Zen MCP

Name: Zen MCP
Author: sh6drack

by sh6drackversion 1.2.1i★ –iRuns on your computer

Registry nameio.github.sh6drack/zen-mcp

Install

Overview

Description from the maker (original English)

MCP server for Zen Browser automation via WebDriver BiDi

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Web & browsers

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
You fill in yourself: ZEN_DEBUG_PORT

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "zen": {
      "command": "npx",
      "args": [
        "-y",
        "zen-mcp"
      ],
      "env": {
        "ZEN_DEBUG_PORT": "your-value"
      }
    }
  }
}

Run this in your terminal

claude mcp add zen --env ZEN_DEBUG_PORT=your-value -- npx -y zen-mcp

Fill in the empty values before running it.

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "zen": {
      "command": "npx",
      "args": [
        "-y",
        "zen-mcp"
      ],
      "env": {
        "ZEN_DEBUG_PORT": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "zen": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "zen-mcp"
      ],
      "env": {
        "ZEN_DEBUG_PORT": "your-value"
      }
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

Values you fill in

ZEN_DEBUG_PORT env
Zen Browser remote debugging port

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 7, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account sh6drack, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Web & browsersi

More stars than 0% of the other 1378 servers in this category
Published to the registry more recently than 3% of the other 1378 servers in this category
Basic checks equal to or better than 100% of the other 1378 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Zen MCP safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.2.1) reached the registry 8 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Browser Use, Chrome DevTools MCP, MCP Server Browser

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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Lets AI do web tasks for you, such as filling forms, searching and extracting data, in the maker’s cloud browsers or on your computer.

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by ChromeDevTools

Lets AI use Chrome’s developer tools to inspect pages, find what makes them slow and spot errors. Made by the Chrome DevTools team.

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Install

MCP Server Browser

by bytedance

MCP server for browser use access

Runs on your computer★ 39,550Apache-2.0Updated 14 months ago

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

zen-mcp

The first MCP server for Zen Browser. Automate Zen from Claude Code, Cursor, or any MCP client.

No Selenium. No Playwright. No browser drivers. Just WebSocket.

Setup (2 minutes)

1. Start Zen with remote debugging

/Applications/Zen.app/Contents/MacOS/zen --remote-debugging-port 9222

Pro tip: Add alias zen='open /Applications/Zen.app --args --remote-debugging-port 9222' to your shell config. Then just run zen.

2. Add to Claude Code

# Option A: npm (recommended)

npm install -g zen-mcp

Option B: Clone

git clone https://github.com/sh6drack/zen-mcp.git && cd zen-mcp && npm install

Add to ~/.claude/mcp_servers.json:

"mcpServers": { "zen-browser": { "command": "zen-mcp" } } }

If you cloned instead of npm install, use "command": "node", "args": ["/absolute/path/to/zen-mcp/server.mjs"]

Add to ~/.claude/settings.json:

"permissions": { "allow": ["mcpzen-browser*"] } }

That's it. Start a new Claude Code session and the zen_* tools are available.

20 Tools

Browse

Tool	What it does
`zen_navigate`	Go to a URL
`zen_list_pages`	List all open tabs
`zen_select_page`	Switch to a tab
`zen_new_tab`	Open a new tab
`zen_close_tab`	Close a tab

See

Tool	What it does
`zen_snapshot`	Page structure with selectors (filter: all/interactive/form)
`zen_screenshot`	Capture a screenshot
`zen_get_page_text`	Get page title, URL, and text
`zen_get_form_fields`	List all form fields with labels and values

Interact

Tool	What it does
`zen_click`	Click an element
`zen_fill`	Type into an input or textarea
`zen_select_option`	Pick a dropdown option
`zen_check`	Toggle a checkbox or radio
`zen_press_key`	Keyboard input (Enter, Tab, Ctrl+A, etc.)
`zen_fill_form`	Fill multiple fields at once
`zen_scroll`	Scroll the page or to an element

Utility

Tool	What it does
`zen_evaluate`	Run JavaScript in the page
`zen_wait`	Wait N milliseconds
`zen_wait_for`	Wait for text or element to appear
`zen_reconnect`	Force reconnect to Zen

How It Works

Claude Code  ──stdio/MCP──>  zen-mcp  ──WebSocket/BiDi──>  Zen Browser

zen-mcp speaks WebDriver BiDi (W3C standard) directly over WebSocket. Form filling uses native value setters with input/change event dispatch so React, Vue, and Angular apps work correctly.

What Works Well

Navigation, clicking, form filling — rock solid, handles React/Vue/Angular
Screenshots and page reads — reliable content extraction
Tab management — open, close, switch between tabs
JavaScript evaluation — run any code in the page context
Keyboard input — shortcuts, Enter, Tab, modifier combos

Known Limitations

Zen inherits Firefox's WebDriver BiDi implementation, which is still maturing. Some advanced BiDi commands that work in Chrome may not be available yet.
Zombie sessions can only be cleared by restarting Zen (BiDi session.end is connection-scoped). zen-mcp detects this and tells you what to do.
No file upload or drag-and-drop support (BiDi spec limitation).

Built-in Reliability

Auto-reconnect with exponential backoff if WebSocket drops
Zombie session recovery when a previous client crashed
Connection retry (3 attempts with backoff)
Clean shutdown on SIGINT/SIGTERM to prevent orphaned sessions

Troubleshooting

Problem	Fix
"Cannot connect to Zen Browser"	Start Zen with `--remote-debugging-port 9222`
"Maximum number of active sessions"	Restart Zen: `killall zen && zen`
Connection keeps dropping	Use `zen_reconnect` to force a fresh connection

Config

Env Variable	Default	Description
`ZEN_DEBUG_PORT`	`9222`	Zen's remote debugging port

Requirements

Zen Browser
Node.js 20+

Test

node test-e2e.mjs   # 21 tests, needs Zen running

License

MIT

Zen MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

Values you fill in

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Web & browsersi

Common questions

Alternatives

Browser Use

Chrome DevTools MCP

MCP Server Browser

README from the maker

zen-mcp

Setup (2 minutes)

1. Start Zen with remote debugging

2. Add to Claude Code

Option B: Clone

20 Tools

Browse

See

Interact

Utility

How It Works

What Works Well

Known Limitations

Built-in Reliability

Troubleshooting

Config

Requirements

Test

License