import { type DrizzleExecutor } from "../drizzle.js";
import { type ChatSummary, type MutationHint } from "./types.js";
/**
 * Updates the chats.agentModelId durable choice for one post-capable member and advances that
 * chat's ordered sync point. This action keeps current and future agent sessions on the same
 * Rig model after reconnect or restart, while its transaction makes the visible chat projection
 * and delivery hint inseparable.
 */
export declare function chatModelUpdate(executor: DrizzleExecutor, input: {
    actorUserId: string;
    chatId: string;
    modelId: string;
}): Promise<{
    chat: ChatSummary;
    hint?: MutationHint;
}>;
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