/**
 * a2a/client.ts — AIBroker as an A2A client: task an OUTSIDE agent's
 * exposed skill and poll for its answer.
 *
 * Fetch-only, no dependencies, works against any A2A v0.3.0 server —
 * that is the point of `aibroker a2a check` in a2a-cli.ts, which runs
 * this client against an arbitrary remote agent and reports pass/fail per
 * step rather than assuming aibroker's own server is the only target.
 */
import type { AgentCard, Task } from "./schema/types.js";
export interface FetchAgentCardResult {
    ok: boolean;
    card?: AgentCard;
    errors: string[];
}
/** GET <base>/.well-known/agent-card.json, validated against the vendored schema. */
export declare function fetchAgentCard(baseUrl: string): Promise<FetchAgentCardResult>;
export interface SendMessageResult {
    ok: boolean;
    task?: Task;
    error?: string;
}
export interface SendMessageOptions {
    /** Which exposed skill/session to target. Optional because a generic A2A
     *  agent — the target of `aibroker a2a check` — need not have this concept
     *  at all; aibroker's own server requires it (or message.metadata.session). */
    skillId?: string;
    text: string;
    /** Tag the text part as an AG2 (Agentish v2) message per the extension. */
    ag2?: boolean;
    token?: string;
    contextId?: string;
    agentName?: string;
}
export declare function sendMessage(a2aUrl: string, opts: SendMessageOptions): Promise<SendMessageResult>;
export declare function getTask(a2aUrl: string, taskId: string, token?: string): Promise<SendMessageResult>;
export declare function cancelTask(a2aUrl: string, taskId: string, token?: string): Promise<SendMessageResult>;
export interface PollOptions {
    intervalMs?: number;
    timeoutMs?: number;
    token?: string;
}
/** Poll tasks/get until the task reaches a terminal state or the timeout elapses. */
export declare function pollUntilDone(a2aUrl: string, taskId: string, opts?: PollOptions): Promise<SendMessageResult>;
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