agent-framework/dotnet/samples/02-agents/AgentProviders/Agent_With_OpenAIResponses/Program.cs

// Copyright (c) Microsoft. All rights reserved.

// This sample shows how to create and use a simple AI agent with OpenAI Responses as the backend.

using Microsoft.Agents.AI;
using OpenAI;
using OpenAI.Responses;

var apiKey = Environment.GetEnvironmentVariable("OPENAI_API_KEY") ?? throw new InvalidOperationException("OPENAI_API_KEY is not set.");
var model = Environment.GetEnvironmentVariable("OPENAI_CHAT_MODEL_NAME") ?? "gpt-5.4-mini";

AIAgent agent = new OpenAIClient(
    apiKey)
     .GetResponsesClient()
     .AsAIAgent(model: model, instructions: "You are good at telling jokes.", name: "Joker");

// Invoke the agent and output the text result.
Console.WriteLine(await agent.RunAsync("Tell me a joke about a pirate."));