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.NET: Declarative workflows - Gracefully handle agent scenarios when no response is returned (#5376)

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* Gracefully handle agent scenarios when no response is returned

* Make relevant object disposable and improve exception handling.
This commit is contained in:
Peter Ibekwe
2026-04-21 08:04:49 -07:00
committed by GitHub
Unverified
parent d5777bc546
commit adcd2d33f5
5 changed files with 68 additions and 17 deletions
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dotnet/src/Microsoft.Agents.AI.Workflows.Declarative/ObjectModel/InvokeAzureAgentExecutor.cs
+17 -9
View File
@@ -49,7 +49,11 @@ internal sealed class InvokeAzureAgentExecutor(InvokeAzureAgent model, ResponseA
public async ValueTask ResumeAsync(IWorkflowContext context, ExternalInputResponse response, CancellationToken cancellationToken)
{
await context.SetLastMessageAsync(response.Messages.Last()).ConfigureAwait(false);
ChatMessage? lastMessage = response.Messages.LastOrDefault();
if (lastMessage is not null)
{
await context.SetLastMessageAsync(lastMessage).ConfigureAwait(false);
}
await this.InvokeAgentAsync(context, response.Messages, cancellationToken).ConfigureAwait(false);
}
@@ -85,15 +89,19 @@ internal sealed class InvokeAzureAgentExecutor(InvokeAzureAgent model, ResponseA
await this.AssignAsync(this.AgentOutput?.Messages?.Path, agentResponse.Messages.ToTable(), context).ConfigureAwait(false);
// Attempt to parse the last message as JSON and assign to the response object variable.
try
string? lastMessageText = agentResponse.Messages.LastOrDefault()?.Text;
if (!string.IsNullOrEmpty(lastMessageText))
{
JsonDocument jsonDocument = JsonDocument.Parse(agentResponse.Messages.Last().Text);
Dictionary<string, object?> objectProperties = jsonDocument.ParseRecord(VariableType.RecordType);
await this.AssignAsync(this.AgentOutput?.ResponseObject?.Path, objectProperties.ToFormula(), context).ConfigureAwait(false);
}
catch
{
// Not valid json, skip assignment.
try
{
using JsonDocument jsonDocument = JsonDocument.Parse(lastMessageText);
Dictionary<string, object?> objectProperties = jsonDocument.ParseRecord(VariableType.RecordType);
await this.AssignAsync(this.AgentOutput?.ResponseObject?.Path, objectProperties.ToFormula(), context).ConfigureAwait(false);
}
catch (JsonException)
{
// Not valid json, skip assignment.
}
}
if (this.Model.Input?.ExternalLoop?.When is not null)
dotnet/src/Microsoft.Agents.AI.Workflows.Declarative/ObjectModel/QuestionExecutor.cs
+7 -4
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@@ -122,10 +122,13 @@ internal sealed class QuestionExecutor(Question model, ResponseAgentProvider age
string? workflowConversationId = context.GetWorkflowConversation();
if (workflowConversationId is not null)
{
// Input message always defined if values has been extracted.
ChatMessage input = response.Messages.Last();
await agentProvider.CreateMessageAsync(workflowConversationId, input, cancellationToken).ConfigureAwait(false);
await context.SetLastMessageAsync(input).ConfigureAwait(false);
// Input message expected to be defined when values have been extracted, but guard defensively.
ChatMessage? input = response.Messages.LastOrDefault();
if (input is not null)
{
await agentProvider.CreateMessageAsync(workflowConversationId, input, cancellationToken).ConfigureAwait(false);
await context.SetLastMessageAsync(input).ConfigureAwait(false);
}
}
}
dotnet/src/Microsoft.Agents.AI.Workflows.Declarative/ObjectModel/RequestExternalInputExecutor.cs
+5 -1
View File
@@ -45,7 +45,11 @@ internal sealed class RequestExternalInputExecutor(RequestExternalInput model, R
await agentProvider.CreateMessageAsync(workflowConversationId, inputMessage, cancellationToken).ConfigureAwait(false);
}
}
await context.SetLastMessageAsync(response.Messages.Last()).ConfigureAwait(false);
ChatMessage? lastMessage = response.Messages.LastOrDefault();
if (lastMessage is not null)
{
await context.SetLastMessageAsync(lastMessage).ConfigureAwait(false);
}
await this.AssignAsync(this.Model.Variable?.Path, response.Messages.ToFormula(), context).ConfigureAwait(false);
await context.RaiseCompletionEventAsync(this.Model, cancellationToken).ConfigureAwait(false);