From bf873bb6f692829d9100323743ec91fe267c612a Mon Sep 17 00:00:00 2001
From: gnezim <gnezim@gmail.com>
Date: Fri, 17 Apr 2026 17:30:02 +0300
Subject: [PATCH] Add project .mcp.json to enable Chromium sandbox for
 Playwright MCP

Playwright MCP v0.0.70 defaults to launching Chrome with --no-sandbox
because its sandbox-inference code in playwright-core mcp/config.js
only sets the default when browser.browserName is explicitly 'chromium';
the MCP leaves it undefined, so the default-to-true branch is skipped
and Playwright core pushes --no-sandbox into chromeArguments.

Chrome surfaces this as a yellow warning bar on every Playwright-driven
tab. Setting PLAYWRIGHT_MCP_SANDBOX=true via the MCP server env forces
chromiumSandbox=true, which skips the --no-sandbox push and removes the
warning. The override is scoped to this project; the plugin's own
.mcp.json is unchanged.
---
 .mcp.json | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 .mcp.json

diff --git a/.mcp.json b/.mcp.json
new file mode 100644
index 00000000..013eb3c4
--- /dev/null
+++ b/.mcp.json
@@ -0,0 +1,11 @@
+{
+  "mcpServers": {
+    "playwright": {
+      "command": "npx",
+      "args": ["@playwright/mcp@latest"],
+      "env": {
+        "PLAYWRIGHT_MCP_SANDBOX": "true"
+      }
+    }
+  }
+}