/**
 * Public constants — MUST stay in sync with `Route` in `types.ts`.
 *
 * The label prefix passed to Jina (zero-shot) and the canonical name a
 * few-shot classifier MUST be trained against share the same literal
 * values as the `Route` union ("NONE" | "WORLD_ONLY" | "EXPERIENCE_ONLY"
 * | "ALL"). If they diverged, the classifier path would always fall back
 * to "ALL" because `isKnownRoute` would reject the predicted label.
 */
export declare const ROUTE_NONE = "NONE";
export declare const ROUTE_WORLD_ONLY = "WORLD_ONLY";
export declare const ROUTE_EXPERIENCE_ONLY = "EXPERIENCE_ONLY";
export declare const ROUTE_ALL = "ALL";
/**
 * Binary labels (NONE / ALL) used by default.
 *
 * The dominant value of the router for Hindsight is the NONE decision:
 * skipping recall on heartbeats, agent meta-questions, and test pings.
 * Distinguishing WORLD vs EXPERIENCE is a refinement that requires a
 * deliberately trained few-shot classifier (or a custom label list) to
 * be reliable — zero-shot with 4 fuzzy semantic classes drops in
 * precision on short FR prompts.
 *
 * When an operator wants finer routing, they pass `routes: 4` (which
 * uses {@link DEFAULT_ROUTER_LABELS_4}) or a fully custom
 * `recallRouter.labels` array.
 */
export declare const DEFAULT_ROUTER_LABELS_2: readonly string[];
/**
 * Fine-grained 4-class labels for operators who explicitly opt in to
 * narrower routing. Selecting `routes: 4` or passing custom labels enables
 * separate WORLD_ONLY and EXPERIENCE_ONLY decisions.
 */
export declare const DEFAULT_ROUTER_LABELS_4: readonly string[];
/**
 * Backward-compatible alias. Existing callers can keep importing
 * `DEFAULT_ROUTER_LABELS` and get the 2-class default.
 */
export declare const DEFAULT_ROUTER_LABELS: readonly string[];
/**
 * The label names that the classifier may legitimately return.
 * Used by the defensive parser to refuse hallucinated classes.
 */
export declare const ROUTER_LABEL_NAMES: readonly string[];
/**
 * Extract the route name from a full label string (the part before the
 * colon). Returns `null` when the label is malformed.
 *
 * @internal exported for unit testing
 */
export declare function extractRouteFromLabel(label: string): string | null;