/**
 * Agent State Utilities
 *
 * Helper functions for serializing and restoring agent state.
 */
import type { Message } from '../providers/types.js';
import type { TodoItem } from '../tools/builtin/todo.js';
import type { AgentState } from './types.js';
/**
 * Generate a new session ID
 */
export declare function generateSessionId(): string;
/**
 * Create an empty agent state
 */
export declare function createEmptyState(sessionId: string, systemPrompt: string): AgentState;
/**
 * Create agent state from current agent state
 */
export declare function createAgentState(options: {
    sessionId: string;
    systemPrompt: string;
    model?: string;
    messages: Message[];
    todos: TodoItem[];
    currentIteration: number;
    turnCount: number;
    totalTokensUsed: number;
    createdAt?: string;
}): AgentState;
/**
 * Serialize todos (convert Date to ISO string)
 */
export declare function serializeTodos(todos: TodoItem[]): TodoItem[];
/**
 * Deserialize todos (convert ISO string back to Date)
 */
export declare function deserializeTodos(todos: TodoItem[]): TodoItem[];
/**
 * Update state's updatedAt timestamp
 */
export declare function touchState(state: AgentState): AgentState;