import type { NativeGenerateGuardConfig } from "../types/index.js";
/** V3-shape adapter for the reclaim policy shared with streaming guards. */
export declare function createNativeGenerateGuard(config: NativeGenerateGuardConfig): {
    /**
     * Record the prompt-token count the vendor reported for the step just
     * sent.
     *
     * Paired with the estimate this guard made for that same step it yields a
     * calibration ratio — how far the local estimator undercounts what the
     * vendor actually charges — and that ratio scales the reclaim threshold,
     * so the guard fires against real token accounting rather than its own.
     * A non-finite or non-positive figure is ignored, leaving calibration at
     * 1 rather than skewing it toward a number the vendor never reported.
     */
    observeUsage(usage: unknown): void;
    /**
     * Reclaim context from `conversation` when it has crossed the guard's
     * threshold, or return `undefined` to send it unchanged.
     *
     * The initial task prefix — every message up to and including the first
     * user turn — is protected as a unit, so leading system messages cannot
     * displace the task itself from entry zero. Only the entries strictly
     * between that prefix and the newest `DEFAULT_LOOP_GUARD_PROTECTED_TAIL`
     * are eligible for truncation or dropping under the shared reclaim
     * policy; that protected tail — the live working set — is left intact.
     */
    guardConversation(conversation: Array<Record<string, unknown>>): Array<Record<string, unknown>> | undefined;
};