import { CallToolResult } from '@modelcontextprotocol/sdk/types.js';
/**
 * Whether a thrown error is an HTTP 404 from the Lexware client.
 *
 * `lexwareRequest` wraps AxiosErrors as `new Error(msg, { cause: axiosError })`,
 * so the status is on `err.cause.response.status` — that's the reliable signal.
 *
 * The message fallback exists for errors that lost their cause, and is anchored to
 * the two shapes `formatError` emits. It deliberately does NOT scan for a bare
 * "404" anywhere in the message: that text also appears in error bodies and in
 * voucher/invoice numbers, and a false positive here turns a real failure into a
 * silent retry loop.
 */
export declare function isNotFound(err: unknown): boolean;
/**
 * Retry `fn` while Lexware reports the resource as not-yet-there: a 404, or an
 * empty body (`null` / `""`). Both are what the API returns for the window between
 * a file upload and the OCR voucher draft becoming readable.
 *
 * Anything else is re-thrown immediately and un-retried — a 401 or a 500 is not
 * going to resolve itself, and retrying would only delay a real error by 7 seconds.
 *
 * `delayMs` is injectable so tests run without fake timers; it is indexed by
 * attempt and falls back to its last entry.
 */
export declare function withProcessingRetry<T>(fn: () => Promise<T>, retries?: number, delayMs?: number[]): Promise<T>;
export declare function toolError(err: unknown): CallToolResult;
export declare function formatResponse(data: unknown): CallToolResult;
export declare function handleToolRequest(fn: (params: any) => Promise<unknown>): (params: any) => Promise<{
    [x: string]: unknown;
    content: ({
        type: "text";
        text: string;
        annotations?: {
            audience?: ("user" | "assistant")[] | undefined;
            priority?: number | undefined;
            lastModified?: string | undefined;
        } | undefined;
        _meta?: {
            [x: string]: unknown;
        } | undefined;
    } | {
        type: "image";
        data: string;
        mimeType: string;
        annotations?: {
            audience?: ("user" | "assistant")[] | undefined;
            priority?: number | undefined;
            lastModified?: string | undefined;
        } | undefined;
        _meta?: {
            [x: string]: unknown;
        } | undefined;
    } | {
        type: "audio";
        data: string;
        mimeType: string;
        annotations?: {
            audience?: ("user" | "assistant")[] | undefined;
            priority?: number | undefined;
            lastModified?: string | undefined;
        } | undefined;
        _meta?: {
            [x: string]: unknown;
        } | undefined;
    } | {
        uri: string;
        name: string;
        type: "resource_link";
        description?: string | undefined;
        mimeType?: string | undefined;
        size?: number | undefined;
        annotations?: {
            audience?: ("user" | "assistant")[] | undefined;
            priority?: number | undefined;
            lastModified?: string | undefined;
        } | undefined;
        _meta?: {
            [x: string]: unknown;
        } | undefined;
        icons?: {
            src: string;
            mimeType?: string | undefined;
            sizes?: string[] | undefined;
            theme?: "light" | "dark" | undefined;
        }[] | undefined;
        title?: string | undefined;
    } | {
        type: "resource";
        resource: {
            uri: string;
            text: string;
            mimeType?: string | undefined;
            _meta?: {
                [x: string]: unknown;
            } | undefined;
        } | {
            uri: string;
            blob: string;
            mimeType?: string | undefined;
            _meta?: {
                [x: string]: unknown;
            } | undefined;
        };
        annotations?: {
            audience?: ("user" | "assistant")[] | undefined;
            priority?: number | undefined;
            lastModified?: string | undefined;
        } | undefined;
        _meta?: {
            [x: string]: unknown;
        } | undefined;
    })[];
    _meta?: {
        [x: string]: unknown;
        progressToken?: string | number | undefined;
        "io.modelcontextprotocol/related-task"?: {
            taskId: string;
        } | undefined;
    } | undefined;
    structuredContent?: {
        [x: string]: unknown;
    } | undefined;
    isError?: boolean | undefined;
}>;