From 871d863a4c3171f201136fd6653a46924b138664 Mon Sep 17 00:00:00 2001
From: Abhishek Gadekar <abhishekg@lambdatest.com>
Date: Thu, 18 Jun 2026 17:22:24 +0530
Subject: [PATCH] fix(mcp): create a context when remote browser has none

Connecting to a remote browser via --endpoint forces isolated=false, so
the server takes the browser.contexts()[0] branch. A browserType.connect()-ed
browser has no contexts, so contexts()[0] is undefined and BrowserBackend
crashes on the first tool call with "Cannot read properties of undefined
(reading 'once')". Create a context when none exists.
---
 packages/playwright-core/src/tools/mcp/program.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/playwright-core/src/tools/mcp/program.ts b/packages/playwright-core/src/tools/mcp/program.ts
index e29d72fed016c..e3435a6d9b89c 100644
--- a/packages/playwright-core/src/tools/mcp/program.ts
+++ b/packages/playwright-core/src/tools/mcp/program.ts
@@ -127,7 +127,7 @@ export function decorateMCPCommand(command: Command) {
               const sessionName = count > 1 ? `${clientInfo.clientName} (${count})` : clientInfo.clientName;
               await browser.bind(sessionName, { workspaceDir: clientInfo.cwd });
             }
-            const browserContext = config.browser.isolated ? await browser.newContext(config.browser.contextOptions) : browser.contexts()[0];
+            const browserContext = config.browser.isolated || !browser.contexts().length ? await browser.newContext(config.browser.contextOptions) : browser.contexts()[0];
             return new BrowserBackend(config, browserContext, tools);
           },
           disposed: async backend => {