import type { AgentChatEvent } from "../agent/types.js";
import type { DataPart } from "./types.js";
export declare const A2A_AGENT_ACTIVITY_KIND = "agent-native/agent-activity";
export declare const A2A_AGENT_ACTIVITY_VERSION = 1;
export declare const MAX_A2A_ACTIVITY_REASONING_CHARS = 32768;
export declare const MAX_A2A_ACTIVITY_RESPONSE_CHARS = 32768;
export declare const MAX_A2A_ACTIVITY_REASONING_SEGMENTS = 128;
export declare const MAX_A2A_ACTIVITY_TOOL_CALLS = 64;
export declare const MAX_A2A_ACTIVITY_TOOL_NAME_CHARS = 96;
export declare const MAX_A2A_ACTIVITY_TOOL_ID_CHARS = 128;
export declare const MAX_A2A_ACTIVITY_TOOL_INPUT_CHARS = 1024;
export declare const MAX_A2A_ACTIVITY_TOOL_RESULT_CHARS = 512;
export declare const MAX_A2A_ACTIVITY_TOOL_PAYLOAD_CHARS = 16384;
export declare const MAX_A2A_ACTIVITY_TOTAL_CHARS: number;
export type A2AAgentActivityPhase = "reasoning" | "tool" | "responding" | "complete" | "error";
export type A2AAgentActivityToolStatus = "running" | "completed" | "failed";
export interface A2AAgentActivityToolCall {
    name: string;
    id?: string;
    status: A2AAgentActivityToolStatus;
    input?: string;
    result?: string;
}
export interface A2AAgentActivitySnapshot extends Record<string, unknown> {
    kind: typeof A2A_AGENT_ACTIVITY_KIND;
    version: typeof A2A_AGENT_ACTIVITY_VERSION;
    sequence: number;
    startedAt: number;
    updatedAt: number;
    durationMs: number;
    activePhase: A2AAgentActivityPhase;
    reasoning: string[];
    toolCalls: A2AAgentActivityToolCall[];
    response?: string[];
    responseText?: string;
}
export interface A2AAgentActivityState {
    sequence: number;
    startedAt: number;
    updatedAt: number;
    activePhase: A2AAgentActivityPhase;
    reasoning: string[];
    toolCalls: A2AAgentActivityToolCall[];
    response: string[];
}
export declare function createA2AAgentActivityState(startedAt?: number): A2AAgentActivityState;
export declare function applyA2AAgentActivityEvent(state: A2AAgentActivityState, event: AgentChatEvent, updatedAt?: number): A2AAgentActivityState;
export declare function buildA2AAgentActivitySnapshot(state: A2AAgentActivityState): A2AAgentActivitySnapshot;
export declare function buildA2AAgentActivityPart(state: A2AAgentActivityState): DataPart;
export declare function parseA2AAgentActivityPart(part: unknown): A2AAgentActivitySnapshot | null;