import type { RoundDelta } from "./messageDelta.js";
import { type PayloadLine } from "./payload.js";
import type { Round } from "./timeline/rounds.js";
export declare function hasSystemMessages(round: Round | undefined): boolean;
export type InputPayload = {
    lines: PayloadLine[];
    /** Where this call's new messages begin in `lines`: the divider, when
     *  the call has history. The overview opens the preview there. */
    newAt: number;
};
export type InputOptions = {
    systemsExpanded: boolean;
    /** Show the whole history, faded, instead of the stub of its last message. */
    historyExpanded: boolean;
    /** Print every tool result whole instead of its first RESULT_PREVIEW_CHARS. */
    fullResults: boolean;
};
/** Whether any tool result among the call's messages is longer than the
 *  preview keeps. */
export declare function hasCutToolResult(round: Round | undefined): boolean;
/** Whether the call carries messages a previous call on its thread sent. */
export declare function hasHistory(round: Round | undefined, delta: RoundDelta | undefined): boolean;
/** The recorded input. With the call's delta, the messages the previous
 *  call already had are history: folded, only the last of them shows, as
 *  its heading and first line plus a count of the rest; expanded, all of
 *  it shows, faded, with a divider where the new messages start. */
export declare function roundInputPayload(round: Round, options: InputOptions, delta?: RoundDelta): InputPayload;
/** `SYSTEM`, the prompt's first line as a signpost for where the reader
 *  is, and `… (+10 more lines · s to show)`; expanded, the whole prompt
 *  and `s to hide`. The overview and the transcript both draw this. */
export declare function systemPromptPayload(role: string, content: unknown, expanded: boolean): PayloadLine[];