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MCP server for Zen Browser automation via WebDriver BiDi
MCP server for Zen Browser automation via WebDriver BiDi
This is a well-structured MCP server for Zen Browser automation with appropriate security practices. The code uses environment variables for configuration, implements proper error handling, and graceful shutdown procedures. No significant security concerns were found. Supply chain analysis found 3 known vulnerabilities in dependencies (0 critical, 3 high severity). Package verification found 1 issue.
3 files analyzed · 6 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
This plugin requests these system permissions. Most are normal for its category.
Set these up before or after installing:
Environment variable: ZEN_DEBUG_PORT
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-sh6drack-zen-mcp": {
"env": {
"ZEN_DEBUG_PORT": "your-zen-debug-port-here"
},
"args": [
"-y",
"zen-mcp"
],
"command": "npx"
}
}
}From the project's GitHub README.
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.
/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 runzen.
# 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.
| 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 |
| 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 |
| 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 |
| 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 |
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.
| 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 |
| Env Variable | Default | Description |
|---|---|---|
ZEN_DEBUG_PORT | 9222 | Zen's remote debugging port |
node test-e2e.mjs # 21 tests, needs Zen running
MIT
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