/**
 * StreamingResponseAccumulator — reassembles a complete `ProviderResponse`
 * ({ content, tool_calls }) from a stream of `StreamDelta`s.
 *
 * Provider streams frequently split a tool call's JSON `arguments` across many
 * deltas; this buffers each tool call by index and concatenates the fragments,
 * so `runAgentLoop` receives well-formed, complete tool calls to execute.
 */
import type { ProviderResponse } from '../providers/types.js';
import type { Usage } from './types.js';
export declare class StreamingResponseAccumulator {
    private text;
    private toolCalls;
    private usage;
    appendText(delta: string): void;
    beginToolCall(index: number, id: string, name: string): void;
    appendToolCallArgs(index: number, argsDelta: string): void;
    setUsage(usage: Usage): void;
    getUsage(): Usage | undefined;
    toResponse(): ProviderResponse;
}