plus your Mastra SDK:

pnpm add @ag-ui/mastra
# plus your Mastra SDK:
pnpm add @mastra/core

import {
  CopilotRuntime,
  createCopilotRuntimeHandler,
} from "@copilotkit/runtime/v2";
import { MastraAgent } from "@ag-ui/mastra";
import { Mastra } from "@mastra/core";
import { weatherAgent } from "./agents/weather"; // your Mastra agent

const mastra = new Mastra({
  agents: { weather: weatherAgent },
});

const runtime = new CopilotRuntime({
  agents: MastraAgent.getLocalAgents({
    mastra,
    // Required ONLY when your Mastra agent has Memory enabled AND a threadId
    // is supplied (the runtime always supplies a threadId, so Memory-enabled
    // agents effectively always need this). Passing an empty string throws
    // AGENT_MEMORY_MISSING_RESOURCE_ID on every turn. Agents without Memory
    // can omit resourceId — e.g. the in-tree `examples/integrations/mastra`
    // quickstart calls `MastraAgent.getLocalAgents({ mastra })` with no
    // resourceId. Pick a stable per-user identifier in production; a literal
    // "default" is fine as a placeholder for single-tenant demos.
    resourceId: "default",
  }),
});

const handler = createCopilotRuntimeHandler({
  runtime,
  basePath: "/api/copilotkit",
});

export default { fetch: handler };

import { HttpAgent } from "@ag-ui/client";

const runtime = new CopilotRuntime({
  agents: {
    weather: new HttpAgent({ url: `${process.env.MASTRA_URL!}/weather` }),
  },
});