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Playwright MCP is an MCP server that lets an AI assistant control real browsers through Playwright. Instead of asking a vision model to interpret pixels, it returns structured accessibility snapshots containing roles, labels, text, and element references. The model can then navigate, click, type, submit forms, switch tabs, and perform other Playwright actions against those references.
To run it, install Node.js 20 or newer, use a compatible MCP client such as VS Code, Cursor, Windsurf, Claude Code, or Claude Desktop, and configure the client to launch @playwright/mcp@latest. The browser downloads on first use. Persistent sessions preserve cookies and logins by default; isolated mode starts clean. Treat arbitrary-code execution as a serious security boundary.
What Playwright MCP does
Playwright MCP is a Model Context Protocol server built on Playwright. Its key design choice is representing a page as an accessibility tree rather than as a screenshot or raw stream of DOM nodes. A snapshot can expose a heading, textbox, checkbox, list item, and their readable names, each with a reference such as e5 or e10.
An AI client reads that snapshot, chooses an element, and sends the reference as the target of the next tool call. This makes ordinary browser work possible without a vision model:
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- Navigate to a URL and inspect the resulting page.
- Click links, buttons, checkboxes, tabs, and menu items.
- Type into textboxes and fill forms.
- Hover, drag and drop, press keys, and handle dialogs.
- Open, close, and switch browser tabs.
- Take screenshots when a visual artifact is useful.
The model is still operating a real browser. JavaScript, redirects, authentication, popups, timing, and site-specific failures remain possible; an accessibility snapshot is a control surface, not a guarantee that every page is automatable.
Prerequisites and installation
Install the required runtime
The documented prerequisite is Node.js 20 or newer. You also need an MCP client that can launch a local server, such as VS Code, Cursor, Windsurf, Claude Code, Claude Desktop, or another compatible client.
Verify Node before configuring the client:
node --versionIf the output is below 20, install a current Node.js release before continuing. The Playwright browser binary downloads automatically the first time the MCP server starts.
Add the MCP server to your client
Add a server entry using the client’s MCP configuration screen or configuration file. The standard configuration is:
{
"mcpServers": {
"playwright": {
"command": "npx",
"args": ["@playwright/mcp@latest"]
}
}
}Restart or reload the MCP client after saving the entry. On the first connection, npx resolves the package and Playwright obtains the browser it needs. A slow first start is normal while those packages are downloaded.
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Select a different browser engine
Playwright MCP documents Chrome/Chromium, Firefox, WebKit, and Microsoft Edge. Pass a browser flag when starting the server; for example:
npx @playwright/mcp@latest --browser=firefoxThe supported values listed in the guide include chrome, firefox, webkit, and msedge. Keep the default configuration when you want the standard Chromium-based launch, and select another engine when cross-browser behavior is the thing you are testing.
Your first browser task
The official getting-started flow uses TodoMVC because it exposes a simple, accessible form. Give the connected assistant a task such as “open the TodoMVC page, inspect the accessibility snapshot, and add a todo.” A typical interaction is:
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- The server returns a snapshot containing the page heading and a textbox reference.
- The assistant targets that textbox reference and types the todo text.
- The assistant presses Enter or invokes the appropriate keyboard action.
- A new list item appears; the assistant can request another snapshot to verify it.
References belong to the current page state. After navigation, a major dynamic update, or a tab switch, request a fresh snapshot rather than assuming an old reference is still valid.
How interaction differs from pixel-based browser agents
| Aspect | Playwright MCP approach | Practical consequence |
|---|---|---|
| Representation | Structured accessibility snapshots and element references | Actions target readable roles, labels, and text instead of screen coordinates. |
| Visual understanding | No vision model is required for ordinary interactions | Screenshot interpretation is not the primary control loop. |
| Actions | Playwright-backed navigation, clicks, typing, forms, keyboard input, hover, drag and drop, dialogs, tabs, and screenshots | The assistant can cover normal web workflows and still capture visual evidence when needed. |
| Complex scripting | Optional direct Playwright code through browser_run_code_unsafe |
Custom scripts can handle flows that are awkward to express as individual tool calls, but they carry a much higher trust requirement. |
Browser choices and connection modes
You can launch a fresh browser or attach to one that already exists. Choose the mode according to where the session and its credentials live.
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| Mode | Use it when | Important detail |
|---|---|---|
| Fresh local browser | You want a straightforward headed or headless automation session | The MCP server starts and controls its own Playwright browser. |
| Chrome or Edge channel | You need a locally installed browser channel rather than the downloaded browser | Useful when reproducing behavior in a specific desktop browser. |
| CDP endpoint | A Chromium-based browser is already running, locally or remotely | Connections can target Chrome/Chromium, Edge, Electron apps, and cloud browser services through a CDP endpoint such as http://localhost:9222. |
| Remote Playwright endpoint | A browser is hosted behind a Playwright server | The MCP server attaches to that remote browser instead of launching its own. |
| Extension mode | You need existing Chrome or Edge tabs, logins, cookies, SSO, 2FA, or installed extensions | The extension connects to tabs already open in the user’s browser and reuses that session state. |
Attachment modes change the trust boundary. A local profile may contain personal accounts; a CDP or remote endpoint may expose an entire shared browser. Restrict network access to those endpoints and do not give an untrusted client control of an authenticated session.
Profiles, cookies, and authentication state
Persistent mode is the default. Playwright MCP stores a profile so cookies and login state survive between sessions. That is convenient for workflows that repeatedly access the same account, but it also means a later task may inherit permissions from an earlier one.
Use isolated mode when every run should start fresh. For a controlled persistent location, provide a custom --user-data-dir. A useful policy is:
- Use an isolated profile for public-site testing, demos, and untrusted prompts.
- Use a dedicated persistent profile for a specific test account.
- Use extension mode only when reusing an existing desktop session is intentional.
- Never place production credentials in a profile shared by multiple agents or operators.
Security: treat arbitrary browser code as privileged
The browser_run_code_unsafe tool allows direct Playwright JavaScript. The getting-started documentation explicitly warns that this executes arbitrary JavaScript in the Playwright server process and is RCE-equivalent. Enable it only for trusted MCP clients.
For safer deployments:
- Do not enable the unsafe tool for clients that accept untrusted prompts or extensions.
- Run the MCP server under a dedicated operating-system account with minimal filesystem and network permissions.
- Use isolated browser profiles for untrusted tasks.
- Keep CDP and remote Playwright endpoints private and authenticated where supported.
- Review which client, user, and agent can invoke the server before connecting an account with sensitive data.
Normal snapshot-driven actions still deserve review: a click can submit a purchase, delete data, or approve an account change even when no arbitrary JavaScript is involved.
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Designing reliable automations
Prefer accessible targets
Ask the agent to use the element’s role, accessible name, or visible label. Accessibility references are more robust than coordinates and usually survive responsive layout changes. When a page changes substantially, obtain a new snapshot and reacquire references.
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Dynamic pages may render controls after an API response, animation, or navigation. Let the assistant wait for the expected element or page state before clicking. A fixed delay can be too short on a slow run and wasteful on a fast one.
Separate navigation from verification
After submitting a form or following a link, verify the resulting heading, status text, list item, or URL. Verification catches redirects, validation errors, and sessions that have silently expired.
Use direct Playwright code selectively
Snapshot actions are preferable for ordinary tasks because each operation is visible to the MCP client. Reserve browser_run_code_unsafe for workflows that genuinely need custom loops, network-aware logic, or Playwright APIs unavailable through the standard tools, and keep those scripts short and reviewed.
Or skip the browser setup
If your goal is a clean static image or PDF rather than an AI-driven interactive session, ScreenshotNeo provides a website screenshot API and MCP server. It accepts a URL in one GET request and returns PNG, JPEG, WebP, or PDF. Before capture it accepts the cookie or consent banner like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each cleanup step can be turned off.
Only clean shots are billed. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, and the response identifies the result with X-Page-Verdict and X-Billed headers. Its MCP server exposes take_screenshot, get_page_info, and capture_pdf for Claude, Cursor, and other MCP clients.
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One-call cURL example
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the complete parameter reference in the ScreenshotNeo documentation. The same request from Python is:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)And in Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);ScreenshotNeo includes full-page capture with lazy images loaded, CSS-selector element capture, dark mode, 12 device presets plus custom viewports, retina scale, PDF paper and page options, custom CSS and JavaScript, click-before-capture, hidden selectors, waits for selectors, delays or network idle, request and resource blocking, custom headers, cookies, user agents, Authorization, timezone and geolocation, transparent backgrounds, resizing, selectable cache TTLs, signed image links, asynchronous jobs with signed webhooks, bulk capture of up to 100 URLs per call, a usage API, an OpenAPI specification, and compatibility with parameter names used by other screenshot APIs.
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Troubleshooting common failures
| Symptom | Likely cause | Fix |
|---|---|---|
| The client cannot start the server | Node is missing or older than version 20, or the MCP entry is malformed | Run node --version, upgrade Node, confirm the JSON entry, and restart the client. |
| First launch appears stuck | npx is downloading the package and browser |
Allow the initial download to finish; check the client’s server log for a network or permission error. |
| An element reference no longer works | The page navigated or re-rendered after the snapshot | Request a fresh accessibility snapshot and use the new reference. |
| The expected logged-in page is anonymous | The run is using an isolated or different profile | Switch to the intended persistent profile, set the correct --user-data-dir, or use extension mode with the already authenticated tab. |
| CDP connection fails | The endpoint is unavailable, points to a non-Chromium browser, or is blocked by network policy | Confirm the browser is Chrome/Chromium-based, verify the endpoint and port, and ensure the MCP process can reach it. |
| A workflow cannot complete a complex branch | Individual snapshot actions are insufficient for the custom logic | Use a reviewed direct Playwright script only with a trusted MCP client; remember that the unsafe tool is RCE-equivalent. |
| Actions affect the wrong tab | An existing browser has multiple tabs or the agent switched context | List or inspect tabs, select the intended one, then obtain a new snapshot before acting. |
Performance, reliability, and cost considerations
Playwright MCP has no stable performance or reliability figure published in the documented material. Real run time depends on the selected engine, page weight, network, browser startup, authentication, and the waits your workflow requires. Reusing a persistent browser or attaching to an already running browser can avoid startup work, while isolated sessions provide cleaner repeatability.
The MCP package itself does not define a hosted-browser price in this setup. You operate the local or remote browser process, so infrastructure, CI minutes, cloud-browser usage, and bandwidth are separate costs determined by your deployment. If you need only rendered images or PDFs, an API such as ScreenshotNeo uses a per-shot plan instead of requiring you to maintain browser orchestration.
Choosing the right deployment
- Local interactive assistant: start the standard server and use a persistent profile when you intentionally want saved logins.
- Clean test runs: use isolated mode and a selected engine such as Firefox or WebKit to check cross-browser behavior.
- Existing desktop workflow: use extension mode when the required SSO, 2FA, cookies, or extensions are already open.
- CI or remote infrastructure: connect through a controlled Playwright or CDP endpoint and limit access to trusted clients.
- Static capture pipeline: use ScreenshotNeo when the output is a cleaned screenshot or PDF rather than an interactive agent session.
Frequently Asked Questions
Can Playwright MCP automate an Electron application?
Yes, when the Electron application exposes a reachable Chromium DevTools Protocol endpoint; the documented CDP connection mode includes Electron apps.
Which browser value should I use for Microsoft Edge?
Use the documented msedge browser value when selecting the Edge channel.
Does extension mode copy my cookies into a new profile?
No. Extension mode connects to existing Chrome or Edge tabs so the current session, cookies, logins, and installed extensions remain in that browser.
Quick Recap
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