import type { SessionManager } from "@caupulican/pi-agent-core/node";
import { type SessionSnapshotPayload } from "../session-snapshot.ts";
import { type TaskStepsState } from "./task-state.ts";
export declare const TASK_STEPS_STATE_CUSTOM_TYPE = "task_steps_state";
export type TaskStepsStateSnapshotPayload = SessionSnapshotPayload<"state", TaskStepsState>;
export declare function appendTaskStepsStateSnapshot(sessionManager: Pick<SessionManager, "appendCustomEntry">, state: TaskStepsState): string;
/** Pure payload decode: validates + clones a task-steps snapshot payload. No SessionManager access,
 * so unit tests can exercise decoding directly against a constructed `data` value. */
export declare function decodeTaskStepsStateSnapshotPayload(data: unknown): TaskStepsState | undefined;
/**
 * Most recent VALID task-steps snapshot on the active branch. Walks leaf→root ancestry via
 * `getLatestCustomEntryOnBranch`, skipping entries whose payload fails to decode and resuming
 * the search from that entry's parent, so an older valid snapshot still wins over a newer
 * malformed one (matches the pre-branch-scoping flat-list resolution semantics).
 */
export declare function getLatestTaskStepsStateSnapshot(sessionManager: Pick<SessionManager, "getLatestCustomEntryOnBranch">): TaskStepsState | undefined;
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