/**
 * Transcript assembly for the LLM-role copilot mode.
 *
 * Builds a role-labeled plain-text transcript of the tail window of a
 * session's conversation, for consumption by the copilot decision policy
 * and prompt builder. This module owns NO prompt template text — it only
 * formats. On read failure or timeout it returns null and the caller
 * treats that as "no transcript available".
 */
import type { ISessionClient } from "../platform/ports/session-client.ts";
export interface TranscriptOptions {
    /** Number of most recent messages to include in the transcript window. */
    window_size: number;
    /** Hard cap on the returned transcript length; tail-truncated when exceeded. */
    max_chars: number;
    /** When true, append brief one-line summaries of tool results; when false, drop tool parts. */
    include_tools: boolean;
}
/**
 * Assemble a role-labeled plain-text transcript of the tail window of a
 * session's conversation.
 *
 * - Reads messages via `client.messages(sid, { limit: window_size })`,
 *   guarded by `withTimeout` (ROLEBOX_CLIENT_TIMEOUT_MS override applies,
 *   see src/utils/timeout.ts). The tail window is enforced defensively
 *   even if the client returns more messages than requested.
 * - Emits `user: <text>` / `assistant: <text>` lines from text parts. When
 *   `include_tools` is true, tool results are appended as brief one-line
 *   summaries; when false, tool parts are dropped entirely.
 * - Enforces `max_chars` by TAIL truncation: keeps the most recent content.
 * - Returns null on read failure or timeout; returns "" for an empty window.
 */
export declare function assembleTranscript(client: ISessionClient, sid: string, opts: TranscriptOptions): Promise<string | null>;
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