import { Tool, ToolCallEngine, ParsedModelResponse, PrepareRequestContext, AgentSingleLoopReponse, MultimodalToolCallResult, ChatCompletionChunk, ChatCompletionMessageParam, ChatCompletionCreateParams, StreamProcessingState, StreamChunkResult } from '@multimodal/agent-interface';
/**
 * A Tool Call Engine based on native Function Call.
 */
export declare class NativeToolCallEngine extends ToolCallEngine {
    private logger;
    preparePrompt(instructions: string, tools: Tool[]): string;
    prepareRequest(context: PrepareRequestContext): ChatCompletionCreateParams;
    /**
     * Initialize stream processing state for native tool calls
     */
    initStreamProcessingState(): StreamProcessingState;
    /**
     * Process a streaming chunk for native tool calls
     * For native engines, we can directly use the tool_calls property
     */
    processStreamingChunk(chunk: ChatCompletionChunk, state: StreamProcessingState): StreamChunkResult;
    /**
     * Process tool calls data from a chunk
     */
    private processToolCallsInChunk;
    /**
     * Finalize the stream processing and extract the final response
     */
    finalizeStreamProcessing(state: StreamProcessingState): ParsedModelResponse;
    buildHistoricalAssistantMessage(currentLoopResponse: AgentSingleLoopReponse): ChatCompletionMessageParam;
    buildHistoricalToolCallResultMessages(toolCallResults: MultimodalToolCallResult[]): ChatCompletionMessageParam[];
}
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