/**
 * Provenance and AI-generated marker helpers (issue #42).
 *
 * NotebookLM answers are LLM-generated synthesis grounded on user-supplied
 * documents — which may include attacker-influenceable content (poisoned PDFs
 * etc.). The host agent must be able to distinguish this from deterministic
 * retrieval. We attach a structured `_provenance` envelope and, by default,
 * prefix the answer text with an AI-generated marker.
 *
 * Both behaviours can be tuned via env vars without breaking the response
 * shape:
 *   NOTEBOOKLM_AI_MARKER=false           — drop the inline prefix
 *   NOTEBOOKLM_AI_MARKER_PREFIX="..."    — override the prefix string
 */
export interface Provenance {
    provider: "google-notebooklm";
    model: "gemini-2.5";
    via: "chrome-automation";
    grounding: "user-uploaded-documents";
    ai_generated: true;
}
export declare const PROVENANCE: Provenance;
export declare function aiMarkerEnabled(): boolean;
export declare function aiMarkerPrefix(): string;
/**
 * Prefix the raw answer with the AI-generated marker when enabled.
 * The marker is placed on its own line so it remains visible even when the
 * client renders the answer as Markdown.
 */
export declare function applyAiMarker(answer: string): string;
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