/**
 * Configuration for USPTO API keys.
 *
 * All ODP (Open Data Portal) tools require a free API key from
 * https://data.uspto.gov/apis/getting-started — set USPTO_API_KEY.
 *
 * PatentsView and TSDR have their own keys.
 */
export interface UsptoConfig {
    odpApiKey: string | null;
    patentsviewApiKey: string | null;
    tsdrApiKey: string | null;
}
export declare function getConfig(): UsptoConfig;
/**
 * Returns a structured "key missing" response for key-required tools.
 * This is returned as content (not thrown), so the LLM gets helpful guidance.
 */
export declare function keyMissingResponse(envVar: string, registrationUrl: string, toolName: string): {
    content: {
        type: "text";
        text: string;
    }[];
};
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