/**
 * @fileoverview ourairports_list_countries — the lookup table for valid
 * country/region filter values used by both search tools. Lists the
 * countries present in the bundled dataset with ISO codes and airport counts,
 * optionally filtered by country and continent with regions nested.
 * @module src/mcp-server/tools/definitions/list-countries.tool
 */
import { z } from '@cyanheads/mcp-ts-core';
import { JsonRpcErrorCode } from '@cyanheads/mcp-ts-core/errors';
export declare const listCountriesTool: import("@cyanheads/mcp-ts-core").ToolDefinition<z.ZodObject<{
    country: z.ZodOptional<z.ZodUnion<readonly [z.ZodLiteral<"">, z.ZodString]>>;
    continent: z.ZodOptional<z.ZodEnum<{
        AF: "AF";
        AN: "AN";
        AS: "AS";
        EU: "EU";
        NA: "NA";
        OC: "OC";
        SA: "SA";
    }>>;
    include_regions: z.ZodDefault<z.ZodBoolean>;
}, z.core.$strip>, z.ZodObject<{
    countries: z.ZodArray<z.ZodObject<{
        code: z.ZodString;
        name: z.ZodString;
        continent: z.ZodNullable<z.ZodString>;
        airportCount: z.ZodNumber;
        regions: z.ZodOptional<z.ZodArray<z.ZodObject<{
            code: z.ZodString;
            name: z.ZodString;
            airportCount: z.ZodNumber;
        }, z.core.$strip>>>;
    }, z.core.$strip>>;
}, z.core.$strip>, readonly [{
    readonly reason: "unknown_country";
    readonly code: JsonRpcErrorCode.NotFound;
    readonly when: "The country code is absent from the bundled country table.";
    readonly recovery: "Call ourairports_list_countries without country to discover valid country codes, then retry.";
}], {
    readonly totalCount: z.ZodNumber;
    readonly notice: z.ZodOptional<z.ZodString>;
}>;
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