import type { DraftGraphResponse, ErrorResponse, Diagnostics, LimitsResponse, SseEvent } from "./types.js";
/**
 * Type guard: check if a payload is a DraftGraphResponse
 */
export declare function isDraftGraphResponse(payload: unknown): payload is DraftGraphResponse;
/**
 * Type guard: check if a payload is an ErrorResponse
 */
export declare function isErrorResponse(payload: unknown): payload is ErrorResponse;
/**
 * Extract diagnostics from an SSE event if present.
 *
 * Returns null when the event does not contain a DraftGraphResponse payload.
 */
export declare function getDiagnosticsFromEvent(event: SseEvent): Diagnostics | null;
/**
 * Normalized graph caps derived from LimitsResponse.
 */
export interface GraphCaps {
    maxNodes: number;
    maxEdges: number;
}
/**
 * Normalize graph limits from LimitsResponse, preferring graph_max_* fields
 * while falling back to legacy aliases when necessary.
 */
export declare function getGraphCaps(limits: LimitsResponse): GraphCaps;
/**
 * Normalized quota view for convenience when working with LimitsResponse.
 */
export interface NormalizedQuota {
    capacityRpm?: number;
    tokens?: number;
    refillRatePerSec?: number;
    /**
     * Client-friendly retry-after in milliseconds (derived from retry_after_seconds).
     */
    retryAfterMs?: number;
}
/**
 * Normalized view of the standard request quota, or null when not present.
 */
export declare function getStandardQuota(limits: LimitsResponse): NormalizedQuota | null;
/**
 * Normalized view of the SSE request quota, or null when not present.
 */
export declare function getSseQuota(limits: LimitsResponse): NormalizedQuota | null;