/**
 * Playwright browser retrieval adapter.
 *
 * Human-in-the-loop (HITL) browser route for subscription content:
 * 1. Opens a visible browser window navigating to the paper's landing page.
 * 2. Detects if verification is needed (CAPTCHA, login, cookie consent).
 * 3. If verification needed → returns status "needs_human" with the page open
 *    for the user to interact with. The LLM relays this to the user.
 * 4. Once verification is done (or not needed), tries to find a PDF link
 *    or capture HTML full text.
 * 5. Saves browser state (cookies/storage) after success for future sessions.
 *
 * The browser instance is kept alive across MCP calls in the same server process.
 */
export interface BrowserRetrievalResult {
    success: boolean;
    artifact_path: string | null;
    artifact_type: "pdf" | "html" | null;
    needs_human_interaction: boolean;
    human_message: string | null;
    state_saved: boolean;
    page_title: string | null;
    page_url: string | null;
    error: string | null;
}
/**
 * Main browser retrieval function.
 *
 * @param url - URL to navigate to (DOI landing page or publisher URL)
 * @param stateDir - Directory for saving browser state
 * @param cacheDir - Directory where downloaded artifacts are stored
 * @param doi - DOI for organizing cached artifacts
 * @param action - "navigate" (default), "check" (check if verification done), or "close"
 */
export declare function browserRetrieve(url: string, stateDir: string, cacheDir?: string, doi?: string | null, action?: "navigate" | "check" | "close"): Promise<BrowserRetrievalResult>;
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