import type { Tier } from "./types.js";
/** No key or an unknown key means free tier. */
export declare function resolveTier(apiKey?: string): Promise<Tier>;
/** Replace vendor, model and price fields with the upgrade label. */
export declare function redactForFreeTier(rows: Record<string, unknown>[], fieldsToRedact?: string[]): Record<string, unknown>[];
/** Free-tier summary: count and price range, no individual records. */
export declare function buildFreeTierSummary(rows: Record<string, unknown>[]): {
    total_results: number;
    price_range: {
        min: number | null;
        max: number | null;
    };
    units: string[];
    modalities: string[];
    directions: string[];
};
/** Plain-text note so the assistant surfaces the upgrade path. */
export declare function freeTierNote(toolContext: string): {
    type: "text";
    text: string;
};
/** Paid tier gets every row; free tier gets a summary and a redacted sample. */
export declare function gateResults(rows: Record<string, unknown>[], tier: Tier): unknown;
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