import { type CreateSessionRequest } from "../shared/types.js";
export declare function validateInitialAttachments(attachments: CreateSessionRequest["initialAttachments"]): void;
/**
 * Prepare the first turn before the CLI exists; there is no synthetic PTY
 * Enter. Files are materialized into the session's cwd, then the prompt is
 * composed in one order (`buildFirstPrompt`): the idea, the files, the
 * linked sources, the session setup.
 *
 * Creating the agent is NOT this function's job any more: the session-side
 * `scaffold` option is gone (flow-creation.md §4.4 step 4). The harness
 * scaffolds through `POST /api/agents/scaffold` before any session opens, so
 * a session request always names a folder that already exists.
 */
export declare function prepareFirstRequest(request: CreateSessionRequest): Promise<string | undefined>;
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