chore: import upstream snapshot with attribution

2026-07-13 13:39:25 +08:00
commit db620d33df
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+// Copyright (c) Microsoft. All rights reserved.
+
+// Translation Chain Workflow Agent — demonstrates how to compose multiple AI agents
+// into a sequential workflow pipeline. Three translation agents are connected:
+// English → French → Spanish → English, showing how agents can be orchestrated
+// as workflow executors in a hosted agent.
+
+using Azure.AI.Projects;
+using Azure.Core;
+using Azure.Identity;
+using DotNetEnv;
+using Hosted_Shared_Contributor_Setup;
+using Microsoft.Agents.AI;
+using Microsoft.Agents.AI.Foundry.Hosting;
+using Microsoft.Agents.AI.Workflows;
+using Microsoft.Extensions.AI;
+
+// Load .env file if present (for local development)
+Env.TraversePath().Load();
+
+string endpoint = Environment.GetEnvironmentVariable("FOUNDRY_PROJECT_ENDPOINT")
+    ?? throw new InvalidOperationException("FOUNDRY_PROJECT_ENDPOINT is not set.");
+string deploymentName = Environment.GetEnvironmentVariable("FOUNDRY_MODEL") ?? "gpt-4o";
+
+// WARNING: DefaultAzureCredential is convenient for development but requires careful consideration in production.
+// In production, consider using a specific credential (e.g., ManagedIdentityCredential) to avoid
+// latency issues, unintended credential probing, and potential security risks from fallback mechanisms.
+// Use a chained credential: try a temporary dev token first (for local Docker debugging),
+// then fall back to DefaultAzureCredential (for local dev via dotnet run / managed identity in production).
+TokenCredential credential = new ChainedTokenCredential(
+    new DevTemporaryTokenCredential(),
+    new DefaultAzureCredential());
+
+// Create a chat client from the Foundry project
+IChatClient chatClient = new AIProjectClient(new Uri(endpoint), credential)
+    .GetProjectOpenAIClient()
+    .GetChatClient(deploymentName)
+    .AsIChatClient();
+
+// Create translation agents
+AIAgent frenchAgent = chatClient.AsAIAgent("You are a translation assistant that translates the provided text to French.");
+AIAgent spanishAgent = chatClient.AsAIAgent("You are a translation assistant that translates the provided text to Spanish.");
+AIAgent englishAgent = chatClient.AsAIAgent("You are a translation assistant that translates the provided text to English.");
+
+// Build the sequential workflow: French → Spanish → English
+AIAgent agent = new WorkflowBuilder(frenchAgent)
+    .AddEdge(frenchAgent, spanishAgent)
+    .AddEdge(spanishAgent, englishAgent)
+    .Build()
+    .AsAIAgent(
+        name: Environment.GetEnvironmentVariable("AGENT_NAME") ?? "hosted-workflows");
+
+// Host the workflow agent as a Foundry Hosted Agent using the Responses API.
+var builder = WebApplication.CreateBuilder(args);
+builder.Services.AddFoundryResponses(agent);
+
+var app = builder.Build();
+app.MapFoundryResponses();
+
+// Contributor-only: in Development, also map the per-agent OpenAI route shape that live Foundry uses
+// so a local REPL client can target this server via AIProjectClient.AsAIAgent(Uri agentEndpoint).
+// Do not use this in production. Hosted Foundry agents only support the agent-endpoint path.
+app.MapDevTemporaryLocalAgentEndpoint();
+
+app.Run();