import type { AdapterKey, StepDefinition } from "./types.js";
export declare const DEFAULT_TASK_ADAPTER: AdapterKey;
export declare const SUPPORTED_ADAPTERS: readonly AdapterKey[];
export declare function resolveTaskAdapter(adapter?: AdapterKey): AdapterKey;
/**
 * Resolves the adapter and payload the engine will use for a step's agent validator
 * (validation.mode "agent"), or null when the step has no agent validator.
 * The validator inherits the step's adapter when validation.agent.adapterKey is not
 * set, and inherits an explicit useRealAdapter: false opt-out from the step payload
 * unless the validator payload sets its own useRealAdapter — so a step opted out to
 * mock never silently spawns a real agent to validate itself.
 */
export declare function resolveValidatorAgentSpec(step: StepDefinition): {
    adapterKey: AdapterKey;
    payload: Record<string, unknown>;
} | null;