export interface RuntimeResolutionOptions {
    env?: NodeJS.ProcessEnv;
    commandExists?: (command: string, env: NodeJS.ProcessEnv) => boolean;
    lang?: 'zh' | 'en';
}
export interface RuntimeSelection {
    executor: string;
    model: string;
    judgeModel: string;
}
export declare function commandExistsOnPath(command: string, env?: NodeJS.ProcessEnv): boolean;
export declare function isCodexHost(env?: NodeJS.ProcessEnv): boolean;
export declare function isCodexExecutor(executor: string): boolean;
export declare function resolveCliExecutor(explicitExecutor?: string, options?: RuntimeResolutionOptions): string;
export declare function resolveCliModel(executor: string, explicitModel?: string, options?: RuntimeResolutionOptions): string;
export declare function defaultJudgeModel(executor: string, taskModel: string): string;
export declare function resolveRuntimeSelection(input: {
    executor?: string;
    model?: string;
}, options?: RuntimeResolutionOptions): RuntimeSelection;
export declare function envJudgeModels(env?: NodeJS.ProcessEnv): string | undefined;