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The agent definition file. Must export a default ToolLoopAgent and optionally an accepts for payment gating. 
import { openai } from "@ai-sdk/openai";
import { stepCountIs, ToolLoopAgent } from "ai";
import type { Accepts } from "aixyz/accepts";
import weather from "./tools/weather";

export const accepts: Accepts = {
  scheme: "exact",
  price: "$0.005",
};

export default new ToolLoopAgent({
  model: openai("gpt-4o-mini"),
  instructions: "You are a helpful weather assistant.",
  tools: { weather },
  stopWhen: stepCountIs(10),
});

​
Exports

ExportTypeRequiredDescription
defaultToolLoopAgentYesThe agent instance
acceptsAcceptsNoPayment config — gates the A2A /agent route
When accepts is exported, the /agent endpoint requires x402 payment. Without it, the agent is not registered on the A2A endpoint.