export interface AutoDetectInput {
    env?: NodeJS.ProcessEnv;
}
export interface AutoDetectResult {
    /** The chosen default model id. */
    modelId: string;
    /** Optional human-readable note for stderr (e.g. multi-key conflict). */
    note: string | null;
}
/**
 * When the user has not passed `--model`, pick a default based on which
 * provider API key is present in the environment.
 *
 * - Exactly one provider key set → that provider's canonical model.
 * - Multiple keys set → fall back to the existing default with a stderr note.
 * - No keys set → existing default behavior.
 */
export declare const autoDetectDefaultModel: (input?: AutoDetectInput) => AutoDetectResult;
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