import type { Message, ContentPart, ToolCall } from './types';
/**
 * Manages message history for LLM conversations
 */
export declare class MessageManager {
    private messages;
    /**
     * Create a new MessageManager
     * @param initialMessages - Optional initial messages to populate history
     */
    constructor(initialMessages?: Message[]);
    /**
     * Add a system message to the history
     * @param content - The system prompt content
     */
    addSystem(content: string): void;
    /**
     * Add a user message to the history
     * @param content - The user message content (string or ContentPart array for multimodal)
     */
    addUser(content: string | ContentPart[]): void;
    /**
     * Add an assistant message to the history
     * @param content - The assistant response content
     * @param toolCalls - Optional tool calls made by the assistant
     */
    addAssistant(content: string, toolCalls?: ToolCall[]): void;
    /**
     * Add a tool result message to the history
     * @param toolCallId - The ID of the tool call this result responds to
     * @param result - The result of the tool execution (will be stringified if not a string)
     */
    addToolResult(toolCallId: string, result: string): void;
    /**
     * Get all messages in the history
     * @returns A copy of the message array
     */
    getMessages(): Message[];
    /**
     * Clear all messages from the history
     */
    clear(): void;
    /**
     * Get the number of messages in the history
     */
    get length(): number;
    /**
     * Serialize the message history to JSON
     * @returns The message array
     */
    toJSON(): Message[];
    /**
     * Create a MessageManager from serialized JSON
     * @param messages - The serialized message array
     * @returns A new MessageManager instance
     */
    static fromJSON(messages: Message[]): MessageManager;
}
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