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feat(mcp): default Patchright backend for Playwright MCP #1265

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feat(mcp): default Patchright backend for Playwright MCP #1265

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8 changes: 3 additions & 5 deletions mcp/mcp.json
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@@ -1,13 +1,11 @@
{
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@amazon-q-developer amazon-q-developer Bot Sep 2, 2025

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Consider adding a version field to the configuration to help with future compatibility checks and migrations.

"mcpServers": {
"playwright": {
"command": "npx",
"args": [
"@playwright/mcp@latest"
],
"command": "patchright-playwright-mcp",
"args": [],
"env": {
"FASTMCP_LOG_LEVEL": "ERROR"
}
}
}
}
}
4 changes: 4 additions & 0 deletions mcp/patchright-shim/node_modules/playwright/index.js
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19 changes: 19 additions & 0 deletions mcp/servers/patchright-playwright-mcp
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#!/usr/bin/env bash
set -euo pipefail

# Wrapper to run @playwright/mcp with Patchright as the default backend.
# Opt out by setting USE_PATCHRIGHT=0 or USE_PATCHRIGHT=false

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# mcp/servers -> repo root is ../..
DOT_DEN="$(cd "$SCRIPT_DIR/../.." && pwd)"

USE_PATCHRIGHT_VAL="${USE_PATCHRIGHT:-1}"
if [[ "$USE_PATCHRIGHT_VAL" != "0" && "$USE_PATCHRIGHT_VAL" != "false" ]]; then
# Prepend shim node_modules so require('playwright') resolves to Patchright
export NODE_PATH="${DOT_DEN}/mcp/patchright-shim/node_modules${NODE_PATH:+:$NODE_PATH}"
fi

# Execute the community Playwright MCP server
exec npx @playwright/mcp@latest "$@"

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@amazon-q-developer amazon-q-developer Bot Sep 2, 2025

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🛑 [Security Concern]: The script is using exec with "$@" which could potentially allow command injection if not properly sanitized1. Consider adding input validation for the arguments before passing them to exec.

Footnotes

  1. CWE-78: OS Command Injection - https://cwe.mitre.org/data/definitions/78.html ↩

19 changes: 19 additions & 0 deletions mcp/setup-patchright-shim.sh
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#!/usr/bin/env bash
set -euo pipefail

# Install Patchright into the local shim so Playwright resolves to Patchright

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
SHIM_DIR="$SCRIPT_DIR/patchright-shim"

mkdir -p "$SHIM_DIR"

if [[ ! -f "$SHIM_DIR/package.json" ]]; then
(cd "$SHIM_DIR" && npm init -y >/dev/null 2>&1)
fi

echo "Installing patchright into $SHIM_DIR ..."
(cd "$SHIM_DIR" && npm install patchright --silent)
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@amazon-q-developer amazon-q-developer Bot Sep 2, 2025

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Consider adding error handling for the npm install command to provide more informative error messages if the installation fails.


echo "Patchright shim ready. Optional: download Chromium once with:\n npx patchright install chromium"