diff --git a/src/discord/monitor/reply-delivery.test.ts b/src/discord/monitor/reply-delivery.test.ts
new file mode 100644
index 00000000000..cf3b312ee10
--- /dev/null
+++ b/src/discord/monitor/reply-delivery.test.ts
@@ -0,0 +1,85 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+import type { RuntimeEnv } from "../../runtime.js";
+import { deliverDiscordReply } from "./reply-delivery.js";
+
+const sendMessageDiscordMock = vi.hoisted(() => vi.fn());
+const sendVoiceMessageDiscordMock = vi.hoisted(() => vi.fn());
+
+vi.mock("../send.js", () => ({
+  sendMessageDiscord: (...args: unknown[]) => sendMessageDiscordMock(...args),
+  sendVoiceMessageDiscord: (...args: unknown[]) => sendVoiceMessageDiscordMock(...args),
+}));
+
+describe("deliverDiscordReply", () => {
+  const runtime = {} as RuntimeEnv;
+
+  beforeEach(() => {
+    sendMessageDiscordMock.mockReset().mockResolvedValue({
+      messageId: "msg-1",
+      channelId: "channel-1",
+    });
+    sendVoiceMessageDiscordMock.mockReset().mockResolvedValue({
+      messageId: "voice-1",
+      channelId: "channel-1",
+    });
+  });
+
+  it("routes audioAsVoice payloads through the voice API and sends text separately", async () => {
+    await deliverDiscordReply({
+      replies: [
+        {
+          text: "Hello there",
+          mediaUrls: ["https://example.com/voice.ogg", "https://example.com/extra.mp3"],
+          audioAsVoice: true,
+        },
+      ],
+      target: "channel:123",
+      token: "token",
+      runtime,
+      textLimit: 2000,
+      replyToId: "reply-1",
+    });
+
+    expect(sendVoiceMessageDiscordMock).toHaveBeenCalledTimes(1);
+    expect(sendVoiceMessageDiscordMock).toHaveBeenCalledWith(
+      "channel:123",
+      "https://example.com/voice.ogg",
+      expect.objectContaining({ token: "token", replyTo: "reply-1" }),
+    );
+
+    expect(sendMessageDiscordMock).toHaveBeenCalledTimes(2);
+    expect(sendMessageDiscordMock).toHaveBeenNthCalledWith(
+      1,
+      "channel:123",
+      "Hello there",
+      expect.objectContaining({ token: "token" }),
+    );
+    expect(sendMessageDiscordMock).toHaveBeenNthCalledWith(
+      2,
+      "channel:123",
+      "",
+      expect.objectContaining({ token: "token", mediaUrl: "https://example.com/extra.mp3" }),
+    );
+    expect(sendMessageDiscordMock.mock.calls[0]?.[2]).not.toHaveProperty("replyTo");
+    expect(sendMessageDiscordMock.mock.calls[1]?.[2]).not.toHaveProperty("replyTo");
+  });
+
+  it("skips follow-up text when the voice payload text is blank", async () => {
+    await deliverDiscordReply({
+      replies: [
+        {
+          text: "   ",
+          mediaUrl: "https://example.com/voice.ogg",
+          audioAsVoice: true,
+        },
+      ],
+      target: "channel:456",
+      token: "token",
+      runtime,
+      textLimit: 2000,
+    });
+
+    expect(sendVoiceMessageDiscordMock).toHaveBeenCalledTimes(1);
+    expect(sendMessageDiscordMock).not.toHaveBeenCalled();
+  });
+});