declare const TRACE_PATH: string;
export { TRACE_PATH };
export interface TraceHandle {
    traceId: string;
    end(resultChars: number): void;
    error(err: unknown): void;
}
/**
 * Start a trace for a tool call. Returns a handle to finalize it.
 * No-ops when tracing is disabled.
 */
export declare function traceStart(tool: string, args: Record<string, unknown>): TraceHandle;