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.NET: Support InvokeMcpTool for declarative workflows (#4204)

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* Initial implementation of InvokeMcpTool in declarative workflow

* Cleaned up sample implementation

* Updated sample comments.

* Added missing executor routing attribute

* Fix PR comments.

* Updated based on PR comments.

* Updated based on PR comments.

* Removed unnecessary using statement.
This commit is contained in:
Peter Ibekwe
2026-02-25 11:21:36 -08:00
committed by GitHub
Unverified
parent 2e26bb9387
commit de9d886aba
24 changed files with 2663 additions and 60 deletions
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dotnet/src/Microsoft.Agents.AI.Workflows.Declarative/ObjectModel/InvokeFunctionToolExecutor.cs
+1 -35
View File
@@ -204,7 +204,7 @@ internal sealed class InvokeFunctionToolExecutor(
object? parsedValue = jsonDocument.RootElement.ValueKind switch
{
JsonValueKind.Object => jsonDocument.ParseRecord(VariableType.RecordType),
JsonValueKind.Array => jsonDocument.ParseList(CreateListTypeFromJson(jsonDocument.RootElement)),
JsonValueKind.Array => jsonDocument.ParseList(jsonDocument.RootElement.GetListTypeFromJson()),
JsonValueKind.String => jsonDocument.RootElement.GetString(),
JsonValueKind.Number => jsonDocument.RootElement.TryGetInt64(out long l) ? l : jsonDocument.RootElement.GetDouble(),
JsonValueKind.True => true,
@@ -224,40 +224,6 @@ internal sealed class InvokeFunctionToolExecutor(
await this.AssignAsync(this.Model.Output.Result?.Path, resultValue.ToFormula(), context).ConfigureAwait(false);
}
/// <summary>
/// Creates a VariableType.List with schema inferred from the first object element in the array.
/// </summary>
private static VariableType CreateListTypeFromJson(JsonElement arrayElement)
{
// Find the first object element to infer schema
foreach (JsonElement element in arrayElement.EnumerateArray())
{
if (element.ValueKind == JsonValueKind.Object)
{
// Build schema from the object's properties
List<(string Key, VariableType Type)> fields = [];
foreach (JsonProperty property in element.EnumerateObject())
{
VariableType fieldType = property.Value.ValueKind switch
{
JsonValueKind.String => typeof(string),
JsonValueKind.Number => typeof(decimal),
JsonValueKind.True or JsonValueKind.False => typeof(bool),
JsonValueKind.Object => VariableType.RecordType,
JsonValueKind.Array => VariableType.ListType,
_ => typeof(string),
};
fields.Add((property.Name, fieldType));
}
return VariableType.List(fields);
}
}
// Fallback for arrays of primitives or empty arrays
return VariableType.ListType;
}
private string GetFunctionName() =>
this.Evaluator.GetValue(
Throw.IfNull(