diff --git a/extensions/qa-lab/src/qa-agent-workspace.test.ts b/extensions/qa-lab/src/qa-agent-workspace.test.ts
index 6e78c02f265..0f48dd9aeda 100644
--- a/extensions/qa-lab/src/qa-agent-workspace.test.ts
+++ b/extensions/qa-lab/src/qa-agent-workspace.test.ts
@@ -1,20 +1,12 @@
 import fs from "node:fs/promises";
-import os from "node:os";
 import path from "node:path";
 import { afterEach, describe, expect, it } from "vitest";
 import { seedQaAgentWorkspace } from "./qa-agent-workspace.js";
+import { createTempDirHarness } from "./temp-dir.test-helper.js";
 
-const tempDirs: string[] = [];
+const { cleanup, makeTempDir } = createTempDirHarness();
 
-async function makeTempDir(prefix: string) {
-  const dir = await fs.mkdtemp(path.join(os.tmpdir(), prefix));
-  tempDirs.push(dir);
-  return dir;
-}
-
-afterEach(async () => {
-  await Promise.all(tempDirs.splice(0).map((dir) => fs.rm(dir, { recursive: true, force: true })));
-});
+afterEach(cleanup);
 
 describe("seedQaAgentWorkspace", () => {
   it("creates a repo symlink when a repo root is provided", async () => {
diff --git a/extensions/qa-lab/src/suite-runtime-agent-media.test.ts b/extensions/qa-lab/src/suite-runtime-agent-media.test.ts
index a57f502e76e..ca379e4ea92 100644
--- a/extensions/qa-lab/src/suite-runtime-agent-media.test.ts
+++ b/extensions/qa-lab/src/suite-runtime-agent-media.test.ts
@@ -1,5 +1,4 @@
 import fs from "node:fs/promises";
-import os from "node:os";
 import path from "node:path";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 
@@ -20,18 +19,11 @@ import {
   extractMediaPathFromText,
   resolveGeneratedImagePath,
 } from "./suite-runtime-agent-media.js";
+import { createTempDirHarness } from "./temp-dir.test-helper.js";
 
-const tempDirs: string[] = [];
+const { cleanup, makeTempDir } = createTempDirHarness();
 
-async function makeTempDir(prefix: string) {
-  const dir = await fs.mkdtemp(path.join(os.tmpdir(), prefix));
-  tempDirs.push(dir);
-  return dir;
-}
-
-afterEach(async () => {
-  await Promise.all(tempDirs.splice(0).map((dir) => fs.rm(dir, { recursive: true, force: true })));
-});
+afterEach(cleanup);
 
 describe("qa suite runtime agent media helpers", () => {
   beforeEach(() => {
diff --git a/extensions/qa-lab/src/suite-runtime-agent-session.test.ts b/extensions/qa-lab/src/suite-runtime-agent-session.test.ts
index b63cf8718bd..5bd1af6a0c6 100644
--- a/extensions/qa-lab/src/suite-runtime-agent-session.test.ts
+++ b/extensions/qa-lab/src/suite-runtime-agent-session.test.ts
@@ -1,5 +1,4 @@
 import fs from "node:fs/promises";
-import os from "node:os";
 import path from "node:path";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import {
@@ -8,18 +7,11 @@ import {
   readRawQaSessionStore,
   readSkillStatus,
 } from "./suite-runtime-agent-session.js";
+import { createTempDirHarness } from "./temp-dir.test-helper.js";
 
-const tempDirs: string[] = [];
+const { cleanup, makeTempDir } = createTempDirHarness();
 
-async function makeTempDir(prefix: string) {
-  const dir = await fs.mkdtemp(path.join(os.tmpdir(), prefix));
-  tempDirs.push(dir);
-  return dir;
-}
-
-afterEach(async () => {
-  await Promise.all(tempDirs.splice(0).map((dir) => fs.rm(dir, { recursive: true, force: true })));
-});
+afterEach(cleanup);
 
 describe("qa suite runtime agent session helpers", () => {
   const gatewayCall = vi.fn();
diff --git a/extensions/qa-lab/src/suite-runtime-agent-tools.test.ts b/extensions/qa-lab/src/suite-runtime-agent-tools.test.ts
index db0e8799771..efb969ce383 100644
--- a/extensions/qa-lab/src/suite-runtime-agent-tools.test.ts
+++ b/extensions/qa-lab/src/suite-runtime-agent-tools.test.ts
@@ -1,5 +1,4 @@
 import fs from "node:fs/promises";
-import os from "node:os";
 import path from "node:path";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 
@@ -49,18 +48,11 @@ import {
   handleQaAction,
   writeWorkspaceSkill,
 } from "./suite-runtime-agent-tools.js";
+import { createTempDirHarness } from "./temp-dir.test-helper.js";
 
-const tempDirs: string[] = [];
+const { cleanup, makeTempDir } = createTempDirHarness();
 
-async function makeTempDir(prefix: string) {
-  const dir = await fs.mkdtemp(path.join(os.tmpdir(), prefix));
-  tempDirs.push(dir);
-  return dir;
-}
-
-afterEach(async () => {
-  await Promise.all(tempDirs.splice(0).map((dir) => fs.rm(dir, { recursive: true, force: true })));
-});
+afterEach(cleanup);
 
 describe("qa suite runtime agent tools helpers", () => {
   beforeEach(() => {
diff --git a/extensions/qa-lab/src/temp-dir.test-helper.ts b/extensions/qa-lab/src/temp-dir.test-helper.ts
new file mode 100644
index 00000000000..cf1bd93309c
--- /dev/null
+++ b/extensions/qa-lab/src/temp-dir.test-helper.ts
@@ -0,0 +1,20 @@
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+
+export function createTempDirHarness() {
+  const tempDirs: string[] = [];
+
+  return {
+    async cleanup() {
+      await Promise.all(
+        tempDirs.splice(0).map((dir) => fs.rm(dir, { recursive: true, force: true })),
+      );
+    },
+    async makeTempDir(prefix: string) {
+      const dir = await fs.mkdtemp(path.join(os.tmpdir(), prefix));
+      tempDirs.push(dir);
+      return dir;
+    },
+  };
+}