import { type ChatSummary, type MutationHint } from "./types.js";
import { type DrizzleExecutor } from "../drizzle.js";
/**
 * Assigns one ready executable agent by updating chats, chatMembers, and chatUpdates after channel-manager authorization.
 * Keeping assignment, membership, channel history, and sync in one transaction prevents routing a turn to an inaccessible agent.
 */
export declare function channelDefaultAgentUpdate(executor: DrizzleExecutor, input: {
    actorUserId: string;
    chatId: string;
    agentUserId: string;
}): Promise<{
    chat: ChatSummary;
    hint: MutationHint;
}>;
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