route.ts

// Dedicated runtime for the declarative-hashbrown demo.
//
// The demo page (`src/app/demos/declarative-hashbrown/page.tsx`) wraps
// CopilotChat in the HashBrownDashboard provider and overrides the
// assistant message slot with a renderer that consumes hashbrown-shaped
// structured output via `@hashbrownai/react`'s `useUiKit` + `useJsonParser`.
// The MS Agent behind this endpoint (see `src/agents/byoc_hashbrown_agent.py`,
// mounted at `/byoc-hashbrown` in `agent_server.py`) has a system prompt
// tuned to emit that shape. The legacy `byoc_hashbrown` Python module name
// is retained (mirrors LangGraph's convention — see
// `langgraph-python/src/app/api/copilotkit-declarative-hashbrown/route.ts`);
// only the user-facing slug, route, and frontend folder use the
// `declarative-` prefix so the manifest is one-to-one with LGP.

import type { NextRequest } from "next/server";
import { NextResponse } from "next/server";
import {
  CopilotRuntime,
  ExperimentalEmptyAdapter,
  copilotRuntimeNextJSAppRouterEndpoint,
} from "@copilotkit/runtime";
import { HttpAgent } from "@ag-ui/client";

const AGENT_URL = process.env.AGENT_URL || "http://localhost:8000";

const declarativeHashbrownAgent = new HttpAgent({
  url: `${AGENT_URL}/byoc-hashbrown`,
});

const runtime = new CopilotRuntime({
  // @ts-ignore -- Published CopilotRuntime agents type wraps Record in
  // MaybePromise<NonEmptyRecord<...>> which rejects plain Records; fixed in
  // source, pending release.
  agents: { "declarative-hashbrown-demo": declarativeHashbrownAgent },
});

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 },
    );
  }
};