/**
 * Standard Schema（https://standardschema.dev）：zod ≥3.24 / zod 4 / valibot / arktype 都实现了这个接口。
 * SDK 只依赖这个最小接口，不依赖任何校验库——应用自带 zod 即可（技术方案 18 §B）。
 */
export interface StandardSchemaV1<Input = unknown, Output = Input> {
    readonly '~standard': {
        readonly version: 1;
        readonly vendor: string;
        readonly validate: (value: unknown) => StandardResult<Output> | Promise<StandardResult<Output>>;
        readonly types?: {
            readonly input: Input;
            readonly output: Output;
        };
    };
}
export type StandardResult<T> = {
    value: T;
    issues?: undefined;
} | {
    issues: ReadonlyArray<{
        message: string;
        path?: ReadonlyArray<PropertyKey | {
            key: PropertyKey;
        }>;
    }>;
};
export declare function isStandardSchema(value: unknown): value is StandardSchemaV1;
/** 把 issues 压成一行可读信息（给错误消息与 ai.json 的重试提示用） */
export declare function formatIssues(issues: ReadonlyArray<{
    message: string;
    path?: ReadonlyArray<PropertyKey | {
        key: PropertyKey;
    }>;
}>): string;
/** 用 Standard Schema 校验；失败抛 AppSdkError(code)，消息含前几条 issue */
export declare function validateWith<T>(schema: StandardSchemaV1<unknown, T>, value: unknown, code?: string, what?: string): Promise<T>;