import type { ContentBlock, ImageContent, ToolResultContentBlock, UserContentBlock } from './content-block.js';
/** Base fields shared by persisted agent messages. */
export interface AgentMessageBase {
    timestamp: number;
}
export interface UserMessage extends AgentMessageBase {
    role: 'user';
    content: UserContentBlock[];
}
export interface AssistantMessage extends AgentMessageBase {
    role: 'assistant';
    content: ContentBlock[];
    api: string;
    provider: string;
    model: string;
    usage: TokenUsage;
    stopReason: AssistantStopReason;
    errorMessage?: string;
}
export interface ToolResultMessage extends AgentMessageBase {
    role: 'toolResult';
    toolCallId: string;
    toolName: string;
    content: ToolResultContentBlock[];
    isError: boolean;
}
/** IM / product extensions via declaration merging in @zhin.js/agent. */
export interface CustomAgentMessage extends AgentMessageBase {
    role: string;
    [key: string]: unknown;
}
export type AgentMessage = UserMessage | AssistantMessage | ToolResultMessage | CustomAgentMessage;
export type AssistantStopReason = 'stop' | 'length' | 'toolCalls' | 'error' | 'aborted';
export interface TokenCost {
    input: number;
    output: number;
    cacheRead: number;
    cacheWrite: number;
    total: number;
}
export interface TokenUsage {
    input: number;
    output: number;
    cacheRead: number;
    cacheWrite: number;
    totalTokens: number;
    cost: TokenCost;
}
export declare const EMPTY_TOKEN_USAGE: TokenUsage;
export declare function isLlmAgentMessage(message: AgentMessage): message is UserMessage | AssistantMessage | ToolResultMessage;
export declare function createUserMessage(text: string, images?: ImageContent[], timestamp?: number): UserMessage;
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