diff --git a/src/main/agent-hooks/managed-hook-stdin-lifecycle.test.ts b/src/main/agent-hooks/managed-hook-stdin-lifecycle.test.ts
index 39639a36b49..352a54d76bd 100644
--- a/src/main/agent-hooks/managed-hook-stdin-lifecycle.test.ts
+++ b/src/main/agent-hooks/managed-hook-stdin-lifecycle.test.ts
@@ -1,6 +1,6 @@
 // Why: stdin ownership is a cross-agent process contract; one executable
 // matrix catches an unread early exit without duplicating template assertions.
-import { describe, expect, it, vi } from 'vitest'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { spawn } from 'node:child_process'
 import { mkdtempSync, readFileSync, readdirSync, rmSync } from 'node:fs'
 import { tmpdir } from 'node:os'
@@ -47,6 +47,25 @@ import { createAgentHookMemorySftp } from './agent-hook-memory-sftp.test-fixture
 
 const REMOTE_HOME = '/home/dev'
 const LARGE_PAYLOAD = Buffer.alloc(1_000_000, 'x')
+let isolatedUserDataDir = ''
+let previousUserDataPath: string | undefined
+
+beforeEach(() => {
+  previousUserDataPath = process.env.ORCA_USER_DATA_PATH
+  isolatedUserDataDir = mkdtempSync(join(tmpdir(), 'orca-hook-stdin-user-data-'))
+  // Why: Orca-managed Codex hooks resolve through ORCA_USER_DATA_PATH before
+  // the mocked home; an inherited live path would let this test rewrite them.
+  process.env.ORCA_USER_DATA_PATH = isolatedUserDataDir
+})
+
+afterEach(() => {
+  if (previousUserDataPath === undefined) {
+    delete process.env.ORCA_USER_DATA_PATH
+  } else {
+    process.env.ORCA_USER_DATA_PATH = previousUserDataPath
+  }
+  rmSync(isolatedUserDataDir, { recursive: true, force: true })
+})
 const REMOTE_INSTALLERS = [
   {
     agent: 'antigravity',
@@ -200,6 +219,9 @@ describe('Windows managed hook stdin structure', () => {
           expect(entry.install().state, `${entry.agent} install status`).toBe('installed')
         }
       })
+      expect(
+        readFileSync(join(isolatedUserDataDir, 'codex-runtime-home', 'home', 'hooks.json'), 'utf8')
+      ).toContain('WindowsPowerShell')
       const hooksDir = join(home, '.orca', 'agent-hooks')
       const fileNames = readdirSync(hooksDir)
       const mainBatchScripts = fileNames.filter(