fix: align orchestration behavior with agent framework docs

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

ARCHITECTURE.md

@@ -92,10 +92,10 @@ sequenceDiagram
     M->>M: Create run record and mark session running
     M->>S: run-turn command
     S->>C: Execute workflow
-    C-->>S: Partial output / tool activity / handoffs
+    C-->>S: Partial output / tool activity / handoffs / input requests
     S-->>M: Stream deltas and activity events
     M-->>R: Push session events and workspace updates
-    C-->>S: Final messages
+    C-->>S: Final messages or turn boundary
     S-->>M: Completion or error
     M->>M: Finalize run and persist state
     M-->>R: Final workspace snapshot
@@ -134,6 +134,8 @@ Patterns describe how agents collaborate. The architecture supports:
 - handoff flows
 - group chat style collaboration
 
+Their runtime semantics follow the Agent Framework orchestration model: sequential and group chat preserve a visible shared conversation, concurrent aggregates multiple independent responses into one turn, and handoff turns can end once the active agent has responded and is waiting for the next user input.
+
 Patterns are shared application data, not renderer-only configuration. That means the same pattern definition can drive validation, persistence, UI rendering, and sidecar execution.
 
 ### Sessions

README.md

@@ -36,10 +36,10 @@ Add a local folder when you want help that is grounded in your work. Eryx is des
 Eryx supports several ways of working:
 
 - **Single** for direct one-agent help
-- **Sequential** for step-by-step specialist workflows
-- **Concurrent** for parallel exploration
-- **Handoff** for agent-to-agent delegation
-- **Group chat** for collaborative multi-agent discussion
+- **Sequential** for pipeline-style work where each agent sees the full conversation and appends its contribution
+- **Concurrent** for parallel exploration where the final turn aggregates multiple independent responses
+- **Handoff** for agent-to-agent delegation, with the next user turn continuing when a specialist needs more input
+- **Group chat** for round-robin collaborative refinement across multiple agent turns
 
 ### Add global MCPs and LSPs
 

sidecar/src/Eryx.AgentHost/Services/CopilotWorkflowRunner.cs

@@ -47,8 +47,12 @@ public sealed class CopilotWorkflowRunner : ITurnWorkflowRunner
 
         await foreach (WorkflowEvent evt in run.WatchStreamAsync(cancellationToken).ConfigureAwait(false))
         {
-            await HandleWorkflowEventAsync(command, evt, inputMessages, state, onDelta, onActivity)
+            bool shouldEndTurn = await HandleWorkflowEventAsync(command, evt, inputMessages, state, onDelta, onActivity)
                 .ConfigureAwait(false);
+            if (shouldEndTurn)
+            {
+                break;
+            }
         }
 
         return state.FinalizeCompletedMessages();
@@ -61,7 +65,7 @@ public sealed class CopilotWorkflowRunner : ITurnWorkflowRunner
         return _approvalCoordinator.ResolveApprovalAsync(command, cancellationToken);
     }
 
-    private static async Task HandleWorkflowEventAsync(
+    private static async Task<bool> HandleWorkflowEventAsync(
         RunTurnCommandDto command,
         WorkflowEvent evt,
         IReadOnlyList<ChatMessage> inputMessages,
@@ -76,7 +80,7 @@ public sealed class CopilotWorkflowRunner : ITurnWorkflowRunner
                 out AgentIdentity invokedAgent))
         {
             await state.EmitThinkingIfNeeded(invokedAgent, onActivity).ConfigureAwait(false);
-            return;
+            return false;
         }
 
         if (evt is RequestInfoEvent requestInfo)
@@ -89,18 +93,18 @@ public sealed class CopilotWorkflowRunner : ITurnWorkflowRunner
 
             if (activity is null)
             {
-                return;
+                return WorkflowRequestInfoInterpreter.RequiresUserInputTurnBoundary(command, requestInfo);
             }
 
             state.ApplyActivity(activity);
             await onActivity(activity).ConfigureAwait(false);
-            return;
+            return false;
         }
 
         if (evt is AgentResponseUpdateEvent update)
         {
             await HandleAgentResponseUpdateAsync(command, update, state, onDelta, onActivity).ConfigureAwait(false);
-            return;
+            return false;
         }
 
         if (evt is ExecutorCompletedEvent completed
@@ -111,7 +115,7 @@ public sealed class CopilotWorkflowRunner : ITurnWorkflowRunner
                 out AgentIdentity completedAgent))
         {
             state.ClearActiveAgentIfMatching(completedAgent);
-            return;
+            return false;
         }
 
         if (evt is WorkflowOutputEvent outputEvent)
@@ -119,6 +123,8 @@ public sealed class CopilotWorkflowRunner : ITurnWorkflowRunner
             List<ChatMessage> allMessages = outputEvent.As<List<ChatMessage>>() ?? [];
             state.UpdateCompletedMessages(allMessages, inputMessages);
         }
+
+        return false;
     }
 
     private static async Task HandleAgentResponseUpdateAsync(

sidecar/src/Eryx.AgentHost/Services/WorkflowRequestInfoInterpreter.cs

@@ -52,6 +52,23 @@ internal static class WorkflowRequestInfoInterpreter
         };
     }
 
+    public static bool RequiresUserInputTurnBoundary(
+        RunTurnCommandDto command,
+        RequestInfoEvent requestInfo)
+    {
+        if (!string.Equals(command.Pattern.Mode, "handoff", StringComparison.OrdinalIgnoreCase))
+        {
+            return false;
+        }
+
+        if (TryGetHandoffTarget(command.Pattern, requestInfo, out _))
+        {
+            return false;
+        }
+
+        return !TryGetToolRequestInfo(requestInfo, out _, out _);
+    }
+
     private static bool TryGetHandoffTarget(
         PatternDefinitionDto pattern,
         RequestInfoEvent requestInfo,

sidecar/tests/Eryx.AgentHost.Tests/CopilotWorkflowRunnerTests.cs

@@ -156,6 +156,143 @@ public sealed class CopilotWorkflowRunnerTests
         Assert.Equal("Hello", message.Content);
     }
 
+    [Fact]
+    public void ProjectCompletedMessages_PreservesSequentialConversationHistory()
+    {
+        RunTurnCommandDto command = new()
+        {
+            RequestId = "turn-1",
+            SessionId = "session-1",
+            Pattern = new PatternDefinitionDto
+            {
+                Id = "pattern-sequential",
+                Name = "Sequential Trio Review",
+                Mode = "sequential",
+                Availability = "available",
+                Agents =
+                [
+                    CreateAgent(id: "agent-sequential-analyst", name: "Analyst"),
+                    CreateAgent(id: "agent-sequential-builder", name: "Builder"),
+                    CreateAgent(id: "agent-sequential-reviewer", name: "Reviewer"),
+                ],
+            },
+        };
+
+        IReadOnlyList<ChatMessageDto> messages = WorkflowTranscriptProjector.ProjectCompletedMessages(
+            command,
+            [
+                new ChatMessage(ChatRole.Assistant, "Plan the approach.") { AuthorName = "Analyst" },
+                new ChatMessage(ChatRole.Assistant, "Implement the change.") { AuthorName = "Builder" },
+                new ChatMessage(ChatRole.Assistant, "Review the implementation.") { AuthorName = "Reviewer" },
+            ],
+            []);
+
+        Assert.Collection(
+            messages,
+            analyst =>
+            {
+                Assert.Equal("Analyst", analyst.AuthorName);
+                Assert.Equal("Plan the approach.", analyst.Content);
+            },
+            builder =>
+            {
+                Assert.Equal("Builder", builder.AuthorName);
+                Assert.Equal("Implement the change.", builder.Content);
+            },
+            reviewer =>
+            {
+                Assert.Equal("Reviewer", reviewer.AuthorName);
+                Assert.Equal("Review the implementation.", reviewer.Content);
+            });
+    }
+
+    [Fact]
+    public void ProjectCompletedMessages_PreservesConcurrentAggregatedResponses()
+    {
+        RunTurnCommandDto command = new()
+        {
+            RequestId = "turn-1",
+            SessionId = "session-1",
+            Pattern = new PatternDefinitionDto
+            {
+                Id = "pattern-concurrent",
+                Name = "Concurrent Brainstorm",
+                Mode = "concurrent",
+                Availability = "available",
+                Agents =
+                [
+                    CreateAgent(id: "agent-concurrent-architect", name: "Architect"),
+                    CreateAgent(id: "agent-concurrent-product", name: "Product"),
+                    CreateAgent(id: "agent-concurrent-implementer", name: "Implementer"),
+                ],
+            },
+        };
+
+        IReadOnlyList<ChatMessageDto> messages = WorkflowTranscriptProjector.ProjectCompletedMessages(
+            command,
+            [
+                new ChatMessage(ChatRole.Assistant, "Architecture concerns.") { AuthorName = "Architect" },
+                new ChatMessage(ChatRole.Assistant, "Product trade-offs.") { AuthorName = "Product" },
+                new ChatMessage(ChatRole.Assistant, "Implementation details.") { AuthorName = "Implementer" },
+            ],
+            []);
+
+        Assert.Collection(
+            messages,
+            architect => Assert.Equal("Architect", architect.AuthorName),
+            product => Assert.Equal("Product", product.AuthorName),
+            implementer => Assert.Equal("Implementer", implementer.AuthorName));
+    }
+
+    [Fact]
+    public void ProjectCompletedMessages_PreservesGroupChatConversationHistory()
+    {
+        RunTurnCommandDto command = new()
+        {
+            RequestId = "turn-1",
+            SessionId = "session-1",
+            Pattern = new PatternDefinitionDto
+            {
+                Id = "pattern-group-chat",
+                Name = "Collaborative Group Chat",
+                Mode = "group-chat",
+                Availability = "available",
+                Agents =
+                [
+                    CreateAgent(id: "agent-group-writer", name: "Writer"),
+                    CreateAgent(id: "agent-group-reviewer", name: "Reviewer"),
+                ],
+            },
+        };
+
+        IReadOnlyList<ChatMessageDto> messages = WorkflowTranscriptProjector.ProjectCompletedMessages(
+            command,
+            [
+                new ChatMessage(ChatRole.Assistant, "Initial draft.") { AuthorName = "Writer" },
+                new ChatMessage(ChatRole.Assistant, "Needs clearer examples.") { AuthorName = "Reviewer" },
+                new ChatMessage(ChatRole.Assistant, "Revised draft with examples.") { AuthorName = "Writer" },
+            ],
+            []);
+
+        Assert.Collection(
+            messages,
+            writerDraft =>
+            {
+                Assert.Equal("Writer", writerDraft.AuthorName);
+                Assert.Equal("Initial draft.", writerDraft.Content);
+            },
+            reviewer =>
+            {
+                Assert.Equal("Reviewer", reviewer.AuthorName);
+                Assert.Equal("Needs clearer examples.", reviewer.Content);
+            },
+            writerRevision =>
+            {
+                Assert.Equal("Writer", writerRevision.AuthorName);
+                Assert.Equal("Revised draft with examples.", writerRevision.Content);
+            });
+    }
+
     [Fact]
     public void ProjectCompletedMessages_UsesFallbackAgentForGenericAssistantOutput()
     {

sidecar/tests/Eryx.AgentHost.Tests/WorkflowRequestInfoInterpreterTests.cs

@@ -109,6 +109,62 @@ public sealed class WorkflowRequestInfoInterpreterTests
         Assert.Empty(toolNamesByCallId);
     }
 
+    [Fact]
+    public void RequiresUserInputTurnBoundary_ReturnsTrueForUnhandledHandoffRequests()
+    {
+        RequestInfoEvent requestInfo = CreateRequestInfoEvent(new
+        {
+            Prompt = "Please provide more detail.",
+        });
+
+        bool requiresBoundary = WorkflowRequestInfoInterpreter.RequiresUserInputTurnBoundary(
+            CreateHandoffCommand(),
+            requestInfo);
+
+        Assert.True(requiresBoundary);
+    }
+
+    [Fact]
+    public void RequiresUserInputTurnBoundary_ReturnsFalseForExplicitHandoffs()
+    {
+        RequestInfoEvent requestInfo = CreateRequestInfoEvent(
+            CreateHandoffTarget("agent-handoff-ux", "UX Specialist"));
+
+        bool requiresBoundary = WorkflowRequestInfoInterpreter.RequiresUserInputTurnBoundary(
+            CreateHandoffCommand(),
+            requestInfo);
+
+        Assert.False(requiresBoundary);
+    }
+
+    [Fact]
+    public void RequiresUserInputTurnBoundary_ReturnsFalseForToolRequests()
+    {
+        RequestInfoEvent requestInfo = CreateRequestInfoEvent(
+            new FunctionCallContent("call-1", "view", new Dictionary<string, object?>()));
+
+        bool requiresBoundary = WorkflowRequestInfoInterpreter.RequiresUserInputTurnBoundary(
+            CreateHandoffCommand(),
+            requestInfo);
+
+        Assert.False(requiresBoundary);
+    }
+
+    [Fact]
+    public void RequiresUserInputTurnBoundary_ReturnsFalseOutsideHandoffMode()
+    {
+        RequestInfoEvent requestInfo = CreateRequestInfoEvent(new
+        {
+            Prompt = "Please provide more detail.",
+        });
+
+        bool requiresBoundary = WorkflowRequestInfoInterpreter.RequiresUserInputTurnBoundary(
+            CreateSingleAgentCommand(),
+            requestInfo);
+
+        Assert.False(requiresBoundary);
+    }
+
     private static RunTurnCommandDto CreateSingleAgentCommand()
     {
         return new RunTurnCommandDto

src/shared/domain/pattern.ts

@@ -90,7 +90,7 @@ export function createBuiltinPatterns(timestamp: string): PatternDefinition[] {
     {
       id: 'pattern-sequential-review',
       name: 'Sequential Trio Review',
-      description: 'Three Copilot-backed agents execute in order, refining the answer each step.',
+      description: 'Agents execute in order, each seeing the full conversation and appending to a shared transcript.',
       mode: 'sequential',
       availability: 'available',
       maxIterations: 1,
@@ -126,7 +126,7 @@ export function createBuiltinPatterns(timestamp: string): PatternDefinition[] {
     {
       id: 'pattern-concurrent-brainstorm',
       name: 'Concurrent Brainstorm',
-      description: 'Multiple agents respond in parallel for comparison or voting.',
+      description: 'Agents work independently in parallel and the final conversation aggregates every response.',
       mode: 'concurrent',
       availability: 'available',
       maxIterations: 1,
@@ -162,7 +162,7 @@ export function createBuiltinPatterns(timestamp: string): PatternDefinition[] {
     {
       id: 'pattern-handoff-support',
       name: 'Handoff Support Flow',
-      description: 'A triage agent routes the task to specialists and can reclaim control.',
+      description: 'A triage agent routes work to specialists, and the next user turn continues when more input is needed.',
       mode: 'handoff',
       availability: 'available',
       maxIterations: 4,
@@ -201,7 +201,7 @@ export function createBuiltinPatterns(timestamp: string): PatternDefinition[] {
     {
       id: 'pattern-group-chat',
       name: 'Collaborative Group Chat',
-      description: 'Two or more agents iterate together under a round-robin manager.',
+      description: 'Agents take turns under a round-robin manager, iteratively refining a shared conversation.',
       mode: 'group-chat',
       availability: 'available',
       maxIterations: 5,