.NET: document Azure Functions trigger discovery

dotnet/samples/01-get-started/06_host_your_agent/DurableTriggerDiscovery.cs

@@ -0,0 +1,17 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+using Microsoft.Azure.Functions.Worker;
+using Microsoft.DurableTask;
+
+namespace HostedAgent;
+
+public static class DurableTriggerDiscovery
+{
+    [Function(nameof(DurableTriggerDiscovery))]
+    public static Task RunAsync([OrchestrationTrigger] TaskOrchestrationContext context)
+    {
+        // The isolated worker SDK indexes Durable triggers from the app assembly.
+        // Hosting-only apps still need one local orchestrator for discovery.
+        return Task.CompletedTask;
+    }
+}

dotnet/samples/04-hosting/DurableAgents/AzureFunctions/README.md

@@ -141,6 +141,8 @@ func start
 
 The Azure Functions app will be available at `http://localhost:7071`.
 
+If the hosted agent routes are not listed when the app starts, make sure the app defines at least one local `[OrchestrationTrigger]` function. In .NET isolated worker apps, the Durable extension is indexed from triggers discovered in the app assembly.
+
 ### Test the Azure Functions app
 
 The README.md file in each sample directory contains instructions for testing the sample. Each sample also includes a `demo.http` file that can be used to test the sample from the command line. These files can be opened in VS Code with the [REST Client](https://marketplace.visualstudio.com/items?itemName=humao.rest-client) extension or in the Visual Studio IDE.

dotnet/src/Microsoft.Agents.AI.Hosting.AzureFunctions/README.md

@@ -61,6 +61,18 @@ app.Run();
 
 By default, each agent can be invoked via a built-in HTTP trigger function at the route `http[s]://[host]/api/agents/{agentName}/run`.
 
+> [!NOTE]
+> In .NET isolated Azure Functions apps, the worker SDK discovers Durable Functions triggers from the app assembly. If your app only hosts agents through `ConfigureDurableAgents(...)` and does not define any Durable orchestrator functions, add a small `[OrchestrationTrigger]` function in your app assembly so the Durable extension is indexed.
+
+```csharp
+public static class DurableTriggerDiscovery
+{
+    [Function(nameof(DurableTriggerDiscovery))]
+    public static Task RunAsync([OrchestrationTrigger] TaskOrchestrationContext context)
+        => Task.CompletedTask;
+}
+```
+
 ### Orchestrating hosted agents
 
 This package also provides a set of extension methods such as `GetAgent` on the [`TaskOrchestrationContext`](https://learn.microsoft.com/dotnet/api/microsoft.durabletask.taskorchestrationcontext) class for interacting with hosted agents within orchestrations.