import { type TaskRunCommands } from "#execution/tasks/table.js";
import { type SessionStepState } from "#execution/publish-session-events.js";
import { type SessionStateTransition } from "#execution/session/state-delta.js";
import type { WorkflowToolRunMessage } from "#execution/tools/workflow/messages.js";
import type { TaskCancelReason } from "#protocol/message.js";
/** The messages a task's run sends that change its record. */
export type TaskRunMessage = Extract<WorkflowToolRunMessage, {
    readonly kind: "outcome" | "reply" | "started" | "usage";
}>;
/** Applies one message from a task's run: started, a reply, usage no reply carried, or the run's outcome. */
export declare function applyTaskRunMessageStep(input: SessionStepState & {
    readonly message: TaskRunMessage;
}): Promise<SessionStateTransition>;
/**
 * Cancels tasks: their calls settle as cancelled and their runs are told to
 * stop. A run ends itself within its cleanup deadline and reports cancelled.
 * A `task()` run's cancel settles every request it relayed, so the session
 * withdraws them in the same step and accepts no answer after it. A `serve()`
 * run withdraws its stretch's questions itself, and the session decides each one.
 */
export declare function cancelTasksStep(input: SessionStepState & TaskCancellationInput): Promise<SessionStateTransition>;
interface TaskCancellationInput {
    readonly reason: TaskCancelReason;
    readonly taskIds: readonly string[];
}
/**
 * Sends commands to a task's run, in order. A run that already finished takes
 * none; its outcome settles any call still waiting.
 */
export declare function sendTaskRunCommands(commands: TaskRunCommands): Promise<void>;
export {};