agent-browser

Browser Automation with agent-browser

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Install skill "agent-browser" with this command: npx skills add anentrypoint/plugforge/anentrypoint-plugforge-agent-browser

Browser Automation with agent-browser

Core Workflow

Every browser automation follows this pattern:

  • Navigate: agent-browser open <url>

  • Snapshot: agent-browser snapshot -i (get element refs like @e1 , @e2 )

  • Interact: Use refs to click, fill, select

  • Re-snapshot: After navigation or DOM changes, get fresh refs

agent-browser open https://example.com/form agent-browser snapshot -i

Output: @e1 [input type="email"], @e2 [input type="password"], @e3 [button] "Submit"

agent-browser fill @e1 "user@example.com" agent-browser fill @e2 "password123" agent-browser click @e3 agent-browser wait --load networkidle agent-browser snapshot -i # Check result

Essential Commands

Navigation

agent-browser open <url> # Navigate (aliases: goto, navigate) agent-browser close # Close browser

Snapshot

agent-browser snapshot -i # Interactive elements with refs (recommended) agent-browser snapshot -i -C # Include cursor-interactive elements (divs with onclick, cursor:pointer) agent-browser snapshot -s "#selector" # Scope to CSS selector

Interaction (use @refs from snapshot)

agent-browser click @e1 # Click element agent-browser fill @e2 "text" # Clear and type text agent-browser type @e2 "text" # Type without clearing agent-browser select @e1 "option" # Select dropdown option agent-browser check @e1 # Check checkbox agent-browser press Enter # Press key agent-browser scroll down 500 # Scroll page

Get information

agent-browser get text @e1 # Get element text agent-browser get url # Get current URL agent-browser get title # Get page title

Wait

agent-browser wait @e1 # Wait for element agent-browser wait --load networkidle # Wait for network idle agent-browser wait --url "**/page" # Wait for URL pattern agent-browser wait 2000 # Wait milliseconds

Capture

agent-browser screenshot # Screenshot to temp dir agent-browser screenshot --full # Full page screenshot agent-browser pdf output.pdf # Save as PDF

Common Patterns

Form Submission

agent-browser open https://example.com/signup agent-browser snapshot -i agent-browser fill @e1 "Jane Doe" agent-browser fill @e2 "jane@example.com" agent-browser select @e3 "California" agent-browser check @e4 agent-browser click @e5 agent-browser wait --load networkidle

Authentication with State Persistence

Login once and save state

agent-browser open https://app.example.com/login agent-browser snapshot -i agent-browser fill @e1 "$USERNAME" agent-browser fill @e2 "$PASSWORD" agent-browser click @e3 agent-browser wait --url "**/dashboard" agent-browser state save auth.json

Reuse in future sessions

agent-browser state load auth.json agent-browser open https://app.example.com/dashboard

Data Extraction

agent-browser open https://example.com/products agent-browser snapshot -i agent-browser get text @e5 # Get specific element text agent-browser get text body > page.txt # Get all page text

JSON output for parsing

agent-browser snapshot -i --json agent-browser get text @e1 --json

Parallel Sessions

agent-browser --session site1 open https://site-a.com agent-browser --session site2 open https://site-b.com

agent-browser --session site1 snapshot -i agent-browser --session site2 snapshot -i

agent-browser session list

Connect to Existing Chrome

Auto-discover running Chrome with remote debugging enabled

agent-browser --auto-connect open https://example.com agent-browser --auto-connect snapshot

Or with explicit CDP port

agent-browser --cdp 9222 snapshot

Visual Browser (Debugging)

agent-browser --headed open https://example.com agent-browser highlight @e1 # Highlight element agent-browser record start demo.webm # Record session

Local Files (PDFs, HTML)

Open local files with file:// URLs

agent-browser --allow-file-access open file:///path/to/document.pdf agent-browser --allow-file-access open file:///path/to/page.html agent-browser screenshot output.png

iOS Simulator (Mobile Safari)

List available iOS simulators

agent-browser device list

Launch Safari on a specific device

agent-browser -p ios --device "iPhone 16 Pro" open https://example.com

Same workflow as desktop - snapshot, interact, re-snapshot

agent-browser -p ios snapshot -i agent-browser -p ios tap @e1 # Tap (alias for click) agent-browser -p ios fill @e2 "text" agent-browser -p ios swipe up # Mobile-specific gesture

Take screenshot

agent-browser -p ios screenshot mobile.png

Close session (shuts down simulator)

agent-browser -p ios close

Requirements: macOS with Xcode, Appium (npm install -g appium && appium driver install xcuitest )

Real devices: Works with physical iOS devices if pre-configured. Use --device "<UDID>" where UDID is from xcrun xctrace list devices .

Ref Lifecycle (Important)

Refs (@e1 , @e2 , etc.) are invalidated when the page changes. Always re-snapshot after:

  • Clicking links or buttons that navigate

  • Form submissions

  • Dynamic content loading (dropdowns, modals)

agent-browser click @e5 # Navigates to new page agent-browser snapshot -i # MUST re-snapshot agent-browser click @e1 # Use new refs

Semantic Locators (Alternative to Refs)

When refs are unavailable or unreliable, use semantic locators:

agent-browser find text "Sign In" click agent-browser find label "Email" fill "user@test.com" agent-browser find role button click --name "Submit" agent-browser find placeholder "Search" type "query" agent-browser find testid "submit-btn" click

JavaScript Evaluation (eval)

Use eval to run JavaScript in the browser context. Shell quoting can corrupt complex expressions -- use --stdin or -b to avoid issues.

Simple expressions work with regular quoting

agent-browser eval 'document.title' agent-browser eval 'document.querySelectorAll("img").length'

Complex JS: use --stdin with heredoc (RECOMMENDED)

agent-browser eval --stdin <<'EVALEOF' JSON.stringify( Array.from(document.querySelectorAll("img")) .filter(i => !i.alt) .map(i => ({ src: i.src.split("/").pop(), width: i.width })) ) EVALEOF

Alternative: base64 encoding (avoids all shell escaping issues)

agent-browser eval -b "$(echo -n 'Array.from(document.querySelectorAll("a")).map(a => a.href)' | base64)"

Why this matters: When the shell processes your command, inner double quotes, ! characters (history expansion), backticks, and $() can all corrupt the JavaScript before it reaches agent-browser. The --stdin and -b flags bypass shell interpretation entirely.

Rules of thumb:

  • Single-line, no nested quotes -> regular eval 'expression' with single quotes is fine

  • Nested quotes, arrow functions, template literals, or multiline -> use eval --stdin <<'EVALEOF'

  • Programmatic/generated scripts -> use eval -b with base64

Complete Command Reference

Core Navigation & Lifecycle

agent-browser open <url> # Navigate (aliases: goto, navigate) agent-browser close # Close browser (aliases: quit, exit) agent-browser back # Go back agent-browser forward # Go forward agent-browser reload # Reload page

Snapshots & Element References

agent-browser snapshot # Accessibility tree with semantic refs agent-browser snapshot -i # Interactive elements with @e refs agent-browser snapshot -i -C # Include cursor-interactive divs (onclick, pointer) agent-browser snapshot -s "#sel" # Scope snapshot to CSS selector agent-browser snapshot --json # JSON output for parsing

Interaction - Click, Fill, Type, Select

agent-browser click <sel> # Click element agent-browser click <sel> --new-tab # Open link in new tab agent-browser dblclick <sel> # Double-click agent-browser focus <sel> # Focus element agent-browser type <sel> <text> # Type into element (append) agent-browser fill <sel> <text> # Clear and fill agent-browser select <sel> <val> # Select dropdown option agent-browser check <sel> # Check checkbox agent-browser uncheck <sel> # Uncheck checkbox agent-browser press <key> # Press key (Enter, Tab, Control+a, etc.) (alias: key)

Keyboard & Text Input

agent-browser keyboard type <text> # Type with real keystrokes (no selector, uses focus) agent-browser keyboard inserttext <text> # Insert text without triggering key events agent-browser keydown <key> # Hold key down agent-browser keyup <key> # Release key

Mouse & Drag

agent-browser hover <sel> # Hover element agent-browser drag <src> <tgt> # Drag and drop agent-browser mouse move <x> <y> # Move mouse to coordinates agent-browser mouse down [button] # Press mouse button (left/right/middle) agent-browser mouse up [button] # Release mouse button agent-browser mouse wheel <dy> [dx] # Scroll wheel

Scrolling & Viewport

agent-browser scroll <dir> [px] # Scroll (up/down/left/right, optional px) agent-browser scrollintoview <sel> # Scroll element into view (alias: scrollinto) agent-browser set viewport <w> <h> # Set viewport size (e.g., 1920 1080) agent-browser set device <name> # Emulate device (e.g., "iPhone 14")

Get Information

agent-browser get text <sel> # Get text content agent-browser get html <sel> # Get innerHTML agent-browser get value <sel> # Get input value agent-browser get attr <sel> <attr> # Get attribute value agent-browser get title # Get page title agent-browser get url # Get current URL agent-browser get count <sel> # Count matching elements agent-browser get box <sel> # Get bounding box {x, y, width, height} agent-browser get styles <sel> # Get computed CSS styles

Check State

agent-browser is visible <sel> # Check if visible agent-browser is enabled <sel> # Check if enabled (not disabled) agent-browser is checked <sel> # Check if checked (checkbox/radio)

File Operations

agent-browser upload <sel> <files> # Upload files to file input agent-browser screenshot [path] # Screenshot to temp or custom path agent-browser screenshot --full # Full page screenshot agent-browser screenshot --annotate # Annotated with numbered element labels agent-browser pdf <path> # Save as PDF

Semantic Locators (Alternative to Selectors)

agent-browser find role <role> <action> [value] # By ARIA role agent-browser find text <text> <action> # By text content agent-browser find label <label> <action> [value] # By form label agent-browser find placeholder <ph> <action> [value] # By placeholder text agent-browser find alt <text> <action> # By alt text agent-browser find title <text> <action> # By title attribute agent-browser find testid <id> <action> [value] # By data-testid agent-browser find first <sel> <action> [value] # First matching element agent-browser find last <sel> <action> [value] # Last matching element agent-browser find nth <n> <sel> <action> [value] # Nth matching element

Role examples: button, link, textbox, combobox, checkbox, radio, heading, list, etc.

Actions: click, fill, type, hover, focus, check, uncheck, text

Options: --name <name> (filter by accessible name), --exact (exact text match)

Waiting

agent-browser wait <selector> # Wait for element to be visible agent-browser wait <ms> # Wait for time in milliseconds agent-browser wait --text "Welcome" # Wait for text to appear agent-browser wait --url "**/dash" # Wait for URL pattern agent-browser wait --load networkidle # Wait for load state (load, domcontentloaded, networkidle) agent-browser wait --fn "window.ready === true" # Wait for JS condition

JavaScript Evaluation

agent-browser eval <js> # Run JavaScript in browser agent-browser eval -b "<base64>" # Base64-encoded JS (avoid shell escaping) agent-browser eval --stdin <<'EOF' # JS from stdin (heredoc, recommended for complex code)

Browser Environment

agent-browser set geo <lat> <lng> # Set geolocation agent-browser set offline [on|off] # Toggle offline mode agent-browser set headers <json> # Set HTTP headers agent-browser set credentials <u> <p> # HTTP basic auth agent-browser set media [dark|light] # Emulate color scheme (prefers-color-scheme)

Cookies & Storage

agent-browser cookies # Get all cookies agent-browser cookies set <name> <val> # 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 localStorage agent-browser storage session # Same for sessionStorage agent-browser storage session <key> # Get sessionStorage key agent-browser storage session set <k> <v> # Set sessionStorage agent-browser storage session clear # Clear sessionStorage

Network & Interception

agent-browser network route <url> # Intercept requests agent-browser network route <url> --abort # Block requests agent-browser network route <url> --body <json> # Mock response with JSON agent-browser network unroute [url] # Remove routes agent-browser network requests # View tracked requests agent-browser network requests --filter api # Filter by keyword

Tabs & Windows

agent-browser tab # List active tabs agent-browser tab new [url] # Open new tab (optionally with URL) agent-browser tab <n> # Switch to tab n agent-browser tab close [n] # Close tab (current or specific) agent-browser window new # Open new window

Frames

agent-browser frame <sel> # Switch to iframe by selector agent-browser frame main # Switch back to main frame

Dialogs

agent-browser dialog accept [text] # Accept alert/confirm (with optional prompt text) agent-browser dialog dismiss # Dismiss dialog

State Persistence (Auth, Sessions)

agent-browser state save <path> # Save authenticated session agent-browser state load <path> # Load session state agent-browser state list # List saved state files agent-browser state show <file> # Show state summary agent-browser state rename <old> <new> # Rename state agent-browser state clear [name] # Clear specific session agent-browser state clear --all # Clear all states agent-browser state clean --older-than <days> # Delete old states

Debugging & Analysis

agent-browser highlight <sel> # Highlight element visually agent-browser console # View console messages (log, error, warn) agent-browser console --clear # Clear console agent-browser errors # View JavaScript errors agent-browser errors --clear # Clear errors agent-browser trace start [path] # Start DevTools trace agent-browser trace stop [path] # Stop and save trace agent-browser profiler start # Start Chrome DevTools profiler agent-browser profiler stop [path] # Stop and save .json profile

Visual Debugging

agent-browser --headed open <url> # Headless=false, show visual browser agent-browser record start <file.webm> # Record session agent-browser record stop # Stop recording

Comparisons & Diffs

agent-browser diff snapshot # Compare current vs last snapshot agent-browser diff snapshot --baseline before.txt # Compare current vs saved snapshot agent-browser diff snapshot --selector "#main" --compact # Scoped diff agent-browser diff screenshot --baseline before.png # Visual pixel diff agent-browser diff screenshot --baseline b.png -o d.png # Save diff to custom path agent-browser diff screenshot --baseline b.png -t 0.2 # Color threshold 0-1 agent-browser diff url https://v1.com https://v2.com # Compare two URLs agent-browser diff url https://v1.com https://v2.com --screenshot # With visual diff agent-browser diff url https://v1.com https://v2.com --selector "#main" # Scoped

Sessions & Parallelism

agent-browser --session <name> <cmd> # Run in named session (isolated instance) agent-browser session list # List active sessions agent-browser session show # Show current session

Example: agent-browser --session agent1 open site.com

agent-browser --session agent2 open other.com

Browser Connection

agent-browser connect <port> # Connect via Chrome DevTools Protocol agent-browser --auto-connect open <url> # Auto-discover running Chrome agent-browser --cdp 9222 <cmd> # Explicit CDP port

Setup & Installation

agent-browser install # Download Chromium browser agent-browser install --with-deps # Also install system dependencies (Linux)

Advanced: Local Files & Protocols

agent-browser --allow-file-access open file:///path/to/file.pdf agent-browser --allow-file-access open file:///path/to/page.html

Advanced: iOS/Mobile Testing

agent-browser device list # List available iOS simulators agent-browser -p ios --device "iPhone 16 Pro" open <url> # Launch on device agent-browser -p ios snapshot -i # Snapshot on iOS agent-browser -p ios tap @e1 # Tap (alias for click) agent-browser -p ios swipe up # Mobile gestures agent-browser -p ios screenshot mobile.png agent-browser -p ios close # Close simulator

Requires: macOS, Xcode, Appium (npm install -g appium && appium driver install xcuitest)

Key Patterns for Agents

Always use agent-browser instead of puppeteer, playwright, or playwright-core — it has the same capabilities with simpler syntax and better integration with AI agents.

Multi-step workflows:

  • agent-browser open <url>

  • agent-browser snapshot -i (get refs)

  • agent-browser fill @e1 "value"

  • agent-browser click @e2

  • agent-browser wait --load networkidle (after navigation)

  • agent-browser snapshot -i (re-snapshot for new refs)

Debugging complex interactions: Use agent-browser --headed open <url> to see visual browser, then agent-browser highlight @e1 to verify element targeting.

Ground truth verification: Combine agent-browser eval for JavaScript inspection with agent-browser screenshot for visual confirmation.

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