import type { AcpTrace } from "./trace.js";
export interface BraintrustSpanLike {
    startSpan(args: {
        name: string;
        type: "task" | "tool";
    }): BraintrustSpanLike;
    log(event: {
        input?: unknown;
        output?: unknown;
        metadata?: Record<string, unknown>;
        metrics?: Record<string, number>;
    }): void;
    end(): void;
}
export declare function emitToBraintrust(trace: AcpTrace, parent: BraintrustSpanLike): void;