test

dotnet/samples/GettingStarted/Agents/Agent_Step16_ChatReduction/Agent_Step16_ChatReduction.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>net10.0</TargetFrameworks>
+
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Azure.AI.OpenAI" />
+    <PackageReference Include="Azure.Identity" />
+    <PackageReference Include="Microsoft.Extensions.AI.OpenAI" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\src\Microsoft.Agents.AI.OpenAI\Microsoft.Agents.AI.OpenAI.csproj" />
+  </ItemGroup>
+
+</Project>

dotnet/samples/GettingStarted/Agents/Agent_Step16_ChatReduction/Program.cs

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+// Copyright (c) Microsoft. All rights reserved.
+
+// This sample shows how to use a chat history reducer to keep the context within model size limits.
+// Any implementation of Microsoft.Extensions.AI.IChatReducer can be used to customize how the chat history is reduced.
+// NOTE: this feature is only supported where the chat history is stored locally, such as with OpenAI Chat Completion.
+// Where the chat history is stored server side, such as with Azure Foundry Agents, the service must manage the chat history size.
+
+using Azure.AI.OpenAI;
+using Azure.Identity;
+using Microsoft.Agents.AI;
+using Microsoft.Extensions.AI;
+using OpenAI.Chat;
+using ChatMessage = Microsoft.Extensions.AI.ChatMessage;
+
+var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
+var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";
+
+// Construct the agent, and provide a factory to create an in-memory chat message store with a reducer that keeps only the last 2 non-system messages.
+AIAgent agent = new AzureOpenAIClient(
+    new Uri(endpoint),
+    new AzureCliCredential())
+    .GetChatClient(deploymentName)
+    .AsAIAgent(new ChatClientAgentOptions
+    {
+        ChatOptions = new() { Instructions = "You are good at telling jokes." },
+        Name = "Joker",
+        ChatMessageStoreFactory = (ctx, ct) => new ValueTask<ChatMessageStore>(new InMemoryChatMessageStore(new MessageCountingChatReducer(2), ctx.SerializedState, ctx.JsonSerializerOptions))
+    });
+
+AgentThread thread = await agent.GetNewThreadAsync();
+
+// Invoke the agent and output the text result.
+Console.WriteLine(await agent.RunAsync("Tell me a joke about a pirate.", thread));
+
+// Get the chat history to see how many messages are stored.
+IList<ChatMessage>? chatHistory = thread.GetService<IList<ChatMessage>>();
+Console.WriteLine($"\nChat history has {chatHistory?.Count} messages.\n");
+
+// Invoke the agent a few more times.
+Console.WriteLine(await agent.RunAsync("Tell me a joke about a robot.", thread));
+Console.WriteLine($"\nChat history has {chatHistory?.Count} messages.\n");
+Console.WriteLine(await agent.RunAsync("Tell me a joke about a lemur.", thread));
+Console.WriteLine($"\nChat history has {chatHistory?.Count} messages.\n");
+
+// At this point, the chat history has exceeded the limit and the original message will not exist anymore,
+// so asking a follow up question about it will not work as expected.
+Console.WriteLine(await agent.RunAsync("Tell me the joke about the pirate again, but add emojis and use the voice of a parrot.", thread));
+
+Console.WriteLine($"\nChat history has {chatHistory?.Count} messages.\n");