/** Metrics recorded for a single conversation turn. */
export type MetricsTurn = Record<string, any>;
/** Collects per-turn metrics; any undefined method resolves to a no-op, so instrumentation calls are always safe. */
export type MetricsCollector = {
    /** Recorded turns. */
    turns: MetricsTurn[];
    [key: string]: any;
};
/** Shared {@link MetricsCollector}; undefined methods read as no-ops, so any metrics call is safe. */
export declare const metricsCollector: MetricsCollector;