MCP.Market

Zen MCP server

by sh6drack·io.github.sh6drack/zen-mcp·v1.2.1·20 stars
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MCP server for Zen Browser automation via WebDriver BiDi

B82/100grade B
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Safety scan
B82/100

full report

Adoption
Growing

20 stars75 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Zen tools (20, 2 write)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • zen_check

    Check/uncheck a checkbox or select a radio button

  • zen_click

    Click an element by CSS selector

  • zen_close_tab

    Close a tab by index. Cannot close the last remaining tab.

  • zen_evaluatewrite action

    Execute JavaScript in the page and return the result

  • zen_fill

    Fill a text input or textarea with a value. Clears existing content first. Dispatches input/change events for framework compatibility.

  • zen_fill_form

    Fill multiple form fields at once. Each field specifies selector, value, and action (fill/select/check/uncheck/click).

  • zen_get_form_fields

    List all form fields on the page with names, types, labels, current values, and CSS selectors

  • zen_get_page_text

    Get the page title, URL, and visible text content. Useful for quickly understanding what is on the page.

  • zen_list_pages

    List all open pages/tabs in Zen browser with URLs and titles

  • zen_navigate

    Navigate the active page to a URL

  • zen_new_tab

    Open a new tab, optionally navigating to a URL

  • zen_press_keywrite action

    Send keyboard input to the active page using BiDi input.performActions. Supports special keys like Enter, Tab, Escape, Backspace, and key combinations with modifiers.

  • zen_reconnect

    Force disconnect and reconnect to Zen Browser. Use when the connection is in a bad state or after restarting Zen.

  • zen_screenshot

    Take a screenshot of the current page

  • zen_scroll

    Scroll the page or scroll an element into view

  • zen_select_option

    Select an option in a <select> dropdown by value or text

  • zen_select_page

    Select a page/tab by index (from zen_list_pages) as the active target

  • zen_snapshot

    Get a structured snapshot of visible page elements with CSS selectors. Filter: "all", "interactive", or "form".

  • zen_wait

    Wait for a specified number of milliseconds

  • zen_wait_for

    Wait for text to appear on the page, or for a CSS selector to match an element. Returns when found or after timeout.

Public scan report

scanner v0.1.10 · 2026-09-28 · same rubric, same numbers if you re-run it

no findings
  • Code scan3 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 135 days ago8/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 82/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Zen compares

Against every graded Scraping and browsing MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
82/100
higher than 58% of 866 Scraping and browsing servers
Tools
20
the typical Scraping and browsing server has 6
Tools that change things
10%
typical: 0%. Fewer write tools means less an agent can break
GitHub stars
20
more than 85% of 583 Scraping and browsing servers
Downloads a week
75
more than 49% of 309 Scraping and browsing servers with a package

What its tools let an agent do: 18 read · 2 change

Install Zen in Claude Code, Cursor or VS Code

Runs npx -y zen-mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add zen-mcp -- npx -y zen-mcp
Add to Cursor

What the publisher says

From the Zen repository's README, as published. We do not edit it. Read it on GitHub

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": ["mcp__zen-browser__*"]
  }
}

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

20 Tools

Browse

See

Interact

Utility

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

Config

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Zen: common questions

Is Zen MCP server safe?
Mostly: it is graded B (82/100). Read the Zen safety report
How do I install Zen?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Zen need an API key?
No secret keys are declared. It reads 1 setting from the environment.
Is Zen maintained?
The last commit was 172 days ago (2026-05-16). The latest release is v1.2.1.
What can I use instead of Zen?
Servers from other publishers that do the same job: GrowBlocks Dev Kit MCP server, SeleniumBase MCP server and Next AI Draw.io MCP server.
How does Zen compare with other Scraping and browsing MCP servers?
safety score 82/100 (higher than 58% of 866 Scraping and browsing servers); tools 20 (the typical Scraping and browsing server has 6); tools that change things 10% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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