await consume;
+
+      expect(received).toHaveLength(1);
+      expect(received[0].id).toBe("uuid-aaa");
+      expect(received[0].payload).toEqual({ status: "correct" });
+    });
+  });
+
+  describe("channel prefix", () => {
+    it("applies prefix to both publish and subscribe channels", async () => {
+      const { publishClient, subscribeClient } = createLinkedMockRedis();
+      const eventTarget = createRedisEventTarget({
+        publishClient: publishClient as any,
+        subscribeClient: subscribeClient as any,
+        prefix: "alk:events:",
+      });
+      const pubsub = createPubSub<TestEventMap>({ eventTarget: eventTarget as any });
+
+      const received: EventEnvelope<"message.sent", string>[] = [];
+      const iterator = pubsub.subscribe("message.sent", "prefixed-1");
+
+      const consume = (async () => {
+        for await (const envelope of iterator) {
+          received.push(envelope);
+          if (received.length >= 1) break;
+        }
+      })();
+
+      pubsub.publish("message.sent", "prefixed-1", "with prefix");
+
+      await consume;
+
+      expect(subscribeClient.subscribe).toHaveBeenCalledWith("alk:events:message.sent:prefixed-1");
+      expect(publishClient.publish).toHaveBeenCalledWith(
+        "alk:events:message.sent:prefixed-1",
+        JSON.stringify({ type: "message.sent", id: "prefixed-1", payload: "with prefix" }),
+      );
+      expect(received).toHaveLength(1);
+      expect(received[0].payload).toBe("with prefix");
+    });
+  });
+});
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