diff --git a/scripts/e2e/parallels/host-server.ts b/scripts/e2e/parallels/host-server.ts
index 31ea1946e19a..1c84edb6670c 100644
--- a/scripts/e2e/parallels/host-server.ts
+++ b/scripts/e2e/parallels/host-server.ts
@@ -81,20 +81,54 @@ export async function startHostServer(input: {
     hostIp: input.hostIp,
     port: actualPort,
     stop: async () => {
-      child.kill("SIGTERM");
-      await new Promise<void>((resolve) => {
-        child.once("exit", () => resolve());
-        setTimeout(() => {
-          child.kill("SIGKILL");
-          resolve();
-        }, 2_000).unref();
-      });
+      await stopHostServerChild(child);
     },
     urlFor: (filePath) =>
       `http://${input.hostIp}:${actualPort}/${encodeURIComponent(path.basename(filePath))}`,
   };
 }
 
+async function stopHostServerChild(
+  child: ChildProcessWithoutNullStreams,
+  terminateTimeoutMs = 2_000,
+  killTimeoutMs = 1_500,
+): Promise<boolean> {
+  if (child.exitCode != null) {
+    return true;
+  }
+  child.kill("SIGTERM");
+  if (await waitForChildExit(child, terminateTimeoutMs)) {
+    return true;
+  }
+  child.kill("SIGKILL");
+  return await waitForChildExit(child, killTimeoutMs);
+}
+
+async function waitForChildExit(
+  child: ChildProcessWithoutNullStreams,
+  timeoutMs: number,
+): Promise<boolean> {
+  if (child.exitCode != null) {
+    return true;
+  }
+  return await new Promise<boolean>((resolve) => {
+    let settled = false;
+    const onExit = () => settle(true);
+    const timeout = setTimeout(() => settle(child.exitCode != null), timeoutMs);
+    timeout.unref();
+    function settle(exited: boolean): void {
+      if (settled) {
+        return;
+      }
+      settled = true;
+      clearTimeout(timeout);
+      child.off("exit", onExit);
+      resolve(exited);
+    }
+    child.once("exit", onExit);
+  });
+}
+
 async function waitForHostServer(
   child: ChildProcessWithoutNullStreams,
   port: number,
@@ -160,4 +194,5 @@ async function delay(ms: number): Promise<void> {
 
 export const testing = {
   appendBoundedOutput,
+  stopHostServerChild,
 };
diff --git a/scripts/e2e/parallels/provider-auth.ts b/scripts/e2e/parallels/provider-auth.ts
index 885a683d8736..e9c08f4fd20e 100644
--- a/scripts/e2e/parallels/provider-auth.ts
+++ b/scripts/e2e/parallels/provider-auth.ts
@@ -1,10 +1,18 @@
-import { mkdtempSync } from "node:fs";
+import { mkdtempSync, rmSync, writeFileSync } from "node:fs";
 import { tmpdir } from "node:os";
 import path from "node:path";
 import { parsePositiveInt, readPositiveIntEnv } from "./env-limits.ts";
 import { die, run } from "./host-command.ts";
 import type { Mode, Platform, Provider, ProviderAuth } from "./types.ts";
 
+type ResolveLatestVersionDeps = {
+  createTempDir?: typeof mkdtempSync;
+  removeDir?: typeof rmSync;
+  runCommand?: typeof run;
+  tempDir?: typeof tmpdir;
+  writeFile?: typeof writeFileSync;
+};
+
 export function parseBoolEnv(value: string | undefined): boolean {
   return /^(1|true|yes|on)$/i.test(value ?? "");
 }
@@ -192,21 +200,26 @@ export function parsePlatformList(value: string): Set<Platform> {
   return result;
 }
 
-export function resolveLatestVersion(versionOverride = ""): string {
+export function resolveLatestVersion(
+  versionOverride = "",
+  deps: ResolveLatestVersionDeps = {},
+): string {
   if (versionOverride) {
     return versionOverride;
   }
-  return run(
-    "npm",
-    [
-      "view",
-      "openclaw",
-      "version",
-      "--userconfig",
-      mkdtempSync(path.join(tmpdir(), "openclaw-npm-")),
-    ],
-    {
+  const createTempDir = deps.createTempDir ?? mkdtempSync;
+  const removeDir = deps.removeDir ?? rmSync;
+  const runCommand = deps.runCommand ?? run;
+  const resolveTempDir = deps.tempDir ?? tmpdir;
+  const writeFile = deps.writeFile ?? writeFileSync;
+  const userConfigDir = createTempDir(path.join(resolveTempDir(), "openclaw-npm-"));
+  const userConfigPath = path.join(userConfigDir, "npmrc");
+  try {
+    writeFile(userConfigPath, "", "utf8");
+    return runCommand("npm", ["view", "openclaw", "version", "--userconfig", userConfigPath], {
       quiet: true,
-    },
-  ).stdout.trim();
+    }).stdout.trim();
+  } finally {
+    removeDir(userConfigDir, { force: true, recursive: true });
+  }
 }
diff --git a/test/scripts/parallels-smoke-model.test.ts b/test/scripts/parallels-smoke-model.test.ts
index 8e8b710492ad..6a6f863ede1f 100644
--- a/test/scripts/parallels-smoke-model.test.ts
+++ b/test/scripts/parallels-smoke-model.test.ts
@@ -1,13 +1,24 @@
-import { chmodSync, copyFileSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
+import { EventEmitter } from "node:events";
+import {
+  chmodSync,
+  copyFileSync,
+  existsSync,
+  mkdtempSync,
+  readFileSync,
+  rmSync,
+  statSync,
+  writeFileSync,
+} from "node:fs";
 import { createServer } from "node:net";
 import { tmpdir } from "node:os";
-import { delimiter, join, win32 } from "node:path";
+import { basename, delimiter, join, win32 } from "node:path";
 import { setTimeout as delay } from "node:timers/promises";
 import { pathToFileURL } from "node:url";
 import { beforeAll, describe, expect, it, vi } from "vitest";
 import {
   modelProviderConfigBatchJson,
   readPositiveIntEnv,
+  resolveLatestVersion,
   resolveParallelsModelTimeoutSeconds,
   resolveProviderAuth as resolveProviderAuthDirect,
   resolveSnapshot,
@@ -84,6 +95,21 @@ function writeFakePrlctl(tempDir: string, posixScript: string, windowsBootstrap:
   writeFileSync(join(tempDir, "prlctl-bootstrap.mjs"), windowsBootstrap);
 }
 
+class FakeHostServerChild extends EventEmitter {
+  exitCode: number | null = null;
+  readonly signals: string[] = [];
+
+  kill(signal?: NodeJS.Signals | number): boolean {
+    this.signals.push(String(signal));
+    return true;
+  }
+
+  exit(): void {
+    this.exitCode = 0;
+    this.emit("exit", 0, null);
+  }
+}
+
 function withEnv<T>(env: Record<string, string>, callback: () => T): T {
   const previous = new Map<string, string | undefined>();
   for (const [key, _value] of Object.entries(env)) {
@@ -286,6 +312,58 @@ describe("Parallels smoke model selection", () => {
     expect(retained).toBe(`${"a".repeat(2)}${"b".repeat(10)}`);
   });
 
+  it("waits for host artifact server exit after SIGKILL before stop resolves", async () => {
+    vi.useFakeTimers();
+    try {
+      const child = new FakeHostServerChild();
+      const stop = hostServerTesting.stopHostServerChild(child as never, 100, 100);
+      expect(child.signals).toEqual(["SIGTERM"]);
+
+      await vi.advanceTimersByTimeAsync(100);
+      expect(child.signals).toEqual(["SIGTERM", "SIGKILL"]);
+
+      let resolved = false;
+      void stop.then(() => {
+        resolved = true;
+      });
+      await Promise.resolve();
+      expect(resolved).toBe(false);
+
+      child.exit();
+      await expect(stop).resolves.toBe(true);
+      expect(resolved).toBe(true);
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it("uses a temporary npmrc file and cleans it after resolving the latest package version", () => {
+    const tempRoot = mkdtempSync(join(tmpdir(), "openclaw-parallels-version-"));
+    let userConfigPath = "";
+    try {
+      const version = resolveLatestVersion("", {
+        createTempDir: (prefix) => {
+          expect(prefix).toBe(join(tmpdir(), "openclaw-npm-"));
+          return mkdtempSync(join(tempRoot, "npm-"));
+        },
+        runCommand: (command, args, options) => {
+          userConfigPath = args.at(-1) ?? "";
+          expect(command).toBe("npm");
+          expect(args).toEqual(["view", "openclaw", "version", "--userconfig", userConfigPath]);
+          expect(options).toEqual({ quiet: true });
+          expect(statSync(userConfigPath).isFile()).toBe(true);
+          return { status: 0, stderr: "", stdout: "2026.6.1\n" };
+        },
+      });
+
+      expect(version).toBe("2026.6.1");
+      expect(basename(userConfigPath)).toBe("npmrc");
+      expect(existsSync(userConfigPath)).toBe(false);
+    } finally {
+      rmSync(tempRoot, { force: true, recursive: true });
+    }
+  });
+
   it.runIf(process.platform !== "win32")(
     "reports only the bounded host artifact server stderr tail",
     async () => {