import type { PipelineExecutionInput } from '../../../handlers/types.js';
export declare function writeInboundClientSnapshot(options: {
    input: PipelineExecutionInput;
    initialMetadata: Record<string, unknown>;
    clientRequestId: string;
}): Promise<void>;
export declare function isPoolExhaustedPipelineError(pipelineError: unknown): boolean;
export declare function resolvePoolCooldownWaitMs(pipelineError: unknown): number | undefined;
export declare function mergeMetadataPreservingDefined(base: Record<string, unknown>, overlay?: Record<string, unknown> | null): Record<string, unknown>;