/**
 * Router embedder (ADR-390).
 *
 * `hooks_route` compares a task with each agent pattern's keywords in a 384-d
 * vector index. Historically both sides came from a character hash
 * (`generateSimpleEmbedding`), which measures spelling, not meaning. This
 * module lets the router use the local sentence model (all-MiniLM-L6-v2, 384-d)
 * instead, with the hash as the fallback.
 *
 * Rules (ADR-390 §Decision):
 *  - The MiniLM path uses `generateLocalEmbedding` ONLY. Never the bridge-first
 *    `generateEmbedding` — that recursed without bound in #2312.
 *  - One embedder per index: if ANY text cannot be embedded by the real model
 *    (throw, backend !== 'onnx', or a non-384 vector), EVERY text in the call
 *    is embedded with the hash, and the result says so.
 *  - The default stays `hash` until ADR-391's benchmark says otherwise.
 *
 * Selection: `CLAUDE_FLOW_ROUTER_EMBEDDER=minilm|hash`. The router index is
 * process-lifetime state, so the env var is read when the index is (re)built,
 * not per CLI invocation.
 */
export type RouterEmbedderKind = 'minilm' | 'hash';
/** Default embedder. ADR-391 decides whether this flips to 'minilm'. */
export declare const DEFAULT_ROUTER_EMBEDDER: RouterEmbedderKind;
/** Dimension of the router index (VectorDb + SemanticRouter are built at 384). */
export declare const ROUTER_EMBEDDING_DIM = 384;
export declare const ROUTER_EMBEDDER_ENV = "CLAUDE_FLOW_ROUTER_EMBEDDER";
export interface RouterEmbedderSelection {
    kind: RouterEmbedderKind;
    /** Set when the requested value was invalid and the default was used. */
    reason?: string;
}
export interface RouterEmbeddingResult {
    vectors: Float32Array[];
    /** The embedder that actually produced `vectors` (after any degradation). */
    embedder: RouterEmbedderKind;
    /** Why the result is `hash` when `minilm` was requested. */
    reason?: string;
}
/**
 * Resolve which embedder the router should use.
 * Precedence: explicit override > CLAUDE_FLOW_ROUTER_EMBEDDER > DEFAULT_ROUTER_EMBEDDER.
 */
export declare function resolveRouterEmbedder(override?: RouterEmbedderKind, env?: NodeJS.ProcessEnv): RouterEmbedderSelection;
/**
 * Deterministic character-hash embedding (the router's historical embedder).
 * Moved verbatim from hooks-tools.ts; do not change the math — existing routes
 * and thresholds were calibrated against it.
 */
export declare function generateSimpleEmbedding(text: string, dimension?: number): Float32Array;
/**
 * Embed texts for the router. All vectors in one result come from ONE embedder.
 * `hash` never touches the model (no load cost for default users).
 */
export declare function embedForRouter(texts: readonly string[], kind?: RouterEmbedderKind): Promise<RouterEmbeddingResult>;
/** Test hook: clear the MiniLM vector memo. */
export declare function clearRouterEmbedderCache(): void;
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