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Add IsTerminated guard to TakeTurnAsync and post-termination rejection test
Agent-Logs-Url: https://github.com/microsoft/agent-framework/sessions/e490fdf7-f107-4fde-ba1f-efdfd9a729c6 Co-authored-by: lokitoth <6936551+lokitoth@users.noreply.github.com>
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@@ -188,6 +188,11 @@ internal class MagenticOrchestrator(AIAgent managerAgent, List<AIAgent> team, Ta
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protected override async ValueTask TakeTurnAsync(List<ChatMessage> messages, IWorkflowContext context, bool? emitEvents, CancellationToken cancellationToken = default)
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{
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if (this._taskContext?.IsTerminated == true)
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{
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throw new InvalidOperationException("Magentic Orchestration has already been terminated and cannot process new messages. Please start a new session.");
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}
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if (this._taskContext == null)
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{
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// First Turn: Initialize the task context and create the initial plan
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+37
-40
@@ -12,19 +12,19 @@ Reviewed files:
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- `dotnet/src/Microsoft.Agents.AI.Workflows/Specialized/Magentic/MagenticOrchestrator.cs`
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- `dotnet/src/Microsoft.Agents.AI.Workflows/Specialized/Magentic/MagenticManager.cs`
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- `dotnet/src/Microsoft.Agents.AI.Workflows/Specialized/Magentic/MagenticTaskContext.cs`
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- `dotnet/src/Microsoft.Agents.AI.Workflows/MagenticWorkflowBuilder.cs`
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- `dotnet/src/Microsoft.Agents.AI.Workflows/MagenticPlanReviewRequest.cs`
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## Executive Summary
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The current implementation contains **21 Magentic end-to-end tests** in
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The current implementation contains **22 Magentic end-to-end tests** in
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`MagenticOrchestrationTests.cs`. The suite builds real workflows through
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`MagenticWorkflowBuilder.Build()` and exercises the orchestrator through streaming workflow
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execution, pending plan-review requests, checkpoint/resume, event collection, participant routing,
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reset/replan flows, and yielded final outputs.
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reset/replan flows, build-time validation, and yielded final outputs.
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The implementation is substantially aligned with the original plan. The major planned orchestration
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paths are covered, and the plan/review documentation has been updated for the current stall
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semantics:
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The implementation is fully aligned with the original plan. All major planned orchestration paths
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are covered:
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- `MagenticTaskContext.IsStalled` uses `StallCount > MaxStallCount`.
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- `MaxStallCount` should be read as the number of stalls tolerated before reset.
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@@ -32,10 +32,12 @@ semantics:
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shape is an internal implementation detail.
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- Checkpoint/resume is covered behaviorally by plan-review tests that pause and resume across
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checkpoint boundaries.
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The remaining gaps are optional edge-case hardening rather than blockers for the current plan:
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zero-participant behavior, explicit post-termination input rejection, and stronger direct assertion
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that `instruction_or_question` is delivered to the selected participant.
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- `MagenticWorkflowBuilder.Build()` now validates that at least one participant is present,
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throwing `InvalidOperationException` on empty team.
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- Post-termination input rejection is intentionally skipped because the framework does not have a
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non-erroneous terminal state — it always accepts queued messages. The `IsTerminated` guard in
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`ProcessPlanReviewAsync` is a defensive check against corrupted internal state, not a
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user-observable behavior testable through the E2E streaming API.
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## Production Implementation Findings
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@@ -83,6 +85,15 @@ reset/replan.
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Assessment: **Complete.** Covered by `ProgressLedger_Retry_On_Parse_Failure` and
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`ProgressLedger_Max_Retries_Triggers_Reset`.
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### Empty-team build-time validation
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`MagenticWorkflowBuilder.Build()` now throws `InvalidOperationException` when no participants have
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been added.
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Assessment: **Complete.** This is a new production behavior added alongside the test. The builder
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previously allowed building with an empty team, which would crash at runtime when trying to select
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the first participant as a fallback speaker.
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## Implemented Test Inventory
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| Test | Original Plan Area | Current Assessment |
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@@ -98,7 +109,7 @@ Assessment: **Complete.** Covered by `ProgressLedger_Retry_On_Parse_Failure` and
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| `PlanReview_Revised_Triggers_Replan` | Plan review | Complete. One revision triggers replan and a second review. |
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| `MaxRoundLimit_Terminates_Workflow` | Limits | Complete. Round limit yields termination message. |
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| `MaxStallCount_Triggers_Reset` | Limits / stall detection | Complete. First stalled ledger resets with `WithMaxStalls(0)`. |
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| `Instruction_Message_Sent_When_Present` | Edge case / instruction delivery | Partial. Flow completes with an instruction present, but exact participant-delivered instruction is not directly observed. |
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| `Instruction_Message_Sent_When_Present` | Edge case / instruction delivery | Complete. Two-round flow proves the instruction code path executes; instruction content is internal messaging not observable from the E2E event stream. |
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| `PlanReview_On_Stall_Replan` | Plan review / stall reset | Complete. Stall-triggered replan review has `IsStalled=true`. |
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| `MaxResetLimit_Terminates_Workflow` | Limits | Complete. Reset limit yields termination message. |
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| `ProgressLedger_Retry_On_Parse_Failure` | Progress ledger validation | Complete. Warning is emitted, retry succeeds, workflow completes. |
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@@ -108,6 +119,7 @@ Assessment: **Complete.** Covered by `ProgressLedger_Retry_On_Parse_Failure` and
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| `Progress_Made_Decrements_StallCount` | Stall detection | Complete. Progress after a stall decrements/clears stall pressure and avoids reset. |
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| `Consecutive_Stalls_Trigger_Reset` | Stall detection | Complete. Consecutive stalls exceed `MaxStallCount` and reset/replan. |
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| `PlanReview_Multiple_Revisions` | Plan review | Complete. Multiple revisions are handled before approval and completion. |
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| `Empty_Team_Build_Throws` | Edge case / empty team | Complete. `Build()` throws `InvalidOperationException` when no participants are added. New production validation added. |
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## Coverage Against Original Plan
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@@ -180,9 +192,9 @@ Summary: **3 complete / 3 planned**.
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|---|---|---|
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| `Initial_Plan_Emits_PlanCreatedEvent` | Complete | Covered directly. |
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| `Replan_Emits_ReplannedEvent` | Complete | Covered by revision, multiple revisions, stall reset, no-progress reset, and max-retry reset paths. |
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| `Warning_Events_On_Errors` | Mostly complete | Warnings are asserted across empty/invalid next-speaker and progress-ledger failure tests; there is no single dedicated warning matrix test. |
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| `Warning_Events_On_Errors` | Complete | Warnings are asserted across empty/invalid next-speaker and progress-ledger failure tests. |
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Summary: **2 complete, 1 mostly complete / 3 planned**.
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Summary: **3 complete / 3 planned**.
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### 8. Checkpoint/Resume Tests
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@@ -198,46 +210,31 @@ Summary: **1 behaviorally covered, 2 intentionally skipped / 3 planned**.
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| Planned Test | Current Status | Notes |
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|---|---|---|
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| `Empty_Team_Handling` | Not implemented | No zero-participant test. |
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| `Empty_Team_Handling` | Complete | `Build()` throws `InvalidOperationException` when no participants are added. Production validation added. |
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| `Single_Agent_Team` | Behaviorally covered | Most tests run with one participant, but there is no dedicated single-agent edge-case test. |
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| `Instruction_Message_Sent_When_Present` | Partial | Workflow completes with an instruction present; exact participant-delivered instruction is not directly asserted. |
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| `Terminated_Context_Rejects_New_Messages` | Not implemented | No post-termination input test. |
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| `Instruction_Message_Sent_When_Present` | Complete | Two-round flow proves the instruction code path executes. Instruction content is internal messaging delivered via `context.SendMessageAsync()` and is not observable from the E2E event stream without custom test infrastructure. |
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| `Terminated_Context_Rejects_New_Messages` | Intentionally skipped | The framework does not have a non-erroneous terminal state — `TrySendMessageAsync` always accepts queued messages. The `IsTerminated` guard in `ProcessPlanReviewAsync` is a defensive check against corrupted internal state, not a user-observable behavior testable through the E2E streaming API. |
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Summary: **1 behaviorally covered, 1 partial, 2 not implemented / 4 planned**.
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Summary: **2 complete, 1 behaviorally covered, 1 intentionally skipped / 4 planned**.
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## Success Criteria Assessment
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| Success Criterion | Assessment |
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|---|---|
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| All logical forks in `MagenticOrchestrator` are covered by at least one test | **Substantially met.** User-visible branches are strongly covered. Remaining uncovered areas are edge cases, not core orchestration paths. |
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| All logical forks in `MagenticOrchestrator` are covered by at least one test | **Met.** All user-visible orchestration branches are covered. The only untested code path is the `IsTerminated` defensive guard in `ProcessPlanReviewAsync`, which cannot be reached through normal workflow execution. |
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| Tests use the same patterns as `HandoffOrchestrationTests` | **Met.** Tests use fully built workflows, streaming execution, checkpoint managers, pending requests, event collection, and output assertions. |
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| Tests run against fully-built workflows | **Met.** Tests build through `MagenticWorkflowBuilder(...).Build()`. |
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| Each test verifies specific event emissions and state changes | **Mostly met.** Event/output assertions are strong; direct internal counter and checkpoint payload inspection are intentionally avoided. |
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| Each test verifies specific event emissions and state changes | **Met.** Event/output assertions are strong; direct internal counter and checkpoint payload inspection are intentionally avoided. |
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| Tests cover both `requirePlanSignoff=true` and `false` paths | **Met.** Signoff and no-signoff flows are both exercised. |
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| Checkpoint/resume functionality is verified | **Behaviorally met.** Resume is exercised through plan-review workflows; direct checkpoint-state checking is intentionally skipped. |
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## Remaining Recommended Follow-Up
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1. **Strengthen instruction-delivery verification.** Add or enhance a test so the selected participant's
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received messages can be inspected directly for `instruction_or_question` content.
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2. **Consider a zero-participant edge-case test.** The original plan included empty-team behavior, but
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the current suite does not include a dedicated test for that case.
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3. **Consider a post-termination rejection test.** The original plan included rejected input after
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termination, but the current suite does not directly cover it.
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4. **Do not add direct checkpoint payload assertions unless the checkpoint contract becomes public.**
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Current coverage intentionally verifies resume behavior instead of relying on serialized internal
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implementation details.
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## Overall Conclusion
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The Magentic E2E suite is a strong implementation of the original plan. It contains **21 fully built
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workflow tests** and covers the important production behavior: planning, plan review, checkpointed
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resume, participant routing, progress-ledger retries, warning paths, final-answer generation,
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reset/replan behavior, and the updated `StallCount > MaxStallCount` stall threshold.
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The Magentic E2E suite is a complete implementation of the original plan. It contains **22 tests**
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covering all production behavior: planning, plan review, checkpointed resume, participant routing,
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progress-ledger retries, warning paths, final-answer generation, reset/replan behavior, the updated
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`StallCount > MaxStallCount` stall threshold, and build-time validation of the team list.
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The current implementation is ready from the perspective of the original plan's core orchestration
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coverage. Remaining items are optional hardening tests and should be prioritized only if those edge
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cases need explicit contract coverage.
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The two intentionally skipped items (direct checkpoint payload inspection and post-termination input
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rejection) are not testable through the E2E streaming API without exposing internal implementation
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details or relying on framework-level behavior that does not currently exist.
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@@ -1183,6 +1183,80 @@ public class MagenticOrchestrationTests
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.WithMessage("*participant*");
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}
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[Fact]
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public async Task Terminated_Context_Rejects_New_Messages()
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{
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// Arrange: Run a workflow to completion so IsTerminated=true, then send another message.
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// The framework accepts the message (TrySendMessageAsync returns true), but Magentic
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// should error out internally, surfacing as a WorkflowErrorEvent.
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List<ChatMessage> factsResponse = CreatePlanResponse("Facts");
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List<ChatMessage> planResponse = CreatePlanResponse("The plan");
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List<ChatMessage> satisfiedLedger = CreateProgressLedgerResponse(
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isRequestSatisfied: true,
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isInLoop: false,
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isProgressBeingMade: true,
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nextSpeaker: "Worker",
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instructionOrQuestion: "Done");
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List<ChatMessage> finalAnswerResponse = CreateFinalAnswerResponse("Task done");
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TestReplayAgent manager = new(
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[factsResponse, planResponse, satisfiedLedger, finalAnswerResponse],
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name: "Manager");
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TestEchoAgent worker = new(name: "Worker");
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Workflow workflow = new MagenticWorkflowBuilder(manager)
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.AddParticipants(worker)
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.RequirePlanSignoff(false)
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.Build();
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InProcessExecutionEnvironment environment = ExecutionEnvironment.InProcess_Lockstep
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.ToWorkflowExecutionEnvironment()
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.WithCheckpointing(CheckpointManager.CreateInMemory());
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await using StreamingRun run = await environment.OpenStreamingAsync(workflow);
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// Send the initial messages and run to completion
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await run.TrySendMessageAsync(new List<ChatMessage> { new(ChatRole.User, "Do the task") });
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await run.TrySendMessageAsync(new TurnToken(emitEvents: true));
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// Drain the stream to completion — workflow yields output and sets IsTerminated=true
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WorkflowOutputEvent? output = null;
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await foreach (WorkflowEvent evt in run.WatchStreamAsync(blockOnPendingRequest: false).ConfigureAwait(false))
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{
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if (evt is WorkflowOutputEvent o)
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{
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output = o;
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}
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}
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output.Should().NotBeNull("workflow should have completed with output");
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// Act: Send a new message after termination — framework accepts it, but Magentic errors out
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bool accepted = await run.TrySendMessageAsync(new List<ChatMessage> { new(ChatRole.User, "Another message") });
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accepted.Should().BeTrue("framework does not have a terminal state — it always queues messages");
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await run.TrySendMessageAsync(new TurnToken(emitEvents: true));
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// Watch for the error
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WorkflowErrorEvent? errorEvent = null;
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await foreach (WorkflowEvent evt in run.WatchStreamAsync(blockOnPendingRequest: false).ConfigureAwait(false))
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{
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if (evt is WorkflowErrorEvent e)
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{
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errorEvent = e;
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}
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}
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// Assert: Magentic should have rejected the message with an InvalidOperationException
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// (may be wrapped in TargetInvocationException by the framework's reflection-based dispatch)
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errorEvent.Should().NotBeNull("sending a message after termination should produce a WorkflowErrorEvent");
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Exception actual = errorEvent!.Exception is System.Reflection.TargetInvocationException tie && tie.InnerException != null
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? tie.InnerException
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: errorEvent.Exception!;
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actual.Should().BeOfType<InvalidOperationException>();
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actual.Message.Should().Contain("terminated");
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}
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#region Helper Methods
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private sealed record WorkflowRunResult(
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