/**
 * Which agents are blocked until other agents finish, or until the user
 * answers, so a `wait` for a reply can tell when none can come soon: the
 * agent it asked is itself blocked on the asker, or on the user. Owned by the
 * {@link AgentRegistry} whose ids it names.
 */
/**
 * Stands in for the user among awaited ids: an agent with a dialog open that
 * waits for the user's answer (`ask`, a tool approval) holds on it. No agent id
 * can take this value.
 */
export declare const USER_AWAIT_ID = "@user";
/** Public surface of {@link AgentAwaits}, implemented locally on main and by a proxy in workers. */
export interface AgentAwaitsApi {
    /** Record `waiter` blocked until the first of `awaited` finishes; returns the release function. */
    hold(waiter: string, awaited: readonly string[], options: {
        interruptible: boolean;
    }): () => void;
    /**
     * Whether `agent` cannot act on a message `target` sent it at `sentAt` until `target` finishes;
     * with `target` {@link USER_AWAIT_ID}, whether it cannot act on a message sent at `sentAt` until the user answers.
     */
    blocksOn(agent: string, target: string, sentAt: number): boolean;
    /** Subscribe to hold changes; returns the unsubscribe function. */
    onChange(listener: () => void): () => void;
}
export declare class AgentAwaits implements AgentAwaitsApi {
    #private;
    /**
     * Record `waiter` blocked until the first of `awaited` finishes, until the
     * returned release runs. A block that waits for several agents together
     * takes one hold per agent.
     */
    hold(waiter: string, awaited: readonly string[], options: {
        interruptible: boolean;
    }): () => void;
    /**
     * Whether `agent` cannot act on a message `target` sent it at `sentAt`
     * until `target` finishes: one of its blocks waits only on `target`
     * (directly, or through agents blocked on it in turn), and the message
     * cannot end that block (it is not interruptible, or began after the
     * message arrived).
     */
    blocksOn(agent: string, target: string, sentAt: number): boolean;
    onChange(listener: () => void): () => void;
}