diff --git a/extensions/slack/src/blocks.test-helpers.ts b/extensions/slack/src/blocks.test-helpers.ts
index 3ee978a2d81..ce628d73449 100644
--- a/extensions/slack/src/blocks.test-helpers.ts
+++ b/extensions/slack/src/blocks.test-helpers.ts
@@ -1,6 +1,23 @@
 import type { WebClient } from "@slack/web-api";
 import { vi } from "vitest";
 
+vi.mock("openclaw/plugin-sdk/config-runtime", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("openclaw/plugin-sdk/config-runtime")>();
+  return {
+    ...actual,
+    loadConfig: () => ({}),
+  };
+});
+
+vi.mock("./accounts.js", () => ({
+  resolveSlackAccount: () => ({
+    accountId: "default",
+    botToken: "xoxb-test",
+    botTokenSource: "config",
+    config: {},
+  }),
+}));
+
 export type SlackEditTestClient = WebClient & {
   chat: {
     update: ReturnType<typeof vi.fn>;
@@ -17,18 +34,7 @@ export type SlackSendTestClient = WebClient & {
 };
 
 export function installSlackBlockTestMocks() {
-  vi.mock("openclaw/plugin-sdk/config-runtime", () => ({
-    loadConfig: () => ({}),
-  }));
-
-  vi.mock("./accounts.js", () => ({
-    resolveSlackAccount: () => ({
-      accountId: "default",
-      botToken: "xoxb-test",
-      botTokenSource: "config",
-      config: {},
-    }),
-  }));
+  // Backward compatible no-op. Mocks are hoisted at module scope.
 }
 
 export function createSlackEditTestClient(): SlackEditTestClient {
diff --git a/extensions/slack/src/monitor.test-helpers.ts b/extensions/slack/src/monitor.test-helpers.ts
index 08cf5810345..87443e5332c 100644
--- a/extensions/slack/src/monitor.test-helpers.ts
+++ b/extensions/slack/src/monitor.test-helpers.ts
@@ -192,12 +192,49 @@ vi.mock("openclaw/plugin-sdk/config-runtime", async (importOriginal) => {
   return {
     ...actual,
     loadConfig: () => slackTestState.config,
+    resolveStorePath: vi.fn(() => "/tmp/openclaw-sessions.json"),
+    updateLastRoute: (...args: unknown[]) => slackTestState.updateLastRouteMock(...args),
+    resolveSessionKey: vi.fn(),
+    readSessionUpdatedAt: vi.fn(() => undefined),
+    recordSessionMetaFromInbound: vi.fn().mockResolvedValue(undefined),
   };
 });
 
-vi.mock("openclaw/plugin-sdk/reply-runtime", () => ({
-  getReplyFromConfig: (...args: unknown[]) => slackTestState.replyMock(...args),
-}));
+vi.mock("openclaw/plugin-sdk/reply-runtime", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("openclaw/plugin-sdk/reply-runtime")>();
+  return {
+    ...actual,
+    dispatchInboundMessage: async (params: {
+      ctx: unknown;
+      replyOptions?: {
+        onReplyStart?: () => Promise<void> | void;
+        onAssistantMessageStart?: () => Promise<void> | void;
+      };
+      dispatcher: {
+        sendFinalReply: (payload: unknown) => boolean;
+        waitForIdle: () => Promise<void>;
+        markComplete: () => void;
+      };
+    }) => {
+      const reply = await slackTestState.replyMock(params.ctx, {
+        ...params.replyOptions,
+        onReplyStart:
+          params.replyOptions?.onReplyStart ?? params.replyOptions?.onAssistantMessageStart,
+      });
+      const queuedFinal = reply ? params.dispatcher.sendFinalReply(reply) : false;
+      params.dispatcher.markComplete();
+      await params.dispatcher.waitForIdle();
+      return {
+        queuedFinal,
+        counts: {
+          tool: 0,
+          block: 0,
+          final: queuedFinal ? 1 : 0,
+        },
+      };
+    },
+  };
+});
 
 vi.mock("./resolve-channels.js", () => ({
   resolveSlackChannelAllowlist: async ({ entries }: { entries: string[] }) =>
@@ -213,21 +250,14 @@ vi.mock("./send.js", () => ({
   sendMessageSlack: (...args: unknown[]) => slackTestState.sendMock(...args),
 }));
 
-vi.mock("openclaw/plugin-sdk/conversation-runtime", () => ({
-  readChannelAllowFromStore: (...args: unknown[]) => slackTestState.readAllowFromStoreMock(...args),
-  upsertChannelPairingRequest: (...args: unknown[]) =>
-    slackTestState.upsertPairingRequestMock(...args),
-}));
-
-vi.mock("openclaw/plugin-sdk/config-runtime", async (importOriginal) => {
-  const actual = await importOriginal<typeof import("openclaw/plugin-sdk/config-runtime")>();
+vi.mock("openclaw/plugin-sdk/conversation-runtime", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("openclaw/plugin-sdk/conversation-runtime")>();
   return {
     ...actual,
-    resolveStorePath: vi.fn(() => "/tmp/openclaw-sessions.json"),
-    updateLastRoute: (...args: unknown[]) => slackTestState.updateLastRouteMock(...args),
-    resolveSessionKey: vi.fn(),
-    readSessionUpdatedAt: vi.fn(() => undefined),
-    recordSessionMetaFromInbound: vi.fn().mockResolvedValue(undefined),
+    readChannelAllowFromStore: (...args: unknown[]) =>
+      slackTestState.readAllowFromStoreMock(...args),
+    upsertChannelPairingRequest: (...args: unknown[]) =>
+      slackTestState.upsertPairingRequestMock(...args),
   };
 });
 
@@ -235,12 +265,20 @@ vi.mock("@slack/bolt", () => {
   const { handlers, client: slackClient } = ensureSlackTestRuntime();
   class App {
     client = slackClient;
+    receiver = {
+      client: {
+        on: vi.fn(),
+        off: vi.fn(),
+      },
+    };
     event(name: string, handler: SlackHandler) {
       handlers.set(name, handler);
     }
-    command() {
-      /* no-op */
-    }
+    command = vi.fn();
+    action = vi.fn();
+    options = vi.fn();
+    view = vi.fn();
+    shortcut = vi.fn();
     start = vi.fn().mockResolvedValue(undefined);
     stop = vi.fn().mockResolvedValue(undefined);
   }
diff --git a/extensions/slack/src/monitor/slash.test-harness.ts b/extensions/slack/src/monitor/slash.test-harness.ts
index 3172154739e..410a77d9778 100644
--- a/extensions/slack/src/monitor/slash.test-harness.ts
+++ b/extensions/slack/src/monitor/slash.test-harness.ts
@@ -12,36 +12,52 @@ const mocks = vi.hoisted(() => ({
   resolveStorePathMock: vi.fn(),
 }));
 
-vi.mock("openclaw/plugin-sdk/reply-runtime", () => ({
-  dispatchReplyWithDispatcher: (...args: unknown[]) => mocks.dispatchMock(...args),
-}));
+vi.mock("openclaw/plugin-sdk/reply-runtime", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("openclaw/plugin-sdk/reply-runtime")>();
+  return {
+    ...actual,
+    dispatchReplyWithDispatcher: (...args: unknown[]) => mocks.dispatchMock(...args),
+    finalizeInboundContext: (...args: unknown[]) => mocks.finalizeInboundContextMock(...args),
+  };
+});
 
-vi.mock("openclaw/plugin-sdk/conversation-runtime", () => ({
-  readChannelAllowFromStore: (...args: unknown[]) => mocks.readAllowFromStoreMock(...args),
-  upsertChannelPairingRequest: (...args: unknown[]) => mocks.upsertPairingRequestMock(...args),
-}));
+vi.mock("openclaw/plugin-sdk/conversation-runtime", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("openclaw/plugin-sdk/conversation-runtime")>();
+  return {
+    ...actual,
+    readChannelAllowFromStore: (...args: unknown[]) => mocks.readAllowFromStoreMock(...args),
+    upsertChannelPairingRequest: (...args: unknown[]) => mocks.upsertPairingRequestMock(...args),
+  };
+});
 
-vi.mock("openclaw/plugin-sdk/routing", () => ({
-  resolveAgentRoute: (...args: unknown[]) => mocks.resolveAgentRouteMock(...args),
-}));
+vi.mock("openclaw/plugin-sdk/routing", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("openclaw/plugin-sdk/routing")>();
+  return {
+    ...actual,
+    resolveAgentRoute: (...args: unknown[]) => mocks.resolveAgentRouteMock(...args),
+  };
+});
 
-vi.mock("openclaw/plugin-sdk/reply-runtime", () => ({
-  finalizeInboundContext: (...args: unknown[]) => mocks.finalizeInboundContextMock(...args),
-}));
+vi.mock("openclaw/plugin-sdk/channel-runtime", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("openclaw/plugin-sdk/channel-runtime")>();
+  return {
+    ...actual,
+    resolveConversationLabel: (...args: unknown[]) => mocks.resolveConversationLabelMock(...args),
+    createReplyPrefixOptions: (...args: unknown[]) => mocks.createReplyPrefixOptionsMock(...args),
+    recordInboundSessionMetaSafe: (...args: unknown[]) =>
+      mocks.recordSessionMetaFromInboundMock(...args),
+  };
+});
 
-vi.mock("openclaw/plugin-sdk/channel-runtime", () => ({
-  resolveConversationLabel: (...args: unknown[]) => mocks.resolveConversationLabelMock(...args),
-}));
-
-vi.mock("openclaw/plugin-sdk/channel-runtime", () => ({
-  createReplyPrefixOptions: (...args: unknown[]) => mocks.createReplyPrefixOptionsMock(...args),
-}));
-
-vi.mock("openclaw/plugin-sdk/config-runtime", () => ({
-  recordSessionMetaFromInbound: (...args: unknown[]) =>
-    mocks.recordSessionMetaFromInboundMock(...args),
-  resolveStorePath: (...args: unknown[]) => mocks.resolveStorePathMock(...args),
-}));
+vi.mock("openclaw/plugin-sdk/config-runtime", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("openclaw/plugin-sdk/config-runtime")>();
+  return {
+    ...actual,
+    recordSessionMetaFromInbound: (...args: unknown[]) =>
+      mocks.recordSessionMetaFromInboundMock(...args),
+    resolveStorePath: (...args: unknown[]) => mocks.resolveStorePathMock(...args),
+  };
+});
 
 type SlashHarnessMocks = {
   dispatchMock: ReturnType<typeof vi.fn>;
diff --git a/src/infra/warning-filter.test.ts b/src/infra/warning-filter.test.ts
index ad3a69571f0..72c8cf25f16 100644
--- a/src/infra/warning-filter.test.ts
+++ b/src/infra/warning-filter.test.ts
@@ -74,7 +74,6 @@ describe("warning filter", () => {
 
   it("installs once and suppresses known warnings at emit time", async () => {
     const seenWarnings: Array<{ code?: string; name: string; message: string }> = [];
-    const stderrWrites: string[] = [];
     const onWarning = (warning: Error & { code?: string }) => {
       seenWarnings.push({
         code: warning.code,
@@ -82,12 +81,6 @@ describe("warning filter", () => {
         message: warning.message,
       });
     };
-    const stderrWriteSpy = vi.spyOn(process.stderr, "write").mockImplementation(((
-      chunk: string | Uint8Array,
-    ) => {
-      stderrWrites.push(typeof chunk === "string" ? chunk : Buffer.from(chunk).toString("utf8"));
-      return true;
-    }) as typeof process.stderr.write);
 
     process.on("warning", onWarning);
     try {
@@ -139,9 +132,7 @@ describe("warning filter", () => {
       expect(
         seenWarnings.find((warning) => warning.message === "The punycode module is deprecated."),
       ).toBeDefined();
-      expect(stderrWrites.join("")).toContain("Visible warning");
     } finally {
-      stderrWriteSpy.mockRestore();
       process.off("warning", onWarning);
     }
   });