/**
 * The `lookup_user` helper behind outbound mentions-as-a-tool (spec §6.1).
 * Ships as a plain builder this milestone — later rollout steps register it
 * as a capability/tool-face (plan Decision 16).
 */
import type { ChannelAdapter } from "../adapter.js";
import type { ActorQuery } from "../types.js";
import type { MentionRenderer } from "./render.js";
/** The `lookup_user` tool shape: query a platform user, get a mention token to paste. */
export type LookupUserTool = {
    name: "lookup_user";
    description: string;
    run(query: ActorQuery): Promise<{
        found: boolean;
        mentionToken?: string;
        displayName?: string;
    }>;
};
/** Builds the lookup tool over an adapter; later rollout steps register it as a capability/tool-face. */
export declare function buildLookupUserTool(adapter: ChannelAdapter, renderer: MentionRenderer): LookupUserTool;
/** Prompt fragment instructing the model to call lookup_user and paste the token verbatim. */
export declare const LOOKUP_USER_PROMPT_FRAGMENT: string;
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