import type { Delegation } from "./types.js";
/** Resume strategy determined by inspecting a persisted delegation record. */
export type ResumeStrategy = {
    action: "reuse";
    sessionId: string;
    reason: string;
} | {
    action: "stack-on";
    sessionId: string;
    reason: string;
} | {
    action: "fresh";
    reason: string;
};
/**
 * REQ-RC-01: Determines whether a persisted delegation can be resumed,
 * stacked onto, or needs a fresh dispatch.
 *
 * Strategy priority:
 * 1. `reuse`    — Session is non-terminal AND resumable AND still exists
 * 2. `stack-on` — Session is terminal BUT still exists in the SDK; new work
 *                 can be attached as a child. The SDK accepts stacking via
 *                 `task_id` / `parentSessionId` for any valid session ID.
 * 3. `fresh`    — Session no longer exists or is not resumable
 *
 * @param delegation - The persisted delegation record to evaluate.
 * @param sessionExists - Whether the child session still exists in the host runtime.
 * @returns A ResumeStrategy indicating reuse, stack-on, or fresh dispatch with a reason.
 */
export declare function resolveResumeStrategy(delegation: Delegation, sessionExists: boolean): ResumeStrategy;
/**
 * REQ-RC-01: Builds a continuation prompt that references the original task
 * without repeating the full prompt payload.
 *
 * @param delegation - The delegation to build a continuation prompt for.
 * @returns A concise continuation prompt referencing the original task and current state.
 */
export declare function buildContinuationPrompt(delegation: Delegation): string;
/**
 * Builds a context-preserving prompt for stacking onto a terminal session.
 * Unlike buildContinuationPrompt (for resuming interrupted work), this
 * acknowledges the previous session's terminal state and frames the new
 * work as a follow-up or retry.
 *
 * @param delegation - The terminal delegation to stack onto.
 * @param customPrompt - Optional custom prompt. If omitted, builds a retry prompt.
 * @returns A stack-on prompt that preserves context from the original session.
 */
export declare function buildStackOnPrompt(delegation: Delegation, customPrompt?: string): string;
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