/**
 * [WHO]: Provides pickThinkingLevelOnModelChange(), nextCyclicIndex() — pure model-cycle decisions
 * [FROM]: Depends on @catui/ai (Model), @catui/agent-core (ThinkingLevel)
 * [TO]: Consumed by core/runtime/model-controller.ts model switching/cycling
 * [HERE]: core/runtime/model-cycle.ts - stateless model-cycle logic, no session state
 *
 * Extracted from AgentSession: the pure decisions in setModel / cycleModel. The side-effecting
 * apply sequence (agent.setModel, persistence, emit) stays in the session.
 */
import type { Model } from "@catui/ai/types";
import type { ThinkingLevel } from "@catui/agent-core";
/**
 * Thinking level to use after switching to `model`, given the current level:
 * - model without reasoning → "off"
 * - reasoning model but currently "off" → "medium" (sensible default)
 * - otherwise keep the current level (the provider clamps to capabilities)
 */
export declare function pickThinkingLevelOnModelChange(model: Model<any>, currentLevel: ThinkingLevel): ThinkingLevel;
/** Next index when cycling through a list of length `length`. */
export declare function nextCyclicIndex(currentIndex: number, length: number, direction: "forward" | "backward"): number;