Frequently Asked Questions about Playwright MCP Server

Q: What is Playwright MCP Server?

A: Playwright MCP (Model Context Protocol) Server is a server that uses Playwright to provide browser automation capabilities. It allows LLMs (Large Language Models) to interact with web pages using structured accessibility snapshots instead of relying on visual models or screenshots.

Q: What are the key benefits of using Playwright MCP Server?

A: Key benefits include:

• Fast and lightweight operation using Playwright’s accessibility tree.
• LLM-friendly design, eliminating the need for vision models.
• Deterministic tool application, reducing ambiguity.

Q: What are the system requirements for running Playwright MCP Server?

A: The server requires Node.js 18 or newer and an MCP client such as VS Code, Cursor, Windsurf, or Claude Desktop.

Q: How do I install Playwright MCP Server?

A: You can install it via npm (Node Package Manager) and configure it within your MCP client. For example, in VS Code, you can add a configuration like this:

{ “mcpServers”: { “playwright”: { “command”: “npx”, “args”: [ “@playwright/mcp@latest” ] } } }

Q: What is the difference between Snapshot Mode and Vision Mode?

A: Snapshot Mode (default) uses accessibility snapshots for better performance and reliability. Vision Mode uses screenshots for visual-based interactions. Vision Mode is enabled with the --vision flag.

Q: What types of tools are available in Playwright MCP Server?

A: The server offers tools for interactions (e.g., clicking, typing), navigation (e.g., going back, navigating URLs), resource handling (e.g., taking screenshots, saving PDFs), utilities (e.g., closing the browser, resizing the window), and tab management (e.g., opening new tabs, selecting tabs).

Q: Can I run Playwright MCP Server in headless mode?

A: Yes, you can run the server in headless mode for automated tasks that don’t require a visual interface, or in headed mode for debugging and development.

Q: How does Playwright MCP Server handle user profiles?

A: It can run with a persistent profile, storing login information, or in isolated contexts for testing sessions. In isolated mode, each session starts in an isolated profile, and all storage state is lost when the session closes.

Q: What is UBOS and how does it relate to Playwright MCP Server?

A: UBOS is a full-stack AI Agent Development Platform. It simplifies the orchestration of AI agents, connects them with enterprise data, and allows for building custom AI agents. Integrating Playwright MCP Server with UBOS enables powerful AI-driven automation.

Q: Can I configure allowed and blocked origins for network requests?

A: Yes, you can use the --allowed-origins and --blocked-origins arguments to control which origins the browser can request. Blocklist is evaluated before allowlist.

Q: How can I use a configuration file with Playwright MCP Server?

A: You can configure the server using a JSON configuration file and specify its path with the --config command line option. The configuration file can include settings for the browser, server, capabilities, network, and more.

Q: What browsers are supported by Playwright MCP Server?

A: Playwright supports major browsers including Chrome, Firefox, and WebKit. You can specify the browser to use with the --browser argument.