diff --git a/src/slack/monitor.test-helpers.ts b/src/slack/monitor.test-helpers.ts
index 151eb58711..17b868fa97 100644
--- a/src/slack/monitor.test-helpers.ts
+++ b/src/slack/monitor.test-helpers.ts
@@ -34,6 +34,7 @@ type SlackClient = {
   conversations: {
     info: Mock<(...args: unknown[]) => Promise<Record<string, unknown>>>;
     replies: Mock<(...args: unknown[]) => Promise<Record<string, unknown>>>;
+    history: Mock<(...args: unknown[]) => Promise<Record<string, unknown>>>;
   };
   users: {
     info: Mock<(...args: unknown[]) => Promise<{ user: { profile: { display_name: string } } }>>;
@@ -197,6 +198,7 @@ vi.mock("@slack/bolt", () => {
         channel: { name: "dm", is_im: true },
       }),
       replies: vi.fn().mockResolvedValue({ messages: [] }),
+      history: vi.fn().mockResolvedValue({ messages: [] }),
     },
     users: {
       info: vi.fn().mockResolvedValue({
diff --git a/src/slack/monitor.threading.missing-thread-ts.test.ts b/src/slack/monitor.threading.missing-thread-ts.test.ts
index 57e0d7ff01..69117616a4 100644
--- a/src/slack/monitor.threading.missing-thread-ts.test.ts
+++ b/src/slack/monitor.threading.missing-thread-ts.test.ts
@@ -1,122 +1,75 @@
 import { beforeEach, describe, expect, it, vi } from "vitest";
 import { resetInboundDedupe } from "../auto-reply/reply/inbound-dedupe.js";
+import {
+  flush,
+  getSlackClient,
+  getSlackHandlerOrThrow,
+  getSlackTestState,
+  resetSlackTestState,
+  startSlackMonitor,
+  stopSlackMonitor,
+} from "./monitor.test-helpers.js";
 
 const { monitorSlackProvider } = await import("./monitor.js");
 
-const sendMock = vi.fn();
-const replyMock = vi.fn();
-const updateLastRouteMock = vi.fn();
-const reactMock = vi.fn();
-let config: Record<string, unknown> = {};
-const readAllowFromStoreMock = vi.fn();
-const upsertPairingRequestMock = vi.fn();
-const getSlackHandlers = () =>
-  (
-    globalThis as {
-      __slackHandlers?: Map<string, (args: unknown) => Promise<void>>;
-    }
-  ).__slackHandlers;
-const getSlackClient = () =>
-  (globalThis as { __slackClient?: Record<string, unknown> }).__slackClient;
+const slackTestState = getSlackTestState();
 
-vi.mock("../config/config.js", async (importOriginal) => {
-  const actual = await importOriginal<typeof import("../config/config.js")>();
+type SlackConversationsClient = {
+  history: ReturnType<typeof vi.fn>;
+  info: ReturnType<typeof vi.fn>;
+};
+
+function makeThreadReplyEvent() {
   return {
-    ...actual,
-    loadConfig: () => config,
-  };
-});
-
-vi.mock("../auto-reply/reply.js", () => ({
-  getReplyFromConfig: (...args: unknown[]) => replyMock(...args),
-}));
-
-vi.mock("./resolve-channels.js", () => ({
-  resolveSlackChannelAllowlist: async ({ entries }: { entries: string[] }) =>
-    entries.map((input) => ({ input, resolved: false })),
-}));
-
-vi.mock("./resolve-users.js", () => ({
-  resolveSlackUserAllowlist: async ({ entries }: { entries: string[] }) =>
-    entries.map((input) => ({ input, resolved: false })),
-}));
-
-vi.mock("./send.js", () => ({
-  sendMessageSlack: (...args: unknown[]) => sendMock(...args),
-}));
-
-vi.mock("../pairing/pairing-store.js", () => ({
-  readChannelAllowFromStore: (...args: unknown[]) => readAllowFromStoreMock(...args),
-  upsertChannelPairingRequest: (...args: unknown[]) => upsertPairingRequestMock(...args),
-}));
-
-vi.mock("../config/sessions.js", () => ({
-  resolveStorePath: vi.fn(() => "/tmp/openclaw-sessions.json"),
-  updateLastRoute: (...args: unknown[]) => updateLastRouteMock(...args),
-  resolveSessionKey: vi.fn(),
-  readSessionUpdatedAt: vi.fn(() => undefined),
-  recordSessionMetaFromInbound: vi.fn().mockResolvedValue(undefined),
-}));
-
-vi.mock("@slack/bolt", () => {
-  const handlers = new Map<string, (args: unknown) => Promise<void>>();
-  (globalThis as { __slackHandlers?: typeof handlers }).__slackHandlers = handlers;
-  const client = {
-    auth: { test: vi.fn().mockResolvedValue({ user_id: "bot-user" }) },
-    conversations: {
-      info: vi.fn().mockResolvedValue({
-        channel: { name: "general", is_channel: true },
-      }),
-      replies: vi.fn().mockResolvedValue({ messages: [] }),
-      history: vi.fn().mockResolvedValue({ messages: [] }),
-    },
-    users: {
-      info: vi.fn().mockResolvedValue({
-        user: { profile: { display_name: "Ada" } },
-      }),
-    },
-    assistant: {
-      threads: {
-        setStatus: vi.fn().mockResolvedValue({ ok: true }),
-      },
-    },
-    reactions: {
-      add: (...args: unknown[]) => reactMock(...args),
+    event: {
+      type: "message",
+      user: "U1",
+      text: "hello",
+      ts: "456",
+      parent_user_id: "U2",
+      channel: "C1",
+      channel_type: "channel",
     },
   };
-  (globalThis as { __slackClient?: typeof client }).__slackClient = client;
-  class App {
-    client = client;
-    event(name: string, handler: (args: unknown) => Promise<void>) {
-      handlers.set(name, handler);
-    }
-    command() {
-      /* no-op */
-    }
-    start = vi.fn().mockResolvedValue(undefined);
-    stop = vi.fn().mockResolvedValue(undefined);
-  }
-  class HTTPReceiver {
-    requestListener = vi.fn();
-  }
-  return { App, HTTPReceiver, default: { App, HTTPReceiver } };
-});
+}
 
-const flush = () => new Promise((resolve) => setTimeout(resolve, 0));
-
-async function waitForEvent(name: string) {
-  for (let i = 0; i < 10; i += 1) {
-    if (getSlackHandlers()?.has(name)) {
-      return;
-    }
-    await flush();
+function getConversationsClient(): SlackConversationsClient {
+  const client = getSlackClient();
+  if (!client) {
+    throw new Error("Slack client not registered");
   }
+  return client.conversations as SlackConversationsClient;
+}
+
+async function runMissingThreadScenario(params: {
+  historyResponse?: { messages: Array<{ ts?: string; thread_ts?: string }> };
+  historyError?: Error;
+}) {
+  slackTestState.replyMock.mockResolvedValue({ text: "thread reply" });
+
+  const conversations = getConversationsClient();
+  if (params.historyError) {
+    conversations.history.mockRejectedValueOnce(params.historyError);
+  } else {
+    conversations.history.mockResolvedValueOnce(
+      params.historyResponse ?? { messages: [{ ts: "456" }] },
+    );
+  }
+
+  const { controller, run } = startSlackMonitor(monitorSlackProvider);
+  const handler = await getSlackHandlerOrThrow("message");
+  await handler(makeThreadReplyEvent());
+
+  await flush();
+  await stopSlackMonitor({ controller, run });
+
+  expect(slackTestState.sendMock).toHaveBeenCalledTimes(1);
+  return slackTestState.sendMock.mock.calls[0]?.[2];
 }
 
 beforeEach(() => {
   resetInboundDedupe();
-  getSlackHandlers()?.clear();
-  config = {
+  resetSlackTestState({
     messages: { responsePrefix: "PFX" },
     channels: {
       slack: {
@@ -125,60 +78,32 @@ beforeEach(() => {
         channels: { C1: { allow: true, requireMention: false } },
       },
     },
-  };
-  sendMock.mockReset().mockResolvedValue(undefined);
-  replyMock.mockReset();
-  updateLastRouteMock.mockReset();
-  reactMock.mockReset();
-  readAllowFromStoreMock.mockReset().mockResolvedValue([]);
-  upsertPairingRequestMock.mockReset().mockResolvedValue({ code: "PAIRCODE", created: true });
+  });
+  const conversations = getConversationsClient();
+  conversations.info.mockResolvedValue({
+    channel: { name: "general", is_channel: true },
+  });
 });
 
 describe("monitorSlackProvider threading", () => {
   it("recovers missing thread_ts when parent_user_id is present", async () => {
-    replyMock.mockResolvedValue({ text: "thread reply" });
-
-    const client = getSlackClient();
-    if (!client) {
-      throw new Error("Slack client not registered");
-    }
-    const conversations = client.conversations as {
-      history: ReturnType<typeof vi.fn>;
-    };
-    conversations.history.mockResolvedValueOnce({
-      messages: [{ ts: "456", thread_ts: "111.222" }],
+    const options = await runMissingThreadScenario({
+      historyResponse: { messages: [{ ts: "456", thread_ts: "111.222" }] },
     });
+    expect(options).toMatchObject({ threadTs: "111.222" });
+  });
 
-    const controller = new AbortController();
-    const run = monitorSlackProvider({
-      botToken: "bot-token",
-      appToken: "app-token",
-      abortSignal: controller.signal,
+  it("continues without thread_ts when history lookup returns no thread result", async () => {
+    const options = await runMissingThreadScenario({
+      historyResponse: { messages: [{ ts: "456" }] },
     });
+    expect(options).not.toMatchObject({ threadTs: "111.222" });
+  });
 
-    await waitForEvent("message");
-    const handler = getSlackHandlers()?.get("message");
-    if (!handler) {
-      throw new Error("Slack message handler not registered");
-    }
-
-    await handler({
-      event: {
-        type: "message",
-        user: "U1",
-        text: "hello",
-        ts: "456",
-        parent_user_id: "U2",
-        channel: "C1",
-        channel_type: "channel",
-      },
+  it("continues without thread_ts when history lookup throws", async () => {
+    const options = await runMissingThreadScenario({
+      historyError: new Error("history failed"),
     });
-
-    await flush();
-    controller.abort();
-    await run;
-
-    expect(sendMock).toHaveBeenCalledTimes(1);
-    expect(sendMock.mock.calls[0][2]).toMatchObject({ threadTs: "111.222" });
+    expect(options).not.toMatchObject({ threadTs: "111.222" });
   });
 });