/**
 * Resolve per-request unit preferences from tool arguments.
 *
 * Precedence (highest first):
 *   1. per-call individual overrides (temperature_unit, wind_speed_unit, ...)
 *   2. per-call system preset (units: "imperial" | "metric")
 *   3. the server-wide default (from the environment)
 */
import { UnitPreferences } from '../config/units.js';
/**
 * Unit-related arguments accepted by weather tools. All optional; when a tool
 * omits a given knob from its schema, callers simply never set it.
 */
export interface UnitArgs {
    units?: string;
    temperature_unit?: string;
    wind_speed_unit?: string;
    precipitation_unit?: string;
    pressure_unit?: string;
    distance_unit?: string;
    time_format?: string;
}
/**
 * Resolve the effective unit preferences for a single tool invocation.
 *
 * @param args - The tool arguments (may contain units/*_unit/time_format)
 * @param base - Base preferences to build on (defaults to the env-configured default)
 * @returns Fully-resolved preferences
 * @throws Error if any provided unit value is unrecognized
 */
export declare function resolveUnitPreferences(args: UnitArgs | undefined | null, base?: UnitPreferences): UnitPreferences;
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