import { AgentEventStream, ToolCallEngine, Tool, ChatCompletionMessageParam } from '@multimodal/agent-interface';
/**
 * MessageHistory - Converts event stream to message history
 * This separates the concerns of event storage from message history formatting
 *
 * Features:
 * - Handles multimodal content including text and images
 * - Limits images to prevent context window overflow
 * - Maintains conversation structure for LLM context
 * - Supports environment inputs as part of the conversation
 */
export declare class MessageHistory {
    private eventStream;
    private maxImagesCount?;
    private logger;
    /**
     * Creates a new MessageHistory instance
     *
     * @param eventStream - The event stream to convert to message history
     * @param maxImagesCount - Optional maximum number of images to include in the context.
     *                         When specified, limits the total number of images in the conversation history
     *                         to prevent context window overflow. Images beyond this limit will be
     *                         replaced with text placeholders to preserve context while reducing token usage.
     */
    constructor(eventStream: AgentEventStream.Processor, maxImagesCount?: number | undefined);
    /**
     * Convert events to message history format for LLM context
     * This method uses the provided toolCallEngine to format messages
     * according to the specific requirements of the underlying LLM
     *
     * @param toolCallEngine The tool call engine to use for message formatting
     * @param systemPrompt The base system prompt to include
     * @param tools Available tools to enhance the system prompt
     */
    toMessageHistory(toolCallEngine: ToolCallEngine, customSystemPrompt: string, tools?: Tool[]): ChatCompletionMessageParam[];
    /**
     * Process all events in a single unified path with optional image limiting
     */
    private processEvents;
    /**
     * Process plan update event
     * Adds plan information as a system message to guide the agent
     */
    private processPlanUpdate;
    /**
     * Process all images in all events
     */
    private countAllImagesInEvents;
    /**
     * Get a set of image references that should be omitted based on the sliding window
     */
    private getImagesToOmit;
    /**
     * Collect all image references from events, ordered from newest to oldest
     */
    private collectAllImageReferences;
    /**
     * Process a user message
     */
    private processUserMessage;
    /**
     * Process content, replacing omitted images with placeholder text
     */
    private processContent;
    /**
     * Process an assistant message and its tool calls
     */
    private processAssistantMessage;
    /**
     * Process tool calls and their results
     */
    private processToolCalls;
    /**
     * Helper method to find all tool results associated with an assistant message's tool calls
     */
    private findToolResultsForAssistantMessage;
    /**
     * Count the number of images in multimodal content
     */
    private countImagesInContent;
    /**
     * Generate the system prompt with current time
     */
    getSystemPromptWithTime(instructions: string): string;
    /**
     * Process environment input event
     * Adds environment context as a user-like message but with a specific role
     */
    private processEnvironmentInput;
}
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