import { type DownloadedFile } from '../session/media.js';
import type { AgentResult } from '../types.js';
export interface SessionTokenUsage {
    input: number;
    output: number;
    cacheRead: number;
    cacheWrite: number;
    total: number;
}
export interface SessionContextUsage {
    tokens: number | null;
    contextWindow: number | null;
    percent: number | null;
}
export interface ChannelSessionStatus {
    sessionFile?: string;
    createdAt?: string;
    tokens?: SessionTokenUsage;
    contextUsage?: SessionContextUsage;
    statsSource: 'rpc' | 'jsonl' | 'none';
}
/**
 * Invoke pi agent as a subprocess.
 *
 * Each channel gets its own session directory so conversation history persists.
 * Uses `pi --session-dir <dir> --continue -p <message>` (print mode, no TUI).
 */
export declare function invokeAgent(channelFolder: string, userText: string, opts?: {
    model?: string;
    thinking?: string;
    cwd?: string;
    signal?: AbortSignal;
    attachments?: string | null;
}): Promise<AgentResult>;
export declare function buildAttachmentPathPrompt(downloaded: DownloadedFile[]): string;
export declare function getChannelSessionStatus(channelFolder: string, cwd?: string): Promise<ChannelSessionStatus>;