Launch the browser and navigate to a URL, or navigate the active tab to a new URL.

Observe and extract the structured semantic state of the current active page, filtering out DOM noise. Note: If you see dropdowns/menus with expanded: false, you must hover them to reveal contents, then observe again.

Compute the difference between two semantic states. Optional: pass parameters if querying offline; otherwise defaults to comparing the last two observed page states in memory.

Run safety action verification on a semantic node to confirm if it supports click/fill/hover and is interactable. Optional: pass 'state' if querying offline; otherwise defaults to last observed state.

Execute an action (click, fill, hover) on a node using its ID. Optional: pass 'state' if querying offline; otherwise defaults to last observed state.

Retrieve the pre-computed selector plan (primary + healed fallback locators) for a specific semantic node. Optional: pass 'state' if querying offline; otherwise defaults to last observed state.

Search the last observed page state for nodes matching specific criteria (role, name content, enabled state). Extremely fast and token-efficient.

Take a screenshot of the current page viewport and return it as a base64 encoded PNG string (useful for visual validation).

Execute arbitrary JavaScript code in the page context and return the result. Fast and direct.

List all open tabs/pages in the browser session. Returns index, title, and URL for each.

Switch the active page context to a specific tab by its index (from browser_list_pages).

Save page cookies to a file for session persistence.