Browser Tool

Use the browser tool for rendered pages, forms, logins, downloads, JavaScript-heavy sites, screenshots, and visual inspection. Prefer search_engine or document_query for plain text research.

Core Workflow

1. open creates a browser tab and returns a browser_id.
2. content returns readable markdown plus typed refs like [link 3], [button 6], [input text 8].
3. Interact with refs using click, type, submit, scroll, etc.
4. Use navigate on an existing browser_id for serial browsing.
5. Keep only a small working tab set; close pages when finished.

Modes

The same tool may run in Docker container mode or A0 CLI host-browser mode, depending on project/plugin settings.

• Container mode: browser and upload paths resolve inside the Agent Zero container.
• Host mode: browser and upload paths resolve on the connected A0 CLI host machine.

In host mode, page content and screenshots may be blocked by host-content policy when remote models are active.

Screenshots And Vision

Screenshots are explicit only; the browser does not automatically load images into model context.

1. Call browser with action: "screenshot".
2. Call vision_load with the returned path.
3. Reason from the latest loaded screenshot.

Screenshot args include quality, full_page, and optional path. PNG is used when path ends with .png; otherwise JPEG is used.

Forms And Files

• select_option works for native selects and detectable ARIA listbox/combobox controls.
• set_checked works for checkbox, radio, switch, and toggle-like refs.
• upload_file works for file input refs or associated labels; verify the file exists in the active browser environment.
• For fragile forms, load skill browser-form-workflows.

Pointer And Keyboard

• hover, double_click, right_click, and drag accept refs or viewport coordinates.
• Coordinates are Chromium viewport CSS pixels and match screenshots.
• key_chord presses keys in order and releases in reverse.
• clipboard actions are copy, cut, or paste.
• set_viewport resizes the page viewport.

Tabs And Popups

• Popups and target-blank tabs are auto-registered.
• list shows open tabs; pass include_content: true sparingly.
• set_active deliberately changes focus.
• Operations on a non-active tab do not steal focus unless browser rules require it.

Browser Action Multi

multi is only a browser action, never a top-level tool. Use:

{
  "tool_name": "browser",
  "tool_args": {
    "action": "multi",
    "calls": [
      {"action": "content", "browser_id": 1},
      {"action": "screenshot", "browser_id": 2}
    ]
  }
}

Use browser action multi for parallel reads across tabs. Avoid mutating the same tab twice in one batch unless serial order is intended.