export type AiAgentRequestHeaders = {
    accept?: string;
    signatureAgent?: string;
    signature?: string;
    signatureInput?: string;
    userAgent?: string;
};
/**
 * Returns true if the request appears to be from an AI agent or a client that
 * should receive the markdown representation when llms.txt is enabled.
 * Uses Accept header, HTTP Message Signatures (Signature-Agent), and a
 * known list of AI agent User-Agent substrings defined in code.
 * Agents may send both User-Agent and Signature-Agent; any matching signal is enough.
 */
export declare function isAiAgentRequest(headers: AiAgentRequestHeaders): boolean;
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