mirror of
https://github.com/microsoft/agent-framework.git
synced 2026-06-16 21:04:09 +08:00
Jacob Alber
5530bc536b
* feat: Implement return-to-previous routing in handoff workflow - Also obsoletes HandoffsWorkflowBuilder => HandoffWorkflowBuilder (no "s") * refactor: Remove instance-shared current agent tracking in handoffs Because the tracker was instance-shared between the start and end executors, it would be shared between all sessions, resulting in incorrect behaviour. The corect way to do this is to keep the data in a shared executor scope, which is per-session. * fix: Fix test logic for Handoff to correctly use checkpointing for multiturn
926 lines
43 KiB
C#
926 lines
43 KiB
C#
// Copyright (c) Microsoft. All rights reserved.
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.CompilerServices;
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using System.Text;
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using System.Text.Json;
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using System.Text.RegularExpressions;
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using System.Threading;
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using System.Threading.Tasks;
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using Microsoft.Agents.AI.Workflows.InProc;
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using Microsoft.Extensions.AI;
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#pragma warning disable SYSLIB1045 // Use GeneratedRegex
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#pragma warning disable RCS1186 // Use Regex instance instead of static method
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namespace Microsoft.Agents.AI.Workflows.UnitTests;
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public class AgentWorkflowBuilderTests
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{
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[Fact]
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public void BuildSequential_InvalidArguments_Throws()
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{
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Assert.Throws<ArgumentNullException>("agents", () => AgentWorkflowBuilder.BuildSequential(workflowName: null!, null!));
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Assert.Throws<ArgumentException>("agents", () => AgentWorkflowBuilder.BuildSequential());
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}
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[Fact]
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public void BuildConcurrent_InvalidArguments_Throws()
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{
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Assert.Throws<ArgumentNullException>("agents", () => AgentWorkflowBuilder.BuildConcurrent(null!));
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}
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[Fact]
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public void BuildHandoffs_InvalidArguments_Throws()
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{
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Assert.Throws<ArgumentNullException>("initialAgent", () => AgentWorkflowBuilder.CreateHandoffBuilderWith(null!));
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var agent = new DoubleEchoAgent("agent");
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var handoffs = AgentWorkflowBuilder.CreateHandoffBuilderWith(agent);
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Assert.NotNull(handoffs);
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Assert.Throws<ArgumentNullException>("from", () => handoffs.WithHandoff(null!, new DoubleEchoAgent("a2")));
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Assert.Throws<ArgumentNullException>("to", () => handoffs.WithHandoff(new DoubleEchoAgent("a2"), null!));
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Assert.Throws<ArgumentNullException>("from", () => handoffs.WithHandoffs(null!, new DoubleEchoAgent("a2")));
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Assert.Throws<ArgumentNullException>("from", () => handoffs.WithHandoffs([null!], new DoubleEchoAgent("a2")));
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Assert.Throws<ArgumentNullException>("to", () => handoffs.WithHandoffs(new DoubleEchoAgent("a2"), null!));
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Assert.Throws<ArgumentNullException>("to", () => handoffs.WithHandoffs(new DoubleEchoAgent("a2"), [null!]));
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var noDescriptionAgent = new ChatClientAgent(new MockChatClient(delegate { return new(); }));
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Assert.Throws<ArgumentException>("to", () => handoffs.WithHandoff(agent, noDescriptionAgent));
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}
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[Fact]
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public void BuildGroupChat_InvalidArguments_Throws()
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{
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Assert.Throws<ArgumentNullException>("managerFactory", () => AgentWorkflowBuilder.CreateGroupChatBuilderWith(null!));
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var groupChat = AgentWorkflowBuilder.CreateGroupChatBuilderWith(_ => new RoundRobinGroupChatManager([new DoubleEchoAgent("a1")]));
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Assert.NotNull(groupChat);
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Assert.Throws<ArgumentNullException>("agents", () => groupChat.AddParticipants(null!));
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Assert.Throws<ArgumentNullException>("agents", () => groupChat.AddParticipants([null!]));
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Assert.Throws<ArgumentNullException>("agents", () => groupChat.AddParticipants(new DoubleEchoAgent("a1"), null!));
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Assert.Throws<ArgumentNullException>("agents", () => new RoundRobinGroupChatManager(null!));
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}
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[Fact]
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public void GroupChatManager_MaximumIterationCount_Invalid_Throws()
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{
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var manager = new RoundRobinGroupChatManager([new DoubleEchoAgent("a1")]);
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const int DefaultMaxIterations = 40;
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Assert.Equal(DefaultMaxIterations, manager.MaximumIterationCount);
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Assert.Throws<ArgumentOutOfRangeException>("value", void () => manager.MaximumIterationCount = 0);
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Assert.Throws<ArgumentOutOfRangeException>("value", void () => manager.MaximumIterationCount = -1);
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Assert.Equal(DefaultMaxIterations, manager.MaximumIterationCount);
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manager.MaximumIterationCount = 30;
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Assert.Equal(30, manager.MaximumIterationCount);
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manager.MaximumIterationCount = 1;
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Assert.Equal(1, manager.MaximumIterationCount);
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manager.MaximumIterationCount = int.MaxValue;
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Assert.Equal(int.MaxValue, manager.MaximumIterationCount);
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}
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[Fact]
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public void BuildGroupChat_WithNameAndDescription_SetsWorkflowNameAndDescription()
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{
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const string WorkflowName = "Test Group Chat";
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const string WorkflowDescription = "A test group chat workflow";
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var workflow = AgentWorkflowBuilder
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.CreateGroupChatBuilderWith(agents => new RoundRobinGroupChatManager(agents) { MaximumIterationCount = 2 })
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.AddParticipants(new DoubleEchoAgent("agent1"), new DoubleEchoAgent("agent2"))
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.WithName(WorkflowName)
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.WithDescription(WorkflowDescription)
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.Build();
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Assert.Equal(WorkflowName, workflow.Name);
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Assert.Equal(WorkflowDescription, workflow.Description);
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}
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[Fact]
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public void BuildGroupChat_WithNameOnly_SetsWorkflowName()
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{
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const string WorkflowName = "Named Group Chat";
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var workflow = AgentWorkflowBuilder
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.CreateGroupChatBuilderWith(agents => new RoundRobinGroupChatManager(agents) { MaximumIterationCount = 2 })
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.AddParticipants(new DoubleEchoAgent("agent1"))
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.WithName(WorkflowName)
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.Build();
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Assert.Equal(WorkflowName, workflow.Name);
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Assert.Null(workflow.Description);
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}
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[Fact]
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public void BuildGroupChat_WithoutNameOrDescription_DefaultsToNull()
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{
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var workflow = AgentWorkflowBuilder
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.CreateGroupChatBuilderWith(agents => new RoundRobinGroupChatManager(agents) { MaximumIterationCount = 2 })
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.AddParticipants(new DoubleEchoAgent("agent1"))
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.Build();
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Assert.Null(workflow.Name);
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Assert.Null(workflow.Description);
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}
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[Theory]
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[InlineData(1)]
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[InlineData(2)]
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[InlineData(3)]
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[InlineData(4)]
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[InlineData(5)]
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public async Task BuildSequential_AgentsRunInOrderAsync(int numAgents)
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{
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var workflow = AgentWorkflowBuilder.BuildSequential(
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from i in Enumerable.Range(1, numAgents)
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select new DoubleEchoAgent($"agent{i}"));
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for (int iter = 0; iter < 3; iter++)
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{
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const string UserInput = "abc";
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(string updateText, List<ChatMessage>? result, _) = await RunWorkflowAsync(workflow, [new ChatMessage(ChatRole.User, UserInput)]);
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Assert.NotNull(result);
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Assert.Equal(numAgents + 1, result.Count);
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Assert.Equal(ChatRole.User, result[0].Role);
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Assert.Null(result[0].AuthorName);
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Assert.Equal(UserInput, result[0].Text);
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string[] texts = new string[numAgents + 1];
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texts[0] = UserInput;
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string expectedTotal = string.Empty;
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for (int i = 1; i < numAgents + 1; i++)
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{
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string id = $"agent{((i - 1) % numAgents) + 1}";
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texts[i] = $"{id}{Double(string.Concat(texts.Take(i)))}";
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Assert.Equal(ChatRole.Assistant, result[i].Role);
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Assert.Equal(id, result[i].AuthorName);
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Assert.Equal(texts[i], result[i].Text);
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expectedTotal += texts[i];
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}
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Assert.Equal(expectedTotal, updateText);
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Assert.Equal(UserInput + expectedTotal, string.Concat(result));
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static string Double(string s) => s + s;
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}
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}
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private class DoubleEchoAgent(string name) : AIAgent
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{
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public override string Name => name;
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protected override ValueTask<AgentSession> CreateSessionCoreAsync(CancellationToken cancellationToken = default)
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=> new(new DoubleEchoAgentSession());
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protected override ValueTask<AgentSession> DeserializeSessionCoreAsync(JsonElement serializedState, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
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=> new(new DoubleEchoAgentSession());
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protected override ValueTask<JsonElement> SerializeSessionCoreAsync(AgentSession session, JsonSerializerOptions? jsonSerializerOptions = null, CancellationToken cancellationToken = default)
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=> default;
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protected override Task<AgentResponse> RunCoreAsync(
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IEnumerable<ChatMessage> messages, AgentSession? session = null, AgentRunOptions? options = null, CancellationToken cancellationToken = default) =>
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throw new NotImplementedException();
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protected override async IAsyncEnumerable<AgentResponseUpdate> RunCoreStreamingAsync(
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IEnumerable<ChatMessage> messages, AgentSession? session = null, AgentRunOptions? options = null, [EnumeratorCancellation] CancellationToken cancellationToken = default)
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{
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await Task.Yield();
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var contents = messages.SelectMany(m => m.Contents).ToList();
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string id = Guid.NewGuid().ToString("N");
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yield return new AgentResponseUpdate(ChatRole.Assistant, this.Name) { AuthorName = this.Name, MessageId = id };
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yield return new AgentResponseUpdate(ChatRole.Assistant, contents) { AuthorName = this.Name, MessageId = id };
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yield return new AgentResponseUpdate(ChatRole.Assistant, contents) { AuthorName = this.Name, MessageId = id };
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}
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}
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private sealed class DoubleEchoAgentSession() : AgentSession();
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[Fact]
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public async Task BuildConcurrent_AgentsRunInParallelAsync()
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{
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StrongBox<TaskCompletionSource<bool>> barrier = new();
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StrongBox<int> remaining = new();
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var workflow = AgentWorkflowBuilder.BuildConcurrent(
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[
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new DoubleEchoAgentWithBarrier("agent1", barrier, remaining),
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new DoubleEchoAgentWithBarrier("agent2", barrier, remaining),
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]);
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for (int iter = 0; iter < 3; iter++)
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{
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barrier.Value = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
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remaining.Value = 2;
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(string updateText, List<ChatMessage>? result, _) = await RunWorkflowAsync(workflow, [new ChatMessage(ChatRole.User, "abc")]);
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Assert.NotEmpty(updateText);
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Assert.NotNull(result);
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// TODO: https://github.com/microsoft/agent-framework/issues/784
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// These asserts are flaky until we guarantee message delivery order.
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Assert.Single(Regex.Matches(updateText, "agent1"));
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Assert.Single(Regex.Matches(updateText, "agent2"));
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Assert.Equal(4, Regex.Matches(updateText, "abc").Count);
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Assert.Equal(2, result.Count);
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}
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}
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[Fact]
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public async Task Handoffs_NoTransfers_ResponseServedByOriginalAgentAsync()
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{
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var initialAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
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{
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ChatMessage message = Assert.Single(messages);
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Assert.Equal("abc", Assert.IsType<TextContent>(Assert.Single(message.Contents)).Text);
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return new(new ChatMessage(ChatRole.Assistant, "Hello from agent1"));
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}));
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var workflow =
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AgentWorkflowBuilder.CreateHandoffBuilderWith(initialAgent)
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.WithHandoff(initialAgent, new ChatClientAgent(new MockChatClient(delegate
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{
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Assert.Fail("Should never be invoked.");
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return new();
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}), description: "nop"))
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.Build();
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(string updateText, List<ChatMessage>? result, _) = await RunWorkflowAsync(workflow, [new ChatMessage(ChatRole.User, "abc")]);
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Assert.Equal("Hello from agent1", updateText);
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Assert.NotNull(result);
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Assert.Equal(2, result.Count);
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Assert.Equal(ChatRole.User, result[0].Role);
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Assert.Equal("abc", result[0].Text);
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Assert.Equal(ChatRole.Assistant, result[1].Role);
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Assert.Equal("Hello from agent1", result[1].Text);
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}
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[Fact]
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public async Task Handoffs_OneTransfer_ResponseServedBySecondAgentAsync()
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{
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var initialAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
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{
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ChatMessage message = Assert.Single(messages);
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Assert.Equal("abc", Assert.IsType<TextContent>(Assert.Single(message.Contents)).Text);
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string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
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Assert.NotNull(transferFuncName);
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return new(new ChatMessage(ChatRole.Assistant, [new FunctionCallContent("call1", transferFuncName)]));
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}), name: "initialAgent");
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var nextAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
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new(new ChatMessage(ChatRole.Assistant, "Hello from agent2"))),
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name: "nextAgent",
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description: "The second agent");
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var workflow =
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AgentWorkflowBuilder.CreateHandoffBuilderWith(initialAgent)
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.WithHandoff(initialAgent, nextAgent)
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.Build();
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(string updateText, List<ChatMessage>? result, _) = await RunWorkflowAsync(workflow, [new ChatMessage(ChatRole.User, "abc")]);
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Assert.Equal("Hello from agent2", updateText);
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Assert.NotNull(result);
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Assert.Equal(4, result.Count);
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Assert.Equal(ChatRole.User, result[0].Role);
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Assert.Equal("abc", result[0].Text);
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Assert.Equal(ChatRole.Assistant, result[1].Role);
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Assert.Equal("", result[1].Text);
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Assert.Contains("initialAgent", result[1].AuthorName);
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Assert.Equal(ChatRole.Tool, result[2].Role);
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Assert.Contains("initialAgent", result[2].AuthorName);
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Assert.Equal(ChatRole.Assistant, result[3].Role);
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Assert.Equal("Hello from agent2", result[3].Text);
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Assert.Contains("nextAgent", result[3].AuthorName);
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}
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[Fact]
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public async Task Handoffs_OneTransfer_HandoffTargetDoesNotReceiveHandoffFunctionMessagesAsync()
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{
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// Regression test for https://github.com/microsoft/agent-framework/issues/3161
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// When a handoff occurs, the target agent should receive the original user message
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// but should NOT receive the handoff function call or tool result messages from the
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// source agent, as these confuse the target LLM into ignoring the user's question.
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List<ChatMessage>? capturedNextAgentMessages = null;
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var initialAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
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{
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string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
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Assert.NotNull(transferFuncName);
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return new(new ChatMessage(ChatRole.Assistant, [new FunctionCallContent("call1", transferFuncName)]));
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}), name: "initialAgent");
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var nextAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
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{
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capturedNextAgentMessages = messages.ToList();
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return new(new ChatMessage(ChatRole.Assistant, "The derivative of x^2 is 2x."));
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}),
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name: "nextAgent",
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description: "The second agent");
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var workflow =
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AgentWorkflowBuilder.CreateHandoffBuilderWith(initialAgent)
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.WithHandoff(initialAgent, nextAgent)
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.Build();
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_ = await RunWorkflowAsync(workflow, [new ChatMessage(ChatRole.User, "What is the derivative of x^2?")]);
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Assert.NotNull(capturedNextAgentMessages);
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// The target agent should see the original user message
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Assert.Contains(capturedNextAgentMessages, m => m.Role == ChatRole.User && m.Text == "What is the derivative of x^2?");
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// The target agent should NOT see the handoff function call or tool result from the source agent
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Assert.DoesNotContain(capturedNextAgentMessages, m => m.Contents.Any(c => c is FunctionCallContent fcc && fcc.Name.StartsWith("handoff_to_", StringComparison.Ordinal)));
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Assert.DoesNotContain(capturedNextAgentMessages, m => m.Role == ChatRole.Tool && m.Contents.Any(c => c is FunctionResultContent frc && frc.Result?.ToString() == "Transferred."));
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}
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[Fact]
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public async Task Handoffs_TwoTransfers_HandoffTargetsDoNotReceiveHandoffFunctionMessagesAsync()
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{
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// Regression test for https://github.com/microsoft/agent-framework/issues/3161
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// With two hops (initial -> second -> third), each target agent should receive the
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// original user message and text responses from prior agents (as User role), but
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// NOT any handoff function call or tool result messages.
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List<ChatMessage>? capturedSecondAgentMessages = null;
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List<ChatMessage>? capturedThirdAgentMessages = null;
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var initialAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
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{
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string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
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Assert.NotNull(transferFuncName);
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// Return both a text message and a handoff function call
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return new(new ChatMessage(ChatRole.Assistant, [new TextContent("Routing to second agent"), new FunctionCallContent("call1", transferFuncName)]));
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}), name: "initialAgent");
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var secondAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
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{
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capturedSecondAgentMessages = messages.ToList();
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string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
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Assert.NotNull(transferFuncName);
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// Return both a text message and a handoff function call
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return new(new ChatMessage(ChatRole.Assistant, [new TextContent("Routing to third agent"), new FunctionCallContent("call2", transferFuncName)]));
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}), name: "secondAgent", description: "The second agent");
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var thirdAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
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{
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capturedThirdAgentMessages = messages.ToList();
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return new(new ChatMessage(ChatRole.Assistant, "Hello from agent3"));
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}),
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name: "thirdAgent",
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description: "The third / final agent");
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var workflow =
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AgentWorkflowBuilder.CreateHandoffBuilderWith(initialAgent)
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.WithHandoff(initialAgent, secondAgent)
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.WithHandoff(secondAgent, thirdAgent)
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.Build();
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(string updateText, _, _) = await RunWorkflowAsync(workflow, [new ChatMessage(ChatRole.User, "abc")]);
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Assert.Contains("Hello from agent3", updateText);
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// Second agent should see the original user message and initialAgent's text as context
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Assert.NotNull(capturedSecondAgentMessages);
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Assert.Contains(capturedSecondAgentMessages, m => m.Text == "abc");
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Assert.Contains(capturedSecondAgentMessages, m => m.Text!.Contains("Routing to second agent"));
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Assert.DoesNotContain(capturedSecondAgentMessages, m => m.Contents.Any(c => c is FunctionCallContent fcc && fcc.Name.StartsWith("handoff_to_", StringComparison.Ordinal)));
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Assert.DoesNotContain(capturedSecondAgentMessages, m => m.Role == ChatRole.Tool && m.Contents.Any(c => c is FunctionResultContent));
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// Third agent should see the original user message and both prior agents' text as context
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Assert.NotNull(capturedThirdAgentMessages);
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Assert.Contains(capturedThirdAgentMessages, m => m.Text == "abc");
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Assert.Contains(capturedThirdAgentMessages, m => m.Text!.Contains("Routing to second agent"));
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Assert.Contains(capturedThirdAgentMessages, m => m.Text!.Contains("Routing to third agent"));
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Assert.DoesNotContain(capturedThirdAgentMessages, m => m.Contents.Any(c => c is FunctionCallContent fcc && fcc.Name.StartsWith("handoff_to_", StringComparison.Ordinal)));
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Assert.DoesNotContain(capturedThirdAgentMessages, m => m.Role == ChatRole.Tool && m.Contents.Any(c => c is FunctionResultContent));
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}
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[Fact]
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public async Task Handoffs_FilteringNone_HandoffTargetReceivesAllMessagesIncludingToolCallsAsync()
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{
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// With filtering set to None, the target agent should see everything including
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// handoff function calls and tool results.
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List<ChatMessage>? capturedNextAgentMessages = null;
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var initialAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
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{
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string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
|
|
Assert.NotNull(transferFuncName);
|
|
|
|
return new(new ChatMessage(ChatRole.Assistant, [new FunctionCallContent("call1", transferFuncName)]));
|
|
}), name: "initialAgent");
|
|
|
|
var nextAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
capturedNextAgentMessages = messages.ToList();
|
|
return new(new ChatMessage(ChatRole.Assistant, "response"));
|
|
}),
|
|
name: "nextAgent",
|
|
description: "The second agent");
|
|
|
|
var workflow =
|
|
AgentWorkflowBuilder.CreateHandoffBuilderWith(initialAgent)
|
|
.WithHandoff(initialAgent, nextAgent)
|
|
.WithToolCallFilteringBehavior(HandoffToolCallFilteringBehavior.None)
|
|
.Build();
|
|
|
|
_ = await RunWorkflowAsync(workflow, [new ChatMessage(ChatRole.User, "hello")]);
|
|
|
|
Assert.NotNull(capturedNextAgentMessages);
|
|
Assert.Contains(capturedNextAgentMessages, m => m.Text == "hello");
|
|
|
|
// With None filtering, handoff function calls and tool results should be visible
|
|
Assert.Contains(capturedNextAgentMessages, m => m.Contents.Any(c => c is FunctionCallContent fcc && fcc.Name.StartsWith("handoff_to_", StringComparison.Ordinal)));
|
|
Assert.Contains(capturedNextAgentMessages, m => m.Contents.Any(c => c is FunctionResultContent));
|
|
}
|
|
|
|
[Fact]
|
|
public async Task Handoffs_FilteringAll_HandoffTargetDoesNotReceiveAnyToolCallsAsync()
|
|
{
|
|
// With filtering set to All, the target agent should see no function calls or tool
|
|
// results at all — not even non-handoff ones from prior conversation history.
|
|
|
|
List<ChatMessage>? capturedNextAgentMessages = null;
|
|
|
|
var initialAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
|
|
Assert.NotNull(transferFuncName);
|
|
|
|
return new(new ChatMessage(ChatRole.Assistant, [new TextContent("Routing you now"), new FunctionCallContent("call1", transferFuncName)]));
|
|
}), name: "initialAgent");
|
|
|
|
var nextAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
capturedNextAgentMessages = messages.ToList();
|
|
return new(new ChatMessage(ChatRole.Assistant, "response"));
|
|
}),
|
|
name: "nextAgent",
|
|
description: "The second agent");
|
|
|
|
var workflow =
|
|
AgentWorkflowBuilder.CreateHandoffBuilderWith(initialAgent)
|
|
.WithHandoff(initialAgent, nextAgent)
|
|
.WithToolCallFilteringBehavior(HandoffToolCallFilteringBehavior.All)
|
|
.Build();
|
|
|
|
// Input includes a pre-existing non-handoff tool call in the conversation history
|
|
List<ChatMessage> input =
|
|
[
|
|
new(ChatRole.User, "What's the weather? Also help me with math."),
|
|
new(ChatRole.Assistant, [new FunctionCallContent("toolcall1", "get_weather")]) { AuthorName = "initialAgent" },
|
|
new(ChatRole.Tool, [new FunctionResultContent("toolcall1", "sunny")]),
|
|
new(ChatRole.Assistant, "The weather is sunny. Now let me route your math question.") { AuthorName = "initialAgent" },
|
|
];
|
|
|
|
_ = await RunWorkflowAsync(workflow, input);
|
|
|
|
Assert.NotNull(capturedNextAgentMessages);
|
|
|
|
// With All filtering, NO function calls or tool results should be visible
|
|
Assert.DoesNotContain(capturedNextAgentMessages, m => m.Contents.Any(c => c is FunctionCallContent));
|
|
Assert.DoesNotContain(capturedNextAgentMessages, m => m.Role == ChatRole.Tool);
|
|
|
|
// But text content should still be visible
|
|
Assert.Contains(capturedNextAgentMessages, m => m.Text!.Contains("What's the weather"));
|
|
Assert.Contains(capturedNextAgentMessages, m => m.Text!.Contains("Routing you now"));
|
|
}
|
|
|
|
[Fact]
|
|
public async Task Handoffs_FilteringHandoffOnly_PreservesNonHandoffToolCallsAsync()
|
|
{
|
|
// With HandoffOnly filtering (the default), non-handoff function calls and tool
|
|
// results should be preserved while handoff ones are stripped.
|
|
|
|
List<ChatMessage>? capturedNextAgentMessages = null;
|
|
|
|
var initialAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
|
|
Assert.NotNull(transferFuncName);
|
|
|
|
return new(new ChatMessage(ChatRole.Assistant, [new FunctionCallContent("call1", transferFuncName)]));
|
|
}), name: "initialAgent");
|
|
|
|
var nextAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
capturedNextAgentMessages = messages.ToList();
|
|
return new(new ChatMessage(ChatRole.Assistant, "response"));
|
|
}),
|
|
name: "nextAgent",
|
|
description: "The second agent");
|
|
|
|
var workflow =
|
|
AgentWorkflowBuilder.CreateHandoffBuilderWith(initialAgent)
|
|
.WithHandoff(initialAgent, nextAgent)
|
|
.WithToolCallFilteringBehavior(HandoffToolCallFilteringBehavior.HandoffOnly)
|
|
.Build();
|
|
|
|
// Input includes a pre-existing non-handoff tool call in the conversation history
|
|
List<ChatMessage> input =
|
|
[
|
|
new(ChatRole.User, "What's the weather? Also help me with math."),
|
|
new(ChatRole.Assistant, [new FunctionCallContent("toolcall1", "get_weather")]) { AuthorName = "initialAgent" },
|
|
new(ChatRole.Tool, [new FunctionResultContent("toolcall1", "sunny")]),
|
|
new(ChatRole.Assistant, "The weather is sunny. Now let me route your math question.") { AuthorName = "initialAgent" },
|
|
];
|
|
|
|
_ = await RunWorkflowAsync(workflow, input);
|
|
|
|
Assert.NotNull(capturedNextAgentMessages);
|
|
|
|
// Handoff function calls and their tool results should be filtered
|
|
Assert.DoesNotContain(capturedNextAgentMessages, m => m.Contents.Any(c => c is FunctionCallContent fcc && fcc.Name.StartsWith("handoff_to_", StringComparison.Ordinal)));
|
|
|
|
// Non-handoff function calls and their tool results should be preserved
|
|
Assert.Contains(capturedNextAgentMessages, m => m.Contents.Any(c => c is FunctionCallContent fcc && fcc.Name == "get_weather"));
|
|
Assert.Contains(capturedNextAgentMessages, m => m.Role == ChatRole.Tool && m.Contents.Any(c => c is FunctionResultContent frc && frc.CallId == "toolcall1"));
|
|
}
|
|
|
|
[Fact]
|
|
public async Task Handoffs_TwoTransfers_ResponseServedByThirdAgentAsync()
|
|
{
|
|
var initialAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
ChatMessage message = Assert.Single(messages);
|
|
Assert.Equal("abc", Assert.IsType<TextContent>(Assert.Single(message.Contents)).Text);
|
|
|
|
string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
|
|
Assert.NotNull(transferFuncName);
|
|
|
|
// Only a handoff function call.
|
|
return new(new ChatMessage(ChatRole.Assistant, [new FunctionCallContent("call1", transferFuncName)]));
|
|
}), name: "initialAgent");
|
|
|
|
var secondAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
// Second agent should receive the conversation so far (including previous assistant + tool messages eventually).
|
|
string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
|
|
Assert.NotNull(transferFuncName);
|
|
|
|
return new(new ChatMessage(ChatRole.Assistant, [new FunctionCallContent("call2", transferFuncName)]));
|
|
}), name: "secondAgent", description: "The second agent");
|
|
|
|
var thirdAgent = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
new(new ChatMessage(ChatRole.Assistant, "Hello from agent3"))),
|
|
name: "thirdAgent",
|
|
description: "The third / final agent");
|
|
|
|
var workflow =
|
|
AgentWorkflowBuilder.CreateHandoffBuilderWith(initialAgent)
|
|
.WithHandoff(initialAgent, secondAgent)
|
|
.WithHandoff(secondAgent, thirdAgent)
|
|
.Build();
|
|
|
|
(string updateText, List<ChatMessage>? result, _) = await RunWorkflowAsync(workflow, [new ChatMessage(ChatRole.User, "abc")]);
|
|
|
|
Assert.Equal("Hello from agent3", updateText);
|
|
Assert.NotNull(result);
|
|
|
|
// User + (assistant empty + tool) for each of first two agents + final assistant with text.
|
|
Assert.Equal(6, result.Count);
|
|
|
|
Assert.Equal(ChatRole.User, result[0].Role);
|
|
Assert.Equal("abc", result[0].Text);
|
|
|
|
Assert.Equal(ChatRole.Assistant, result[1].Role);
|
|
Assert.Equal("", result[1].Text);
|
|
Assert.Contains("initialAgent", result[1].AuthorName);
|
|
|
|
Assert.Equal(ChatRole.Tool, result[2].Role);
|
|
Assert.Contains("initialAgent", result[2].AuthorName);
|
|
|
|
Assert.Equal(ChatRole.Assistant, result[3].Role);
|
|
Assert.Equal("", result[3].Text);
|
|
Assert.Contains("secondAgent", result[3].AuthorName);
|
|
|
|
Assert.Equal(ChatRole.Tool, result[4].Role);
|
|
Assert.Contains("secondAgent", result[4].AuthorName);
|
|
|
|
Assert.Equal(ChatRole.Assistant, result[5].Role);
|
|
Assert.Equal("Hello from agent3", result[5].Text);
|
|
Assert.Contains("thirdAgent", result[5].AuthorName);
|
|
}
|
|
|
|
[Theory]
|
|
[InlineData(1)]
|
|
[InlineData(2)]
|
|
[InlineData(3)]
|
|
[InlineData(4)]
|
|
[InlineData(5)]
|
|
public async Task BuildGroupChat_AgentsRunInOrderAsync(int maxIterations)
|
|
{
|
|
const int NumAgents = 3;
|
|
var workflow = AgentWorkflowBuilder.CreateGroupChatBuilderWith(agents => new RoundRobinGroupChatManager(agents) { MaximumIterationCount = maxIterations })
|
|
.AddParticipants(new DoubleEchoAgent("agent1"), new DoubleEchoAgent("agent2"))
|
|
.AddParticipants(new DoubleEchoAgent("agent3"))
|
|
.Build();
|
|
|
|
for (int iter = 0; iter < 3; iter++)
|
|
{
|
|
const string UserInput = "abc";
|
|
(string updateText, List<ChatMessage>? result, _) = await RunWorkflowAsync(workflow, [new ChatMessage(ChatRole.User, UserInput)]);
|
|
|
|
Assert.NotNull(result);
|
|
Assert.Equal(maxIterations + 1, result.Count);
|
|
|
|
Assert.Equal(ChatRole.User, result[0].Role);
|
|
Assert.Null(result[0].AuthorName);
|
|
Assert.Equal(UserInput, result[0].Text);
|
|
|
|
string[] texts = new string[maxIterations + 1];
|
|
texts[0] = UserInput;
|
|
string expectedTotal = string.Empty;
|
|
for (int i = 1; i < maxIterations + 1; i++)
|
|
{
|
|
string id = $"agent{((i - 1) % NumAgents) + 1}";
|
|
texts[i] = $"{id}{Double(string.Concat(texts.Take(i)))}";
|
|
Assert.Equal(ChatRole.Assistant, result[i].Role);
|
|
Assert.Equal(id, result[i].AuthorName);
|
|
Assert.Equal(texts[i], result[i].Text);
|
|
expectedTotal += texts[i];
|
|
}
|
|
|
|
Assert.Equal(expectedTotal, updateText);
|
|
Assert.Equal(UserInput + expectedTotal, string.Concat(result));
|
|
|
|
static string Double(string s) => s + s;
|
|
}
|
|
}
|
|
|
|
[Fact]
|
|
public async Task Handoffs_ReturnToPrevious_DisabledByDefault_SecondTurnRoutesViaCoordinatorAsync()
|
|
{
|
|
int coordinatorCallCount = 0;
|
|
|
|
var coordinator = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
coordinatorCallCount++;
|
|
if (coordinatorCallCount == 1)
|
|
{
|
|
string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
|
|
Assert.NotNull(transferFuncName);
|
|
return new(new ChatMessage(ChatRole.Assistant, [new FunctionCallContent("call1", transferFuncName)]));
|
|
}
|
|
return new(new ChatMessage(ChatRole.Assistant, "coordinator responded on turn 2"));
|
|
}), name: "coordinator");
|
|
|
|
var specialist = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
new(new ChatMessage(ChatRole.Assistant, "specialist responded"))),
|
|
name: "specialist", description: "The specialist agent");
|
|
|
|
var workflow = AgentWorkflowBuilder.CreateHandoffBuilderWith(coordinator)
|
|
.WithHandoff(coordinator, specialist)
|
|
.Build();
|
|
|
|
CheckpointManager checkpointManager = CheckpointManager.CreateInMemory();
|
|
const ExecutionEnvironment Environment = ExecutionEnvironment.InProcess_Lockstep;
|
|
|
|
// Turn 1: coordinator hands off to specialist
|
|
WorkflowRunResult result = await RunWorkflowCheckpointedAsync(workflow, [new ChatMessage(ChatRole.User, "book an appointment")], Environment, checkpointManager);
|
|
Assert.Equal(1, coordinatorCallCount);
|
|
|
|
// Turn 2: without ReturnToPrevious, coordinator should be invoked again
|
|
_ = await RunWorkflowCheckpointedAsync(workflow, [new ChatMessage(ChatRole.User, "my id is 12345")], Environment, checkpointManager, result.LastCheckpoint);
|
|
Assert.Equal(2, coordinatorCallCount);
|
|
}
|
|
|
|
[Fact]
|
|
public async Task Handoffs_ReturnToPrevious_Enabled_SecondTurnRoutesDirectlyToSpecialistAsync()
|
|
{
|
|
int coordinatorCallCount = 0;
|
|
int specialistCallCount = 0;
|
|
|
|
var coordinator = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
coordinatorCallCount++;
|
|
string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
|
|
Assert.NotNull(transferFuncName);
|
|
return new(new ChatMessage(ChatRole.Assistant, [new FunctionCallContent("call1", transferFuncName)]));
|
|
}), name: "coordinator");
|
|
|
|
var specialist = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
specialistCallCount++;
|
|
return new(new ChatMessage(ChatRole.Assistant, "specialist responded"));
|
|
}), name: "specialist", description: "The specialist agent");
|
|
|
|
var workflow = AgentWorkflowBuilder.CreateHandoffBuilderWith(coordinator)
|
|
.WithHandoff(coordinator, specialist)
|
|
.EnableReturnToPrevious()
|
|
.Build();
|
|
|
|
CheckpointManager checkpointManager = CheckpointManager.CreateInMemory();
|
|
const ExecutionEnvironment Environment = ExecutionEnvironment.InProcess_Lockstep;
|
|
|
|
// Turn 1: coordinator hands off to specialist
|
|
WorkflowRunResult result = await RunWorkflowCheckpointedAsync(workflow, [new ChatMessage(ChatRole.User, "book an appointment")], Environment, checkpointManager);
|
|
Assert.Equal(1, coordinatorCallCount);
|
|
Assert.Equal(1, specialistCallCount);
|
|
|
|
// Turn 2: with ReturnToPrevious, specialist should be invoked directly, coordinator should NOT be called again
|
|
_ = await RunWorkflowCheckpointedAsync(workflow, [new ChatMessage(ChatRole.User, "my id is 12345")], Environment, checkpointManager, result.LastCheckpoint);
|
|
Assert.Equal(1, coordinatorCallCount); // coordinator NOT called again
|
|
Assert.Equal(2, specialistCallCount); // specialist called again
|
|
}
|
|
|
|
[Fact]
|
|
public async Task Handoffs_ReturnToPrevious_Enabled_BeforeAnyHandoff_RoutesViaInitialAgentAsync()
|
|
{
|
|
int coordinatorCallCount = 0;
|
|
|
|
var coordinator = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
coordinatorCallCount++;
|
|
return new(new ChatMessage(ChatRole.Assistant, "coordinator responded"));
|
|
}), name: "coordinator");
|
|
|
|
var specialist = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
Assert.Fail("Specialist should not be invoked.");
|
|
return new();
|
|
}), name: "specialist", description: "The specialist agent");
|
|
|
|
var workflow = AgentWorkflowBuilder.CreateHandoffBuilderWith(coordinator)
|
|
.WithHandoff(coordinator, specialist)
|
|
.EnableReturnToPrevious()
|
|
.Build();
|
|
|
|
// First turn with no prior handoff: should route to initial (coordinator) agent
|
|
_ = await RunWorkflowAsync(workflow, [new ChatMessage(ChatRole.User, "hello")]);
|
|
Assert.Equal(1, coordinatorCallCount);
|
|
}
|
|
|
|
[Fact]
|
|
public async Task Handoffs_ReturnToPrevious_Enabled_AfterHandoffBackToCoordinator_NextTurnRoutesViaCoordinatorAsync()
|
|
{
|
|
int coordinatorCallCount = 0;
|
|
int specialistCallCount = 0;
|
|
|
|
var coordinator = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
coordinatorCallCount++;
|
|
if (coordinatorCallCount == 1)
|
|
{
|
|
// First call: hand off to specialist
|
|
string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
|
|
Assert.NotNull(transferFuncName);
|
|
return new(new ChatMessage(ChatRole.Assistant, [new FunctionCallContent("call1", transferFuncName)]));
|
|
}
|
|
// Subsequent calls: respond without handoff
|
|
return new(new ChatMessage(ChatRole.Assistant, "coordinator responded"));
|
|
}), name: "coordinator");
|
|
|
|
var specialist = new ChatClientAgent(new MockChatClient((messages, options) =>
|
|
{
|
|
specialistCallCount++;
|
|
// Specialist hands back to coordinator
|
|
string? transferFuncName = options?.Tools?.FirstOrDefault(t => t.Name.StartsWith("handoff_to_", StringComparison.Ordinal))?.Name;
|
|
Assert.NotNull(transferFuncName);
|
|
return new(new ChatMessage(ChatRole.Assistant, [new FunctionCallContent("call2", transferFuncName)]));
|
|
}), name: "specialist", description: "The specialist agent");
|
|
|
|
var workflow = AgentWorkflowBuilder.CreateHandoffBuilderWith(coordinator)
|
|
.WithHandoff(coordinator, specialist)
|
|
.WithHandoff(specialist, coordinator)
|
|
.EnableReturnToPrevious()
|
|
.Build();
|
|
|
|
CheckpointManager checkpointManager = CheckpointManager.CreateInMemory();
|
|
const ExecutionEnvironment Environment = ExecutionEnvironment.InProcess_Lockstep;
|
|
|
|
// Turn 1: coordinator → specialist → coordinator (specialist hands back)
|
|
WorkflowRunResult result = await RunWorkflowCheckpointedAsync(workflow, [new ChatMessage(ChatRole.User, "book an appointment")], Environment, checkpointManager);
|
|
Assert.Equal(2, coordinatorCallCount); // called twice: initial handoff + receiving handback
|
|
Assert.Equal(1, specialistCallCount); // specialist called once, then handed back
|
|
|
|
// Turn 2: after handoff back to coordinator, should route to coordinator (not specialist)
|
|
_ = await RunWorkflowCheckpointedAsync(workflow, [new ChatMessage(ChatRole.User, "never mind")], Environment, checkpointManager, result.LastCheckpoint);
|
|
Assert.Equal(3, coordinatorCallCount); // coordinator called again on turn 2
|
|
Assert.Equal(1, specialistCallCount); // specialist NOT called
|
|
}
|
|
|
|
private sealed record WorkflowRunResult(string UpdateText, List<ChatMessage>? Result, CheckpointInfo? LastCheckpoint);
|
|
|
|
private static Task<WorkflowRunResult> RunWorkflowCheckpointedAsync(
|
|
Workflow workflow, List<ChatMessage> input, ExecutionEnvironment executionEnvironment, CheckpointManager checkpointManager, CheckpointInfo? fromCheckpoint = null)
|
|
{
|
|
InProcessExecutionEnvironment environment = executionEnvironment.ToWorkflowExecutionEnvironment()
|
|
.WithCheckpointing(checkpointManager);
|
|
|
|
return RunWorkflowCheckpointedAsync(workflow, input, environment, fromCheckpoint);
|
|
}
|
|
|
|
private static async Task<WorkflowRunResult> RunWorkflowCheckpointedAsync(
|
|
Workflow workflow, List<ChatMessage> input, InProcessExecutionEnvironment environment, CheckpointInfo? fromCheckpoint = null)
|
|
{
|
|
await using StreamingRun run =
|
|
fromCheckpoint != null ? await environment.ResumeStreamingAsync(workflow, fromCheckpoint)
|
|
: await environment.OpenStreamingAsync(workflow);
|
|
|
|
await run.TrySendMessageAsync(input);
|
|
await run.TrySendMessageAsync(new TurnToken(emitEvents: true));
|
|
|
|
StringBuilder sb = new();
|
|
WorkflowOutputEvent? output = null;
|
|
CheckpointInfo? lastCheckpoint = null;
|
|
await foreach (WorkflowEvent evt in run.WatchStreamAsync().ConfigureAwait(false))
|
|
{
|
|
switch (evt)
|
|
{
|
|
case AgentResponseUpdateEvent executorComplete:
|
|
sb.Append(executorComplete.Data);
|
|
break;
|
|
|
|
case WorkflowOutputEvent e:
|
|
output = e;
|
|
break;
|
|
|
|
case WorkflowErrorEvent errorEvent:
|
|
Assert.Fail($"Workflow execution failed with error: {errorEvent.Exception}");
|
|
break;
|
|
|
|
case SuperStepCompletedEvent stepCompleted:
|
|
lastCheckpoint = stepCompleted.CompletionInfo?.Checkpoint;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return new(sb.ToString(), output?.As<List<ChatMessage>>(), lastCheckpoint);
|
|
}
|
|
|
|
private static Task<WorkflowRunResult> RunWorkflowAsync(
|
|
Workflow workflow, List<ChatMessage> input, ExecutionEnvironment executionEnvironment = ExecutionEnvironment.InProcess_Lockstep)
|
|
=> RunWorkflowCheckpointedAsync(workflow, input, executionEnvironment.ToWorkflowExecutionEnvironment());
|
|
|
|
private sealed class DoubleEchoAgentWithBarrier(string name, StrongBox<TaskCompletionSource<bool>> barrier, StrongBox<int> remaining) : DoubleEchoAgent(name)
|
|
{
|
|
protected override async IAsyncEnumerable<AgentResponseUpdate> RunCoreStreamingAsync(
|
|
IEnumerable<ChatMessage> messages, AgentSession? session = null, AgentRunOptions? options = null, [EnumeratorCancellation] CancellationToken cancellationToken = default)
|
|
{
|
|
if (Interlocked.Decrement(ref remaining.Value) == 0)
|
|
{
|
|
barrier.Value!.SetResult(true);
|
|
}
|
|
|
|
await barrier.Value!.Task.ConfigureAwait(false);
|
|
|
|
await foreach (var update in base.RunCoreStreamingAsync(messages, session, options, cancellationToken))
|
|
{
|
|
await Task.Yield();
|
|
yield return update;
|
|
}
|
|
}
|
|
}
|
|
|
|
private sealed class MockChatClient(Func<IEnumerable<ChatMessage>, ChatOptions?, ChatResponse> responseFactory) : IChatClient
|
|
{
|
|
public Task<ChatResponse> GetResponseAsync(IEnumerable<ChatMessage> messages, ChatOptions? options = null, CancellationToken cancellationToken = default) =>
|
|
Task.FromResult(responseFactory(messages, options));
|
|
|
|
public async IAsyncEnumerable<ChatResponseUpdate> GetStreamingResponseAsync(
|
|
IEnumerable<ChatMessage> messages, ChatOptions? options = null, [EnumeratorCancellation] CancellationToken cancellationToken = default)
|
|
{
|
|
foreach (var update in (await this.GetResponseAsync(messages, options, cancellationToken).ConfigureAwait(false)).ToChatResponseUpdates())
|
|
{
|
|
yield return update;
|
|
}
|
|
}
|
|
|
|
public object? GetService(Type serviceType, object? serviceKey = null) => null;
|
|
public void Dispose() { }
|
|
}
|
|
}
|