/**
 * Model selection — resolve the (provider, model) the engine generates with,
 * from CLI flags → SKILLET_* env → the built-in openai default. Validation and the
 * API-key check are added in later tasks. The engine accepts the resolved Model via
 * GenerateOptions.model and never picks a provider itself.
 */
import { getModel } from '@earendil-works/pi-ai';
export declare class ModelResolutionError extends Error {
    constructor(message: string);
}
export interface ResolvedModel {
    model: ReturnType<typeof getModel>;
    provider: string;
    modelId: string;
}
/**
 * Provider → API-key env var(s). Mirrors pi-ai's internal (unexported) table so the error
 * can name the exact var (it is NOT a naive <PROVIDER>_API_KEY — e.g. google→GEMINI_API_KEY)
 * and so we recognize API-key providers. Drift-guarded by a test in model.test.ts.
 */
export declare const KEY_ENV_VARS: Record<string, string[]>;
export declare function resolveModel(opts?: {
    provider?: string;
    modelId?: string;
}): ResolvedModel;
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