route.ts

// Dedicated runtime for the declarative-hashbrown demo.
//
// The demo page (`src/app/demos/declarative-hashbrown/page.tsx`) wraps the
// `<Chat />` component (`./chat.tsx`) in the HashBrownDashboard provider;
// `Chat` overrides the CopilotChat assistantMessage slot with a renderer
// that consumes hashbrown-shaped structured output via `@hashbrownai/react`'s
// `useUiKit` + `useJsonParser`. The Python module + langgraph graph ID
// retain the legacy `byoc_hashbrown` name (only the user-facing slug,
// route, and frontend folder were renamed); the system prompt that
// produces the hashbrown shape lives in
// `src/agents/byoc_hashbrown_prompt.py`.

import { NextRequest, 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 byocHashbrownAgent = new LangGraphAgent({
  deploymentUrl: LANGGRAPH_URL,
  graphId: "byoc_hashbrown",
  langsmithApiKey: process.env.LANGSMITH_API_KEY || "",
});

const runtime = new CopilotRuntime({
  // @ts-ignore -- see main route.ts
  agents: { "declarative-hashbrown-demo": byocHashbrownAgent },
});

export const POST = async (req: NextRequest) => {
  try {
    const { handleRequest } = copilotRuntimeNextJSAppRouterEndpoint({
      endpoint: "/api/copilotkit-declarative-hashbrown",
      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 },
    );
  }
};