/**
 * Forwarding a borrowed request to a lender's proxy.
 *
 * The wire format is unchanged Anthropic Messages in both directions, so this is
 * a passthrough, not a translation: the lender's proxy speaks exactly what the
 * borrower's client already sent. That is what makes peer borrowing cheap
 * compared with the provider fallback chain, which has to reshape the request
 * for a different API.
 *
 * **Reading the refusal, not the status.** A lender's 429 can mean "your grant
 * is spent" or "the upstream throttled me"; those want opposite reactions from
 * the borrower. The distinction is carried in `x-neurolink-grant-reason`, so
 * that header — not the status code — decides how long the peer is parked.
 *
 * @module proxy/peerTransport
 */
import type { ProxyPeer, ProxyPeerAttempt, ProxyPeerCooldownReason } from "../types/index.js";
/**
 * Map a lender's refusal to how long the peer should be left alone.
 *
 * Anything not recognized is treated as an upstream problem rather than a grant
 * problem — the conservative reading, since it recovers soonest.
 */
export declare function peerReasonFromRefusal(grantReason: string | null): ProxyPeerCooldownReason;
/**
 * Send one request to one peer.
 *
 * On success the upstream `Response` is handed back with only an idle deadline
 * wrapped around its body, so a stream keeps streaming — buffering it here
 * would add the whole generation time to time-to-first-token on a path that is
 * already a second hop.
 */
export declare function forwardToPeer(args: {
    peer: ProxyPeer;
    body: string;
    stream: boolean;
    signal?: AbortSignal;
}): Promise<ProxyPeerAttempt>;