import type { Employee, Engine, JinnConfig } from "../shared/types.js";
import { type EngineName } from "../shared/models.js";
/** What a routed turn brought with it about where the session should run. */
export interface NewSessionEnginePreference {
    engine?: string;
    model?: string;
    effortLevel?: string;
    employee?: Employee;
}
/**
 * The engine, model and effort level a NEW routed session starts on.
 *
 * An engine the caller named wins, and so does a named model — a model belongs
 * to exactly one engine. Anything else is a preference, so an engine whose
 * allowance is spent gives way to the first member of its chain that can serve
 * the turn.
 */
export declare function newSessionEngineSelection(config: JinnConfig, engines: Map<string, Engine>, preference: NewSessionEnginePreference): {
    engine: EngineName;
    model?: string;
    effortLevel?: string;
};
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