diff --git a/extensions/memory-core/src/memory/temporal-decay.test.ts b/extensions/memory-core/src/memory/temporal-decay.test.ts
index edb4df553d6..d1661ce482d 100644
--- a/extensions/memory-core/src/memory/temporal-decay.test.ts
+++ b/extensions/memory-core/src/memory/temporal-decay.test.ts
@@ -1,7 +1,7 @@
 import fs from "node:fs/promises";
-import os from "node:os";
 import path from "node:path";
-import { afterEach, describe, expect, it } from "vitest";
+import { describe, expect, it } from "vitest";
+import { createMemoryCoreTestHarness } from "../test-helpers.js";
 import { mergeHybridResults } from "./hybrid.js";
 import {
   applyTemporalDecayToHybridResults,
@@ -11,14 +11,7 @@ import {
 
 const DAY_MS = 24 * 60 * 60 * 1000;
 const NOW_MS = Date.UTC(2026, 1, 10, 0, 0, 0);
-
-const tempDirs: string[] = [];
-
-async function makeTempDir(): Promise<string> {
-  const dir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-temporal-decay-"));
-  tempDirs.push(dir);
-  return dir;
-}
+const { createTempWorkspace } = createMemoryCoreTestHarness();
 
 function createVectorMemoryEntry(params: {
   id: string;
@@ -51,14 +44,6 @@ async function mergeVectorResultsWithTemporalDecay(
   });
 }
 
-afterEach(async () => {
-  await Promise.all(
-    tempDirs.splice(0).map(async (dir) => {
-      await fs.rm(dir, { recursive: true, force: true });
-    }),
-  );
-});
-
 describe("temporal decay", () => {
   it("matches exponential decay formula", () => {
     const halfLifeDays = 30;
@@ -79,7 +64,7 @@ describe("temporal decay", () => {
   });
 
   it("does not decay evergreen memory files", async () => {
-    const dir = await makeTempDir();
+    const dir = await createTempWorkspace("openclaw-temporal-decay-");
 
     const rootMemoryPath = path.join(dir, "MEMORY.md");
     const topicPath = path.join(dir, "memory", "projects.md");
@@ -154,7 +139,7 @@ describe("temporal decay", () => {
   });
 
   it("uses file mtime fallback for non-memory sources", async () => {
-    const dir = await makeTempDir();
+    const dir = await createTempWorkspace("openclaw-temporal-decay-");
     const sessionPath = path.join(dir, "sessions", "thread.jsonl");
     await fs.mkdir(path.dirname(sessionPath), { recursive: true });
     await fs.writeFile(sessionPath, "{}\n");
diff --git a/extensions/memory-core/src/tools.citations.test.ts b/extensions/memory-core/src/tools.citations.test.ts
index 983ef66cf04..c2bce446936 100644
--- a/extensions/memory-core/src/tools.citations.test.ts
+++ b/extensions/memory-core/src/tools.citations.test.ts
@@ -1,5 +1,4 @@
 import fs from "node:fs/promises";
-import os from "node:os";
 import path from "node:path";
 import { beforeEach, describe, expect, it } from "vitest";
 import {
@@ -16,6 +15,7 @@ import {
   setMemoryWorkspaceDir,
   type MemoryReadParams,
 } from "../../../test/helpers/memory-tool-manager-mock.js";
+import { createMemoryCoreTestHarness } from "./test-helpers.js";
 import {
   asOpenClawConfig,
   createAutoCitationsMemorySearchTool,
@@ -25,6 +25,8 @@ import {
   expectUnavailableMemorySearchDetails,
 } from "./tools.test-helpers.js";
 
+const { createTempWorkspace } = createMemoryCoreTestHarness();
+
 async function waitFor<T>(task: () => Promise<T>, timeoutMs: number = 1500): Promise<T> {
   const startedAt = Date.now();
   let lastError: unknown;
@@ -180,7 +182,7 @@ describe("memory tools", () => {
   });
 
   it("persists short-term recall events from memory_search tool hits", async () => {
-    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "memory-tools-recall-"));
+    const workspaceDir = await createTempWorkspace("memory-tools-recall-");
     try {
       setMemoryBackend("builtin");
       setMemoryWorkspaceDir(workspaceDir);