import { Tool, ToolCallEngine, StreamProcessingState, StreamChunkResult, ChatCompletionMessageToolCall } from '@multimodal/agent-interface';
/**
 * Base configuration for tool call engines
 */
export interface ToolCallEngineConfig {
    /** Maximum size of content buffer in characters */
    maxBufferSize?: number;
    /** Maximum number of tool calls to track */
    maxToolCalls?: number;
}
/**
 * Base class for all Tool Call Engines providing common functionality
 * and performance optimizations
 */
export declare abstract class ToolCallEngineBase extends ToolCallEngine {
    protected logger: import("@agent-infra/logger/dist/console-logger").ConsoleLogger;
    protected config: Required<ToolCallEngineConfig>;
    private toolDescriptionCache;
    constructor(config?: ToolCallEngineConfig);
    /**
     * Generate a hash for tools array to enable caching
     */
    private generateToolsHash;
    /**
     * Get cached or generate tool description
     */
    protected getCachedToolDescription(tools: Tool[]): string;
    /**
     * Generate tool description - to be implemented by subclasses
     */
    protected abstract generateToolDescription(tools: Tool[]): string;
    /**
     * Format tool parameters with caching for better performance
     */
    protected formatToolParameters(tool: Tool): string;
    /**
     * Safely truncate buffer if it exceeds maximum size
     */
    protected truncateBuffer(buffer: string): string;
    /**
     * Validate and limit tool calls array
     */
    protected validateToolCalls(toolCalls: ChatCompletionMessageToolCall[]): ChatCompletionMessageToolCall[];
    /**
     * Create a safe processing state with memory limits
     */
    protected createSafeProcessingState(): StreamProcessingState;
    /**
     * Update processing state with safety checks
     */
    protected updateProcessingState(state: StreamProcessingState, contentDelta: string, reasoningDelta?: string): void;
    /**
     * Handle common error scenarios in streaming
     */
    protected handleStreamingError(error: unknown, context: string): StreamChunkResult;
    /**
     * Clear cache - useful for testing or when tools change frequently
     */
    clearCache(): void;
}
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