import type { Tier } from "./types.js";
/**
 * Determine the access tier from an API key.
 * No key or invalid key = free tier.
 */
export declare function resolveTier(apiKey?: string): Tier;
/**
 * Redact sensitive pricing fields for free-tier users.
 * Shows structure but hides vendor, model, and price.
 */
export declare function redactForFreeTier(rows: Record<string, unknown>[], fieldsToRedact?: string[]): Record<string, unknown>[];
/**
 * Build a free-tier summary: count + price range (no individual records).
 */
export declare function buildFreeTierSummary(rows: Record<string, unknown>[]): {
    total_results: number;
    price_range: {
        min: number | null;
        max: number | null;
    };
    modalities: string[];
    directions: string[];
    upgrade_message: string;
};
/**
 * Returns an additional content block for free-tier responses.
 * This plain-text note ensures the AI assistant surfaces the upgrade path.
 */
export declare function freeTierNote(toolContext: string): {
    type: "text";
    text: string;
};
/**
 * Gate a full result set based on tier.
 * Paid tier gets everything. Free tier gets redacted + summary.
 */
export declare function gateResults(rows: Record<string, unknown>[], tier: Tier): unknown;
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