export type ErrorCode = "CONNECTION_REFUSED" | "TAB_NOT_FOUND" | "MAX_TABS_EXCEEDED" | "ELEMENT_NOT_FOUND" | "NAVIGATION_FAILED" | "API_KEY_REQUIRED" | "PROFILE_NOT_FOUND" | "PROFILE_ERROR" | "TIMEOUT" | "VALIDATION_ERROR" | "INTERNAL_ERROR";
export declare class AppError extends Error {
    readonly code: ErrorCode;
    readonly status?: number;
    constructor(code: ErrorCode, message: string, status?: number);
}
export interface ToolResult {
    [key: string]: unknown;
    isError?: boolean;
    content: Array<{
        type: "text";
        text: string;
    } | {
        type: "image";
        data: string;
        mimeType: string;
    }>;
}
export declare function okResult(data: unknown): ToolResult;
export declare function imageResult(base64Png: string): ToolResult;
export declare function binaryResult(base64: string, mimeType: string): ToolResult;
export declare function normalizeError(error: unknown): AppError;
export declare function toErrorResult(error: unknown): ToolResult;
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