import { Tool, ToolCallEngine, StreamProcessingState, StreamChunkResult, ParsedModelResponse, MultimodalToolCallResult, ChatCompletionMessageParam, ChatCompletionChunk, AgentSingleLoopReponse } from '@multimodal/agent-interface';
/**
 * Abstract base class for tool call engines that provides common functionality
 * and enforces consistent behavior across different engine implementations.
 */
export declare abstract class BaseToolCallEngine implements ToolCallEngine {
    protected readonly useNativeToolCalls: boolean;
    constructor(useNativeToolCalls?: boolean);
    /**
     * Abstract method to prepare the system prompt with tool information
     */
    abstract preparePrompt(instructions: string, tools: Tool[]): string;
    /**
     * Abstract method to prepare the request parameters
     */
    abstract prepareRequest(context: any): any;
    /**
     * Initialize stream processing state with common defaults
     */
    initStreamProcessingState(): StreamProcessingState;
    /**
     * Abstract method to process streaming chunks
     */
    abstract processStreamingChunk(chunk: ChatCompletionChunk, state: StreamProcessingState): StreamChunkResult;
    /**
     * Finalize stream processing with common logic
     */
    finalizeStreamProcessing(state: StreamProcessingState): ParsedModelResponse;
    /**
     * Build historical assistant message with common logic
     */
    buildHistoricalAssistantMessage(response: AgentSingleLoopReponse): ChatCompletionMessageParam;
    /**
     * Build historical tool call result messages using shared utility
     */
    buildHistoricalToolCallResultMessages(toolCallResults: MultimodalToolCallResult[]): ChatCompletionMessageParam[];
    /**
     * Common helper to process reasoning content in chunks
     */
    protected processReasoningContent(chunk: ChatCompletionChunk, state: StreamProcessingState): string;
    /**
     * Common helper to process finish reason in chunks
     */
    protected processFinishReason(chunk: ChatCompletionChunk, state: StreamProcessingState): void;
}
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