diff --git a/src/plugins/install.test.ts b/src/plugins/install.test.ts
index 6e3b40bd212..442f97c3bfd 100644
--- a/src/plugins/install.test.ts
+++ b/src/plugins/install.test.ts
@@ -1,4 +1,3 @@
-import { randomUUID } from "node:crypto";
 import fs from "node:fs";
 import os from "node:os";
 import path from "node:path";
@@ -18,16 +17,25 @@ vi.mock("../process/exec.js", () => ({
   runCommandWithTimeout: vi.fn(),
 }));
 
-const tempDirs: string[] = [];
 let installPluginFromArchive: typeof import("./install.js").installPluginFromArchive;
 let installPluginFromDir: typeof import("./install.js").installPluginFromDir;
 let installPluginFromNpmSpec: typeof import("./install.js").installPluginFromNpmSpec;
 let runCommandWithTimeout: typeof import("../process/exec.js").runCommandWithTimeout;
+let suiteTempRoot = "";
+let tempDirCounter = 0;
+
+function ensureSuiteTempRoot() {
+  if (suiteTempRoot) {
+    return suiteTempRoot;
+  }
+  suiteTempRoot = fs.mkdtempSync(path.join(os.tmpdir(), "openclaw-plugin-install-"));
+  return suiteTempRoot;
+}
 
 function makeTempDir() {
-  const dir = path.join(os.tmpdir(), `openclaw-plugin-install-${randomUUID()}`);
+  const dir = path.join(ensureSuiteTempRoot(), `case-${String(tempDirCounter)}`);
+  tempDirCounter += 1;
   fs.mkdirSync(dir, { recursive: true });
-  tempDirs.push(dir);
   return dir;
 }
 
@@ -288,12 +296,14 @@ async function installArchivePackageAndReturnResult(params: {
 }
 
 afterAll(() => {
-  for (const dir of tempDirs.splice(0)) {
-    try {
-      fs.rmSync(dir, { recursive: true, force: true });
-    } catch {
-      // ignore cleanup failures
-    }
+  if (!suiteTempRoot) {
+    return;
+  }
+  try {
+    fs.rmSync(suiteTempRoot, { recursive: true, force: true });
+  } finally {
+    suiteTempRoot = "";
+    tempDirCounter = 0;
   }
 });