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32 changes: 27 additions & 5 deletions src/ModelContextProtocol/Server/AIFunctionMcpServerTool.cs
Original file line number Diff line number Diff line change
Expand Up @@ -193,6 +193,30 @@ options.OpenWorld is not null ||
return newOptions;
}

private static CallToolResponse ConvertAiContentEnumerableToCallToolResponse(IEnumerable<AIContent> contentItems)
{
List<Content> contentList = [];
bool allErrorContent = true;
bool hasAny = false;

foreach (var item in contentItems)
{
contentList.Add(item.ToContent());
hasAny = true;

if (allErrorContent && item is not ErrorContent)
{
allErrorContent = false;
}
}

return new()
{
Content = contentList,
IsError = allErrorContent && hasAny
};
}

/// <summary>Gets the <see cref="AIFunction"/> wrapped by this tool.</summary>
internal AIFunction AIFunction { get; }

Expand Down Expand Up @@ -253,7 +277,8 @@ public override async ValueTask<CallToolResponse> InvokeAsync(
{
AIContent aiContent => new()
{
Content = [aiContent.ToContent()]
Content = [aiContent.ToContent()],
IsError = aiContent is ErrorContent
},

null => new()
Expand All @@ -276,10 +301,7 @@ public override async ValueTask<CallToolResponse> InvokeAsync(
Content = [.. texts.Select(x => new Content() { Type = "text", Text = x ?? string.Empty })]
},

IEnumerable<AIContent> contentItems => new()
{
Content = [.. contentItems.Select(static item => item.ToContent())]
},
IEnumerable<AIContent> contentItems => ConvertAiContentEnumerableToCallToolResponse(contentItems),

IEnumerable<Content> contents => new()
{
Expand Down