agent/agent-framework
2
0
Fork 0
mirror of https://github.com/microsoft/agent-framework.git synced 2026-06-16 21:04:09 +08:00
Code Issues Packages Projects Releases Wiki Activity

.NET: Add sample to show ChatReducer usage (#1221)

Browse Source 
* Add sample to show ChatReducer usage

* Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
westey
2025-10-07 08:17:31 +00:00
committed by GitHub
co-authored by Copilot
parent 49f25358d7
commit 7506046f43
4 changed files with 74 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
dotnet/samples/GettingStarted/Agents/Agent_Step16_ChatReduction/Program.cs
+51
View File
@@ -0,0 +1,51 @@
// 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;
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";
const string JokerName = "Joker";
const string JokerInstructions = "You are good at telling jokes.";
// 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)
.CreateAIAgent(new ChatClientAgentOptions
{
Name = JokerName,
Instructions = JokerInstructions,
ChatMessageStoreFactory = ctx => new InMemoryChatMessageStore(new MessageCountingChatReducer(2), ctx.SerializedState, ctx.JsonSerializerOptions)
});
AgentThread thread = agent.GetNewThread();
// 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");