import type { BackgroundTask } from "#execution/tasks/parent/delegate.js";
import type { HarnessSession } from "#harness/types.js";
import type { JsonObject, JsonValue } from "#shared/json.js";
declare const TASK_MESSAGE_KIND: "eve:task-message";
export type TaskMessage = JsonObject & {
    readonly kind: typeof TASK_MESSAGE_KIND;
    readonly message: string;
};
export declare function createTaskMessage(message: string): TaskMessage;
export declare function isTaskMessage(value: unknown): value is TaskMessage;
/** Opaque, framework-private address used to control a task executor. */
export interface TaskExecutorBinding {
    readonly kind: string;
    readonly data: JsonObject;
}
/** @deprecated Use workflow-backed background tools with yield descriptors. */
export interface TaskBinding {
    readonly taskId: string;
    readonly token: string;
    readonly url?: string;
}
/** @deprecated Use workflow-backed background tools with yield descriptors. */
export type TaskSendCommand = {
    readonly kind: "update";
    readonly message: string;
} | {
    readonly kind: "complete";
    readonly data: JsonValue;
} | {
    readonly kind: "fail";
    readonly data: JsonValue;
} | {
    readonly kind: "cancel";
};
/** Fixed acknowledgement returned when a background task is admitted. */
export interface TaskReceipt {
    readonly status: "working";
    readonly taskId: string;
}
/** Capability passed only to tools declared with `execution: "background"`. */
export interface TaskExec {
    /** Model-facing durable task identity. */
    readonly taskId: string;
    /** Returns a descriptor which sends one message to the parent when yielded. */
    postMessage(message: string): TaskMessage;
    /** @deprecated Use yields from a workflow-backed background tool. */
    readonly binding: TaskBinding;
    /** @deprecated Use yields from a workflow-backed background tool. */
    readonly send: (command: TaskSendCommand) => Promise<void>;
    /** @deprecated Use ctx.session. */
    readonly session: HarnessSession;
    /** @deprecated Framework-owned task internals are not part of the authoring API. */
    readonly task: BackgroundTask;
}
export {};