Browser Automation Skill

Use agent-browser for headless Chromium browser automation when you need to:

• Navigate web pages and extract content
• Fill forms and click buttons
• Take screenshots for visual verification
• Execute JavaScript in page context

When to Use Browser vs Other Tools

• WebFetch: Simple GET requests, reading page text. Preferred when sufficient.
• Browser: JavaScript-heavy SPAs, form interactions, screenshots, multi-step flows.

CLI Reference

# Navigate to a URL
agent-browser navigate --url "https://example.com"

# Take a snapshot (accessibility tree — lightweight alternative to screenshot)
agent-browser snapshot

# Take a screenshot (saves PNG — use cwd or /tmp)
agent-browser screenshot --path ./screenshot.png

# Click an element (by CSS selector or text)
agent-browser click --selector "button.submit"
agent-browser click --text "Sign In"

# Fill a form field
agent-browser fill --selector "input[name=email]" --value "user@example.com"

# Execute JavaScript in page context
agent-browser execute --script "document.title"

# Wait for an element to appear
agent-browser wait --selector ".results" --timeout 5000

Headless Mode

All commands run in headless Chromium by default. No display server required. Set PLAYWRIGHT_BROWSERS_PATH=/ms-playwright if browsers are installed there (Docker default).

Error Handling

• If agent-browser is not installed, fall back to WebFetch for simple page reads.
• Timeouts default to 30 seconds. Use --timeout to override.
• Navigation errors (DNS, SSL) are reported as exit code 1 with stderr details.

Security

• Browser runs inside the sandboxed agent container.
• No credentials are available — use the relay proxy for authenticated requests.
• Screenshots are written to the sandbox working directory.