@agent360/browser-mcp

Browser MCP by Agent360

Control your real Chrome from Claude Code — with your logins, cookies, and 2FA.

The only browser MCP with multi-session support (10 concurrent AI sessions), human-in-the-loop (2FA, CAPTCHA, credentials), and built-in provider integrations (Stripe, HubSpot, Slack, and 6 more). 25 tools total.

Install

npx @agent360/browser-mcp install

This copies the Chrome extension to ~/.browser-mcp/extension/ and configures Claude Code automatically.

Then load the extension in Chrome:

• Open chrome://extensions
• Enable Developer mode (top right)
• Click Load unpacked → select ~/.browser-mcp/extension/
• Restart Claude Code

That's it. 25 browser tools are now available in Claude Code.

Why This Over Playwright MCP / BrowserMCP?

	Browser MCP	Playwright MCP	BrowserMCP.io
Browser	Your real Chrome	Headless (new session)	Your real Chrome
Logins/cookies	Already authenticated	Must log in every time	Already authenticated
Multi-session	10 concurrent sessions with color-coded tab groups	Single session	Single session
Human-in-the-loop	browser_ask_user — 2FA, CAPTCHA, credential input	None	None
Provider integrations	9 built-in (Stripe, HubSpot, Slack...)	None	None
CORS bypass	browser_fetch from extension background	N/A	Limited
Network monitoring	browser_wait_for_network via CDP	Built-in	None
CSP-strict sites	Chrome Debugger API throughout	Works (headless)	Limited
Custom dropdowns	Angular Material, React Select support	Works (headless)	Limited
Install	npx @agent360/browser-mcp install	npx @anthropic-ai/mcp-playwright	Manual clone

25 Tools

Navigation & Content

Tool	Description
browser_navigate	Navigate to URL (reuses tab, or new_tab=true)
browser_get_page_content	Get page text or HTML
browser_screenshot	Screenshot via Chrome Debugger (works even when tab isn't focused)
browser_execute_script	Run JavaScript in page context

Interaction

Tool	Description
browser_click	Click via CSS or text selector (text=Submit, button:text(Next))
browser_fill	Fill input fields (works on CSP-strict sites)
browser_press_key	Keyboard events (Enter, Tab, Escape, modifiers)
browser_scroll	Scroll to element or by pixels
browser_wait	Wait for element to appear
browser_hover	Hover for tooltips/dropdowns
browser_select_option	Native <select> + custom dropdowns (Angular Material, React Select)
browser_handle_dialog	Accept/dismiss alert/confirm/prompt dialogs

Tabs & Frames

Tool	Description
browser_list_tabs	List session's tabs only
browser_switch_tab	Switch to tab by ID
browser_close_tab	Close tab (session-owned only)
browser_get_new_tab	Get most recently opened tab (OAuth popups)
browser_list_frames	List iframes on page
browser_select_frame	Execute JS in specific iframe

Data & Network

Tool	Description
browser_get_cookies	Get cookies for domain
browser_get_local_storage	Read localStorage
browser_fetch	HTTP request from extension (bypasses CORS)
browser_wait_for_network	Wait for specific API call to complete
browser_extract_token	Navigate to provider dashboard + extract API token

CAPTCHA Solving

Tool	Description
browser_solve_captcha	Detect and solve CAPTCHAs. Auto-detects reCAPTCHA v2/v3, hCaptcha, Turnstile, FunCaptcha. Actions: detect, click_checkbox (auto-click, ~80% pass with Google login), click_grid (AI vision guided), ask_human (fallback)

Human-in-the-Loop

Tool	Description
browser_ask_user	Show overlay dialog for 2FA, CAPTCHA, credentials, or any user input

Multi-Session Support

Each Claude Code conversation gets its own MCP server on a unique port (9876-9885). The Chrome extension connects to all active servers simultaneously.

Claude Session 1 ←(stdio)→ MCP :9876 ←(WS)→
Claude Session 2 ←(stdio)→ MCP :9877 ←(WS)→  Chrome Extension → Browser
Claude Session 3 ←(stdio)→ MCP :9878 ←(WS)→

• Session isolation — each session gets a color-coded Chrome Tab Group
• Tab ownership — sessions can only see and control their own tabs
• Auto-cleanup — processes exit when Claude Code closes the conversation

Built-in Provider Integrations

browser_extract_token navigates to the provider's API settings page and guides token extraction:

Provider	Token Format	Dashboard
Stripe	sk_test_... / sk_live_...	stripe.com/apikeys
HubSpot	pat-...	app.hubspot.com
Slack	xoxb-...	api.slack.com/apps
Shopify	Admin API token	admin.shopify.com
Pipedrive	UUID	app.pipedrive.com
Calendly	JWT	calendly.com
Mailchimp	...-us1	admin.mailchimp.com
Google	OAuth Client	console.cloud.google.com
LinkedIn	Client ID/Secret	linkedin.com/developers

Architecture

extension/
  manifest.json       # Manifest V3
  background.js       # Service worker — Chrome API dispatcher, session tab groups
  offscreen.js        # Persistent WebSocket bridge (multi-port scanning)
  popup.html/js       # Status UI — sessions, tabs, action log

mcp-server/
  index.js            # MCP server (stdio) + WebSocket client
  tools.js            # 21 tool definitions
  bin/cli.js          # Install CLI

How It Works

• Claude Code starts → spawns MCP server via stdio
• MCP server binds to first available port (9876-9885)
• Extension's offscreen document scans ports every 2s
• WebSocket connection established
• Commands flow: Claude Code → MCP → Extension → Chrome APIs
• Process auto-exits when Claude Code closes (stdin detection)

Auto-Updates

The MCP server runs via npx @agent360/browser-mcp@latest — always the latest version from npm. No manual git pulls needed.

To update the extension: npx @agent360/browser-mcp install (re-copies files), then reload in chrome://extensions.

Troubleshooting

"Chrome extension not connected"

• Check extension is loaded in chrome://extensions
• Click the extension popup → "Reconnect"
• Wait 2-3 seconds for port scan

Screenshot fails

• Uses Chrome Debugger API (works even when tab isn't focused)
• Falls back to captureVisibleTab if debugger unavailable

Click doesn't work on SPA

• Try text selector: browser_click("text=Submit")
• Uses real mouse events via Chrome Debugger API automatically

Stale processes

• Processes auto-exit when Claude Code closes (stdin detection)
• Idle timeout: 4 hours without commands → auto-exit
• Manual cleanup: lsof -i :9876-9885 | grep LISTEN

License

MIT — Agent360