/**
 * Build the stamper of per-message idempotency tokens for scheduled (clock)
 * deliveries, so a re-run of the same tick cannot post the same message twice.
 * Token format: `tick:<deliveryId>:<ordinal>`.
 */
export declare function createWritebackIdempotency(getDeliveryId?: () => string | undefined): () => string | undefined;
/** Attach the per-message idempotency token to a writeback body when one applies. */
export declare function withWritebackIdempotency(body: Record<string, unknown>, nextIdempotencyKey: () => string | undefined): Record<string, unknown>;
/**
 * Process-wide stamper shared by all ergonomic helper clients in this run.
 * Keeping one ordinal sequence avoids duplicate keys when a scheduled handler
 * writes to multiple providers during the same delivery.
 */
export declare function withProcessWritebackIdempotency(body: Record<string, unknown>): Record<string, unknown>;
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