/**
 * toolEndEmitter — shared helper for emitting `tool:end` events from
 * AI-SDK `onStepFinish` callbacks.
 *
 * Pipeline B (metrics aggregator) listens for `tool:end` on the NeuroLink
 * EventEmitter. When tools are executed by the AI SDK internally (via
 * `generateText` / `streamText`) the SDK calls `onStepFinish` with the
 * completed tool results. Without this helper those results are silently
 * stored but never surfaced as `tool:end` events, leaving Pipeline B with
 * zero tool spans for AI-SDK-driven tool calls (gaps G5 and S2).
 *
 * @module utils/toolEndEmitter
 */
import type { NeuroLinkEvents, StepToolResult, TypedEventEmitter } from "../types/index.js";
/**
 * Emit a `tool:end` event for every completed tool result in an
 * `onStepFinish` callback.
 *
 * @param emitter - The NeuroLink event emitter (obtained via
 *   `neurolink.getEventEmitter()`).  When `undefined` the function is a
 *   no-op so callers need not guard every call site.
 * @param toolResults - The `toolResults` array from `onStepFinish`.  When
 *   `undefined` or empty the function is a no-op.
 */
export declare function emitToolEndFromStepFinish(emitter: TypedEventEmitter<NeuroLinkEvents> | undefined, toolResults: StepToolResult[] | undefined): void;