/**
 * Pre-constructed tools for ISO datetime arithmetic, differences, and timezone-aware formatting.
 *
 * @module @nhtio/adk/batteries/tools/datetime_math
 *
 * @remarks
 * Pre-constructed bundled tools for the `datetime_math` category. Import individually, the whole
 * category, or import every tool via `@nhtio/adk/batteries`.
 */
import { Tool } from "../../../common";
/**
 * Add or subtract a duration from a date/time.
 *
 * @remarks
 * All duration components (years/months/weeks/days/hours/minutes/seconds) are optional and
 * combined into a single Duration. Output formatting includes a time component when the input
 * itself has one or when any sub-day component is non-zero.
 */
export declare const dateAddTool: Tool<import("../../../common").SpooledArtifact>;
/**
 * Calculate the difference between two dates/times in a chosen unit.
 *
 * @remarks
 * Result is signed — positive when `to` is after `from`, negative otherwise — but rendered as
 * `|value| <unit> after/before` for readability. Uses luxon's `diff().as(unit)` which respects
 * calendar arithmetic for months/years.
 */
export declare const dateDiffTool: Tool<import("../../../common").SpooledArtifact>;
/**
 * Convert total seconds into a human-readable duration string.
 *
 * @remarks
 * Examples: `3725` → `1 hour, 2 minutes and 5 seconds`. Negative inputs are prefixed with `-`.
 * Zero seconds returns the literal `0 seconds`.
 */
export declare const durationFormatTool: Tool<import("../../../common").SpooledArtifact>;