/**
 * Router: pick which {@link Reasoner} handles an utterance.
 *
 * The default policy is `rule-first`: run the rule reasoner; if its plan is
 * confident enough (at or above the threshold) or no other reasoner is registered,
 * keep it; otherwise escalate to the highest-scoring other reasoner (an LLM, when
 * one is added in P4). With only the rule reasoner present this degrades cleanly to
 * rule-only, which is the no-LLM default.
 *
 * @see plans/ai-reasoning-layer-spec.md (section 4.8)
 */
import type { GridContext } from './context.js';
import type { Reasoner } from './reasoner.js';
import type { Plan } from './types.js';
export type RoutingPolicy = 'rule-only' | 'llm-only' | 'rule-first' | 'llm-first' | 'highest-score';
/** Chooses a reasoner and returns its plan. */
export interface Router {
    route(utterance: string, ctx: GridContext, reasoners: Reasoner[]): Promise<Plan>;
}
/** Options for {@link createRouter}. */
export interface RouterOptions {
    /** Default `'rule-first'`. */
    policy?: RoutingPolicy;
    /** Rule-plan confidence at/above which the router does NOT escalate. Default `0.5`. */
    threshold?: number;
}
/** Create the default {@link Router}. */
export declare function createRouter(options?: RouterOptions): Router;