export declare function updateCodexThreadRuntime(input: {
    threadId: string;
    model?: string | null;
    effort?: 'low' | 'medium' | 'high' | 'xhigh' | null;
}): Promise<{
    model: string | null;
    reasoningEffort: string | null;
}>;
export declare function readCodexThreadRuntimeSnapshot(threadId: string): {
    model: string | null;
    reasoningEffort: string | null;
};
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