/**
 * @fileoverview Field discovery tool for OpenAlex valid filter, group_by, and select fields.
 * @module mcp-server/tools/definitions/describe-fields.tool
 */
import { z } from '@cyanheads/mcp-ts-core';
export declare const describeFieldsTool: import("@cyanheads/mcp-ts-core").ToolDefinition<z.ZodObject<{
    entity_type: z.ZodEnum<{
        authors: "authors";
        funders: "funders";
        institutions: "institutions";
        keywords: "keywords";
        publishers: "publishers";
        sources: "sources";
        topics: "topics";
        works: "works";
    }>;
    context: z.ZodEnum<{
        filter: "filter";
        group_by: "group_by";
        select: "select";
    }>;
    query: z.ZodOptional<z.ZodString>;
}, z.core.$strip>, z.ZodObject<{
    entity_type: z.ZodString;
    context: z.ZodString;
    fields: z.ZodArray<z.ZodString>;
    total: z.ZodNumber;
}, z.core.$strip>, undefined, undefined>;
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