[BUG] Playwright plugin ignores .mcp.json args — hardcodes --headless only

Bug Description

When the Playwright MCP plugin is installed via the Claude Code plugin marketplace, Claude Code hardcodes the launch command as:

\\\
npm exec @playwright/mcp@latest --headless
\\\

It ignores the \args\ array defined in the plugin's \.mcp.json\ file. Any additional arguments added to the config (e.g. \--ignore-https-errors\) are silently dropped.

Environment

• OS: Linux 6.17.0-14-generic
• Claude Code Version: latest
• Plugin: \playwright@claude-plugins-official\

Steps to Reproduce

1. Install the Playwright plugin from the official Claude Code marketplace
2. Edit \~/.claude/plugins/marketplaces/claude-plugins-official/external_plugins/playwright/.mcp.json\ to add an extra arg:

\\\json
{
"playwright": {
"command": "npx",
"args": ["@playwright/mcp@latest", "--ignore-https-errors"]
}
}
\\\

1. Restart Claude Code
2. Check the running process: \ps aux | grep playwright-mcp\

Expected Behaviour

The MCP server should launch with all args from the config:
\\\
npm exec @playwright/mcp@latest --headless --ignore-https-errors
\\\

Actual Behaviour

The process launches with only \--headless\, ignoring the extra arg:
\\\
npm exec @playwright/mcp@latest --headless
\\\

Impact

There is no supported way to pass additional flags to the Playwright MCP server when using the plugin. Workarounds like \settings.json\ \mcpServers\ or \pluginConfigs\ do not apply to plugin-managed MCP servers. This makes it impossible to use Playwright MCP with self-signed TLS certificates in local development environments (requires \--ignore-https-errors\).