/**
 * defineMenuHint — the tier-3 envelope's system-prompt half (SG-C):
 * an advisory note that fires exactly when the turn-start cascade left a MENU
 * outstanding, telling the model where the menu is and that STAY is a
 * first-class answer. `defineRelevanceHint`'s sibling, same anti-anchoring
 * framing: the offline router is a hint, never an order.
 *
 * The menu's DATA — candidate ids, descriptions, advisory relevance — rides
 * the `read_skill` tool description (rebuilt per iteration from the same
 * turn verdict; see `ReadSkillOffer.menu`), so the ids on the wire have ONE
 * source of truth and this injection's body can stay a static instruction.
 * Auto-registered by `AgentBuilder.build()` whenever the mounted graph can
 * produce a menu (classify or conversation continuity) and the posture is not
 * `'rails'` — a menu verdict with no envelope would be a decision the model
 * was never told about, the accepted-and-silently-wrong kind. Zero cost when
 * the trigger is false (the common iteration): reads `ctx.turnRoute`, which
 * only cascade graphs ever write.
 *
 * Add your own (custom id or body) with
 * `.injection(defineMenuHint({ ... }))` — the auto-registration then stands
 * down (it detects the marker, not the id).
 */
import type { Injection } from '../types.js';
export interface MenuHintOptions {
    /** Injection id (default `'skill-menu-hint'`). */
    readonly id?: string;
    /** Override the advisory body. The default names the mechanism (the
     *  read_skill description leads with the menu) and frames it as advisory. */
    readonly body?: string;
}
/**
 * The metadata marker that says "this injection is the turn-start menu
 * envelope" (the `READS_ENTRY_SCORES_METADATA_KEY` pattern). AgentBuilder
 * auto-registers a default hint only when NO registered injection carries the
 * marker — matching on the id would miss every renamed one and would
 * false-positive on somebody else's injection of that name.
 */
export declare const MENU_HINT_METADATA_KEY: "skillMenuHint";
export declare function defineMenuHint(options?: MenuHintOptions): Injection;