import type { WorkflowAttemptCommand, WorkflowAttemptCompletion, WorkflowAttemptCompletionListener, WorkflowSessionExecutor as WorkflowSessionExecutorContract, Session } from "../shared/types.js";
import type { SessionManager } from "../sessions/manager.js";
export type WorkflowSessionReceiptReader = (sessionId: string) => {
    session: Session;
    finalText?: string;
} | null;
/** The sole adapter between the Workflow runtime and conversational execution. */
export declare class WorkflowSessionExecutor implements WorkflowSessionExecutorContract {
    private readonly sessions;
    private readonly readReceipt;
    constructor(sessions: SessionManager, readReceipt?: WorkflowSessionReceiptReader);
    startAttempt(command: WorkflowAttemptCommand): Promise<{
        sessionId: string;
    }>;
    stopAttempt(input: {
        sessionId: string;
        reason: string;
    }): Promise<void>;
    remind(input: {
        sessionId: string;
        text: string;
    }): Promise<void>;
    attemptState(sessionId: string): {
        idle: boolean;
        runningChildren: number;
    } | null;
    /** The engine thread a completed attempt session still holds and a new attempt
     *  could pick up, or null when there is nothing usable to continue from. */
    resumableEngineSession(sessionId: string, engine: string): string | null;
    subscribe(listener: WorkflowAttemptCompletionListener): () => void;
    readTerminalCompletion(sessionId: string): WorkflowAttemptCompletion | null;
}
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