/**
 * Artifact banking (N3) — bank the whole payload, hand back a pointer.
 *
 * A long-running agent produces outputs that do not fit in a conversation:
 * a worker's full report, a build log, a stage's structured result. The wrong
 * answer is to truncate one and send the head — the discarded bytes are gone
 * and nothing records that they existed. The right answer is to write the
 * payload to disk in full and put a bounded preview plus a read-back call in
 * the conversation, so the model can pull as much of the rest as it needs,
 * whenever it needs it, and compaction can evict the preview without costing
 * anything.
 *
 * Read-back is the tool that already exists: `retrieve_context({ artifactId,
 * offset, limit })` paginates any artifact and reports `totalSize` / `hasMore`.
 * There is no second read tool and no second storage layer — this module is a
 * thin, typed front door onto the instance's artifact store (local temp,
 * Redis, or injected), the same store the MCP output normalizer externalizes
 * into.
 *
 * The one thing it adds is that the store no longer has to pre-exist: it is
 * created on first use, whether or not `mcp.outputLimits` was ever configured,
 * and `retrieve_context` is registered along with it.
 *
 * @module artifacts/artifactBanking
 */
import type { NeuroLink } from "../neurolink.js";
import type { ArtifactPageRequest, ArtifactStore, BankArtifactOptions, BankedArtifactRef } from "../types/index.js";
/**
 * The artifact store for this instance, created on first use.
 *
 * Lazy creation lives on the host rather than here because both pieces of it
 * are private to `NeuroLink`: the store field the `retrieve_context` closure
 * reads, and the registration of that tool. Calling it through the host is
 * what makes a banked artifact readable by the model, not just by host code.
 */
export declare function ensureArtifactStore(host: NeuroLink): ArtifactStore;
/**
 * Write a payload to the artifact store and return a reference to it.
 *
 * The payload is stored whole. The returned `preview` is a bounded head slice
 * for the conversation, and `readBackHint` is the call that fetches the rest.
 *
 * @param host     Instance whose artifact store (and `retrieve_context`) to use.
 * @param payload  The complete text or JSON payload. Never truncated.
 * @param options  What this is (`kind` / `label`) and how big a preview to cut.
 */
export declare function bankArtifact(host: NeuroLink, payload: string, options: BankArtifactOptions): Promise<BankedArtifactRef>;
/**
 * Read a banked payload back from host code — the programmatic twin of the
 * `retrieve_context` tool the model uses.
 *
 * Returns the FULL payload when `page` is omitted; there is no hidden cap,
 * because a host that asks for the artifact is asking for the artifact.
 * Returns null when the id is unknown or the file is gone.
 *
 * With a `page`, a backend that supports range reads moves only the window
 * (see `readArtifactWindow`) — the same path `retrieve_context` takes.
 *
 * @param page Character window. `offset` defaults to 0, `limit` to the rest.
 */
export declare function readArtifact(host: NeuroLink, id: string, page?: ArtifactPageRequest): Promise<string | null>;