/**
 * Machine-readable error codes surfaced to the MCP client. Deliberately coarse
 * and free of any spec content or credentials.
 */
export type ErrorCode = "config_error" | "validation_error" | "auth_error" | "payment_required" | "rate_limited" | "backend_error" | "timeout" | "network_error" | "not_available";
/**
 * The only error type this server throws outward. Its message is safe to show
 * an end user: it never contains spec content, API keys, JWTs, or request bodies.
 */
export declare class SpecShieldError extends Error {
    readonly code: ErrorCode;
    readonly status?: number | undefined;
    constructor(code: ErrorCode, message: string, status?: number | undefined);
    /** Structured, safe payload for a tool's `isError` result. */
    toPayload(): {
        error: {
            code: ErrorCode;
            message: string;
            status?: number;
        };
    };
}
export declare class ConfigError extends SpecShieldError {
    constructor(message: string);
}