import * as z from "zod/v4";
/**
 * Fallback model to try when the primary model fails or refuses. Only the `model` field is supported; per-attempt overrides are rejected.
 */
export type MessagesFallbackParam = {
    model: string;
    additionalProperties?: {
        [k: string]: any;
    } | undefined;
};
/** @internal */
export type MessagesFallbackParam$Outbound = {
    model: string;
    [additionalProperties: string]: unknown;
};
/** @internal */
export declare const MessagesFallbackParam$outboundSchema: z.ZodType<MessagesFallbackParam$Outbound, MessagesFallbackParam>;
export declare function messagesFallbackParamToJSON(messagesFallbackParam: MessagesFallbackParam): string;
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