import type { ToolResultSlice, ToolResultStore } from "../../core/tool-result-store.js";
/**
 * design/80 §2.5 — file {@link ToolResultStore}: write-once-idempotent, ONE file per ref.
 *
 * `ref = tr_<sessionId>_<toolCallId>` (engine-minted, already globally unique). `put` is an
 * `O_CREAT|O_EXCL` create (`"wx"`) → on `EEXIST` it SILENTLY no-ops (write-once-idempotent; never
 * re-writes — a re-write risks a non-identical preview and breaks the prompt cache, §2.5 / the in-memory
 * store's `if (!map.has(ref))`). Content is fsync'd before return. `get` slices the file by `{offset,
 * limit}` over CHARS to match `ToolResultSlice.totalChars` semantics; an unknown ref → `undefined` (the
 * model is told it's gone — degrades, never crashes). `withToolResultOffload` joins text with `\n` and
 * stores the joined string verbatim, so the char-offset slice here is exactly the in-memory store's slice.
 */
export declare class FileToolResultStore implements ToolResultStore {
    private readonly dir;
    constructor(root: string);
    private pathFor;
    put(ref: string, content: string): void;
    get(ref: string, opts?: {
        offset?: number;
        limit?: number;
    }): ToolResultSlice | undefined;
}
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