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fix: Subworkflows do not work well with HostAsAgent (#3240)

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Subworkflows run into issues with Checkpointing and the Chat Protocol:

* The concurrency rework made subtle changes in behaviour that introduced a hang when using subworkflows with ChatProtocol and streaming execution.
* The ResetAsync() implementation in WorkflowHostExecutor was improperly resetting the joinContext - this was happening on restore checkpoint _after_ the join context was attached when
* Subworkflows cannot be used as the start node when hosted AsAgent due to inability to treat Catch-All as a Chat Protocol
* Subworkflow ownership issue when used in non-concurrent mode after finishing a run

Also fixes:
* When ChatMessages are output by executors that are not agents, there is no corresponding AgentResponseUpdate/AgentResponse event

Breaking Changes
* [BREAKING CHANGE] It is possible to provide the wrong RunId when resuming from CheckpointInfo (even though the data already exists on CheckpointInfo)
This commit is contained in:
Jacob Alber
2026-01-22 16:01:47 +00:00
committed by GitHub
parent f47645cdc8
commit 4940d0ef36
23 changed files with 344 additions and 87 deletions
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dotnet/samples/GettingStarted/Workflows/Checkpoint/CheckpointAndRehydrate/Program.cs
+1 -1
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@@ -73,7 +73,7 @@ public static class Program
CheckpointInfo savedCheckpoint = checkpoints[CheckpointIndex];
await using Checkpointed<StreamingRun> newCheckpointedRun =
await InProcessExecution.ResumeStreamAsync(newWorkflow, savedCheckpoint, checkpointManager, checkpointedRun.Run.RunId);
await InProcessExecution.ResumeStreamAsync(newWorkflow, savedCheckpoint, checkpointManager);
await foreach (WorkflowEvent evt in newCheckpointedRun.Run.WatchStreamAsync())
{