> ## Documentation Index
> Fetch the complete documentation index at: https://browseruse-0aece648-codex-docs-supported-exports.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Use https://docs.browser-use.com/llms.txt and its linked .md pages for current documentation. The managed full bundle is https://docs.browser-use.com/.well-known/llms-full.txt and can be cached for up to 24 hours. Do not use the obsolete /cloud/llms*.txt or /open-source/llms*.txt static exports.
> Choose Cloud API V4 for new agent integrations; V2 is the lower-cost option for simple tasks. Keep V3 examples explicitly versioned. The open-source browser-use library and hosted browser-use-sdk have different APIs.
> Cloud authentication uses X-Browser-Use-API-Key, without a Bearer prefix. Install or upgrade browser-use-sdk and use its explicit v4 import for V4. Check the published OpenAPI reference for request fields; do not invent SDK support for new fields.
> Cloud concurrency and HTTP request rate are separate. Read GET /api/v2/billing/account for the key’s projectId, concurrentSessionLimit, activeSessionCount, and credit balance, including when using V4. Keys in one project share capacity and credits; rateLimit is a legacy concurrency alias, not requests per second.
> Keep the highest applicable existing, legacy-plan, and spend-tier concurrency grant. Current spend tiers are 10 / 50 / 250 / 500 / 1000 at $0 / $200 / $1000 / $5000 / $25000 in qualifying project payments. Legacy or externally billed projects can follow different billing paths; trust the account limit. See https://docs.browser-use.com/cloud/guides/concurrency.md.
> Budget polling across the project: the standard general bucket is 25 requests/second, including V4 event reads and full run reads. Selected status reads have a separate higher bucket. Use bounded workers, stagger polls, respect Retry-After, and drain hasMore event pages after terminal status. A busy V4 session returns 409; its queue holds 10 pending messages and is not a project-wide batch queue.
> A completed run or closed CDP connection does not immediately stop its cloud browser. Stop unneeded owned browsers with PATCH /api/v4/browsers/{id} and {"action":"stop"}. A client wait timeout does not cancel the server-side run.
> Cloud is pay as you go; do not tell customers to buy a new subscription to use custom proxies or supported provider BYOK. Usage funding and model eligibility still apply. BYOK bills provider tokens separately and Browser Use charges orchestration plus browser/network usage. See https://docs.browser-use.com/cloud/guides/billing.md.
> Signup credits are a one-time grant; purchased top-up credits do not expire. Check the API key’s project before diagnosing missing credits. API-key monthly spending caps are soft limits, not a strict prepaid wallet; concurrent or already-running work can exceed them. Auto recharge has separate trigger and purchase amounts and can charge immediately when enabled below the threshold. Use https://browser-use.com/pricing for current rates.

# All Parameters

> Complete API reference for Browser Actor classes, methods, and parameters including BrowserSession, Page, Element, and Mouse

## Browser (BrowserSession)

Main browser session manager.

### Key Methods

```python theme={null}
from browser_use import Browser

browser = Browser()
await browser.start()

# Page management
page = await browser.new_page("https://example.com")
pages = await browser.get_pages()
current = await browser.get_current_page()
await browser.close_page(page)

# To stop the browser session
await browser.stop()
```

### Constructor Parameters

See [Browser Parameters](/open-source/customize/browser/all-parameters) for complete configuration options.

## Page

Browser tab/iframe for page-level operations.

### Navigation

* `goto(url: str)` - Navigate to URL
* `go_back()`, `go_forward()`, `reload()` - History navigation

### Element Finding

* `get_elements_by_css_selector(selector: str) -> list[Element]` - CSS selector
* `get_element(backend_node_id: int) -> Element` - By CDP node ID
* `get_element_by_prompt(prompt: str, llm) -> Element | None` - AI-powered
* `must_get_element_by_prompt(prompt: str, llm) -> Element` - AI (raises if not found)

### JavaScript & Controls

* `evaluate(page_function: str, *args) -> str` - Execute JS (arrow function format)
* `press(key: str)` - Send keyboard input ("Enter", "Control+A")
* `set_viewport_size(width: int, height: int)` - Set viewport
* `screenshot(format='jpeg', quality=None) -> str` - Take screenshot

### Information

* `get_url() -> str`, `get_title() -> str` - Page info
* `mouse -> Mouse` - Get mouse interface

### AI Features

* `extract_content(prompt: str, structured_output: type[T], llm) -> T` - Extract data

## Element

Individual DOM element interactions.

### Interactions

* `click(button='left', click_count=1, modifiers=None)` - Click element
* `fill(text: str, clear=True)` - Fill input
* `hover()`, `focus()` - Mouse/focus actions
* `check()` - Toggle checkbox/radio
* `select_option(values: str | list[str])` - Select dropdown options
* `drag_to(target: Element | Position)` - Drag and drop

### Properties

* `get_attribute(name: str) -> str | None` - Get attribute
* `get_bounding_box() -> BoundingBox | None` - Position/size
* `get_basic_info() -> ElementInfo` - Complete element info
* `screenshot(format='jpeg') -> str` - Element screenshot

## Mouse

Coordinate-based mouse operations.

### Operations

* `click(x: int, y: int, button='left', click_count=1)` - Click at coordinates
* `move(x: int, y: int, steps=1)` - Move mouse
* `down(button='left')`, `up(button='left')` - Press/release buttons
* `scroll(x=0, y=0, delta_x=None, delta_y=None)` - Scroll at coordinates