Browsermcp Skill

BrowserMCP Skill

This skill enables MCP Clients to automate browser interactions through the BrowserMCP protocol. It leverages a local MCP server and a Chrome extension to control the user's actual browser session, allowing for authenticated actions and bypassing common bot detection.

Key Features

• ⚡ Fast: Automation happens locally without network latency
• 🔒 Private: Browser activity stays on the device
• 👤 Logged In: Uses existing browser profile with active sessions
• 🥷 Stealth: Avoids basic bot detection and CAPTCHAs via real browser fingerprint

Prerequisites

Before using BrowserMCP automation:

1. MCP Server: BrowserMCP server must be running (via npx)
2. Chrome Extension: Browser MCP Chrome extension must be installed and connected
3. Active Tab: The target browser tab must be connected via the extension

[!IMPORTANT] The AI can only control tabs that are actively "Connected" via the Browser MCP extension. If you switch tabs, you must reconnect the new tab.

Core Workflow

The standard browser automation process follows an iterative approach:

flowchart TD
    A[Navigate to URL] --> B[Take Snapshot]
    B --> C[Identify Elements]
    C --> D[Interact: Click/Type/etc]
    D --> E[Wait for Changes]
    E --> B
    E --> F[Verify: Screenshot/Logs]

Standard Pattern

Quick Reference

Essential Tools

Common Key Values

Navigation:    Enter, Escape, Tab
Editing:       Backspace, Delete
Arrows:        ArrowUp, ArrowDown, ArrowLeft, ArrowRight
Modifiers:     Control, Alt, Shift, Meta (combine via modifiers array)
Function:      F1-F12
Other:         Home, End, PageUp, PageDown, Space

Usage Examples

Example 1: Search on Google

// Step 1: Navigate to search engine
navigate(url="https://google.com")

// Step 2: Type search query (use snapshot to find the ref)
type(element="Google search box", ref="e12", text="BrowserMCP automation", submit=true)

// Alternative: Type then press Enter separately
type(element="Search box", ref="e12", text="BrowserMCP automation")
press_key(key="Enter")

Example 2: Fill and Submit a Login Form

// Step 1: Navigate to login page
navigate(url="https://example.com/login")

// Step 2: Get snapshot to identify form fields
snapshot()

// Step 3: Fill username field
type(element="Username or email field", ref="e5", text="user@example.com")

// Step 4: Fill password field
type(element="Password field", ref="e7", text="password123")

// Step 5: Click login button
click(element="Sign in button", ref="e9")

// Step 6: Wait for redirect
wait(time=2)

// Step 7: Verify successful login with screenshot
screenshot()

Example 3: Navigate and Extract Information

// Navigate to documentation
navigate(url="https://docs.browsermcp.io")

// Wait for page load
wait(time=1)

// Capture accessibility tree to understand structure
snapshot()

// Click on a documentation link
click(element="API Reference link", ref="e15")

// Wait for content to load
wait(time=1)

// Take screenshot for verification
screenshot()

// Check for any JavaScript errors
get_console_logs()

Example 4: Handle Dynamic Content

// Navigate to page with dynamic content
navigate(url="https://example.com/dashboard")

// Wait for initial load
wait(time=2)

// Take snapshot to see available elements
snapshot()

// Click element that triggers dynamic content
click(element="Load more button", ref="e22")

// Wait for new content to appear
wait(time=2)

// Refresh snapshot to see new elements
snapshot()

// Interact with newly loaded element
click(element="New item", ref="e45")

Best Practices

1. Always Use Snapshots for Element Identification

Good:

// Take snapshot first, then use exact refs
snapshot()
click(element="Submit button", ref="e12")

Bad:

// Guessing selectors without snapshot
click(element="button.submit")  // May not work with dynamic DOM

2. Wait After Navigation and Major Actions

Dynamic web applications often load content asynchronously. Always wait after:

• Navigation to a new page
• Clicking buttons that trigger requests
• Submitting forms

click(element="Load data button", ref="e8")
wait(time=2)  // Wait for data to load
snapshot()    // Then get fresh page structure

3. Handle Connection Requirements

Before any automation:

1. Verify the Browser MCP extension is installed
2. Ensure the target tab is connected (user must click "Connect")
3. If connection errors occur, remind the user to reconnect

4. Use Screenshots for Debugging

When interactions fail:

// Take screenshot to see current page state
screenshot()

// Check console for JavaScript errors
get_console_logs()

// Re-snapshot to see updated element refs
snapshot()

5. Respect Privacy and Security

• BrowserMCP uses the user's actual browser profile
• Be cautious with sensitive data
• User remains logged into their services
• All actions happen locally on the device

Reference Navigation

Troubleshooting

Connection Errors

Error: "No connection to browser extension"

Solution:

1. User must click the Browser MCP extension icon in Chrome toolbar
2. Click "Connect" button on the target tab
3. Only connected tabs can be automated

Element Not Found

Error: Element reference invalid or element not found

Solution:

1. Take a fresh snapshot() - the DOM may have changed
2. Use the new ref values from the updated snapshot
3. Dynamic content may require wait() before snapshot

Action Blocked or Failed

Error: Click/type action didn't work as expected

Solution:

1. Take a screenshot() to see current page state
2. Check get_console_logs() for JavaScript errors
3. Verify element is visible and enabled in snapshot
4. Check for browser-level popups or security prompts
5. Ensure the page has finished loading

CAPTCHA or Bot Detection

Note: BrowserMCP helps avoid basic bot detection by using the real browser profile. However:

• Some sites may still present challenges
• Rate limiting may apply to rapid interactions
• User may need to manually solve some CAPTCHAs

Comparison: BrowserMCP vs Playwright MCP

Tips for Effective Automation

1. Start with navigate + wait + snapshot - Establish baseline page state
2. Use descriptive element names - Helps with debugging and clarity
3. Take screenshots at checkpoints - Visual verification catches issues early
4. Check console logs after errors - JavaScript errors explain many failures
5. Wait strategically - Too short = flakiness, too long = slowness
6. Refresh snapshots after interactions - DOM changes invalidate old refs
7. Use submit=true for forms - Cleaner than separate press_key("Enter")
8. Combine actions efficiently - Group related operations to minimize round-trips

Resources

• BrowserMCP Website: https://browsermcp.io
• Documentation: https://docs.browsermcp.io
• Chrome Extension: Search "Browser MCP" in Chrome Web Store
• GitHub: https://github.com/browsermcp/mcp
• Based on: Playwright MCP