Channels Agent Setup

Follow the LangGraph FastAPI quickstart to configure the sample_agent graph and AG-UI endpoint, then start the same FastAPI application:

uv run main.py

Point the LangGraph HTTP adapter at the AG-UI endpoint:

AGENT_URL=http://localhost:8123/

The Runtime package installed by the Channels quickstart includes the native LangGraph adapter.

This selector variant follows the quickstart's FastAPI deployment, so use LangGraphHttpAgent. Return a fresh adapter for every channel thread:

import { LangGraphHttpAgent } from "@copilotkit/runtime/langgraph";

export function makeAgent(threadId: string) {
  const agent = new LangGraphHttpAgent({
    url: process.env.AGENT_URL!,
  });
  agent.threadId = threadId;
  return agent;
}