/**
 * Core `read-attachment` agent tool.
 *
 * Large text pastes, CSVs, JSON files, and code files are truncated to
 * 60 K chars when injected into the model context. This action lets the agent
 * read the full content in offset/limit slices from the durable resource
 * stored at attach-time.
 *
 * Storage: text-y attachments are persisted as `agent_scratch` resources
 * keyed  `attachments/<threadId>/<sanitised-name>` under the owner's scope.
 * The maximum stored size per attachment is 20 MB.
 */
import type { ActionEntry } from "../agent/production-agent.js";
/**
 * Determine whether a MIME type or filename represents a text-like attachment
 * that should be stored as a durable resource for paginated reads.
 */
export declare function isTextLikeMimeType(contentType: string | undefined): boolean;
export declare function isTextLikeFilename(name: string | undefined): boolean;
/**
 * Persist text-ish attachments from a chat turn as thread-scoped resources
 * so the agent can later read them in slices via `read-attachment`.
 *
 * Silently skips attachments that aren't text-like or have no text content.
 * Returns a map from attachment index → stored resource id for use in the
 * truncation-notice injected into the model context.
 */
export declare function persistTextAttachmentsAsResources(opts: {
    attachments: Array<{
        type?: string;
        name?: string;
        contentType?: string;
        text?: string;
    }>;
    threadId: string;
    ownerEmail: string | null | undefined;
}): Promise<Map<number, {
    resourceId: string;
    path: string;
    totalChars: number;
}>>;
export declare function createCoreAttachmentActionEntries(): Record<string, ActionEntry>;
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