ProvarTesting · mrdailey99 · Apr 17, 2026 · Apr 13, 2026 · Apr 15, 2026 · Apr 15, 2026
diff --git a/README.md b/README.md
@@ -42,7 +42,7 @@ Validation runs in two modes: **local only** (structural rules, no key required)
 **Requires:** Provar Automation IDE installed with an activated license.
 
 ```sh
-# 1. Install the plugin (if not already installed)
+# 1. Install the plugin — @beta is required for MCP support
 sf plugins install @provartesting/provardx-cli@beta
 
 # 2. (Optional) Authenticate for full 170+ rule validation

diff --git a/docs/mcp.md b/docs/mcp.md
@@ -66,7 +66,7 @@ The Provar DX CLI ships with a built-in **Model Context Protocol (MCP) server**
 ## Quick start
 
 ```sh
-# 1. Install the plugin
+# 1. Install the plugin — @beta is required for MCP support
 sf plugins install @provartesting/provardx-cli@beta
 
 # 2. (Optional) Authenticate for full 170+ rule validation

diff --git a/package.json b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@provartesting/provardx-cli",
   "description": "A plugin for the Salesforce CLI to orchestrate testing activities and report quality metrics to Provar Quality Hub",
-  "version": "1.5.0-beta.4",
+  "version": "1.5.0-beta.5",
   "license": "BSD-3-Clause",
   "plugins": [
     "@provartesting/provardx-plugins-automation",

diff --git a/src/services/auth/loginFlow.ts b/src/services/auth/loginFlow.ts
@@ -9,7 +9,7 @@
 import crypto from 'node:crypto';
 import http from 'node:http';
 import https from 'node:https';
-import { execFile } from 'node:child_process';
+import { spawn, type ChildProcess } from 'node:child_process';
 import { URL } from 'node:url';
 
 // All three ports must be pre-registered in the Cognito App Client.
@@ -76,21 +76,35 @@ function isPortFree(port: number): Promise<boolean> {
  * Open a URL in the system browser. The URL is passed as an argument — not
  * interpolated into a shell string — to avoid command injection.
  */
-export function openBrowser(url: string): void {
-  switch (process.platform) {
+/**
+ * Return the platform-specific command and argument list for opening a URL
+ * in the system browser. Exported so tests can assert the correct command is
+ * chosen for each platform without actually spawning a process.
+ */
+export function getBrowserCommand(url: string, platform: NodeJS.Platform = process.platform): { cmd: string; args: string[] } {
+  switch (platform) {
     case 'darwin':
-      execFile('open', [url]);
-      break;
+      return { cmd: 'open', args: [url] };
     case 'win32':
       // Pass the URL via $args[0] so it is never interpolated into the -Command
       // string — avoids quote-breaking and injection risk from special characters.
-      execFile('powershell.exe', ['-NoProfile', '-Command', 'Start-Process $args[0]', '-args', url]);
-      break;
+      return { cmd: 'powershell.exe', args: ['-NoProfile', '-Command', 'Start-Process $args[0]', '-args', url] };
     default:
-      execFile('xdg-open', [url]);
+      return { cmd: 'xdg-open', args: [url] };
   }
 }
 
+export function openBrowser(url: string): void {
+  // detached:true + stdio:'ignore' + unref() is the standard Node.js pattern for
+  // fire-and-forget child processes — the event loop will not wait for them to exit.
+  const { cmd, args } = getBrowserCommand(url);
+  const child: ChildProcess = spawn(cmd, args, { detached: true, stdio: 'ignore' });
+  // Suppress unhandled-error crashes if the browser executable is not found.
+  // The login URL is already printed to the terminal so the user can open it manually.
+  child.on('error', () => { /* intentional no-op */ });
+  child.unref();
+}
+
 // ── Localhost callback server ─────────────────────────────────────────────────
 
 /**
@@ -107,26 +121,33 @@ export function listenForCallback(port: number, expectedState?: string): Promise
       const callbackState = parsed.searchParams.get('state');
 
       if (expectedState && callbackState !== expectedState) {
-        res.writeHead(400, { 'Content-Type': 'text/html; charset=utf-8' });
+        res.writeHead(400, { 'Content-Type': 'text/html; charset=utf-8', Connection: 'close' });
         res.end(
           '<html><body style="font-family:sans-serif;padding:2rem;max-width:480px">' +
             '<h2 style="color:#c23934">Authentication failed</h2>' +
             '<p>Invalid state parameter — possible CSRF attack. Please try again.</p>' +
             '</body></html>'
         );
         server.close();
+        server.closeAllConnections?.();
         reject(new Error('OAuth callback state mismatch — possible CSRF. Try again.'));
         return;
       }
 
-      res.writeHead(200, { 'Content-Type': 'text/html; charset=utf-8' });
+      // 'Connection: close' tells the browser to close the TCP connection after
+      // this response so server.close() has no lingering keep-alive sockets to
+      // wait for, allowing the Node.js event loop to exit promptly.
+      res.writeHead(200, { 'Content-Type': 'text/html; charset=utf-8', Connection: 'close' });
       res.end(
         '<html><body style="font-family:sans-serif;padding:2rem;max-width:480px">' +
           '<h2 style="color:#0070d2">Authentication complete</h2>' +
           '<p>You can close this tab and return to the terminal.</p>' +
           '</body></html>'
       );
       server.close();
+      // Destroy any sockets that are still open (e.g. a browser that ignores
+      // the Connection:close header). Requires Node 18.2+.
+      server.closeAllConnections?.();
 
       if (code) {
         resolve(code);

diff --git a/test/unit/commands/provar/auth/login.test.ts b/test/unit/commands/provar/auth/login.test.ts
@@ -15,6 +15,7 @@ import { describe, it, beforeEach, afterEach } from 'mocha';
 import sinon from 'sinon';
 import {
   generatePkce,
+  getBrowserCommand,
   loginFlowClient,
   type CognitoTokens,
   CALLBACK_PORTS,
@@ -59,6 +60,45 @@ function restoreHome(): void {
   fs.rmSync(tempDir, { recursive: true, force: true });
 }
 
+// ── getBrowserCommand ─────────────────────────────────────────────────────────
+
+describe('getBrowserCommand', () => {
+  const url = 'https://example.com/login?code=abc&state=xyz';
+
+  it('uses "open" on macOS', () => {
+    const { cmd, args } = getBrowserCommand(url, 'darwin');
+    assert.equal(cmd, 'open');
+    assert.deepEqual(args, [url]);
+  });
+
+  it('uses powershell.exe with Start-Process on Windows', () => {
+    const { cmd, args } = getBrowserCommand(url, 'win32');
+    assert.equal(cmd, 'powershell.exe');
+    assert.ok(args.includes('-NoProfile'), 'should pass -NoProfile');
+    assert.ok(args.includes('Start-Process $args[0]') || args.join(' ').includes('Start-Process'), 'should use Start-Process');
+    // URL is passed as a separate arg — never interpolated into the command string
+    assert.equal(args[args.length - 1], url, 'URL must be the last argument');
+  });
+
+  it('uses "xdg-open" on Linux', () => {
+    const { cmd, args } = getBrowserCommand(url, 'linux');
+    assert.equal(cmd, 'xdg-open');
+    assert.deepEqual(args, [url]);
+  });
+
+  it('uses "xdg-open" for unknown platforms', () => {
+    const { cmd } = getBrowserCommand(url, 'freebsd');
+    assert.equal(cmd, 'xdg-open');
+  });
+
+  it('includes the full URL in args for all platforms', () => {
+    for (const platform of ['darwin', 'win32', 'linux'] as NodeJS.Platform[]) {
+      const { args } = getBrowserCommand(url, platform);
+      assert.ok(args.includes(url), `URL must appear in args for platform ${platform}`);
+    }
+  });
+});
+
 // ── generatePkce ──────────────────────────────────────────────────────────────
 
 describe('generatePkce', () => {