import type { MaterializedResultRef, SessionMessageSnapshot } from "../types.ts";
import type { TaskLifecycleDeps } from "../core/lifecycle-shared.ts";
/**
 * Get materialized result for a task.
 * Checks: task.result cache → lazy backward-compat fetch → orphaned sidecar → expired/not_found.
 */
export declare function getResult(d: TaskLifecycleDeps, taskId: string): Promise<{
    kind: "ok" | "expired" | "not_found" | "fetch_error";
    text: string;
    resultText: string;
    hadFence: boolean;
    totalChars: number;
    error?: string;
}>;
/**
 * Materialize a task's output by fetching session messages and writing a sidecar file.
 */
export declare function materializeResult(d: TaskLifecycleDeps, taskId: string): Promise<MaterializedResultRef>;
/**
 * Extract the final assistant answer from session messages,
 * starting from the given boundary index.
 *
 * Walks messages from `boundary` forward and returns the text of the LAST
 * assistant message that carries a non-empty text part. Messages whose parts
 * are only tool/reasoning content (no text) are ignored, so tool-result echo
 * that some adapters (e.g. Pi) misclassify as assistant text does not pollute
 * the answer.
 *
 * The returned text is the raw message text — any ```result fence inside it
 * is preserved verbatim, so the caller's existing `extractResultBlock` pass
 * still extracts the fence from the final answer.
 *
 * Returns `null` when no assistant message carries text; the caller falls
 * back to the legacy full-concatenation behavior in that case.
 */
export declare function extractFinalAssistantText(messages: readonly SessionMessageSnapshot[], boundary: number): string | null;
/**
 * Build the assistant output text from session messages,
 * starting from the given boundary index.
 *
 * Uses the LAST assistant message that carries a non-empty text part, so
 * intermediate tool-result echo (misclassified as assistant text by some
 * adapters) never pollutes the result. Falls back to concatenating all
 * assistant text parts only when no assistant text exists at all.
 */
export declare function buildAssistantText(messages: readonly SessionMessageSnapshot[], boundary: number): string;
/**
 * Materialize result for a completed task and notify the parent.
 * Only adds to notifyOutbox for final notifications (remainingTasks === 0).
 */
export declare function materializeAndNotify(d: TaskLifecycleDeps, taskId: string): Promise<void>;
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