diff --git a/extensions/microsoft/speech-provider.test.ts b/extensions/microsoft/speech-provider.test.ts
index ce0989559f8..fbe52717da3 100644
--- a/extensions/microsoft/speech-provider.test.ts
+++ b/extensions/microsoft/speech-provider.test.ts
@@ -3,6 +3,7 @@ import os from "node:os";
 import path from "node:path";
 import type { OpenClawConfig } from "openclaw/plugin-sdk/config-runtime";
 import { afterEach, describe, expect, it, vi } from "vitest";
+import { installDebugProxyTestResetHooks } from "../test-support/debug-proxy-env-test-helpers.js";
 
 vi.mock("node-edge-tts", () => ({
   EdgeTTS: class {
@@ -20,28 +21,7 @@ import * as ttsModule from "./tts.js";
 const TEST_CFG = {} as OpenClawConfig;
 
 describe("listMicrosoftVoices", () => {
-  const originalFetch = globalThis.fetch;
-  const proxyEnvKeys = [
-    "OPENCLAW_DEBUG_PROXY_ENABLED",
-    "OPENCLAW_DEBUG_PROXY_DB_PATH",
-    "OPENCLAW_DEBUG_PROXY_BLOB_DIR",
-    "OPENCLAW_DEBUG_PROXY_SESSION_ID",
-  ] as const;
-  let priorProxyEnv: Partial<Record<(typeof proxyEnvKeys)[number], string | undefined>> = {};
-
-  afterEach(() => {
-    globalThis.fetch = originalFetch;
-    vi.restoreAllMocks();
-    for (const key of proxyEnvKeys) {
-      const value = priorProxyEnv[key];
-      if (value === undefined) {
-        delete process.env[key];
-      } else {
-        process.env[key] = value;
-      }
-    }
-    priorProxyEnv = {};
-  });
+  const proxyReset = installDebugProxyTestResetHooks();
 
   it("maps Microsoft voice metadata into speech voice options", async () => {
     globalThis.fetch = vi.fn().mockResolvedValue(
@@ -89,9 +69,7 @@ describe("listMicrosoftVoices", () => {
 
   it("records voice discovery exchanges in debug proxy capture mode", async () => {
     const tempDir = mkdtempSync(path.join(os.tmpdir(), "microsoft-voices-capture-"));
-    priorProxyEnv = Object.fromEntries(
-      proxyEnvKeys.map((key) => [key, process.env[key]]),
-    ) as typeof priorProxyEnv;
+    proxyReset.captureProxyEnv();
     process.env.OPENCLAW_DEBUG_PROXY_ENABLED = "1";
     process.env.OPENCLAW_DEBUG_PROXY_DB_PATH = path.join(tempDir, "capture.sqlite");
     process.env.OPENCLAW_DEBUG_PROXY_BLOB_DIR = path.join(tempDir, "blobs");
@@ -134,9 +112,7 @@ describe("listMicrosoftVoices", () => {
 
   it("does not double-capture voice discovery when the global fetch patch is installed", async () => {
     const tempDir = mkdtempSync(path.join(os.tmpdir(), "microsoft-voices-global-"));
-    priorProxyEnv = Object.fromEntries(
-      proxyEnvKeys.map((key) => [key, process.env[key]]),
-    ) as typeof priorProxyEnv;
+    proxyReset.captureProxyEnv();
     process.env.OPENCLAW_DEBUG_PROXY_ENABLED = "1";
     process.env.OPENCLAW_DEBUG_PROXY_DB_PATH = path.join(tempDir, "capture.sqlite");
     process.env.OPENCLAW_DEBUG_PROXY_BLOB_DIR = path.join(tempDir, "blobs");
@@ -175,7 +151,7 @@ describe("listMicrosoftVoices", () => {
       const kinds = events.map((event) => String(event.kind)).toSorted();
       expect(kinds).toEqual(["request", "response"]);
     } finally {
-      globalThis.fetch = originalFetch;
+      globalThis.fetch = proxyReset.originalFetch;
       finalizeDebugProxyCapture();
     }
   });
diff --git a/extensions/openai/tts.test.ts b/extensions/openai/tts.test.ts
index 35153712cd7..2860f57e59b 100644
--- a/extensions/openai/tts.test.ts
+++ b/extensions/openai/tts.test.ts
@@ -1,7 +1,8 @@
 import { mkdtempSync } from "node:fs";
 import os from "node:os";
 import path from "node:path";
-import { afterEach, describe, expect, it, vi } from "vitest";
+import { describe, expect, it, vi } from "vitest";
+import { installDebugProxyTestResetHooks } from "../test-support/debug-proxy-env-test-helpers.js";
 import {
   isValidOpenAIModel,
   isValidOpenAIVoice,
@@ -12,28 +13,7 @@ import {
 } from "./tts.js";
 
 describe("openai tts", () => {
-  const originalFetch = globalThis.fetch;
-  const proxyEnvKeys = [
-    "OPENCLAW_DEBUG_PROXY_ENABLED",
-    "OPENCLAW_DEBUG_PROXY_DB_PATH",
-    "OPENCLAW_DEBUG_PROXY_BLOB_DIR",
-    "OPENCLAW_DEBUG_PROXY_SESSION_ID",
-  ] as const;
-  let priorProxyEnv: Partial<Record<(typeof proxyEnvKeys)[number], string | undefined>> = {};
-
-  afterEach(() => {
-    globalThis.fetch = originalFetch;
-    vi.restoreAllMocks();
-    for (const key of proxyEnvKeys) {
-      const value = priorProxyEnv[key];
-      if (value === undefined) {
-        delete process.env[key];
-      } else {
-        process.env[key] = value;
-      }
-    }
-    priorProxyEnv = {};
-  });
+  const proxyReset = installDebugProxyTestResetHooks();
 
   describe("isValidOpenAIVoice", () => {
     it("accepts all valid OpenAI voices including newer additions", () => {
@@ -205,9 +185,7 @@ describe("openai tts", () => {
 
     it("records TTS exchanges in debug proxy capture mode", async () => {
       const tempDir = mkdtempSync(path.join(os.tmpdir(), "openai-tts-capture-"));
-      priorProxyEnv = Object.fromEntries(
-        proxyEnvKeys.map((key) => [key, process.env[key]]),
-      ) as typeof priorProxyEnv;
+      proxyReset.captureProxyEnv();
       process.env.OPENCLAW_DEBUG_PROXY_ENABLED = "1";
       process.env.OPENCLAW_DEBUG_PROXY_DB_PATH = path.join(tempDir, "capture.sqlite");
       process.env.OPENCLAW_DEBUG_PROXY_BLOB_DIR = path.join(tempDir, "blobs");
@@ -256,9 +234,7 @@ describe("openai tts", () => {
 
     it("does not double-capture TTS exchanges when the global fetch patch is installed", async () => {
       const tempDir = mkdtempSync(path.join(os.tmpdir(), "openai-tts-patched-capture-"));
-      priorProxyEnv = Object.fromEntries(
-        proxyEnvKeys.map((key) => [key, process.env[key]]),
-      ) as typeof priorProxyEnv;
+      proxyReset.captureProxyEnv();
       process.env.OPENCLAW_DEBUG_PROXY_ENABLED = "1";
       process.env.OPENCLAW_DEBUG_PROXY_DB_PATH = path.join(tempDir, "capture.sqlite");
       process.env.OPENCLAW_DEBUG_PROXY_BLOB_DIR = path.join(tempDir, "blobs");
diff --git a/extensions/test-support/debug-proxy-env-test-helpers.ts b/extensions/test-support/debug-proxy-env-test-helpers.ts
new file mode 100644
index 00000000000..895c558ac5f
--- /dev/null
+++ b/extensions/test-support/debug-proxy-env-test-helpers.ts
@@ -0,0 +1,47 @@
+import { afterEach, vi } from "vitest";
+
+export const DEBUG_PROXY_ENV_KEYS = [
+  "OPENCLAW_DEBUG_PROXY_ENABLED",
+  "OPENCLAW_DEBUG_PROXY_DB_PATH",
+  "OPENCLAW_DEBUG_PROXY_BLOB_DIR",
+  "OPENCLAW_DEBUG_PROXY_SESSION_ID",
+] as const;
+
+type DebugProxyEnvKey = (typeof DEBUG_PROXY_ENV_KEYS)[number];
+type DebugProxyEnvSnapshot = Partial<Record<DebugProxyEnvKey, string | undefined>>;
+
+function snapshotDebugProxyEnv(): DebugProxyEnvSnapshot {
+  return Object.fromEntries(
+    DEBUG_PROXY_ENV_KEYS.map((key) => [key, process.env[key]]),
+  ) as DebugProxyEnvSnapshot;
+}
+
+function restoreDebugProxyEnv(snapshot: DebugProxyEnvSnapshot): void {
+  for (const key of DEBUG_PROXY_ENV_KEYS) {
+    const value = snapshot[key];
+    if (value === undefined) {
+      delete process.env[key];
+    } else {
+      process.env[key] = value;
+    }
+  }
+}
+
+export function installDebugProxyTestResetHooks() {
+  const originalFetch = globalThis.fetch;
+  let priorProxyEnv: DebugProxyEnvSnapshot = {};
+
+  afterEach(() => {
+    globalThis.fetch = originalFetch;
+    vi.restoreAllMocks();
+    restoreDebugProxyEnv(priorProxyEnv);
+    priorProxyEnv = {};
+  });
+
+  return {
+    captureProxyEnv() {
+      priorProxyEnv = snapshotDebugProxyEnv();
+    },
+    originalFetch,
+  };
+}