route.ts

// Dedicated runtime for the Declarative Generative UI (A2UI — Dynamic Schema) cell.

import type { NextRequest } from "next/server";
import { NextResponse } from "next/server";
import {
  CopilotRuntime,
  ExperimentalEmptyAdapter,
  copilotRuntimeNextJSAppRouterEndpoint,
} from "@copilotkit/runtime";
import { LangGraphAgent } from "@copilotkit/runtime/langgraph";

const LANGGRAPH_URL =
  process.env.LANGGRAPH_DEPLOYMENT_URL || "http://localhost:8123";

const declarativeGenUiAgent = new LangGraphAgent({
  deploymentUrl: LANGGRAPH_URL,
  graphId: "a2ui_dynamic",
  langsmithApiKey: process.env.LANGSMITH_API_KEY || "",
});

const runtime = new CopilotRuntime({
  // @ts-ignore -- see main route.ts
  agents: { "declarative-gen-ui": declarativeGenUiAgent },
  a2ui: {
    injectA2UITool: true,
  },
});

export const POST = async (req: NextRequest) => {
  try {
    const { handleRequest } = copilotRuntimeNextJSAppRouterEndpoint({
      endpoint: "/api/copilotkit-declarative-gen-ui",
      serviceAdapter: new ExperimentalEmptyAdapter(),
      runtime,
    });
    return await handleRequest(req);
  } catch (error: unknown) {
    const e = error as { message?: string; stack?: string };
    return NextResponse.json(
      { error: e.message, stack: e.stack },
      { status: 500 },
    );
  }
};