/** Error raised by the client (config / transport / validation) or relayed from the server. */
export declare class CortexClientError extends Error {
    readonly kind: "config" | "validation" | "transport" | "upstream";
    /** Server-supplied error code, when kind === "upstream". */
    readonly code?: string | undefined;
    constructor(kind: "config" | "validation" | "transport" | "upstream", message: string, 
    /** Server-supplied error code, when kind === "upstream". */
    code?: string | undefined);
}
/** Exit codes — agents branch on these, so they are part of the contract. */
export declare const EXIT: {
    readonly ok: 0;
    readonly unknown: 1;
    readonly config: 2;
    readonly validation: 3;
    readonly upstream: 4;
    readonly transport: 5;
};
export declare function exitCodeFor(err: unknown): number;
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