Agent Browser Skill

Fast browser automation using accessibility tree snapshots with refs for deterministic element selection.

Why Use This Over Built-in Browser Tool

Use agent-browser when:

Automating multi-step workflows

Need deterministic element selection

Performance is critical

Working with complex SPAs

Need session isolation

Use built-in browser tool when:

Need screenshots/PDFs for analysis

Visual inspection required

Browser extension integration needed

Core Workflow

```bash

1. Navigate and snapshot

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

2. Parse refs from JSON, then interact

agent-browser click @e2 agent-browser fill @e3 "text"

3. Re-snapshot after page changes

agent-browser snapshot -i --json ```

Key Commands

Navigation

```bash agent-browser open agent-browser back | forward | reload | close ```

Snapshot (Always use -i --json)

```bash agent-browser snapshot -i --json # Interactive elements, JSON output agent-browser snapshot -i -c -d 5 --json # + compact, depth limit agent-browser snapshot -s "#main" -i # Scope to selector ```

Interactions (Ref-based)

```bash agent-browser click @e2 agent-browser fill @e3 "text" agent-browser type @e3 "text" agent-browser hover @e4 agent-browser check @e5 | uncheck @e5 agent-browser select @e6 "value" agent-browser press "Enter" agent-browser scroll down 500 agent-browser drag @e7 @e8 ```

Get Information

```bash agent-browser get text @e1 --json agent-browser get html @e2 --json agent-browser get value @e3 --json agent-browser get attr @e4 "href" --json agent-browser get title --json agent-browser get url --json agent-browser get count ".item" --json ```

Check State

```bash agent-browser is visible @e2 --json agent-browser is enabled @e3 --json agent-browser is checked @e4 --json ```

Wait

```bash agent-browser wait @e2 # Wait for element agent-browser wait 1000 # Wait ms agent-browser wait --text "Welcome" # Wait for text agent-browser wait --url "**/dashboard" # Wait for URL agent-browser wait --load networkidle # Wait for network agent-browser wait --fn "window.ready === true" ```

Sessions (Isolated Browsers)

```bash agent-browser --session admin open site.com agent-browser --session user open site.com agent-browser session list

Or via env: AGENT_BROWSER_SESSION=admin agent-browser ...

```

State Persistence

```bash agent-browser state save auth.json # Save cookies/storage agent-browser state load auth.json # Load (skip login) ```

Screenshots & PDFs

```bash agent-browser screenshot page.png agent-browser screenshot --full page.png agent-browser pdf page.pdf ```

Network Control

```bash agent-browser network route "**/ads/*" --abort # Block agent-browser network route "**/api/*" --body '{"x":1}' # Mock agent-browser network requests --filter api # View ```

Cookies & Storage

```bash agent-browser cookies # Get all agent-browser cookies set name value agent-browser storage local key # Get localStorage agent-browser storage local set key val ```

Tabs & Frames

```bash agent-browser tab new https://example.com agent-browser tab 2 # Switch to tab agent-browser frame @e5 # Switch to iframe agent-browser frame main # Back to main ```

Snapshot Output Format

```json { "success": true, "data": { "snapshot": "...", "refs": { "e1": {"role": "heading", "name": "Example Domain"}, "e2": {"role": "button", "name": "Submit"}, "e3": {"role": "textbox", "name": "Email"} } } } ```

Best Practices

1. Always use `-i` flag - Focus on interactive elements 2. Always use `--json` - Easier to parse 3. Wait for stability - `agent-browser wait --load networkidle` 4. Save auth state - Skip login flows with `state save/load` 5. Use sessions - Isolate different browser contexts 6. Use `--headed` for debugging - See what's happening

Example: Search and Extract

```bash agent-browser open https://www.google.com agent-browser snapshot -i --json

AI identifies search box @e1

agent-browser fill @e1 "AI agents" agent-browser press Enter agent-browser wait --load networkidle agent-browser snapshot -i --json

AI identifies result refs

agent-browser get text @e3 --json agent-browser get attr @e4 "href" --json ```

Example: Multi-Session Testing

```bash

Admin session

agent-browser --session admin open app.com agent-browser --session admin state load admin-auth.json agent-browser --session admin snapshot -i --json

User session (simultaneous)

agent-browser --session user open app.com agent-browser --session user state load user-auth.json agent-browser --session user snapshot -i --json ```

Installation

```bash npm install -g agent-browser agent-browser install # Download Chromium agent-browser install --with-deps # Linux: + system deps ```

Credits

Skill created by Yossi Elkrief ([@MaTriXy](https://github.com/MaTriXy))

agent-browser CLI by [Vercel Labs](https://github.com/vercel-labs/agent-browser)