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

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
@@ -57,9 +57,9 @@ public static class InProcessExecution
public static ValueTask<Checkpointed<StreamingRun>> StreamAsync<TInput>(Workflow workflow, TInput input, CheckpointManager checkpointManager, string? runId = null, CancellationToken cancellationToken = default) where TInput : notnull
=> Default.StreamAsync(workflow, input, checkpointManager, runId, cancellationToken);
/// <inheritdoc cref="IWorkflowExecutionEnvironment.ResumeStreamAsync(Workflow, CheckpointInfo, CheckpointManager, string?, CancellationToken)"/>
public static ValueTask<Checkpointed<StreamingRun>> ResumeStreamAsync(Workflow workflow, CheckpointInfo fromCheckpoint, CheckpointManager checkpointManager, string? runId = null, CancellationToken cancellationToken = default)
=> Default.ResumeStreamAsync(workflow, fromCheckpoint, checkpointManager, runId, cancellationToken);
/// <inheritdoc cref="IWorkflowExecutionEnvironment.ResumeStreamAsync(Workflow, CheckpointInfo, CheckpointManager, CancellationToken)"/>
public static ValueTask<Checkpointed<StreamingRun>> ResumeStreamAsync(Workflow workflow, CheckpointInfo fromCheckpoint, CheckpointManager checkpointManager, CancellationToken cancellationToken = default)
=> Default.ResumeStreamAsync(workflow, fromCheckpoint, checkpointManager, cancellationToken);
/// <inheritdoc cref="IWorkflowExecutionEnvironment.RunAsync{TInput}(Workflow, TInput, string?, CancellationToken)"/>
public static ValueTask<Run> RunAsync<TInput>(Workflow workflow, TInput input, string? runId = null, CancellationToken cancellationToken = default) where TInput : notnull
@@ -69,7 +69,7 @@ public static class InProcessExecution
public static ValueTask<Checkpointed<Run>> RunAsync<TInput>(Workflow workflow, TInput input, CheckpointManager checkpointManager, string? runId = null, CancellationToken cancellationToken = default) where TInput : notnull
=> Default.RunAsync(workflow, input, checkpointManager, runId, cancellationToken);
/// <inheritdoc cref="IWorkflowExecutionEnvironment.ResumeAsync(Workflow, CheckpointInfo, CheckpointManager, string?, CancellationToken)"/>
public static ValueTask<Checkpointed<Run>> ResumeAsync(Workflow workflow, CheckpointInfo fromCheckpoint, CheckpointManager checkpointManager, string? runId = null, CancellationToken cancellationToken = default)
=> Default.ResumeAsync(workflow, fromCheckpoint, checkpointManager, runId, cancellationToken);
/// <inheritdoc cref="IWorkflowExecutionEnvironment.ResumeAsync(Workflow, CheckpointInfo, CheckpointManager, CancellationToken)"/>
public static ValueTask<Checkpointed<Run>> ResumeAsync(Workflow workflow, CheckpointInfo fromCheckpoint, CheckpointManager checkpointManager, CancellationToken cancellationToken = default)
=> Default.ResumeAsync(workflow, fromCheckpoint, checkpointManager, cancellationToken);
}