import type { SpanProcessor } from "#compiled/@vercel/otel/index.js";
/** Routes spans from agent-owned traces to provider-neutral child processors. */
export declare class AgentTraceSpanProcessor implements SpanProcessor {
    #private;
    constructor(children: readonly SpanProcessor[]);
    forceFlush(): Promise<void>;
    isAttached(): boolean;
    onStart(span: unknown, parentContext: unknown): void;
    onEnd(span: unknown): void;
    /** Trace ids whose session is still open, so retention never evicts them. */
    activeTraceIds(): ReadonlySet<string>;
    /**
     * Forgets every trace one root session owned, reporting whether it owned any.
     * A subagent child owns none, so releasing one reports `false` and leaves the
     * shared trace pinned until its root finishes.
     */
    releaseSession(sessionId: string): boolean;
    shutdown(): Promise<void>;
}