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chrome-use/skills/agent-browser/references/commands.md
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Chris Tateandctate 6dd53449e8 Add auto-dismissal for alert and beforeunload dialogs (#1075)
* Add auto-dismissal for alert and beforeunload dialogs

This PR adds automatic handling of JavaScript dialogs to prevent the agent from blocking indefinitely when `alert()` or `beforeunload` dialogs appear on web pages.

## Summary

Previously, when a website displayed native browser confirmation dialogs (like alerts or "Are you sure you want to leave?" prompts), agent-browser would hang waiting for manual intervention. This is a common issue since many websites use these dialogs for notifications or navigation warnings.

## Changes Made

- **Auto-dismiss functionality**: Added a background task that automatically accepts `alert` and `beforeunload` dialogs while leaving `confirm` and `prompt` dialogs for explicit handling
- **New flag**: Added `--no-auto-dialog` flag to disable automatic handling when needed
- **Environment variable**: Added `AGENT_BROWSER_NO_AUTO_DIALOG` for configuration
- **Documentation**: Updated README and docs with usage examples and configuration details
- **Tests**: Added comprehensive test coverage for flag parsing and dialog handling logic

## Implementation Details

- Only `alert` (notification-only) and `beforeunload` (navigation warning) dialogs are auto-handled for safety
- `confirm` and `prompt` dialogs still require explicit `dialog accept/dismiss` commands to ensure agents make deliberate choices for destructive actions
- The feature is enabled by default since these dialog types rarely require user decision-making
- Uses Chrome DevTools Protocol's `Page.handleJavaScriptDialog` for reliable dialog dismissal

Fixes #1070

* Log dialog type and message before auto-dismissal

Without this, auto-dismissed alert/beforeunload dialogs are silently
swallowed and the agent has no way to see what the dialog said. Adding
an eprintln before the CDP call makes the dismissal visible in stderr
for debugging.

* Log dialog dismissal errors instead of silently discarding them

- Remove premature "accepted" from log message since it fires before
  the CDP command executes
- Replace `let _ =` with `if let Err(e)` to log failures when
  Page.handleJavaScriptDialog fails
- Apply rustfmt to auto-dialog tests

---------

Co-authored-by: ctate <366502+ctate@users.noreply.github.com>
2026-03-29 12:00:27 -06:00

11 KiB

Command Reference

Complete reference for all agent-browser commands. For quick start and common patterns, see SKILL.md.

Navigation

agent-browser open <url>      # Navigate to URL (aliases: goto, navigate)
                              # Supports: https://, http://, file://, about:, data://
                              # Auto-prepends https:// if no protocol given
agent-browser back            # Go back
agent-browser forward         # Go forward
agent-browser reload          # Reload page
agent-browser close           # Close browser (aliases: quit, exit)
agent-browser connect 9222    # Connect to browser via CDP port

Snapshot (page analysis)

agent-browser snapshot            # Full accessibility tree
agent-browser snapshot -i         # Interactive elements only (recommended)
agent-browser snapshot -c         # Compact output
agent-browser snapshot -d 3       # Limit depth to 3
agent-browser snapshot -s "#main" # Scope to CSS selector

Interactions (use @refs from snapshot)

agent-browser click @e1           # Click
agent-browser click @e1 --new-tab # Click and open in new tab
agent-browser dblclick @e1        # Double-click
agent-browser focus @e1           # Focus element
agent-browser fill @e2 "text"     # Clear and type
agent-browser type @e2 "text"     # Type without clearing
agent-browser press Enter         # Press key (alias: key)
agent-browser press Control+a     # Key combination
agent-browser keydown Shift       # Hold key down
agent-browser keyup Shift         # Release key
agent-browser hover @e1           # Hover
agent-browser check @e1           # Check checkbox
agent-browser uncheck @e1         # Uncheck checkbox
agent-browser select @e1 "value"  # Select dropdown option
agent-browser select @e1 "a" "b"  # Select multiple options
agent-browser scroll down 500     # Scroll page (default: down 300px)
agent-browser scrollintoview @e1  # Scroll element into view (alias: scrollinto)
agent-browser drag @e1 @e2        # Drag and drop
agent-browser upload @e1 file.pdf # Upload files

Get Information

agent-browser get text @e1        # Get element text
agent-browser get html @e1        # Get innerHTML
agent-browser get value @e1       # Get input value
agent-browser get attr @e1 href   # Get attribute
agent-browser get title           # Get page title
agent-browser get url             # Get current URL
agent-browser get cdp-url         # Get CDP WebSocket URL
agent-browser get count ".item"   # Count matching elements
agent-browser get box @e1         # Get bounding box
agent-browser get styles @e1      # Get computed styles (font, color, bg, etc.)

Check State

agent-browser is visible @e1      # Check if visible
agent-browser is enabled @e1      # Check if enabled
agent-browser is checked @e1      # Check if checked

Screenshots and PDF

agent-browser screenshot          # Save to temporary directory
agent-browser screenshot path.png # Save to specific path
agent-browser screenshot --full   # Full page
agent-browser pdf output.pdf      # Save as PDF

Video Recording

agent-browser record start ./demo.webm    # Start recording
agent-browser click @e1                   # Perform actions
agent-browser record stop                 # Stop and save video
agent-browser record restart ./take2.webm # Stop current + start new

Wait

agent-browser wait @e1                     # Wait for element
agent-browser wait 2000                    # Wait milliseconds
agent-browser wait --text "Success"        # Wait for text (or -t)
agent-browser wait --url "**/dashboard"    # Wait for URL pattern (or -u)
agent-browser wait --load networkidle      # Wait for network idle (or -l)
agent-browser wait --fn "window.ready"     # Wait for JS condition (or -f)

Mouse Control

agent-browser mouse move 100 200      # Move mouse
agent-browser mouse down left         # Press button
agent-browser mouse up left           # Release button
agent-browser mouse wheel 100         # Scroll wheel

Semantic Locators (alternative to refs)

agent-browser find role button click --name "Submit"
agent-browser find text "Sign In" click
agent-browser find text "Sign In" click --exact      # Exact match only
agent-browser find label "Email" fill "user@test.com"
agent-browser find placeholder "Search" type "query"
agent-browser find alt "Logo" click
agent-browser find title "Close" click
agent-browser find testid "submit-btn" click
agent-browser find first ".item" click
agent-browser find last ".item" click
agent-browser find nth 2 "a" hover

Browser Settings

agent-browser set viewport 1920 1080          # Set viewport size
agent-browser set viewport 1920 1080 2        # 2x retina (same CSS size, higher res screenshots)
agent-browser set device "iPhone 14"          # Emulate device
agent-browser set geo 37.7749 -122.4194       # Set geolocation (alias: geolocation)
agent-browser set offline on                  # Toggle offline mode
agent-browser set headers '{"X-Key":"v"}'     # Extra HTTP headers
agent-browser set credentials user pass       # HTTP basic auth (alias: auth)
agent-browser set media dark                  # Emulate color scheme
agent-browser set media light reduced-motion  # Light mode + reduced motion

Cookies and Storage

agent-browser cookies                     # Get all cookies
agent-browser cookies set name value      # Set cookie
agent-browser cookies clear               # Clear cookies
agent-browser storage local               # Get all localStorage
agent-browser storage local key           # Get specific key
agent-browser storage local set k v       # Set value
agent-browser storage local clear         # Clear all

Network

agent-browser network route <url>              # Intercept requests
agent-browser network route <url> --abort      # Block requests
agent-browser network route <url> --body '{}'  # Mock response
agent-browser network unroute [url]            # Remove routes
agent-browser network requests                 # View tracked requests
agent-browser network requests --filter api    # Filter requests

Tabs and Windows

agent-browser tab                 # List tabs
agent-browser tab new [url]       # New tab
agent-browser tab 2               # Switch to tab by index
agent-browser tab close           # Close current tab
agent-browser tab close 2         # Close tab by index
agent-browser window new          # New window

Frames

agent-browser frame "#iframe"     # Switch to iframe by CSS selector
agent-browser frame @e3           # Switch to iframe by element ref
agent-browser frame main          # Back to main frame

Iframe support

Iframes are detected automatically during snapshots. When the main-frame snapshot runs, Iframe nodes are resolved and their content is inlined beneath the iframe element in the output (one level of nesting; iframes within iframes are not expanded).

agent-browser snapshot -i
# @e3 [Iframe] "payment-frame"
#   @e4 [input] "Card number"
#   @e5 [button] "Pay"

# Interact directly — refs inside iframes already work
agent-browser fill @e4 "4111111111111111"
agent-browser click @e5

# Or switch frame context for scoped snapshots
agent-browser frame @e3               # Switch using element ref
agent-browser snapshot -i             # Snapshot scoped to that iframe
agent-browser frame main              # Return to main frame

The frame command accepts:

  • Element refsframe @e3 resolves the ref to an iframe element
  • CSS selectorsframe "#payment-iframe" finds the iframe by selector
  • Frame name/URL — matches against the browser's frame tree

Dialogs

By default, alert and beforeunload dialogs are automatically accepted so they never block the agent. confirm and prompt dialogs still require explicit handling. Use --no-auto-dialog to disable this behavior.

agent-browser dialog accept [text]  # Accept dialog
agent-browser dialog dismiss        # Dismiss dialog
agent-browser dialog status         # Check if a dialog is currently open

JavaScript

agent-browser eval "document.title"          # Simple expressions only
agent-browser eval -b "<base64>"             # Any JavaScript (base64 encoded)
agent-browser eval --stdin                   # Read script from stdin

Use -b/--base64 or --stdin for reliable execution. Shell escaping with nested quotes and special characters is error-prone.

# Base64 encode your script, then:
agent-browser eval -b "ZG9jdW1lbnQucXVlcnlTZWxlY3RvcignW3NyYyo9Il9uZXh0Il0nKQ=="

# Or use stdin with heredoc for multiline scripts:
cat <<'EOF' | agent-browser eval --stdin
const links = document.querySelectorAll('a');
Array.from(links).map(a => a.href);
EOF

State Management

agent-browser state save auth.json    # Save cookies, storage, auth state
agent-browser state load auth.json    # Restore saved state

Global Options

agent-browser --session <name> ...    # Isolated browser session
agent-browser --json ...              # JSON output for parsing
agent-browser --headed ...            # Show browser window (not headless)
agent-browser --full ...              # Full page screenshot (-f)
agent-browser --cdp <port> ...        # Connect via Chrome DevTools Protocol
agent-browser -p <provider> ...       # Cloud browser provider (--provider)
agent-browser --proxy <url> ...       # Use proxy server
agent-browser --proxy-bypass <hosts>  # Hosts to bypass proxy
agent-browser --headers <json> ...    # HTTP headers scoped to URL's origin
agent-browser --executable-path <p>   # Custom browser executable
agent-browser --extension <path> ...  # Load browser extension (repeatable)
agent-browser --ignore-https-errors   # Ignore SSL certificate errors
agent-browser --help                  # Show help (-h)
agent-browser --version               # Show version (-V)
agent-browser <command> --help        # Show detailed help for a command

Debugging

agent-browser --headed open example.com   # Show browser window
agent-browser --cdp 9222 snapshot         # Connect via CDP port
agent-browser connect 9222                # Alternative: connect command
agent-browser console                     # View console messages
agent-browser console --clear             # Clear console
agent-browser errors                      # View page errors
agent-browser errors --clear              # Clear errors
agent-browser highlight @e1               # Highlight element
agent-browser inspect                     # Open Chrome DevTools for this session
agent-browser trace start                 # Start recording trace
agent-browser trace stop trace.zip        # Stop and save trace
agent-browser profiler start              # Start Chrome DevTools profiling
agent-browser profiler stop trace.json    # Stop and save profile

Environment Variables

AGENT_BROWSER_SESSION="mysession"            # Default session name
AGENT_BROWSER_EXECUTABLE_PATH="/path/chrome" # Custom browser path
AGENT_BROWSER_EXTENSIONS="/ext1,/ext2"       # Comma-separated extension paths
AGENT_BROWSER_PROVIDER="browserbase"         # Cloud browser provider
AGENT_BROWSER_STREAM_PORT="9223"             # Override WebSocket streaming port (default: OS-assigned)
AGENT_BROWSER_HOME="/path/to/agent-browser"  # Custom install location